#!/bin/sh
# Tcl ignores the next line -*- tcl -*- \
exec wish "$0" -- "$@"

set appvers {@@GIT_VERSION@@}
set copyright {
Copyright © 2006, 2007 Shawn Pearce, Paul Mackerras.

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA}

######################################################################
##
## read only globals

set _appname [lindex [file split $argv0] end]
set _gitdir {}
set _reponame {}

proc appname {} {
	global _appname
	return $_appname
}

proc gitdir {args} {
	global _gitdir
	if {$args eq {}} {
		return $_gitdir
	}
	return [eval [concat [list file join $_gitdir] $args]]
}

proc reponame {} {
	global _reponame
	return $_reponame
}

######################################################################
##
## config

proc is_many_config {name} {
	switch -glob -- $name {
	remote.*.fetch -
	remote.*.push
		{return 1}
	*
		{return 0}
	}
}

proc load_config {include_global} {
	global repo_config global_config default_config

	array unset global_config
	if {$include_global} {
		catch {
			set fd_rc [open "| git repo-config --global --list" r]
			while {[gets $fd_rc line] >= 0} {
				if {[regexp {^([^=]+)=(.*)$} $line line name value]} {
					if {[is_many_config $name]} {
						lappend global_config($name) $value
					} else {
						set global_config($name) $value
					}
				}
			}
			close $fd_rc
		}
	}

	array unset repo_config
	catch {
		set fd_rc [open "| git repo-config --list" r]
		while {[gets $fd_rc line] >= 0} {
			if {[regexp {^([^=]+)=(.*)$} $line line name value]} {
				if {[is_many_config $name]} {
					lappend repo_config($name) $value
				} else {
					set repo_config($name) $value
				}
			}
		}
		close $fd_rc
	}

	foreach name [array names default_config] {
		if {[catch {set v $global_config($name)}]} {
			set global_config($name) $default_config($name)
		}
		if {[catch {set v $repo_config($name)}]} {
			set repo_config($name) $default_config($name)
		}
	}
}

proc save_config {} {
	global default_config font_descs
	global repo_config global_config
	global repo_config_new global_config_new

	foreach option $font_descs {
		set name [lindex $option 0]
		set font [lindex $option 1]
		font configure $font \
			-family $global_config_new(gui.$font^^family) \
			-size $global_config_new(gui.$font^^size)
		font configure ${font}bold \
			-family $global_config_new(gui.$font^^family) \
			-size $global_config_new(gui.$font^^size)
		set global_config_new(gui.$name) [font configure $font]
		unset global_config_new(gui.$font^^family)
		unset global_config_new(gui.$font^^size)
	}

	foreach name [array names default_config] {
		set value $global_config_new($name)
		if {$value ne $global_config($name)} {
			if {$value eq $default_config($name)} {
				catch {exec git repo-config --global --unset $name}
			} else {
				regsub -all "\[{}\]" $value {"} value
				exec git repo-config --global $name $value
			}
			set global_config($name) $value
			if {$value eq $repo_config($name)} {
				catch {exec git repo-config --unset $name}
				set repo_config($name) $value
			}
		}
	}

	foreach name [array names default_config] {
		set value $repo_config_new($name)
		if {$value ne $repo_config($name)} {
			if {$value eq $global_config($name)} {
				catch {exec git repo-config --unset $name}
			} else {
				regsub -all "\[{}\]" $value {"} value
				exec git repo-config $name $value
			}
			set repo_config($name) $value
		}
	}
}

proc error_popup {msg} {
	set title [appname]
	if {[reponame] ne {}} {
		append title " ([reponame])"
	}
	set cmd [list tk_messageBox \
		-icon error \
		-type ok \
		-title "$title: error" \
		-message $msg]
	if {[winfo ismapped .]} {
		lappend cmd -parent .
	}
	eval $cmd
}

proc warn_popup {msg} {
	set title [appname]
	if {[reponame] ne {}} {
		append title " ([reponame])"
	}
	set cmd [list tk_messageBox \
		-icon warning \
		-type ok \
		-title "$title: warning" \
		-message $msg]
	if {[winfo ismapped .]} {
		lappend cmd -parent .
	}
	eval $cmd
}

proc info_popup {msg} {
	set title [appname]
	if {[reponame] ne {}} {
		append title " ([reponame])"
	}
	tk_messageBox \
		-parent . \
		-icon info \
		-type ok \
		-title $title \
		-message $msg
}

proc ask_popup {msg} {
	set title [appname]
	if {[reponame] ne {}} {
		append title " ([reponame])"
	}
	return [tk_messageBox \
		-parent . \
		-icon question \
		-type yesno \
		-title $title \
		-message $msg]
}

######################################################################
##
## repository setup

if {   [catch {set _gitdir $env(GIT_DIR)}]
	&& [catch {set _gitdir [exec git rev-parse --git-dir]} err]} {
	catch {wm withdraw .}
	error_popup "Cannot find the git directory:\n\n$err"
	exit 1
}
if {![file isdirectory $_gitdir]} {
	catch {wm withdraw .}
	error_popup "Git directory not found:\n\n$_gitdir"
	exit 1
}
if {[lindex [file split $_gitdir] end] ne {.git}} {
	catch {wm withdraw .}
	error_popup "Cannot use funny .git directory:\n\n$gitdir"
	exit 1
}
if {[catch {cd [file dirname $_gitdir]} err]} {
	catch {wm withdraw .}
	error_popup "No working directory [file dirname $_gitdir]:\n\n$err"
	exit 1
}
set _reponame [lindex [file split \
	[file normalize [file dirname $_gitdir]]] \
	end]

set single_commit 0
if {[appname] eq {git-citool}} {
	set single_commit 1
}

######################################################################
##
## task management

set rescan_active 0
set diff_active 0
set last_clicked {}

set disable_on_lock [list]
set index_lock_type none

proc lock_index {type} {
	global index_lock_type disable_on_lock

	if {$index_lock_type eq {none}} {
		set index_lock_type $type
		foreach w $disable_on_lock {
			uplevel #0 $w disabled
		}
		return 1
	} elseif {$index_lock_type eq "begin-$type"} {
		set index_lock_type $type
		return 1
	}
	return 0
}

proc unlock_index {} {
	global index_lock_type disable_on_lock

	set index_lock_type none
	foreach w $disable_on_lock {
		uplevel #0 $w normal
	}
}

######################################################################
##
## status

proc repository_state {ctvar hdvar mhvar} {
	global current_branch
	upvar $ctvar ct $hdvar hd $mhvar mh

	set mh [list]

	if {[catch {set current_branch [exec git symbolic-ref HEAD]}]} {
		set current_branch {}
	} else {
		regsub ^refs/((heads|tags|remotes)/)? \
			$current_branch \
			{} \
			current_branch
	}

	if {[catch {set hd [exec git rev-parse --verify HEAD]}]} {
		set hd {}
		set ct initial
		return
	}

	set merge_head [gitdir MERGE_HEAD]
	if {[file exists $merge_head]} {
		set ct merge
		set fd_mh [open $merge_head r]
		while {[gets $fd_mh line] >= 0} {
			lappend mh $line
		}
		close $fd_mh
		return
	}

	set ct normal
}

proc PARENT {} {
	global PARENT empty_tree

	set p [lindex $PARENT 0]
	if {$p ne {}} {
		return $p
	}
	if {$empty_tree eq {}} {
		set empty_tree [exec git mktree << {}]
	}
	return $empty_tree
}

proc rescan {after {honor_trustmtime 1}} {
	global HEAD PARENT MERGE_HEAD commit_type
	global ui_index ui_workdir ui_status_value ui_comm
	global rescan_active file_states
	global repo_config

	if {$rescan_active > 0 || ![lock_index read]} return

	repository_state newType newHEAD newMERGE_HEAD
	if {[string match amend* $commit_type]
		&& $newType eq {normal}
		&& $newHEAD eq $HEAD} {
	} else {
		set HEAD $newHEAD
		set PARENT $newHEAD
		set MERGE_HEAD $newMERGE_HEAD
		set commit_type $newType
	}

	array unset file_states

	if {![$ui_comm edit modified]
		|| [string trim [$ui_comm get 0.0 end]] eq {}} {
		if {[load_message GITGUI_MSG]} {
		} elseif {[load_message MERGE_MSG]} {
		} elseif {[load_message SQUASH_MSG]} {
		}
		$ui_comm edit reset
		$ui_comm edit modified false
	}

	if {$honor_trustmtime && $repo_config(gui.trustmtime) eq {true}} {
		rescan_stage2 {} $after
	} else {
		set rescan_active 1
		set ui_status_value {Refreshing file status...}
		set cmd [list git update-index]
		lappend cmd -q
		lappend cmd --unmerged
		lappend cmd --ignore-missing
		lappend cmd --refresh
		set fd_rf [open "| $cmd" r]
		fconfigure $fd_rf -blocking 0 -translation binary
		fileevent $fd_rf readable \
			[list rescan_stage2 $fd_rf $after]
	}
}

proc rescan_stage2 {fd after} {
	global ui_status_value
	global rescan_active buf_rdi buf_rdf buf_rlo

	if {$fd ne {}} {
		read $fd
		if {![eof $fd]} return
		close $fd
	}

	set ls_others [list | git ls-files --others -z \
		--exclude-per-directory=.gitignore]
	set info_exclude [gitdir info exclude]
	if {[file readable $info_exclude]} {
		lappend ls_others "--exclude-from=$info_exclude"
	}

	set buf_rdi {}
	set buf_rdf {}
	set buf_rlo {}

	set rescan_active 3
	set ui_status_value {Scanning for modified files ...}
	set fd_di [open "| git diff-index --cached -z [PARENT]" r]
	set fd_df [open "| git diff-files -z" r]
	set fd_lo [open $ls_others r]

	fconfigure $fd_di -blocking 0 -translation binary
	fconfigure $fd_df -blocking 0 -translation binary
	fconfigure $fd_lo -blocking 0 -translation binary
	fileevent $fd_di readable [list read_diff_index $fd_di $after]
	fileevent $fd_df readable [list read_diff_files $fd_df $after]
	fileevent $fd_lo readable [list read_ls_others $fd_lo $after]
}

proc load_message {file} {
	global ui_comm

	set f [gitdir $file]
	if {[file isfile $f]} {
		if {[catch {set fd [open $f r]}]} {
			return 0
		}
		set content [string trim [read $fd]]
		close $fd
		$ui_comm delete 0.0 end
		$ui_comm insert end $content
		return 1
	}
	return 0
}

proc read_diff_index {fd after} {
	global buf_rdi

	append buf_rdi [read $fd]
	set c 0
	set n [string length $buf_rdi]
	while {$c < $n} {
		set z1 [string first "\0" $buf_rdi $c]
		if {$z1 == -1} break
		incr z1
		set z2 [string first "\0" $buf_rdi $z1]
		if {$z2 == -1} break

		incr c
		set i [split [string range $buf_rdi $c [expr {$z1 - 2}]] { }]
		merge_state \
			[string range $buf_rdi $z1 [expr {$z2 - 1}]] \
			[lindex $i 4]? \
			[list [lindex $i 0] [lindex $i 2]] \
			[list]
		set c $z2
		incr c
	}
	if {$c < $n} {
		set buf_rdi [string range $buf_rdi $c end]
	} else {
		set buf_rdi {}
	}

	rescan_done $fd buf_rdi $after
}

proc read_diff_files {fd after} {
	global buf_rdf

	append buf_rdf [read $fd]
	set c 0
	set n [string length $buf_rdf]
	while {$c < $n} {
		set z1 [string first "\0" $buf_rdf $c]
		if {$z1 == -1} break
		incr z1
		set z2 [string first "\0" $buf_rdf $z1]
		if {$z2 == -1} break

		incr c
		set i [split [string range $buf_rdf $c [expr {$z1 - 2}]] { }]
		merge_state \
			[string range $buf_rdf $z1 [expr {$z2 - 1}]] \
			?[lindex $i 4] \
			[list] \
			[list [lindex $i 0] [lindex $i 2]]
		set c $z2
		incr c
	}
	if {$c < $n} {
		set buf_rdf [string range $buf_rdf $c end]
	} else {
		set buf_rdf {}
	}

	rescan_done $fd buf_rdf $after
}

proc read_ls_others {fd after} {
	global buf_rlo

	append buf_rlo [read $fd]
	set pck [split $buf_rlo "\0"]
	set buf_rlo [lindex $pck end]
	foreach p [lrange $pck 0 end-1] {
		merge_state $p ?O
	}
	rescan_done $fd buf_rlo $after
}

proc rescan_done {fd buf after} {
	global rescan_active
	global file_states repo_config
	upvar $buf to_clear

	if {![eof $fd]} return
	set to_clear {}
	close $fd
	if {[incr rescan_active -1] > 0} return

	prune_selection
	unlock_index
	display_all_files
	reshow_diff
	uplevel #0 $after
}

proc prune_selection {} {
	global file_states selected_paths

	foreach path [array names selected_paths] {
		if {[catch {set still_here $file_states($path)}]} {
			unset selected_paths($path)
		}
	}
}

######################################################################
##
## diff

proc clear_diff {} {
	global ui_diff current_diff_path ui_index ui_workdir

	$ui_diff conf -state normal
	$ui_diff delete 0.0 end
	$ui_diff conf -state disabled

	set current_diff_path {}

	$ui_index tag remove in_diff 0.0 end
	$ui_workdir tag remove in_diff 0.0 end
}

proc reshow_diff {} {
	global ui_status_value file_states file_lists
	global current_diff_path current_diff_side

	set p $current_diff_path
	if {$p eq {}
		|| $current_diff_side eq {}
		|| [catch {set s $file_states($p)}]
		|| [lsearch -sorted $file_lists($current_diff_side) $p] == -1} {
		clear_diff
	} else {
		show_diff $p $current_diff_side
	}
}

proc handle_empty_diff {} {
	global current_diff_path file_states file_lists

	set path $current_diff_path
	set s $file_states($path)
	if {[lindex $s 0] ne {_M}} return

	info_popup "No differences detected.

[short_path $path] has no changes.

The modification date of this file was updated
by another application, but the content within
the file was not changed.

A rescan will be automatically started to find
other files which may have the same state."

	clear_diff
	display_file $path __
	rescan {set ui_status_value {Ready.}} 0
}

proc show_diff {path w {lno {}}} {
	global file_states file_lists
	global is_3way_diff diff_active repo_config
	global ui_diff ui_status_value ui_index ui_workdir
	global current_diff_path current_diff_side

	if {$diff_active || ![lock_index read]} return

	clear_diff
	if {$w eq {} || $lno == {}} {
		foreach w [array names file_lists] {
			set lno [lsearch -sorted $file_lists($w) $path]
			if {$lno >= 0} {
				incr lno
				break
			}
		}
	}
	if {$w ne {} && $lno >= 1} {
		$w tag add in_diff $lno.0 [expr {$lno + 1}].0
	}

	set s $file_states($path)
	set m [lindex $s 0]
	set is_3way_diff 0
	set diff_active 1
	set current_diff_path $path
	set current_diff_side $w
	set ui_status_value "Loading diff of [escape_path $path]..."

	# - Git won't give us the diff, there's nothing to compare to!
	#
	if {$m eq {_O}} {
		if {[catch {
				set fd [open $path r]
				set content [read $fd]
				close $fd
			} err ]} {
			set diff_active 0
			unlock_index
			set ui_status_value "Unable to display [escape_path $path]"
			error_popup "Error loading file:\n\n$err"
			return
		}
		if {[string first "\0" [string range $content 0 8000]] != -1} {
			set content {* Binary file (not showing content).}
		}
		$ui_diff conf -state normal
		$ui_diff insert end $content
		$ui_diff conf -state disabled
		set diff_active 0
		unlock_index
		set ui_status_value {Ready.}
		return
	}

	set cmd [list | git]
	if {$w eq $ui_index} {
		lappend cmd diff-index
		lappend cmd --cached
	} elseif {$w eq $ui_workdir} {
		if {[string index $m 0] eq {U}} {
			lappend cmd diff
		} else {
			lappend cmd diff-files
		}
	}

	lappend cmd -p
	lappend cmd --no-color
	if {$repo_config(gui.diffcontext) > 0} {
		lappend cmd "-U$repo_config(gui.diffcontext)"
	}
	if {$w eq $ui_index} {
		lappend cmd [PARENT]
	}
	lappend cmd --
	lappend cmd $path

	if {[catch {set fd [open $cmd r]} err]} {
		set diff_active 0
		unlock_index
		set ui_status_value "Unable to display [escape_path $path]"
		error_popup "Error loading diff:\n\n$err"
		return
	}

	fconfigure $fd -blocking 0 -translation auto
	fileevent $fd readable [list read_diff $fd]
}

proc read_diff {fd} {
	global ui_diff ui_status_value is_3way_diff diff_active

	$ui_diff conf -state normal
	while {[gets $fd line] >= 0} {
		# -- Cleanup uninteresting diff header lines.
		#
		if {[string match {diff --git *}      $line]} continue
		if {[string match {diff --cc *}       $line]} continue
		if {[string match {diff --combined *} $line]} continue
		if {[string match {--- *}             $line]} continue
		if {[string match {+++ *}             $line]} continue
		if {$line eq {deleted file mode 120000}} {
			set line "deleted symlink"
		}

		# -- Automatically detect if this is a 3 way diff.
		#
		if {[string match {@@@ *} $line]} {set is_3way_diff 1}

		if {[string match {index *} $line]
			|| [string match {mode *} $line]
			|| [string match {new file *} $line]
			|| [string match {deleted file *} $line]
			|| $line eq {\ No newline at end of file}
			|| [regexp {^\* Unmerged path } $line]} {
			set tags {}
		} elseif {$is_3way_diff} {
			set op [string range $line 0 1]
			switch -- $op {
			{  } {set tags {}}
			{@@} {set tags d_@}
			{ +} {set tags d_s+}
			{ -} {set tags d_s-}
			{+ } {set tags d_+s}
			{- } {set tags d_-s}
			{--} {set tags d_--}
			{++} {
				if {[regexp {^\+\+([<>]{7} |={7})} $line _g op]} {
					set line [string replace $line 0 1 {  }]
					set tags d$op
				} else {
					set tags d_++
				}
			}
			default {
				puts "error: Unhandled 3 way diff marker: {$op}"
				set tags {}
			}
			}
		} else {
			set op [string index $line 0]
			switch -- $op {
			{ } {set tags {}}
			{@} {set tags d_@}
			{-} {set tags d_-}
			{+} {
				if {[regexp {^\+([<>]{7} |={7})} $line _g op]} {
					set line [string replace $line 0 0 { }]
					set tags d$op
				} else {
					set tags d_+
				}
			}
			default {
				puts "error: Unhandled 2 way diff marker: {$op}"
				set tags {}
			}
			}
		}
		$ui_diff insert end $line $tags
		$ui_diff insert end "\n" $tags
	}
	$ui_diff conf -state disabled

	if {[eof $fd]} {
		close $fd
		set diff_active 0
		unlock_index
		set ui_status_value {Ready.}

		if {[$ui_diff index end] eq {2.0}} {
			handle_empty_diff
		}
	}
}

######################################################################
##
## commit

proc load_last_commit {} {
	global HEAD PARENT MERGE_HEAD commit_type ui_comm

	if {[llength $PARENT] == 0} {
		error_popup {There is nothing to amend.

You are about to create the initial commit.
There is no commit before this to amend.
}
		return
	}

	repository_state curType curHEAD curMERGE_HEAD
	if {$curType eq {merge}} {
		error_popup {Cannot amend while merging.

You are currently in the middle of a merge that
has not been fully completed.  You cannot amend
the prior commit unless you first abort the
current merge activity.
}
		return
	}

	set msg {}
	set parents [list]
	if {[catch {
			set fd [open "| git cat-file commit $curHEAD" r]
			while {[gets $fd line] > 0} {
				if {[string match {parent *} $line]} {
					lappend parents [string range $line 7 end]
				}
			}
			set msg [string trim [read $fd]]
			close $fd
		} err]} {
		error_popup "Error loading commit data for amend:\n\n$err"
		return
	}

	set HEAD $curHEAD
	set PARENT $parents
	set MERGE_HEAD [list]
	switch -- [llength $parents] {
	0       {set commit_type amend-initial}
	1       {set commit_type amend}
	default {set commit_type amend-merge}
	}

	$ui_comm delete 0.0 end
	$ui_comm insert end $msg
	$ui_comm edit reset
	$ui_comm edit modified false
	rescan {set ui_status_value {Ready.}}
}

proc create_new_commit {} {
	global commit_type ui_comm

	set commit_type normal
	$ui_comm delete 0.0 end
	$ui_comm edit reset
	$ui_comm edit modified false
	rescan {set ui_status_value {Ready.}}
}

set GIT_COMMITTER_IDENT {}

proc committer_ident {} {
	global GIT_COMMITTER_IDENT

	if {$GIT_COMMITTER_IDENT eq {}} {
		if {[catch {set me [exec git var GIT_COMMITTER_IDENT]} err]} {
			error_popup "Unable to obtain your identity:\n\n$err"
			return {}
		}
		if {![regexp {^(.*) [0-9]+ [-+0-9]+$} \
			$me me GIT_COMMITTER_IDENT]} {
			error_popup "Invalid GIT_COMMITTER_IDENT:\n\n$me"
			return {}
		}
	}

	return $GIT_COMMITTER_IDENT
}

proc commit_tree {} {
	global HEAD commit_type file_states ui_comm repo_config
	global ui_status_value pch_error

	if {![lock_index update]} return
	if {[committer_ident] eq {}} return

	# -- Our in memory state should match the repository.
	#
	repository_state curType curHEAD curMERGE_HEAD
	if {[string match amend* $commit_type]
		&& $curType eq {normal}
		&& $curHEAD eq $HEAD} {
	} elseif {$commit_type ne $curType || $HEAD ne $curHEAD} {
		info_popup {Last scanned state does not match repository state.

Another Git program has modified this repository
since the last scan.  A rescan must be performed
before another commit can be created.

The rescan will be automatically started now.
}
		unlock_index
		rescan {set ui_status_value {Ready.}}
		return
	}

	# -- At least one file should differ in the index.
	#
	set files_ready 0
	foreach path [array names file_states] {
		switch -glob -- [lindex $file_states($path) 0] {
		_? {continue}
		A? -
		D? -
		M? {set files_ready 1}
		U? {
			error_popup "Unmerged files cannot be committed.

File [short_path $path] has merge conflicts.
You must resolve them and add the file before committing.
"
			unlock_index
			return
		}
		default {
			error_popup "Unknown file state [lindex $s 0] detected.

File [short_path $path] cannot be committed by this program.
"
		}
		}
	}
	if {!$files_ready} {
		info_popup {No changes to commit.

You must add at least 1 file before you can commit.
}
		unlock_index
		return
	}

	# -- A message is required.
	#
	set msg [string trim [$ui_comm get 1.0 end]]
	if {$msg eq {}} {
		error_popup {Please supply a commit message.

A good commit message has the following format:

- First line: Describe in one sentance what you did.
- Second line: Blank
- Remaining lines: Describe why this change is good.
}
		unlock_index
		return
	}

	# -- Run the pre-commit hook.
	#
	set pchook [gitdir hooks pre-commit]

	# On Cygwin [file executable] might lie so we need to ask
	# the shell if the hook is executable.  Yes that's annoying.
	#
	if {[is_Windows] && [file isfile $pchook]} {
		set pchook [list sh -c [concat \
			"if test -x \"$pchook\";" \
			"then exec \"$pchook\" 2>&1;" \
			"fi"]]
	} elseif {[file executable $pchook]} {
		set pchook [list $pchook |& cat]
	} else {
		commit_writetree $curHEAD $msg
		return
	}

	set ui_status_value {Calling pre-commit hook...}
	set pch_error {}
	set fd_ph [open "| $pchook" r]
	fconfigure $fd_ph -blocking 0 -translation binary
	fileevent $fd_ph readable \
		[list commit_prehook_wait $fd_ph $curHEAD $msg]
}

proc commit_prehook_wait {fd_ph curHEAD msg} {
	global pch_error ui_status_value

	append pch_error [read $fd_ph]
	fconfigure $fd_ph -blocking 1
	if {[eof $fd_ph]} {
		if {[catch {close $fd_ph}]} {
			set ui_status_value {Commit declined by pre-commit hook.}
			hook_failed_popup pre-commit $pch_error
			unlock_index
		} else {
			commit_writetree $curHEAD $msg
		}
		set pch_error {}
		return
	}
	fconfigure $fd_ph -blocking 0
}

proc commit_writetree {curHEAD msg} {
	global ui_status_value

	set ui_status_value {Committing changes...}
	set fd_wt [open "| git write-tree" r]
	fileevent $fd_wt readable \
		[list commit_committree $fd_wt $curHEAD $msg]
}

proc commit_committree {fd_wt curHEAD msg} {
	global HEAD PARENT MERGE_HEAD commit_type
	global single_commit all_heads current_branch
	global ui_status_value ui_comm selected_commit_type
	global file_states selected_paths rescan_active

	gets $fd_wt tree_id
	if {$tree_id eq {} || [catch {close $fd_wt} err]} {
		error_popup "write-tree failed:\n\n$err"
		set ui_status_value {Commit failed.}
		unlock_index
		return
	}

	# -- Create the commit.
	#
	set cmd [list git commit-tree $tree_id]
	set parents [concat $PARENT $MERGE_HEAD]
	if {[llength $parents] > 0} {
		foreach p $parents {
			lappend cmd -p $p
		}
	} else {
		# git commit-tree writes to stderr during initial commit.
		lappend cmd 2>/dev/null
	}
	lappend cmd << $msg
	if {[catch {set cmt_id [eval exec $cmd]} err]} {
		error_popup "commit-tree failed:\n\n$err"
		set ui_status_value {Commit failed.}
		unlock_index
		return
	}

	# -- Update the HEAD ref.
	#
	set reflogm commit
	if {$commit_type ne {normal}} {
		append reflogm " ($commit_type)"
	}
	set i [string first "\n" $msg]
	if {$i >= 0} {
		append reflogm {: } [string range $msg 0 [expr {$i - 1}]]
	} else {
		append reflogm {: } $msg
	}
	set cmd [list git update-ref -m $reflogm HEAD $cmt_id $curHEAD]
	if {[catch {eval exec $cmd} err]} {
		error_popup "update-ref failed:\n\n$err"
		set ui_status_value {Commit failed.}
		unlock_index
		return
	}

	# -- Make sure our current branch exists.
	#
	if {$commit_type eq {initial}} {
		lappend all_heads $current_branch
		set all_heads [lsort -unique $all_heads]
		populate_branch_menu
	}

	# -- Cleanup after ourselves.
	#
	catch {file delete [gitdir MERGE_HEAD]}
	catch {file delete [gitdir MERGE_MSG]}
	catch {file delete [gitdir SQUASH_MSG]}
	catch {file delete [gitdir GITGUI_MSG]}

	# -- Let rerere do its thing.
	#
	if {[file isdirectory [gitdir rr-cache]]} {
		catch {exec git rerere}
	}

	# -- Run the post-commit hook.
	#
	set pchook [gitdir hooks post-commit]
	if {[is_Windows] && [file isfile $pchook]} {
		set pchook [list sh -c [concat \
			"if test -x \"$pchook\";" \
			"then exec \"$pchook\";" \
			"fi"]]
	} elseif {![file executable $pchook]} {
		set pchook {}
	}
	if {$pchook ne {}} {
		catch {exec $pchook &}
	}

	$ui_comm delete 0.0 end
	$ui_comm edit reset
	$ui_comm edit modified false

	if {$single_commit} do_quit

	# -- Update in memory status
	#
	set selected_commit_type new
	set commit_type normal
	set HEAD $cmt_id
	set PARENT $cmt_id
	set MERGE_HEAD [list]

	foreach path [array names file_states] {
		set s $file_states($path)
		set m [lindex $s 0]
		switch -glob -- $m {
		_O -
		_M -
		_D {continue}
		__ -
		A_ -
		M_ -
		D_ {
			unset file_states($path)
			catch {unset selected_paths($path)}
		}
		DO {
			set file_states($path) [list _O [lindex $s 1] {} {}]
		}
		AM -
		AD -
		MM -
		MD {
			set file_states($path) [list \
				_[string index $m 1] \
				[lindex $s 1] \
				[lindex $s 3] \
				{}]
		}
		}
	}

	display_all_files
	unlock_index
	reshow_diff
	set ui_status_value \
		"Changes committed as [string range $cmt_id 0 7]."
}

######################################################################
##
## fetch pull push

proc fetch_from {remote} {
	set w [new_console "fetch $remote" \
		"Fetching new changes from $remote"]
	set cmd [list git fetch]
	lappend cmd $remote
	console_exec $w $cmd
}

proc pull_remote {remote branch} {
	global HEAD commit_type file_states repo_config

	if {![lock_index update]} return

	# -- Our in memory state should match the repository.
	#
	repository_state curType curHEAD curMERGE_HEAD
	if {$commit_type ne $curType || $HEAD ne $curHEAD} {
		info_popup {Last scanned state does not match repository state.

Another Git program has modified this repository
since the last scan.  A rescan must be performed
before a pull operation can be started.

The rescan will be automatically started now.
}
		unlock_index
		rescan {set ui_status_value {Ready.}}
		return
	}

	# -- No differences should exist before a pull.
	#
	if {[array size file_states] != 0} {
		error_popup {Uncommitted but modified files are present.

You should not perform a pull with unmodified
files in your working directory as Git will be
unable to recover from an incorrect merge.

You should commit or revert all changes before
starting a pull operation.
}
		unlock_index
		return
	}

	set w [new_console "pull $remote $branch" \
		"Pulling new changes from branch $branch in $remote"]
	set cmd [list git pull]
	if {$repo_config(gui.pullsummary) eq {false}} {
		lappend cmd --no-summary
	}
	lappend cmd $remote
	lappend cmd $branch
	console_exec $w $cmd [list post_pull_remote $remote $branch]
}

proc post_pull_remote {remote branch success} {
	global HEAD PARENT MERGE_HEAD commit_type selected_commit_type
	global ui_status_value

	unlock_index
	if {$success} {
		repository_state commit_type HEAD MERGE_HEAD
		set PARENT $HEAD
		set selected_commit_type new
		set ui_status_value "Pulling $branch from $remote complete."
	} else {
		rescan [list set ui_status_value \
			"Conflicts detected while pulling $branch from $remote."]
	}
}

proc push_to {remote} {
	set w [new_console "push $remote" \
		"Pushing changes to $remote"]
	set cmd [list git push]
	lappend cmd $remote
	console_exec $w $cmd
}

######################################################################
##
## ui helpers

proc mapicon {w state path} {
	global all_icons

	if {[catch {set r $all_icons($state$w)}]} {
		puts "error: no icon for $w state={$state} $path"
		return file_plain
	}
	return $r
}

proc mapdesc {state path} {
	global all_descs

	if {[catch {set r $all_descs($state)}]} {
		puts "error: no desc for state={$state} $path"
		return $state
	}
	return $r
}

proc escape_path {path} {
	regsub -all "\n" $path "\\n" path
	return $path
}

proc short_path {path} {
	return [escape_path [lindex [file split $path] end]]
}

set next_icon_id 0
set null_sha1 [string repeat 0 40]

proc merge_state {path new_state {head_info {}} {index_info {}}} {
	global file_states next_icon_id null_sha1

	set s0 [string index $new_state 0]
	set s1 [string index $new_state 1]

	if {[catch {set info $file_states($path)}]} {
		set state __
		set icon n[incr next_icon_id]
	} else {
		set state [lindex $info 0]
		set icon [lindex $info 1]
		if {$head_info eq {}}  {set head_info  [lindex $info 2]}
		if {$index_info eq {}} {set index_info [lindex $info 3]}
	}

	if     {$s0 eq {?}} {set s0 [string index $state 0]} \
	elseif {$s0 eq {_}} {set s0 _}

	if     {$s1 eq {?}} {set s1 [string index $state 1]} \
	elseif {$s1 eq {_}} {set s1 _}

	if {$s0 eq {A} && $s1 eq {_} && $head_info eq {}} {
		set head_info [list 0 $null_sha1]
	} elseif {$s0 ne {_} && [string index $state 0] eq {_}
		&& $head_info eq {}} {
		set head_info $index_info
	}

	set file_states($path) [list $s0$s1 $icon \
		$head_info $index_info \
		]
	return $state
}

proc display_file_helper {w path icon_name old_m new_m} {
	global file_lists

	if {$new_m eq {_}} {
		set lno [lsearch -sorted $file_lists($w) $path]
		if {$lno >= 0} {
			set file_lists($w) [lreplace $file_lists($w) $lno $lno]
			incr lno
			$w conf -state normal
			$w delete $lno.0 [expr {$lno + 1}].0
			$w conf -state disabled
		}
	} elseif {$old_m eq {_} && $new_m ne {_}} {
		lappend file_lists($w) $path
		set file_lists($w) [lsort -unique $file_lists($w)]
		set lno [lsearch -sorted $file_lists($w) $path]
		incr lno
		$w conf -state normal
		$w image create $lno.0 \
			-align center -padx 5 -pady 1 \
			-name $icon_name \
			-image [mapicon $w $new_m $path]
		$w insert $lno.1 "[escape_path $path]\n"
		$w conf -state disabled
	} elseif {$old_m ne $new_m} {
		$w conf -state normal
		$w image conf $icon_name -image [mapicon $w $new_m $path]
		$w conf -state disabled
	}
}

proc display_file {path state} {
	global file_states selected_paths
	global ui_index ui_workdir

	set old_m [merge_state $path $state]
	set s $file_states($path)
	set new_m [lindex $s 0]
	set icon_name [lindex $s 1]

	set o [string index $old_m 0]
	set n [string index $new_m 0]
	if {$o eq {U}} {
		set o _
	}
	if {$n eq {U}} {
		set n _
	}
	display_file_helper	$ui_index $path $icon_name $o $n

	if {[string index $old_m 0] eq {U}} {
		set o U
	} else {
		set o [string index $old_m 1]
	}
	if {[string index $new_m 0] eq {U}} {
		set n U
	} else {
		set n [string index $new_m 1]
	}
	display_file_helper	$ui_workdir $path $icon_name $o $n

	if {$new_m eq {__}} {
		unset file_states($path)
		catch {unset selected_paths($path)}
	}
}

proc display_all_files_helper {w path icon_name m} {
	global file_lists

	lappend file_lists($w) $path
	set lno [expr {[lindex [split [$w index end] .] 0] - 1}]
	$w image create end \
		-align center -padx 5 -pady 1 \
		-name $icon_name \
		-image [mapicon $w $m $path]
	$w insert end "[escape_path $path]\n"
}

proc display_all_files {} {
	global ui_index ui_workdir
	global file_states file_lists
	global last_clicked

	$ui_index conf -state normal
	$ui_workdir conf -state normal

	$ui_index delete 0.0 end
	$ui_workdir delete 0.0 end
	set last_clicked {}

	set file_lists($ui_index) [list]
	set file_lists($ui_workdir) [list]

	foreach path [lsort [array names file_states]] {
		set s $file_states($path)
		set m [lindex $s 0]
		set icon_name [lindex $s 1]

		set s [string index $m 0]
		if {$s ne {U} && $s ne {_}} {
			display_all_files_helper $ui_index $path \
				$icon_name $s
		}

		if {[string index $m 0] eq {U}} {
			set s U
		} else {
			set s [string index $m 1]
		}
		if {$s ne {_}} {
			display_all_files_helper $ui_workdir $path \
				$icon_name $s
		}
	}

	$ui_index conf -state disabled
	$ui_workdir conf -state disabled
}

proc update_indexinfo {msg pathList after} {
	global update_index_cp ui_status_value

	if {![lock_index update]} return

	set update_index_cp 0
	set pathList [lsort $pathList]
	set totalCnt [llength $pathList]
	set batch [expr {int($totalCnt * .01) + 1}]
	if {$batch > 25} {set batch 25}

	set ui_status_value [format \
		"$msg... %i/%i files (%.2f%%)" \
		$update_index_cp \
		$totalCnt \
		0.0]
	set fd [open "| git update-index -z --index-info" w]
	fconfigure $fd \
		-blocking 0 \
		-buffering full \
		-buffersize 512 \
		-translation binary
	fileevent $fd writable [list \
		write_update_indexinfo \
		$fd \
		$pathList \
		$totalCnt \
		$batch \
		$msg \
		$after \
		]
}

proc write_update_indexinfo {fd pathList totalCnt batch msg after} {
	global update_index_cp ui_status_value
	global file_states current_diff_path

	if {$update_index_cp >= $totalCnt} {
		close $fd
		unlock_index
		uplevel #0 $after
		return
	}

	for {set i $batch} \
		{$update_index_cp < $totalCnt && $i > 0} \
		{incr i -1} {
		set path [lindex $pathList $update_index_cp]
		incr update_index_cp

		set s $file_states($path)
		switch -glob -- [lindex $s 0] {
		A? {set new _O}
		M? {set new _M}
		D_ {set new _D}
		D? {set new _?}
		?? {continue}
		}
		set info [lindex $s 2]
		if {$info eq {}} continue

		puts -nonewline $fd "$info\t$path\0"
		display_file $path $new
	}

	set ui_status_value [format \
		"$msg... %i/%i files (%.2f%%)" \
		$update_index_cp \
		$totalCnt \
		[expr {100.0 * $update_index_cp / $totalCnt}]]
}

proc update_index {msg pathList after} {
	global update_index_cp ui_status_value

	if {![lock_index update]} return

	set update_index_cp 0
	set pathList [lsort $pathList]
	set totalCnt [llength $pathList]
	set batch [expr {int($totalCnt * .01) + 1}]
	if {$batch > 25} {set batch 25}

	set ui_status_value [format \
		"$msg... %i/%i files (%.2f%%)" \
		$update_index_cp \
		$totalCnt \
		0.0]
	set fd [open "| git update-index --add --remove -z --stdin" w]
	fconfigure $fd \
		-blocking 0 \
		-buffering full \
		-buffersize 512 \
		-translation binary
	fileevent $fd writable [list \
		write_update_index \
		$fd \
		$pathList \
		$totalCnt \
		$batch \
		$msg \
		$after \
		]
}

proc write_update_index {fd pathList totalCnt batch msg after} {
	global update_index_cp ui_status_value
	global file_states current_diff_path

	if {$update_index_cp >= $totalCnt} {
		close $fd
		unlock_index
		uplevel #0 $after
		return
	}

	for {set i $batch} \
		{$update_index_cp < $totalCnt && $i > 0} \
		{incr i -1} {
		set path [lindex $pathList $update_index_cp]
		incr update_index_cp

		switch -glob -- [lindex $file_states($path) 0] {
		AD {set new __}
		?D {set new D_}
		_O -
		AM {set new A_}
		U? {
			if {[file exists $path]} {
				set new M_
			} else {
				set new D_
			}
		}
		?M {set new M_}
		?? {continue}
		}
		puts -nonewline $fd "$path\0"
		display_file $path $new
	}

	set ui_status_value [format \
		"$msg... %i/%i files (%.2f%%)" \
		$update_index_cp \
		$totalCnt \
		[expr {100.0 * $update_index_cp / $totalCnt}]]
}

proc checkout_index {msg pathList after} {
	global update_index_cp ui_status_value

	if {![lock_index update]} return

	set update_index_cp 0
	set pathList [lsort $pathList]
	set totalCnt [llength $pathList]
	set batch [expr {int($totalCnt * .01) + 1}]
	if {$batch > 25} {set batch 25}

	set ui_status_value [format \
		"$msg... %i/%i files (%.2f%%)" \
		$update_index_cp \
		$totalCnt \
		0.0]
	set cmd [list git checkout-index]
	lappend cmd --index
	lappend cmd --quiet
	lappend cmd --force
	lappend cmd -z
	lappend cmd --stdin
	set fd [open "| $cmd " w]
	fconfigure $fd \
		-blocking 0 \
		-buffering full \
		-buffersize 512 \
		-translation binary
	fileevent $fd writable [list \
		write_checkout_index \
		$fd \
		$pathList \
		$totalCnt \
		$batch \
		$msg \
		$after \
		]
}

proc write_checkout_index {fd pathList totalCnt batch msg after} {
	global update_index_cp ui_status_value
	global file_states current_diff_path

	if {$update_index_cp >= $totalCnt} {
		close $fd
		unlock_index
		uplevel #0 $after
		return
	}

	for {set i $batch} \
		{$update_index_cp < $totalCnt && $i > 0} \
		{incr i -1} {
		set path [lindex $pathList $update_index_cp]
		incr update_index_cp
		switch -glob -- [lindex $file_states($path) 0] {
		U? {continue}
		?M -
		?D {
			puts -nonewline $fd "$path\0"
			display_file $path ?_
		}
		}
	}

	set ui_status_value [format \
		"$msg... %i/%i files (%.2f%%)" \
		$update_index_cp \
		$totalCnt \
		[expr {100.0 * $update_index_cp / $totalCnt}]]
}

######################################################################
##
## branch management

proc is_tracking_branch {name} {
	global tracking_branches

	if {![catch {set info $tracking_branches($name)}]} {
		return 1
	}
	foreach t [array names tracking_branches] {
		if {[string match {*/\*} $t] && [string match $t $name]} {
			return 1
		}
	}
	return 0
}

proc load_all_heads {} {
	global all_heads

	set all_heads [list]
	set fd [open "| git for-each-ref --format=%(refname) refs/heads" r]
	while {[gets $fd line] > 0} {
		if {[is_tracking_branch $line]} continue
		if {![regsub ^refs/heads/ $line {} name]} continue
		lappend all_heads $name
	}
	close $fd

	set all_heads [lsort $all_heads]
}

proc populate_branch_menu {} {
	global all_heads disable_on_lock

	set m .mbar.branch
	set last [$m index last]
	for {set i 0} {$i <= $last} {incr i} {
		if {[$m type $i] eq {separator}} {
			$m delete $i last
			set new_dol [list]
			foreach a $disable_on_lock {
				if {[lindex $a 0] ne $m || [lindex $a 2] < $i} {
					lappend new_dol $a
				}
			}
			set disable_on_lock $new_dol
			break
		}
	}

	$m add separator
	foreach b $all_heads {
		$m add radiobutton \
			-label $b \
			-command [list switch_branch $b] \
			-variable current_branch \
			-value $b \
			-font font_ui
		lappend disable_on_lock \
			[list $m entryconf [$m index last] -state]
	}
}

proc all_tracking_branches {} {
	global tracking_branches

	set all_trackings {}
	set cmd {}
	foreach name [array names tracking_branches] {
		if {[regsub {/\*$} $name {} name]} {
			lappend cmd $name
		} else {
			regsub ^refs/(heads|remotes)/ $name {} name
			lappend all_trackings $name
		}
	}

	if {$cmd ne {}} {
		set fd [open "| git for-each-ref --format=%(refname) $cmd" r]
		while {[gets $fd name] > 0} {
			regsub ^refs/(heads|remotes)/ $name {} name
			lappend all_trackings $name
		}
		close $fd
	}

	return [lsort -unique $all_trackings]
}

proc do_create_branch_action {w} {
	global all_heads null_sha1 repo_config
	global create_branch_checkout create_branch_revtype
	global create_branch_head create_branch_trackinghead

	set newbranch [string trim [$w.desc.name_t get 0.0 end]]
	if {$newbranch eq {}
		|| $newbranch eq $repo_config(gui.newbranchtemplate)} {
		tk_messageBox \
			-icon error \
			-type ok \
			-title [wm title $w] \
			-parent $w \
			-message "Please supply a branch name."
		focus $w.desc.name_t
		return
	}
	if {![catch {exec git show-ref --verify -- "refs/heads/$newbranch"}]} {
		tk_messageBox \
			-icon error \
			-type ok \
			-title [wm title $w] \
			-parent $w \
			-message "Branch '$newbranch' already exists."
		focus $w.desc.name_t
		return
	}
	if {[catch {exec git check-ref-format "heads/$newbranch"}]} {
		tk_messageBox \
			-icon error \
			-type ok \
			-title [wm title $w] \
			-parent $w \
			-message "We do not like '$newbranch' as a branch name."
		focus $w.desc.name_t
		return
	}

	set rev {}
	switch -- $create_branch_revtype {
	head {set rev $create_branch_head}
	tracking {set rev $create_branch_trackinghead}
	expression {set rev [string trim [$w.from.exp_t get 0.0 end]]}
	}
	if {[catch {set cmt [exec git rev-parse --verify "${rev}^0"]}]} {
		tk_messageBox \
			-icon error \
			-type ok \
			-title [wm title $w] \
			-parent $w \
			-message "Invalid starting revision: $rev"
		return
	}
	set cmd [list git update-ref]
	lappend cmd -m
	lappend cmd "branch: Created from $rev"
	lappend cmd "refs/heads/$newbranch"
	lappend cmd $cmt
	lappend cmd $null_sha1
	if {[catch {eval exec $cmd} err]} {
		tk_messageBox \
			-icon error \
			-type ok \
			-title [wm title $w] \
			-parent $w \
			-message "Failed to create '$newbranch'.\n\n$err"
		return
	}

	lappend all_heads $newbranch
	set all_heads [lsort $all_heads]
	populate_branch_menu
	destroy $w
	if {$create_branch_checkout} {
		switch_branch $newbranch
	}
}

proc radio_selector {varname value args} {
	upvar #0 $varname var
	set var $value
}

trace add variable create_branch_head write \
	[list radio_selector create_branch_revtype head]
trace add variable create_branch_trackinghead write \
	[list radio_selector create_branch_revtype tracking]

trace add variable delete_branch_head write \
	[list radio_selector delete_branch_checktype head]
trace add variable delete_branch_trackinghead write \
	[list radio_selector delete_branch_checktype tracking]

proc do_create_branch {} {
	global all_heads current_branch repo_config
	global create_branch_checkout create_branch_revtype
	global create_branch_head create_branch_trackinghead

	set w .branch_editor
	toplevel $w
	wm geometry $w "+[winfo rootx .]+[winfo rooty .]"

	label $w.header -text {Create New Branch} \
		-font font_uibold
	pack $w.header -side top -fill x

	frame $w.buttons
	button $w.buttons.create -text Create \
		-font font_ui \
		-default active \
		-command [list do_create_branch_action $w]
	pack $w.buttons.create -side right
	button $w.buttons.cancel -text {Cancel} \
		-font font_ui \
		-command [list destroy $w]
	pack $w.buttons.cancel -side right -padx 5
	pack $w.buttons -side bottom -fill x -pady 10 -padx 10

	labelframe $w.desc \
		-text {Branch Description} \
		-font font_ui
	label $w.desc.name_l -text {Name:} -font font_ui
	text $w.desc.name_t \
		-borderwidth 1 \
		-relief sunken \
		-height 1 \
		-width 40 \
		-font font_ui
	$w.desc.name_t insert 0.0 $repo_config(gui.newbranchtemplate)
	grid $w.desc.name_l $w.desc.name_t -stick we -padx {0 5}
	bind $w.desc.name_t <Shift-Key-Tab> {focus [tk_focusPrev %W];break}
	bind $w.desc.name_t <Key-Tab> {focus [tk_focusNext %W];break}
	bind $w.desc.name_t <Key-Return> "do_create_branch_action $w;break"
	bind $w.desc.name_t <Key> {
		if {{%K} ne {BackSpace}
			&& {%K} ne {Tab}
			&& {%K} ne {Escape}
			&& {%K} ne {Return}} {
			if {%k <= 32} break
			if {[string first %A {~^:?*[}] >= 0} break
		}
	}
	grid columnconfigure $w.desc 1 -weight 1
	pack $w.desc -anchor nw -fill x -pady 5 -padx 5

	labelframe $w.from \
		-text {Starting Revision} \
		-font font_ui
	radiobutton $w.from.head_r \
		-text {Local Branch:} \
		-value head \
		-variable create_branch_revtype \
		-font font_ui
	eval tk_optionMenu $w.from.head_m create_branch_head $all_heads
	grid $w.from.head_r $w.from.head_m -sticky w
	set all_trackings [all_tracking_branches]
	if {$all_trackings ne {}} {
		set create_branch_trackinghead [lindex $all_trackings 0]
		radiobutton $w.from.tracking_r \
			-text {Tracking Branch:} \
			-value tracking \
			-variable create_branch_revtype \
			-font font_ui
		eval tk_optionMenu $w.from.tracking_m \
			create_branch_trackinghead \
			$all_trackings
		grid $w.from.tracking_r $w.from.tracking_m -sticky w
	}
	radiobutton $w.from.exp_r \
		-text {Revision Expression:} \
		-value expression \
		-variable create_branch_revtype \
		-font font_ui
	text $w.from.exp_t \
		-borderwidth 1 \
		-relief sunken \
		-height 1 \
		-width 50 \
		-font font_ui
	grid $w.from.exp_r $w.from.exp_t -stick we -padx {0 5}
	bind $w.from.exp_t <Shift-Key-Tab> {focus [tk_focusPrev %W];break}
	bind $w.from.exp_t <Key-Tab> {focus [tk_focusNext %W];break}
	bind $w.from.exp_t <Key-Return> "do_create_branch_action $w;break"
	bind $w.from.exp_t <Key-space> break
	bind $w.from.exp_t <Key> {set create_branch_revtype expression}
	grid columnconfigure $w.from 1 -weight 1
	pack $w.from -anchor nw -fill x -pady 5 -padx 5

	labelframe $w.postActions \
		-text {Post Creation Actions} \
		-font font_ui
	checkbutton $w.postActions.checkout \
		-text {Checkout after creation} \
		-variable create_branch_checkout \
		-font font_ui
	pack $w.postActions.checkout -anchor nw
	pack $w.postActions -anchor nw -fill x -pady 5 -padx 5

	set create_branch_checkout 1
	set create_branch_head $current_branch
	set create_branch_revtype head

	bind $w <Visibility> "grab $w; focus $w.desc.name_t"
	bind $w <Key-Escape> "destroy $w"
	bind $w <Key-Return> "do_create_branch_action $w;break"
	wm title $w "[appname] ([reponame]): Create Branch"
	tkwait window $w
}

proc do_delete_branch_action {w} {
	global all_heads
	global delete_branch_checktype delete_branch_head delete_branch_trackinghead

	set check_rev {}
	switch -- $delete_branch_checktype {
	head {set check_rev $delete_branch_head}
	tracking {set check_rev $delete_branch_trackinghead}
	always {set check_rev {:none}}
	}
	if {$check_rev eq {:none}} {
		set check_cmt {}
	} elseif {[catch {set check_cmt [exec git rev-parse --verify "${check_rev}^0"]}]} {
		tk_messageBox \
			-icon error \
			-type ok \
			-title [wm title $w] \
			-parent $w \
			-message "Invalid check revision: $check_rev"
		return
	}

	set to_delete [list]
	set not_merged [list]
	foreach i [$w.list.l curselection] {
		set b [$w.list.l get $i]
		if {[catch {set o [exec git rev-parse --verify $b]}]} continue
		if {$check_cmt ne {}} {
			if {$b eq $check_rev} continue
			if {[catch {set m [exec git merge-base $o $check_cmt]}]} continue
			if {$o ne $m} {
				lappend not_merged $b
				continue
			}
		}
		lappend to_delete [list $b $o]
	}
	if {$not_merged ne {}} {
		set msg "The following branches are not completely merged into $check_rev:

 - [join $not_merged "\n - "]"
		tk_messageBox \
			-icon info \
			-type ok \
			-title [wm title $w] \
			-parent $w \
			-message $msg
	}
	if {$to_delete eq {}} return
	if {$delete_branch_checktype eq {always}} {
		set msg {Recovering deleted branches is difficult.

Delete the selected branches?}
		if {[tk_messageBox \
			-icon warning \
			-type yesno \
			-title [wm title $w] \
			-parent $w \
			-message $msg] ne yes} {
			return
		}
	}

	set failed {}
	foreach i $to_delete {
		set b [lindex $i 0]
		set o [lindex $i 1]
		if {[catch {exec git update-ref -d "refs/heads/$b" $o} err]} {
			append failed " - $b: $err\n"
		} else {
			set x [lsearch -sorted $all_heads $b]
			if {$x >= 0} {
				set all_heads [lreplace $all_heads $x $x]
			}
		}
	}

	if {$failed ne {}} {
		tk_messageBox \
			-icon error \
			-type ok \
			-title [wm title $w] \
			-parent $w \
			-message "Failed to delete branches:\n$failed"
	}

	set all_heads [lsort $all_heads]
	populate_branch_menu
	destroy $w
}

proc do_delete_branch {} {
	global all_heads tracking_branches current_branch
	global delete_branch_checktype delete_branch_head delete_branch_trackinghead

	set w .branch_editor
	toplevel $w
	wm geometry $w "+[winfo rootx .]+[winfo rooty .]"

	label $w.header -text {Delete Local Branch} \
		-font font_uibold
	pack $w.header -side top -fill x

	frame $w.buttons
	button $w.buttons.create -text Delete \
		-font font_ui \
		-command [list do_delete_branch_action $w]
	pack $w.buttons.create -side right
	button $w.buttons.cancel -text {Cancel} \
		-font font_ui \
		-command [list destroy $w]
	pack $w.buttons.cancel -side right -padx 5
	pack $w.buttons -side bottom -fill x -pady 10 -padx 10

	labelframe $w.list \
		-text {Local Branches} \
		-font font_ui
	listbox $w.list.l \
		-height 10 \
		-width 50 \
		-selectmode extended \
		-font font_ui
	foreach h $all_heads {
		if {$h ne $current_branch} {
			$w.list.l insert end $h
		}
	}
	pack $w.list.l -fill both -pady 5 -padx 5
	pack $w.list -fill both -pady 5 -padx 5

	labelframe $w.validate \
		-text {Delete Only If} \
		-font font_ui
	radiobutton $w.validate.head_r \
		-text {Merged Into Local Branch:} \
		-value head \
		-variable delete_branch_checktype \
		-font font_ui
	eval tk_optionMenu $w.validate.head_m delete_branch_head $all_heads
	grid $w.validate.head_r $w.validate.head_m -sticky w
	set all_trackings [all_tracking_branches]
	if {$all_trackings ne {}} {
		set delete_branch_trackinghead [lindex $all_trackings 0]
		radiobutton $w.validate.tracking_r \
			-text {Merged Into Tracking Branch:} \
			-value tracking \
			-variable delete_branch_checktype \
			-font font_ui
		eval tk_optionMenu $w.validate.tracking_m \
			delete_branch_trackinghead \
			$all_trackings
		grid $w.validate.tracking_r $w.validate.tracking_m -sticky w
	}
	radiobutton $w.validate.always_r \
		-text {Always (Do not perform merge checks)} \
		-value always \
		-variable delete_branch_checktype \
		-font font_ui
	grid $w.validate.always_r -columnspan 2 -sticky w
	grid columnconfigure $w.validate 1 -weight 1
	pack $w.validate -anchor nw -fill x -pady 5 -padx 5

	set delete_branch_head $current_branch
	set delete_branch_checktype head

	bind $w <Visibility> "grab $w; focus $w"
	bind $w <Key-Escape> "destroy $w"
	wm title $w "[appname] ([reponame]): Delete Branch"
	tkwait window $w
}

proc switch_branch {b} {
	global HEAD commit_type file_states current_branch
	global selected_commit_type ui_comm

	if {![lock_index switch]} return

	# -- Backup the selected branch (repository_state resets it)
	#
	set new_branch $current_branch

	# -- Our in memory state should match the repository.
	#
	repository_state curType curHEAD curMERGE_HEAD
	if {[string match amend* $commit_type]
		&& $curType eq {normal}
		&& $curHEAD eq $HEAD} {
	} elseif {$commit_type ne $curType || $HEAD ne $curHEAD} {
		info_popup {Last scanned state does not match repository state.

Another Git program has modified this repository
since the last scan.  A rescan must be performed
before the current branch can be changed.

The rescan will be automatically started now.
}
		unlock_index
		rescan {set ui_status_value {Ready.}}
		return
	}

	# -- Toss the message buffer if we are in amend mode.
	#
	if {[string match amend* $curType]} {
		$ui_comm delete 0.0 end
		$ui_comm edit reset
		$ui_comm edit modified false
	}

	set selected_commit_type new
	set current_branch $new_branch

	unlock_index
	error "NOT FINISHED"
}

######################################################################
##
## remote management

proc load_all_remotes {} {
	global repo_config
	global all_remotes tracking_branches

	set all_remotes [list]
	array unset tracking_branches

	set rm_dir [gitdir remotes]
	if {[file isdirectory $rm_dir]} {
		set all_remotes [glob \
			-types f \
			-tails \
			-nocomplain \
			-directory $rm_dir *]

		foreach name $all_remotes {
			catch {
				set fd [open [file join $rm_dir $name] r]
				while {[gets $fd line] >= 0} {
					if {![regexp {^Pull:[ 	]*([^:]+):(.+)$} \
						$line line src dst]} continue
					if {![regexp ^refs/ $dst]} {
						set dst "refs/heads/$dst"
					}
					set tracking_branches($dst) [list $name $src]
				}
				close $fd
			}
		}
	}

	foreach line [array names repo_config remote.*.url] {
		if {![regexp ^remote\.(.*)\.url\$ $line line name]} continue
		lappend all_remotes $name

		if {[catch {set fl $repo_config(remote.$name.fetch)}]} {
			set fl {}
		}
		foreach line $fl {
			if {![regexp {^([^:]+):(.+)$} $line line src dst]} continue
			if {![regexp ^refs/ $dst]} {
				set dst "refs/heads/$dst"
			}
			set tracking_branches($dst) [list $name $src]
		}
	}

	set all_remotes [lsort -unique $all_remotes]
}

proc populate_fetch_menu {m} {
	global all_remotes repo_config

	foreach r $all_remotes {
		set enable 0
		if {![catch {set a $repo_config(remote.$r.url)}]} {
			if {![catch {set a $repo_config(remote.$r.fetch)}]} {
				set enable 1
			}
		} else {
			catch {
				set fd [open [gitdir remotes $r] r]
				while {[gets $fd n] >= 0} {
					if {[regexp {^Pull:[ \t]*([^:]+):} $n]} {
						set enable 1
						break
					}
				}
				close $fd
			}
		}

		if {$enable} {
			$m add command \
				-label "Fetch from $r..." \
				-command [list fetch_from $r] \
				-font font_ui
		}
	}
}

proc populate_push_menu {m} {
	global all_remotes repo_config

	foreach r $all_remotes {
		set enable 0
		if {![catch {set a $repo_config(remote.$r.url)}]} {
			if {![catch {set a $repo_config(remote.$r.push)}]} {
				set enable 1
			}
		} else {
			catch {
				set fd [open [gitdir remotes $r] r]
				while {[gets $fd n] >= 0} {
					if {[regexp {^Push:[ \t]*([^:]+):} $n]} {
						set enable 1
						break
					}
				}
				close $fd
			}
		}

		if {$enable} {
			$m add command \
				-label "Push to $r..." \
				-command [list push_to $r] \
				-font font_ui
		}
	}
}

proc populate_pull_menu {m} {
	global repo_config all_remotes disable_on_lock

	foreach remote $all_remotes {
		set rb_list [list]
		if {[array get repo_config remote.$remote.url] ne {}} {
			if {[array get repo_config remote.$remote.fetch] ne {}} {
				foreach line $repo_config(remote.$remote.fetch) {
					if {[regexp {^([^:]+):} $line line rb]} {
						lappend rb_list $rb
					}
				}
			}
		} else {
			catch {
				set fd [open [gitdir remotes $remote] r]
				while {[gets $fd line] >= 0} {
					if {[regexp {^Pull:[ \t]*([^:]+):} $line line rb]} {
						lappend rb_list $rb
					}
				}
				close $fd
			}
		}

		foreach rb $rb_list {
			regsub ^refs/heads/ $rb {} rb_short
			$m add command \
				-label "Branch $rb_short from $remote..." \
				-command [list pull_remote $remote $rb] \
				-font font_ui
			lappend disable_on_lock \
				[list $m entryconf [$m index last] -state]
		}
	}
}

######################################################################
##
## icons

set filemask {
#define mask_width 14
#define mask_height 15
static unsigned char mask_bits[] = {
   0xfe, 0x1f, 0xfe, 0x1f, 0xfe, 0x1f, 0xfe, 0x1f, 0xfe, 0x1f, 0xfe, 0x1f,
   0xfe, 0x1f, 0xfe, 0x1f, 0xfe, 0x1f, 0xfe, 0x1f, 0xfe, 0x1f, 0xfe, 0x1f,
   0xfe, 0x1f, 0xfe, 0x1f, 0xfe, 0x1f};
}

image create bitmap file_plain -background white -foreground black -data {
#define plain_width 14
#define plain_height 15
static unsigned char plain_bits[] = {
   0xfe, 0x01, 0x02, 0x03, 0x02, 0x05, 0x02, 0x09, 0x02, 0x1f, 0x02, 0x10,
   0x02, 0x10, 0x02, 0x10, 0x02, 0x10, 0x02, 0x10, 0x02, 0x10, 0x02, 0x10,
   0x02, 0x10, 0x02, 0x10, 0xfe, 0x1f};
} -maskdata $filemask

image create bitmap file_mod -background white -foreground blue -data {
#define mod_width 14
#define mod_height 15
static unsigned char mod_bits[] = {
   0xfe, 0x01, 0x02, 0x03, 0x7a, 0x05, 0x02, 0x09, 0x7a, 0x1f, 0x02, 0x10,
   0xfa, 0x17, 0x02, 0x10, 0xfa, 0x17, 0x02, 0x10, 0xfa, 0x17, 0x02, 0x10,
   0xfa, 0x17, 0x02, 0x10, 0xfe, 0x1f};
} -maskdata $filemask

image create bitmap file_fulltick -background white -foreground "#007000" -data {
#define file_fulltick_width 14
#define file_fulltick_height 15
static unsigned char file_fulltick_bits[] = {
   0xfe, 0x01, 0x02, 0x1a, 0x02, 0x0c, 0x02, 0x0c, 0x02, 0x16, 0x02, 0x16,
   0x02, 0x13, 0x00, 0x13, 0x86, 0x11, 0x8c, 0x11, 0xd8, 0x10, 0xf2, 0x10,
   0x62, 0x10, 0x02, 0x10, 0xfe, 0x1f};
} -maskdata $filemask

image create bitmap file_parttick -background white -foreground "#005050" -data {
#define parttick_width 14
#define parttick_height 15
static unsigned char parttick_bits[] = {
   0xfe, 0x01, 0x02, 0x03, 0x7a, 0x05, 0x02, 0x09, 0x7a, 0x1f, 0x02, 0x10,
   0x7a, 0x14, 0x02, 0x16, 0x02, 0x13, 0x8a, 0x11, 0xda, 0x10, 0x72, 0x10,
   0x22, 0x10, 0x02, 0x10, 0xfe, 0x1f};
} -maskdata $filemask

image create bitmap file_question -background white -foreground black -data {
#define file_question_width 14
#define file_question_height 15
static unsigned char file_question_bits[] = {
   0xfe, 0x01, 0x02, 0x02, 0xe2, 0x04, 0xf2, 0x09, 0x1a, 0x1b, 0x0a, 0x13,
   0x82, 0x11, 0xc2, 0x10, 0x62, 0x10, 0x62, 0x10, 0x02, 0x10, 0x62, 0x10,
   0x62, 0x10, 0x02, 0x10, 0xfe, 0x1f};
} -maskdata $filemask

image create bitmap file_removed -background white -foreground red -data {
#define file_removed_width 14
#define file_removed_height 15
static unsigned char file_removed_bits[] = {
   0xfe, 0x01, 0x02, 0x03, 0x02, 0x05, 0x02, 0x09, 0x02, 0x1f, 0x02, 0x10,
   0x1a, 0x16, 0x32, 0x13, 0xe2, 0x11, 0xc2, 0x10, 0xe2, 0x11, 0x32, 0x13,
   0x1a, 0x16, 0x02, 0x10, 0xfe, 0x1f};
} -maskdata $filemask

image create bitmap file_merge -background white -foreground blue -data {
#define file_merge_width 14
#define file_merge_height 15
static unsigned char file_merge_bits[] = {
   0xfe, 0x01, 0x02, 0x03, 0x62, 0x05, 0x62, 0x09, 0x62, 0x1f, 0x62, 0x10,
   0xfa, 0x11, 0xf2, 0x10, 0x62, 0x10, 0x02, 0x10, 0xfa, 0x17, 0x02, 0x10,
   0xfa, 0x17, 0x02, 0x10, 0xfe, 0x1f};
} -maskdata $filemask

set ui_index .vpane.files.index.list
set ui_workdir .vpane.files.workdir.list

set all_icons(_$ui_index)   file_plain
set all_icons(A$ui_index)   file_fulltick
set all_icons(M$ui_index)   file_fulltick
set all_icons(D$ui_index)   file_removed
set all_icons(U$ui_index)   file_merge

set all_icons(_$ui_workdir) file_plain
set all_icons(M$ui_workdir) file_mod
set all_icons(D$ui_workdir) file_question
set all_icons(U$ui_workdir) file_merge
set all_icons(O$ui_workdir) file_plain

set max_status_desc 0
foreach i {
		{__ "Unmodified"}

		{_M "Modified, not staged"}
		{M_ "Staged for commit"}
		{MM "Portions staged for commit"}
		{MD "Staged for commit, missing"}

		{_O "Untracked, not staged"}
		{A_ "Staged for commit"}
		{AM "Portions staged for commit"}
		{AD "Staged for commit, missing"}

		{_D "Missing"}
		{D_ "Staged for removal"}
		{DO "Staged for removal, still present"}

		{U_ "Requires merge resolution"}
		{UU "Requires merge resolution"}
		{UM "Requires merge resolution"}
		{UD "Requires merge resolution"}
	} {
	if {$max_status_desc < [string length [lindex $i 1]]} {
		set max_status_desc [string length [lindex $i 1]]
	}
	set all_descs([lindex $i 0]) [lindex $i 1]
}
unset i

######################################################################
##
## util

proc is_MacOSX {} {
	global tcl_platform tk_library
	if {[tk windowingsystem] eq {aqua}} {
		return 1
	}
	return 0
}

proc is_Windows {} {
	global tcl_platform
	if {$tcl_platform(platform) eq {windows}} {
		return 1
	}
	return 0
}

proc bind_button3 {w cmd} {
	bind $w <Any-Button-3> $cmd
	if {[is_MacOSX]} {
		bind $w <Control-Button-1> $cmd
	}
}

proc incr_font_size {font {amt 1}} {
	set sz [font configure $font -size]
	incr sz $amt
	font configure $font -size $sz
	font configure ${font}bold -size $sz
}

proc hook_failed_popup {hook msg} {
	set w .hookfail
	toplevel $w

	frame $w.m
	label $w.m.l1 -text "$hook hook failed:" \
		-anchor w \
		-justify left \
		-font font_uibold
	text $w.m.t \
		-background white -borderwidth 1 \
		-relief sunken \
		-width 80 -height 10 \
		-font font_diff \
		-yscrollcommand [list $w.m.sby set]
	label $w.m.l2 \
		-text {You must correct the above errors before committing.} \
		-anchor w \
		-justify left \
		-font font_uibold
	scrollbar $w.m.sby -command [list $w.m.t yview]
	pack $w.m.l1 -side top -fill x
	pack $w.m.l2 -side bottom -fill x
	pack $w.m.sby -side right -fill y
	pack $w.m.t -side left -fill both -expand 1
	pack $w.m -side top -fill both -expand 1 -padx 5 -pady 10

	$w.m.t insert 1.0 $msg
	$w.m.t conf -state disabled

	button $w.ok -text OK \
		-width 15 \
		-font font_ui \
		-command "destroy $w"
	pack $w.ok -side bottom -anchor e -pady 10 -padx 10

	bind $w <Visibility> "grab $w; focus $w"
	bind $w <Key-Return> "destroy $w"
	wm title $w "[appname] ([reponame]): error"
	tkwait window $w
}

set next_console_id 0

proc new_console {short_title long_title} {
	global next_console_id console_data
	set w .console[incr next_console_id]
	set console_data($w) [list $short_title $long_title]
	return [console_init $w]
}

proc console_init {w} {
	global console_cr console_data M1B

	set console_cr($w) 1.0
	toplevel $w
	frame $w.m
	label $w.m.l1 -text "[lindex $console_data($w) 1]:" \
		-anchor w \
		-justify left \
		-font font_uibold
	text $w.m.t \
		-background white -borderwidth 1 \
		-relief sunken \
		-width 80 -height 10 \
		-font font_diff \
		-state disabled \
		-yscrollcommand [list $w.m.sby set]
	label $w.m.s -text {Working... please wait...} \
		-anchor w \
		-justify left \
		-font font_uibold
	scrollbar $w.m.sby -command [list $w.m.t yview]
	pack $w.m.l1 -side top -fill x
	pack $w.m.s -side bottom -fill x
	pack $w.m.sby -side right -fill y
	pack $w.m.t -side left -fill both -expand 1
	pack $w.m -side top -fill both -expand 1 -padx 5 -pady 10

	menu $w.ctxm -tearoff 0
	$w.ctxm add command -label "Copy" \
		-font font_ui \
		-command "tk_textCopy $w.m.t"
	$w.ctxm add command -label "Select All" \
		-font font_ui \
		-command "focus $w.m.t;$w.m.t tag add sel 0.0 end"
	$w.ctxm add command -label "Copy All" \
		-font font_ui \
		-command "
			$w.m.t tag add sel 0.0 end
			tk_textCopy $w.m.t
			$w.m.t tag remove sel 0.0 end
		"

	button $w.ok -text {Close} \
		-font font_ui \
		-state disabled \
		-command "destroy $w"
	pack $w.ok -side bottom -anchor e -pady 10 -padx 10

	bind_button3 $w.m.t "tk_popup $w.ctxm %X %Y"
	bind $w.m.t <$M1B-Key-a> "$w.m.t tag add sel 0.0 end;break"
	bind $w.m.t <$M1B-Key-A> "$w.m.t tag add sel 0.0 end;break"
	bind $w <Visibility> "focus $w"
	wm title $w "[appname] ([reponame]): [lindex $console_data($w) 0]"
	return $w
}

proc console_exec {w cmd {after {}}} {
	# -- Windows tosses the enviroment when we exec our child.
	#    But most users need that so we have to relogin. :-(
	#
	if {[is_Windows]} {
		set cmd [list sh --login -c "cd \"[pwd]\" && [join $cmd { }]"]
	}

	# -- Tcl won't let us redirect both stdout and stderr to
	#    the same pipe.  So pass it through cat...
	#
	set cmd [concat | $cmd |& cat]

	set fd_f [open $cmd r]
	fconfigure $fd_f -blocking 0 -translation binary
	fileevent $fd_f readable [list console_read $w $fd_f $after]
}

proc console_read {w fd after} {
	global console_cr console_data

	set buf [read $fd]
	if {$buf ne {}} {
		if {![winfo exists $w]} {console_init $w}
		$w.m.t conf -state normal
		set c 0
		set n [string length $buf]
		while {$c < $n} {
			set cr [string first "\r" $buf $c]
			set lf [string first "\n" $buf $c]
			if {$cr < 0} {set cr [expr {$n + 1}]}
			if {$lf < 0} {set lf [expr {$n + 1}]}

			if {$lf < $cr} {
				$w.m.t insert end [string range $buf $c $lf]
				set console_cr($w) [$w.m.t index {end -1c}]
				set c $lf
				incr c
			} else {
				$w.m.t delete $console_cr($w) end
				$w.m.t insert end "\n"
				$w.m.t insert end [string range $buf $c $cr]
				set c $cr
				incr c
			}
		}
		$w.m.t conf -state disabled
		$w.m.t see end
	}

	fconfigure $fd -blocking 1
	if {[eof $fd]} {
		if {[catch {close $fd}]} {
			if {![winfo exists $w]} {console_init $w}
			$w.m.s conf -background red -text {Error: Command Failed}
			$w.ok conf -state normal
			set ok 0
		} elseif {[winfo exists $w]} {
			$w.m.s conf -background green -text {Success}
			$w.ok conf -state normal
			set ok 1
		}
		array unset console_cr $w
		array unset console_data $w
		if {$after ne {}} {
			uplevel #0 $after $ok
		}
		return
	}
	fconfigure $fd -blocking 0
}

######################################################################
##
## ui commands

set starting_gitk_msg {Starting gitk... please wait...}

proc do_gitk {revs} {
	global ui_status_value starting_gitk_msg

	set cmd gitk
	if {$revs ne {}} {
		append cmd { }
		append cmd $revs
	}
	if {[is_Windows]} {
		set cmd "sh -c \"exec $cmd\""
	}
	append cmd { &}

	if {[catch {eval exec $cmd} err]} {
		error_popup "Failed to start gitk:\n\n$err"
	} else {
		set ui_status_value $starting_gitk_msg
		after 10000 {
			if {$ui_status_value eq $starting_gitk_msg} {
				set ui_status_value {Ready.}
			}
		}
	}
}

proc do_gc {} {
	set w [new_console {gc} {Compressing the object database}]
	console_exec $w {git gc}
}

proc do_fsck_objects {} {
	set w [new_console {fsck-objects} \
		{Verifying the object database with fsck-objects}]
	set cmd [list git fsck-objects]
	lappend cmd --full
	lappend cmd --cache
	lappend cmd --strict
	console_exec $w $cmd
}

set is_quitting 0

proc do_quit {} {
	global ui_comm is_quitting repo_config commit_type

	if {$is_quitting} return
	set is_quitting 1

	# -- Stash our current commit buffer.
	#
	set save [gitdir GITGUI_MSG]
	set msg [string trim [$ui_comm get 0.0 end]]
	if {![string match amend* $commit_type]
		&& [$ui_comm edit modified]
		&& $msg ne {}} {
		catch {
			set fd [open $save w]
			puts $fd [string trim [$ui_comm get 0.0 end]]
			close $fd
		}
	} else {
		catch {file delete $save}
	}

	# -- Stash our current window geometry into this repository.
	#
	set cfg_geometry [list]
	lappend cfg_geometry [wm geometry .]
	lappend cfg_geometry [lindex [.vpane sash coord 0] 1]
	lappend cfg_geometry [lindex [.vpane.files sash coord 0] 0]
	if {[catch {set rc_geometry $repo_config(gui.geometry)}]} {
		set rc_geometry {}
	}
	if {$cfg_geometry ne $rc_geometry} {
		catch {exec git repo-config gui.geometry $cfg_geometry}
	}

	destroy .
}

proc do_rescan {} {
	rescan {set ui_status_value {Ready.}}
}

proc unstage_helper {txt paths} {
	global file_states current_diff_path

	if {![lock_index begin-update]} return

	set pathList [list]
	set after {}
	foreach path $paths {
		switch -glob -- [lindex $file_states($path) 0] {
		A? -
		M? -
		D? {
			lappend pathList $path
			if {$path eq $current_diff_path} {
				set after {reshow_diff;}
			}
		}
		}
	}
	if {$pathList eq {}} {
		unlock_index
	} else {
		update_indexinfo \
			$txt \
			$pathList \
			[concat $after {set ui_status_value {Ready.}}]
	}
}

proc do_unstage_selection {} {
	global current_diff_path selected_paths

	if {[array size selected_paths] > 0} {
		unstage_helper \
			{Unstaging selected files from commit} \
			[array names selected_paths]
	} elseif {$current_diff_path ne {}} {
		unstage_helper \
			"Unstaging [short_path $current_diff_path] from commit" \
			[list $current_diff_path]
	}
}

proc add_helper {txt paths} {
	global file_states current_diff_path

	if {![lock_index begin-update]} return

	set pathList [list]
	set after {}
	foreach path $paths {
		switch -glob -- [lindex $file_states($path) 0] {
		_O -
		?M -
		?D -
		U? {
			lappend pathList $path
			if {$path eq $current_diff_path} {
				set after {reshow_diff;}
			}
		}
		}
	}
	if {$pathList eq {}} {
		unlock_index
	} else {
		update_index \
			$txt \
			$pathList \
			[concat $after {set ui_status_value {Ready to commit.}}]
	}
}

proc do_add_selection {} {
	global current_diff_path selected_paths

	if {[array size selected_paths] > 0} {
		add_helper \
			{Adding selected files} \
			[array names selected_paths]
	} elseif {$current_diff_path ne {}} {
		add_helper \
			"Adding [short_path $current_diff_path]" \
			[list $current_diff_path]
	}
}

proc do_add_all {} {
	global file_states

	set paths [list]
	foreach path [array names file_states] {
		switch -glob -- [lindex $file_states($path) 0] {
		U? {continue}
		?M -
		?D {lappend paths $path}
		}
	}
	add_helper {Adding all changed files} $paths
}

proc revert_helper {txt paths} {
	global file_states current_diff_path

	if {![lock_index begin-update]} return

	set pathList [list]
	set after {}
	foreach path $paths {
		switch -glob -- [lindex $file_states($path) 0] {
		U? {continue}
		?M -
		?D {
			lappend pathList $path
			if {$path eq $current_diff_path} {
				set after {reshow_diff;}
			}
		}
		}
	}

	set n [llength $pathList]
	if {$n == 0} {
		unlock_index
		return
	} elseif {$n == 1} {
		set s "[short_path [lindex $pathList]]"
	} else {
		set s "these $n files"
	}

	set reply [tk_dialog \
		.confirm_revert \
		"[appname] ([reponame])" \
		"Revert changes in $s?

Any unadded changes will be permanently lost by the revert." \
		question \
		1 \
		{Do Nothing} \
		{Revert Changes} \
		]
	if {$reply == 1} {
		checkout_index \
			$txt \
			$pathList \
			[concat $after {set ui_status_value {Ready.}}]
	} else {
		unlock_index
	}
}

proc do_revert_selection {} {
	global current_diff_path selected_paths

	if {[array size selected_paths] > 0} {
		revert_helper \
			{Reverting selected files} \
			[array names selected_paths]
	} elseif {$current_diff_path ne {}} {
		revert_helper \
			"Reverting [short_path $current_diff_path]" \
			[list $current_diff_path]
	}
}

proc do_signoff {} {
	global ui_comm

	set me [committer_ident]
	if {$me eq {}} return

	set sob "Signed-off-by: $me"
	set last [$ui_comm get {end -1c linestart} {end -1c}]
	if {$last ne $sob} {
		$ui_comm edit separator
		if {$last ne {}
			&& ![regexp {^[A-Z][A-Za-z]*-[A-Za-z-]+: *} $last]} {
			$ui_comm insert end "\n"
		}
		$ui_comm insert end "\n$sob"
		$ui_comm edit separator
		$ui_comm see end
	}
}

proc do_select_commit_type {} {
	global commit_type selected_commit_type

	if {$selected_commit_type eq {new}
		&& [string match amend* $commit_type]} {
		create_new_commit
	} elseif {$selected_commit_type eq {amend}
		&& ![string match amend* $commit_type]} {
		load_last_commit

		# The amend request was rejected...
		#
		if {![string match amend* $commit_type]} {
			set selected_commit_type new
		}
	}
}

proc do_commit {} {
	commit_tree
}

proc do_about {} {
	global appvers copyright
	global tcl_patchLevel tk_patchLevel

	set w .about_dialog
	toplevel $w
	wm geometry $w "+[winfo rootx .]+[winfo rooty .]"

	label $w.header -text "About [appname]" \
		-font font_uibold
	pack $w.header -side top -fill x

	frame $w.buttons
	button $w.buttons.close -text {Close} \
		-font font_ui \
		-command [list destroy $w]
	pack $w.buttons.close -side right
	pack $w.buttons -side bottom -fill x -pady 10 -padx 10

	label $w.desc \
		-text "[appname] - a commit creation tool for Git.
$copyright" \
		-padx 5 -pady 5 \
		-justify left \
		-anchor w \
		-borderwidth 1 \
		-relief solid \
		-font font_ui
	pack $w.desc -side top -fill x -padx 5 -pady 5

	set v {}
	append v "[appname] version $appvers\n"
	append v "[exec git version]\n"
	append v "\n"
	if {$tcl_patchLevel eq $tk_patchLevel} {
		append v "Tcl/Tk version $tcl_patchLevel"
	} else {
		append v "Tcl version $tcl_patchLevel"
		append v ", Tk version $tk_patchLevel"
	}

	label $w.vers \
		-text $v \
		-padx 5 -pady 5 \
		-justify left \
		-anchor w \
		-borderwidth 1 \
		-relief solid \
		-font font_ui
	pack $w.vers -side top -fill x -padx 5 -pady 5

	menu $w.ctxm -tearoff 0
	$w.ctxm add command \
		-label {Copy} \
		-font font_ui \
		-command "
		clipboard clear
		clipboard append -format STRING -type STRING -- \[$w.vers cget -text\]
	"

	bind $w <Visibility> "grab $w; focus $w"
	bind $w <Key-Escape> "destroy $w"
	bind_button3 $w.vers "tk_popup $w.ctxm %X %Y; grab $w; focus $w"
	wm title $w "About [appname]"
	tkwait window $w
}

proc do_options {} {
	global repo_config global_config font_descs
	global repo_config_new global_config_new

	array unset repo_config_new
	array unset global_config_new
	foreach name [array names repo_config] {
		set repo_config_new($name) $repo_config($name)
	}
	load_config 1
	foreach name [array names repo_config] {
		switch -- $name {
		gui.diffcontext {continue}
		}
		set repo_config_new($name) $repo_config($name)
	}
	foreach name [array names global_config] {
		set global_config_new($name) $global_config($name)
	}

	set w .options_editor
	toplevel $w
	wm geometry $w "+[winfo rootx .]+[winfo rooty .]"

	label $w.header -text "[appname] Options" \
		-font font_uibold
	pack $w.header -side top -fill x

	frame $w.buttons
	button $w.buttons.restore -text {Restore Defaults} \
		-font font_ui \
		-command do_restore_defaults
	pack $w.buttons.restore -side left
	button $w.buttons.save -text Save \
		-font font_ui \
		-command "
			catch {eval \[bind \[focus -displayof $w\] <FocusOut>\]}
			do_save_config $w
		"
	pack $w.buttons.save -side right
	button $w.buttons.cancel -text {Cancel} \
		-font font_ui \
		-command [list destroy $w]
	pack $w.buttons.cancel -side right -padx 5
	pack $w.buttons -side bottom -fill x -pady 10 -padx 10

	labelframe $w.repo -text "[reponame] Repository" \
		-font font_ui \
		-relief raised -borderwidth 2
	labelframe $w.global -text {Global (All Repositories)} \
		-font font_ui \
		-relief raised -borderwidth 2
	pack $w.repo -side left -fill both -expand 1 -pady 5 -padx 5
	pack $w.global -side right -fill both -expand 1 -pady 5 -padx 5

	foreach option {
		{b pullsummary {Show Pull Summary}}
		{b trustmtime  {Trust File Modification Timestamps}}
		{i diffcontext {Number of Diff Context Lines}}
		{t newbranchtemplate {New Branch Name Template}}
		} {
		set type [lindex $option 0]
		set name [lindex $option 1]
		set text [lindex $option 2]
		foreach f {repo global} {
			switch $type {
			b {
				checkbutton $w.$f.$name -text $text \
					-variable ${f}_config_new(gui.$name) \
					-onvalue true \
					-offvalue false \
					-font font_ui
				pack $w.$f.$name -side top -anchor w
			}
			i {
				frame $w.$f.$name
				label $w.$f.$name.l -text "$text:" -font font_ui
				pack $w.$f.$name.l -side left -anchor w -fill x
				spinbox $w.$f.$name.v \
					-textvariable ${f}_config_new(gui.$name) \
					-from 1 -to 99 -increment 1 \
					-width 3 \
					-font font_ui
				bind $w.$f.$name.v <FocusIn> {%W selection range 0 end}
				pack $w.$f.$name.v -side right -anchor e -padx 5
				pack $w.$f.$name -side top -anchor w -fill x
			}
			t {
				frame $w.$f.$name
				label $w.$f.$name.l -text "$text:" -font font_ui
				text $w.$f.$name.v \
					-borderwidth 1 \
					-relief sunken \
					-height 1 \
					-width 20 \
					-font font_ui
				$w.$f.$name.v insert 0.0 [set ${f}_config_new(gui.$name)]
				bind $w.$f.$name.v <Shift-Key-Tab> {focus [tk_focusPrev %W];break}
				bind $w.$f.$name.v <Key-Tab> {focus [tk_focusNext %W];break}
				bind $w.$f.$name.v <Key-Return> break
				bind $w.$f.$name.v <FocusIn> "$w.$f.$name.v tag add sel 0.0 end"
				bind $w.$f.$name.v <FocusOut> "
					set ${f}_config_new(gui.$name) \
					\[string trim \[$w.$f.$name.v get 0.0 end\]\]
				"
				pack $w.$f.$name.l -side left -anchor w
				pack $w.$f.$name.v -side left -anchor w \
					-fill x -expand 1 \
					-padx 5
				pack $w.$f.$name -side top -anchor w -fill x
			}
			}
		}
	}

	set all_fonts [lsort [font families]]
	foreach option $font_descs {
		set name [lindex $option 0]
		set font [lindex $option 1]
		set text [lindex $option 2]

		set global_config_new(gui.$font^^family) \
			[font configure $font -family]
		set global_config_new(gui.$font^^size) \
			[font configure $font -size]

		frame $w.global.$name
		label $w.global.$name.l -text "$text:" -font font_ui
		pack $w.global.$name.l -side left -anchor w -fill x
		eval tk_optionMenu $w.global.$name.family \
			global_config_new(gui.$font^^family) \
			$all_fonts
		spinbox $w.global.$name.size \
			-textvariable global_config_new(gui.$font^^size) \
			-from 2 -to 80 -increment 1 \
			-width 3 \
			-font font_ui
		bind $w.global.$name.size <FocusIn> {%W selection range 0 end}
		pack $w.global.$name.size -side right -anchor e
		pack $w.global.$name.family -side right -anchor e
		pack $w.global.$name -side top -anchor w -fill x
	}

	bind $w <Visibility> "grab $w; focus $w"
	bind $w <Key-Escape> "destroy $w"
	wm title $w "[appname] ([reponame]): Options"
	tkwait window $w
}

proc do_restore_defaults {} {
	global font_descs default_config repo_config
	global repo_config_new global_config_new

	foreach name [array names default_config] {
		set repo_config_new($name) $default_config($name)
		set global_config_new($name) $default_config($name)
	}

	foreach option $font_descs {
		set name [lindex $option 0]
		set repo_config(gui.$name) $default_config(gui.$name)
	}
	apply_config

	foreach option $font_descs {
		set name [lindex $option 0]
		set font [lindex $option 1]
		set global_config_new(gui.$font^^family) \
			[font configure $font -family]
		set global_config_new(gui.$font^^size) \
			[font configure $font -size]
	}
}

proc do_save_config {w} {
	if {[catch {save_config} err]} {
		error_popup "Failed to completely save options:\n\n$err"
	}
	reshow_diff
	destroy $w
}

proc do_windows_shortcut {} {
	global argv0

	if {[catch {
		set desktop [exec cygpath \
			--windows \
			--absolute \
			--long-name \
			--desktop]
		}]} {
			set desktop .
	}
	set fn [tk_getSaveFile \
		-parent . \
		-title "[appname] ([reponame]): Create Desktop Icon" \
		-initialdir $desktop \
		-initialfile "Git [reponame].bat"]
	if {$fn != {}} {
		if {[catch {
				set fd [open $fn w]
				set sh [exec cygpath \
					--windows \
					--absolute \
					/bin/sh]
				set me [exec cygpath \
					--unix \
					--absolute \
					$argv0]
				set gd [exec cygpath \
					--unix \
					--absolute \
					[gitdir]]
				set gw [exec cygpath \
					--windows \
					--absolute \
					[file dirname [gitdir]]]
				regsub -all ' $me "'\\''" me
				regsub -all ' $gd "'\\''" gd
				puts $fd "@ECHO Entering $gw"
				puts $fd "@ECHO Starting git-gui... please wait..."
				puts -nonewline $fd "@\"$sh\" --login -c \""
				puts -nonewline $fd "GIT_DIR='$gd'"
				puts -nonewline $fd " '$me'"
				puts $fd "&\""
				close $fd
			} err]} {
			error_popup "Cannot write script:\n\n$err"
		}
	}
}

proc do_macosx_app {} {
	global argv0 env

	set fn [tk_getSaveFile \
		-parent . \
		-title "[appname] ([reponame]): Create Desktop Icon" \
		-initialdir [file join $env(HOME) Desktop] \
		-initialfile "Git [reponame].app"]
	if {$fn != {}} {
		if {[catch {
				set Contents [file join $fn Contents]
				set MacOS [file join $Contents MacOS]
				set exe [file join $MacOS git-gui]

				file mkdir $MacOS

				set fd [open [file join $Contents Info.plist] w]
				puts $fd {<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>CFBundleDevelopmentRegion</key>
	<string>English</string>
	<key>CFBundleExecutable</key>
	<string>git-gui</string>
	<key>CFBundleIdentifier</key>
	<string>org.spearce.git-gui</string>
	<key>CFBundleInfoDictionaryVersion</key>
	<string>6.0</string>
	<key>CFBundlePackageType</key>
	<string>APPL</string>
	<key>CFBundleSignature</key>
	<string>????</string>
	<key>CFBundleVersion</key>
	<string>1.0</string>
	<key>NSPrincipalClass</key>
	<string>NSApplication</string>
</dict>
</plist>}
				close $fd

				set fd [open $exe w]
				set gd [file normalize [gitdir]]
				set ep [file normalize [exec git --exec-path]]
				regsub -all ' $gd "'\\''" gd
				regsub -all ' $ep "'\\''" ep
				puts $fd "#!/bin/sh"
				foreach name [array names env] {
					if {[string match GIT_* $name]} {
						regsub -all ' $env($name) "'\\''" v
						puts $fd "export $name='$v'"
					}
				}
				puts $fd "export PATH='$ep':\$PATH"
				puts $fd "export GIT_DIR='$gd'"
				puts $fd "exec [file normalize $argv0]"
				close $fd

				file attributes $exe -permissions u+x,g+x,o+x
			} err]} {
			error_popup "Cannot write icon:\n\n$err"
		}
	}
}

proc toggle_or_diff {w x y} {
	global file_states file_lists current_diff_path ui_index ui_workdir
	global last_clicked selected_paths

	set pos [split [$w index @$x,$y] .]
	set lno [lindex $pos 0]
	set col [lindex $pos 1]
	set path [lindex $file_lists($w) [expr {$lno - 1}]]
	if {$path eq {}} {
		set last_clicked {}
		return
	}

	set last_clicked [list $w $lno]
	array unset selected_paths
	$ui_index tag remove in_sel 0.0 end
	$ui_workdir tag remove in_sel 0.0 end

	if {$col == 0} {
		if {$current_diff_path eq $path} {
			set after {reshow_diff;}
		} else {
			set after {}
		}
		if {$w eq $ui_index} {
			update_indexinfo \
				"Unstaging [short_path $path] from commit" \
				[list $path] \
				[concat $after {set ui_status_value {Ready.}}]
		} elseif {$w eq $ui_workdir} {
			update_index \
				"Adding [short_path $path]" \
				[list $path] \
				[concat $after {set ui_status_value {Ready.}}]
		}
	} else {
		show_diff $path $w $lno
	}
}

proc add_one_to_selection {w x y} {
	global file_lists last_clicked selected_paths

	set lno [lindex [split [$w index @$x,$y] .] 0]
	set path [lindex $file_lists($w) [expr {$lno - 1}]]
	if {$path eq {}} {
		set last_clicked {}
		return
	}

	if {$last_clicked ne {}
		&& [lindex $last_clicked 0] ne $w} {
		array unset selected_paths
		[lindex $last_clicked 0] tag remove in_sel 0.0 end
	}

	set last_clicked [list $w $lno]
	if {[catch {set in_sel $selected_paths($path)}]} {
		set in_sel 0
	}
	if {$in_sel} {
		unset selected_paths($path)
		$w tag remove in_sel $lno.0 [expr {$lno + 1}].0
	} else {
		set selected_paths($path) 1
		$w tag add in_sel $lno.0 [expr {$lno + 1}].0
	}
}

proc add_range_to_selection {w x y} {
	global file_lists last_clicked selected_paths

	if {[lindex $last_clicked 0] ne $w} {
		toggle_or_diff $w $x $y
		return
	}

	set lno [lindex [split [$w index @$x,$y] .] 0]
	set lc [lindex $last_clicked 1]
	if {$lc < $lno} {
		set begin $lc
		set end $lno
	} else {
		set begin $lno
		set end $lc
	}

	foreach path [lrange $file_lists($w) \
		[expr {$begin - 1}] \
		[expr {$end - 1}]] {
		set selected_paths($path) 1
	}
	$w tag add in_sel $begin.0 [expr {$end + 1}].0
}

######################################################################
##
## config defaults

set cursor_ptr arrow
font create font_diff -family Courier -size 10
font create font_ui
catch {
	label .dummy
	eval font configure font_ui [font actual [.dummy cget -font]]
	destroy .dummy
}

font create font_uibold
font create font_diffbold

if {[is_Windows]} {
	set M1B Control
	set M1T Ctrl
} elseif {[is_MacOSX]} {
	set M1B M1
	set M1T Cmd
} else {
	set M1B M1
	set M1T M1
}

proc apply_config {} {
	global repo_config font_descs

	foreach option $font_descs {
		set name [lindex $option 0]
		set font [lindex $option 1]
		if {[catch {
			foreach {cn cv} $repo_config(gui.$name) {
				font configure $font $cn $cv
			}
			} err]} {
			error_popup "Invalid font specified in gui.$name:\n\n$err"
		}
		foreach {cn cv} [font configure $font] {
			font configure ${font}bold $cn $cv
		}
		font configure ${font}bold -weight bold
	}
}

set default_config(gui.trustmtime) false
set default_config(gui.pullsummary) true
set default_config(gui.diffcontext) 5
set default_config(gui.newbranchtemplate) {}
set default_config(gui.fontui) [font configure font_ui]
set default_config(gui.fontdiff) [font configure font_diff]
set font_descs {
	{fontui   font_ui   {Main Font}}
	{fontdiff font_diff {Diff/Console Font}}
}
load_config 0
apply_config

######################################################################
##
## ui construction

# -- Menu Bar
#
menu .mbar -tearoff 0
.mbar add cascade -label Repository -menu .mbar.repository
.mbar add cascade -label Edit -menu .mbar.edit
if {!$single_commit} {
	.mbar add cascade -label Branch -menu .mbar.branch
}
.mbar add cascade -label Commit -menu .mbar.commit
if {!$single_commit} {
	.mbar add cascade -label Fetch -menu .mbar.fetch
	.mbar add cascade -label Pull -menu .mbar.pull
	.mbar add cascade -label Push -menu .mbar.push
}
. configure -menu .mbar

# -- Repository Menu
#
menu .mbar.repository
.mbar.repository add command \
	-label {Visualize Current Branch} \
	-command {do_gitk {}} \
	-font font_ui
if {![is_MacOSX]} {
	.mbar.repository add command \
		-label {Visualize All Branches} \
		-command {do_gitk {--all}} \
		-font font_ui
}
.mbar.repository add separator

if {!$single_commit} {
	.mbar.repository add command -label {Compress Database} \
		-command do_gc \
		-font font_ui

	.mbar.repository add command -label {Verify Database} \
		-command do_fsck_objects \
		-font font_ui

	.mbar.repository add separator

	if {[is_Windows]} {
		.mbar.repository add command \
			-label {Create Desktop Icon} \
			-command do_windows_shortcut \
			-font font_ui
	} elseif {[is_MacOSX]} {
		.mbar.repository add command \
			-label {Create Desktop Icon} \
			-command do_macosx_app \
			-font font_ui
	}
}

.mbar.repository add command -label Quit \
	-command do_quit \
	-accelerator $M1T-Q \
	-font font_ui

# -- Edit Menu
#
menu .mbar.edit
.mbar.edit add command -label Undo \
	-command {catch {[focus] edit undo}} \
	-accelerator $M1T-Z \
	-font font_ui
.mbar.edit add command -label Redo \
	-command {catch {[focus] edit redo}} \
	-accelerator $M1T-Y \
	-font font_ui
.mbar.edit add separator
.mbar.edit add command -label Cut \
	-command {catch {tk_textCut [focus]}} \
	-accelerator $M1T-X \
	-font font_ui
.mbar.edit add command -label Copy \
	-command {catch {tk_textCopy [focus]}} \
	-accelerator $M1T-C \
	-font font_ui
.mbar.edit add command -label Paste \
	-command {catch {tk_textPaste [focus]; [focus] see insert}} \
	-accelerator $M1T-V \
	-font font_ui
.mbar.edit add command -label Delete \
	-command {catch {[focus] delete sel.first sel.last}} \
	-accelerator Del \
	-font font_ui
.mbar.edit add separator
.mbar.edit add command -label {Select All} \
	-command {catch {[focus] tag add sel 0.0 end}} \
	-accelerator $M1T-A \
	-font font_ui

# -- Branch Menu
#
if {!$single_commit} {
	menu .mbar.branch

	.mbar.branch add command -label {Create...} \
		-command do_create_branch \
		-accelerator $M1T-N \
		-font font_ui
	lappend disable_on_lock [list .mbar.branch entryconf \
		[.mbar.branch index last] -state]

	.mbar.branch add command -label {Delete...} \
		-command do_delete_branch \
		-font font_ui
	lappend disable_on_lock [list .mbar.branch entryconf \
		[.mbar.branch index last] -state]
}

# -- Commit Menu
#
menu .mbar.commit

.mbar.commit add radiobutton \
	-label {New Commit} \
	-command do_select_commit_type \
	-variable selected_commit_type \
	-value new \
	-font font_ui
lappend disable_on_lock \
	[list .mbar.commit entryconf [.mbar.commit index last] -state]

.mbar.commit add radiobutton \
	-label {Amend Last Commit} \
	-command do_select_commit_type \
	-variable selected_commit_type \
	-value amend \
	-font font_ui
lappend disable_on_lock \
	[list .mbar.commit entryconf [.mbar.commit index last] -state]

.mbar.commit add separator

.mbar.commit add command -label Rescan \
	-command do_rescan \
	-accelerator F5 \
	-font font_ui
lappend disable_on_lock \
	[list .mbar.commit entryconf [.mbar.commit index last] -state]

.mbar.commit add command -label {Add To Commit} \
	-command do_add_selection \
	-font font_ui
lappend disable_on_lock \
	[list .mbar.commit entryconf [.mbar.commit index last] -state]

.mbar.commit add command -label {Add All To Commit} \
	-command do_add_all \
	-accelerator $M1T-I \
	-font font_ui
lappend disable_on_lock \
	[list .mbar.commit entryconf [.mbar.commit index last] -state]

.mbar.commit add command -label {Unstage From Commit} \
	-command do_unstage_selection \
	-font font_ui
lappend disable_on_lock \
	[list .mbar.commit entryconf [.mbar.commit index last] -state]

.mbar.commit add command -label {Revert Changes} \
	-command do_revert_selection \
	-font font_ui
lappend disable_on_lock \
	[list .mbar.commit entryconf [.mbar.commit index last] -state]

.mbar.commit add separator

.mbar.commit add command -label {Sign Off} \
	-command do_signoff \
	-accelerator $M1T-S \
	-font font_ui

.mbar.commit add command -label Commit \
	-command do_commit \
	-accelerator $M1T-Return \
	-font font_ui
lappend disable_on_lock \
	[list .mbar.commit entryconf [.mbar.commit index last] -state]

# -- Transport menus
#
if {!$single_commit} {
	menu .mbar.fetch
	menu .mbar.pull
	menu .mbar.push
}

if {[is_MacOSX]} {
	# -- Apple Menu (Mac OS X only)
	#
	.mbar add cascade -label Apple -menu .mbar.apple
	menu .mbar.apple

	.mbar.apple add command -label "About [appname]" \
		-command do_about \
		-font font_ui
	.mbar.apple add command -label "[appname] Options..." \
		-command do_options \
		-font font_ui
} else {
	# -- Edit Menu
	#
	.mbar.edit add separator
	.mbar.edit add command -label {Options...} \
		-command do_options \
		-font font_ui

	# -- Tools Menu
	#
	if {[file exists /usr/local/miga/lib/gui-miga]
		&& [file exists .pvcsrc]} {
	proc do_miga {} {
		global ui_status_value
		if {![lock_index update]} return
		set cmd [list sh --login -c "/usr/local/miga/lib/gui-miga \"[pwd]\""]
		set miga_fd [open "|$cmd" r]
		fconfigure $miga_fd -blocking 0
		fileevent $miga_fd readable [list miga_done $miga_fd]
		set ui_status_value {Running miga...}
	}
	proc miga_done {fd} {
		read $fd 512
		if {[eof $fd]} {
			close $fd
			unlock_index
			rescan [list set ui_status_value {Ready.}]
		}
	}
	.mbar add cascade -label Tools -menu .mbar.tools
	menu .mbar.tools
	.mbar.tools add command -label "Migrate" \
		-command do_miga \
		-font font_ui
	lappend disable_on_lock \
		[list .mbar.tools entryconf [.mbar.tools index last] -state]
	}

	# -- Help Menu
	#
	.mbar add cascade -label Help -menu .mbar.help
	menu .mbar.help

	.mbar.help add command -label "About [appname]" \
		-command do_about \
		-font font_ui
}


# -- Branch Control
#
frame .branch \
	-borderwidth 1 \
	-relief sunken
label .branch.l1 \
	-text {Current Branch:} \
	-anchor w \
	-justify left \
	-font font_ui
label .branch.cb \
	-textvariable current_branch \
	-anchor w \
	-justify left \
	-font font_ui
pack .branch.l1 -side left
pack .branch.cb -side left -fill x
pack .branch -side top -fill x

# -- Main Window Layout
#
panedwindow .vpane -orient vertical
panedwindow .vpane.files -orient horizontal
.vpane add .vpane.files -sticky nsew -height 100 -width 200
pack .vpane -anchor n -side top -fill both -expand 1

# -- Index File List
#
frame .vpane.files.index -height 100 -width 200
label .vpane.files.index.title -text {Changes To Be Committed} \
	-background green \
	-font font_ui
text $ui_index -background white -borderwidth 0 \
	-width 20 -height 10 \
	-wrap none \
	-font font_ui \
	-cursor $cursor_ptr \
	-xscrollcommand {.vpane.files.index.sx set} \
	-yscrollcommand {.vpane.files.index.sy set} \
	-state disabled
scrollbar .vpane.files.index.sx -orient h -command [list $ui_index xview]
scrollbar .vpane.files.index.sy -orient v -command [list $ui_index yview]
pack .vpane.files.index.title -side top -fill x
pack .vpane.files.index.sx -side bottom -fill x
pack .vpane.files.index.sy -side right -fill y
pack $ui_index -side left -fill both -expand 1
.vpane.files add .vpane.files.index -sticky nsew

# -- Working Directory File List
#
frame .vpane.files.workdir -height 100 -width 200
label .vpane.files.workdir.title -text {Changed But Not Updated} \
	-background red \
	-font font_ui
text $ui_workdir -background white -borderwidth 0 \
	-width 20 -height 10 \
	-wrap none \
	-font font_ui \
	-cursor $cursor_ptr \
	-xscrollcommand {.vpane.files.workdir.sx set} \
	-yscrollcommand {.vpane.files.workdir.sy set} \
	-state disabled
scrollbar .vpane.files.workdir.sx -orient h -command [list $ui_workdir xview]
scrollbar .vpane.files.workdir.sy -orient v -command [list $ui_workdir yview]
pack .vpane.files.workdir.title -side top -fill x
pack .vpane.files.workdir.sx -side bottom -fill x
pack .vpane.files.workdir.sy -side right -fill y
pack $ui_workdir -side left -fill both -expand 1
.vpane.files add .vpane.files.workdir -sticky nsew

foreach i [list $ui_index $ui_workdir] {
	$i tag conf in_diff -font font_uibold
	$i tag conf in_sel \
		-background [$i cget -foreground] \
		-foreground [$i cget -background]
}
unset i

# -- Diff and Commit Area
#
frame .vpane.lower -height 300 -width 400
frame .vpane.lower.commarea
frame .vpane.lower.diff -relief sunken -borderwidth 1
pack .vpane.lower.commarea -side top -fill x
pack .vpane.lower.diff -side bottom -fill both -expand 1
.vpane add .vpane.lower -stick nsew

# -- Commit Area Buttons
#
frame .vpane.lower.commarea.buttons
label .vpane.lower.commarea.buttons.l -text {} \
	-anchor w \
	-justify left \
	-font font_ui
pack .vpane.lower.commarea.buttons.l -side top -fill x
pack .vpane.lower.commarea.buttons -side left -fill y

button .vpane.lower.commarea.buttons.rescan -text {Rescan} \
	-command do_rescan \
	-font font_ui
pack .vpane.lower.commarea.buttons.rescan -side top -fill x
lappend disable_on_lock \
	{.vpane.lower.commarea.buttons.rescan conf -state}

button .vpane.lower.commarea.buttons.incall -text {Add All} \
	-command do_add_all \
	-font font_ui
pack .vpane.lower.commarea.buttons.incall -side top -fill x
lappend disable_on_lock \
	{.vpane.lower.commarea.buttons.incall conf -state}

button .vpane.lower.commarea.buttons.signoff -text {Sign Off} \
	-command do_signoff \
	-font font_ui
pack .vpane.lower.commarea.buttons.signoff -side top -fill x

button .vpane.lower.commarea.buttons.commit -text {Commit} \
	-command do_commit \
	-font font_ui
pack .vpane.lower.commarea.buttons.commit -side top -fill x
lappend disable_on_lock \
	{.vpane.lower.commarea.buttons.commit conf -state}

# -- Commit Message Buffer
#
frame .vpane.lower.commarea.buffer
frame .vpane.lower.commarea.buffer.header
set ui_comm .vpane.lower.commarea.buffer.t
set ui_coml .vpane.lower.commarea.buffer.header.l
radiobutton .vpane.lower.commarea.buffer.header.new \
	-text {New Commit} \
	-command do_select_commit_type \
	-variable selected_commit_type \
	-value new \
	-font font_ui
lappend disable_on_lock \
	[list .vpane.lower.commarea.buffer.header.new conf -state]
radiobutton .vpane.lower.commarea.buffer.header.amend \
	-text {Amend Last Commit} \
	-command do_select_commit_type \
	-variable selected_commit_type \
	-value amend \
	-font font_ui
lappend disable_on_lock \
	[list .vpane.lower.commarea.buffer.header.amend conf -state]
label $ui_coml \
	-anchor w \
	-justify left \
	-font font_ui
proc trace_commit_type {varname args} {
	global ui_coml commit_type
	switch -glob -- $commit_type {
	initial       {set txt {Initial Commit Message:}}
	amend         {set txt {Amended Commit Message:}}
	amend-initial {set txt {Amended Initial Commit Message:}}
	amend-merge   {set txt {Amended Merge Commit Message:}}
	merge         {set txt {Merge Commit Message:}}
	*             {set txt {Commit Message:}}
	}
	$ui_coml conf -text $txt
}
trace add variable commit_type write trace_commit_type
pack $ui_coml -side left -fill x
pack .vpane.lower.commarea.buffer.header.amend -side right
pack .vpane.lower.commarea.buffer.header.new -side right

text $ui_comm -background white -borderwidth 1 \
	-undo true \
	-maxundo 20 \
	-autoseparators true \
	-relief sunken \
	-width 75 -height 9 -wrap none \
	-font font_diff \
	-yscrollcommand {.vpane.lower.commarea.buffer.sby set}
scrollbar .vpane.lower.commarea.buffer.sby \
	-command [list $ui_comm yview]
pack .vpane.lower.commarea.buffer.header -side top -fill x
pack .vpane.lower.commarea.buffer.sby -side right -fill y
pack $ui_comm -side left -fill y
pack .vpane.lower.commarea.buffer -side left -fill y

# -- Commit Message Buffer Context Menu
#
set ctxm .vpane.lower.commarea.buffer.ctxm
menu $ctxm -tearoff 0
$ctxm add command \
	-label {Cut} \
	-font font_ui \
	-command {tk_textCut $ui_comm}
$ctxm add command \
	-label {Copy} \
	-font font_ui \
	-command {tk_textCopy $ui_comm}
$ctxm add command \
	-label {Paste} \
	-font font_ui \
	-command {tk_textPaste $ui_comm}
$ctxm add command \
	-label {Delete} \
	-font font_ui \
	-command {$ui_comm delete sel.first sel.last}
$ctxm add separator
$ctxm add command \
	-label {Select All} \
	-font font_ui \
	-command {focus $ui_comm;$ui_comm tag add sel 0.0 end}
$ctxm add command \
	-label {Copy All} \
	-font font_ui \
	-command {
		$ui_comm tag add sel 0.0 end
		tk_textCopy $ui_comm
		$ui_comm tag remove sel 0.0 end
	}
$ctxm add separator
$ctxm add command \
	-label {Sign Off} \
	-font font_ui \
	-command do_signoff
bind_button3 $ui_comm "tk_popup $ctxm %X %Y"

# -- Diff Header
#
set current_diff_path {}
set diff_actions [list]
proc trace_current_diff_path {varname args} {
	global current_diff_path diff_actions file_states
	if {$current_diff_path eq {}} {
		set s {}
		set f {}
		set p {}
		set o disabled
	} else {
		set p $current_diff_path
		set s [mapdesc [lindex $file_states($p) 0] $p]
		set f {File:}
		set p [escape_path $p]
		set o normal
	}

	.vpane.lower.diff.header.status configure -text $s
	.vpane.lower.diff.header.file configure -text $f
	.vpane.lower.diff.header.path configure -text $p
	foreach w $diff_actions {
		uplevel #0 $w $o
	}
}
trace add variable current_diff_path write trace_current_diff_path

frame .vpane.lower.diff.header -background orange
label .vpane.lower.diff.header.status \
	-background orange \
	-width $max_status_desc \
	-anchor w \
	-justify left \
	-font font_ui
label .vpane.lower.diff.header.file \
	-background orange \
	-anchor w \
	-justify left \
	-font font_ui
label .vpane.lower.diff.header.path \
	-background orange \
	-anchor w \
	-justify left \
	-font font_ui
pack .vpane.lower.diff.header.status -side left
pack .vpane.lower.diff.header.file -side left
pack .vpane.lower.diff.header.path -fill x
set ctxm .vpane.lower.diff.header.ctxm
menu $ctxm -tearoff 0
$ctxm add command \
	-label {Copy} \
	-font font_ui \
	-command {
		clipboard clear
		clipboard append \
			-format STRING \
			-type STRING \
			-- $current_diff_path
	}
lappend diff_actions [list $ctxm entryconf [$ctxm index last] -state]
bind_button3 .vpane.lower.diff.header.path "tk_popup $ctxm %X %Y"

# -- Diff Body
#
frame .vpane.lower.diff.body
set ui_diff .vpane.lower.diff.body.t
text $ui_diff -background white -borderwidth 0 \
	-width 80 -height 15 -wrap none \
	-font font_diff \
	-xscrollcommand {.vpane.lower.diff.body.sbx set} \
	-yscrollcommand {.vpane.lower.diff.body.sby set} \
	-state disabled
scrollbar .vpane.lower.diff.body.sbx -orient horizontal \
	-command [list $ui_diff xview]
scrollbar .vpane.lower.diff.body.sby -orient vertical \
	-command [list $ui_diff yview]
pack .vpane.lower.diff.body.sbx -side bottom -fill x
pack .vpane.lower.diff.body.sby -side right -fill y
pack $ui_diff -side left -fill both -expand 1
pack .vpane.lower.diff.header -side top -fill x
pack .vpane.lower.diff.body -side bottom -fill both -expand 1

$ui_diff tag conf d_@ -foreground blue -font font_diffbold
$ui_diff tag conf d_+ -foreground {#00a000}
$ui_diff tag conf d_- -foreground red

$ui_diff tag conf d_++ -foreground {#00a000}
$ui_diff tag conf d_-- -foreground red
$ui_diff tag conf d_+s \
	-foreground {#00a000} \
	-background {#e2effa}
$ui_diff tag conf d_-s \
	-foreground red \
	-background {#e2effa}
$ui_diff tag conf d_s+ \
	-foreground {#00a000} \
	-background ivory1
$ui_diff tag conf d_s- \
	-foreground red \
	-background ivory1

$ui_diff tag conf d<<<<<<< \
	-foreground orange \
	-font font_diffbold
$ui_diff tag conf d======= \
	-foreground orange \
	-font font_diffbold
$ui_diff tag conf d>>>>>>> \
	-foreground orange \
	-font font_diffbold

$ui_diff tag raise sel

# -- Diff Body Context Menu
#
set ctxm .vpane.lower.diff.body.ctxm
menu $ctxm -tearoff 0
$ctxm add command \
	-label {Refresh} \
	-font font_ui \
	-command reshow_diff
$ctxm add command \
	-label {Copy} \
	-font font_ui \
	-command {tk_textCopy $ui_diff}
lappend diff_actions [list $ctxm entryconf [$ctxm index last] -state]
$ctxm add command \
	-label {Select All} \
	-font font_ui \
	-command {focus $ui_diff;$ui_diff tag add sel 0.0 end}
lappend diff_actions [list $ctxm entryconf [$ctxm index last] -state]
$ctxm add command \
	-label {Copy All} \
	-font font_ui \
	-command {
		$ui_diff tag add sel 0.0 end
		tk_textCopy $ui_diff
		$ui_diff tag remove sel 0.0 end
	}
lappend diff_actions [list $ctxm entryconf [$ctxm index last] -state]
$ctxm add separator
$ctxm add command \
	-label {Decrease Font Size} \
	-font font_ui \
	-command {incr_font_size font_diff -1}
lappend diff_actions [list $ctxm entryconf [$ctxm index last] -state]
$ctxm add command \
	-label {Increase Font Size} \
	-font font_ui \
	-command {incr_font_size font_diff 1}
lappend diff_actions [list $ctxm entryconf [$ctxm index last] -state]
$ctxm add separator
$ctxm add command \
	-label {Show Less Context} \
	-font font_ui \
	-command {if {$repo_config(gui.diffcontext) >= 2} {
		incr repo_config(gui.diffcontext) -1
		reshow_diff
	}}
lappend diff_actions [list $ctxm entryconf [$ctxm index last] -state]
$ctxm add command \
	-label {Show More Context} \
	-font font_ui \
	-command {
		incr repo_config(gui.diffcontext)
		reshow_diff
	}
lappend diff_actions [list $ctxm entryconf [$ctxm index last] -state]
$ctxm add separator
$ctxm add command -label {Options...} \
	-font font_ui \
	-command do_options
bind_button3 $ui_diff "tk_popup $ctxm %X %Y"

# -- Status Bar
#
set ui_status_value {Initializing...}
label .status -textvariable ui_status_value \
	-anchor w \
	-justify left \
	-borderwidth 1 \
	-relief sunken \
	-font font_ui
pack .status -anchor w -side bottom -fill x

# -- Load geometry
#
catch {
set gm $repo_config(gui.geometry)
wm geometry . [lindex $gm 0]
.vpane sash place 0 \
	[lindex [.vpane sash coord 0] 0] \
	[lindex $gm 1]
.vpane.files sash place 0 \
	[lindex $gm 2] \
	[lindex [.vpane.files sash coord 0] 1]
unset gm
}

# -- Key Bindings
#
bind $ui_comm <$M1B-Key-Return> {do_commit;break}
bind $ui_comm <$M1B-Key-i> {do_add_all;break}
bind $ui_comm <$M1B-Key-I> {do_add_all;break}
bind $ui_comm <$M1B-Key-x> {tk_textCut %W;break}
bind $ui_comm <$M1B-Key-X> {tk_textCut %W;break}
bind $ui_comm <$M1B-Key-c> {tk_textCopy %W;break}
bind $ui_comm <$M1B-Key-C> {tk_textCopy %W;break}
bind $ui_comm <$M1B-Key-v> {tk_textPaste %W; %W see insert; break}
bind $ui_comm <$M1B-Key-V> {tk_textPaste %W; %W see insert; break}
bind $ui_comm <$M1B-Key-a> {%W tag add sel 0.0 end;break}
bind $ui_comm <$M1B-Key-A> {%W tag add sel 0.0 end;break}

bind $ui_diff <$M1B-Key-x> {tk_textCopy %W;break}
bind $ui_diff <$M1B-Key-X> {tk_textCopy %W;break}
bind $ui_diff <$M1B-Key-c> {tk_textCopy %W;break}
bind $ui_diff <$M1B-Key-C> {tk_textCopy %W;break}
bind $ui_diff <$M1B-Key-v> {break}
bind $ui_diff <$M1B-Key-V> {break}
bind $ui_diff <$M1B-Key-a> {%W tag add sel 0.0 end;break}
bind $ui_diff <$M1B-Key-A> {%W tag add sel 0.0 end;break}
bind $ui_diff <Key-Up>     {catch {%W yview scroll -1 units};break}
bind $ui_diff <Key-Down>   {catch {%W yview scroll  1 units};break}
bind $ui_diff <Key-Left>   {catch {%W xview scroll -1 units};break}
bind $ui_diff <Key-Right>  {catch {%W xview scroll  1 units};break}

if {!$single_commit} {
	bind . <$M1B-Key-n> do_create_branch
	bind . <$M1B-Key-N> do_create_branch
}

bind .   <Destroy> do_quit
bind all <Key-F5> do_rescan
bind all <$M1B-Key-r> do_rescan
bind all <$M1B-Key-R> do_rescan
bind .   <$M1B-Key-s> do_signoff
bind .   <$M1B-Key-S> do_signoff
bind .   <$M1B-Key-i> do_add_all
bind .   <$M1B-Key-I> do_add_all
bind .   <$M1B-Key-Return> do_commit
bind all <$M1B-Key-q> do_quit
bind all <$M1B-Key-Q> do_quit
bind all <$M1B-Key-w> {destroy [winfo toplevel %W]}
bind all <$M1B-Key-W> {destroy [winfo toplevel %W]}
foreach i [list $ui_index $ui_workdir] {
	bind $i <Button-1>       "toggle_or_diff         $i %x %y; break"
	bind $i <$M1B-Button-1>  "add_one_to_selection   $i %x %y; break"
	bind $i <Shift-Button-1> "add_range_to_selection $i %x %y; break"
}
unset i

set file_lists($ui_index) [list]
set file_lists($ui_workdir) [list]

set HEAD {}
set PARENT {}
set MERGE_HEAD [list]
set commit_type {}
set empty_tree {}
set current_branch {}
set current_diff_path {}
set selected_commit_type new

wm title . "[appname] ([file normalize [file dirname [gitdir]]])"
focus -force $ui_comm

# -- Warn the user about environmental problems.  Cygwin's Tcl
#    does *not* pass its env array onto any processes it spawns.
#    This means that git processes get none of our environment.
#
if {[is_Windows]} {
	set ignored_env 0
	set suggest_user {}
	set msg "Possible environment issues exist.

The following environment variables are probably
going to be ignored by any Git subprocess run
by [appname]:

"
	foreach name [array names env] {
		switch -regexp -- $name {
		{^GIT_INDEX_FILE$} -
		{^GIT_OBJECT_DIRECTORY$} -
		{^GIT_ALTERNATE_OBJECT_DIRECTORIES$} -
		{^GIT_DIFF_OPTS$} -
		{^GIT_EXTERNAL_DIFF$} -
		{^GIT_PAGER$} -
		{^GIT_TRACE$} -
		{^GIT_CONFIG$} -
		{^GIT_CONFIG_LOCAL$} -
		{^GIT_(AUTHOR|COMMITTER)_DATE$} {
			append msg " - $name\n"
			incr ignored_env
		}
		{^GIT_(AUTHOR|COMMITTER)_(NAME|EMAIL)$} {
			append msg " - $name\n"
			incr ignored_env
			set suggest_user $name
		}
		}
	}
	if {$ignored_env > 0} {
		append msg "
This is due to a known issue with the
Tcl binary distributed by Cygwin."

		if {$suggest_user ne {}} {
			append msg "

A good replacement for $suggest_user
is placing values for the user.name and
user.email settings into your personal
~/.gitconfig file.
"
		}
		warn_popup $msg
	}
	unset ignored_env msg suggest_user name
}

# -- Only initialize complex UI if we are going to stay running.
#
if {!$single_commit} {
	load_all_remotes
	load_all_heads

	populate_branch_menu
	populate_fetch_menu .mbar.fetch
	populate_pull_menu .mbar.pull
	populate_push_menu .mbar.push
}

# -- Only suggest a gc run if we are going to stay running.
#
if {!$single_commit} {
	set object_limit 2000
	if {[is_Windows]} {set object_limit 200}
	regexp {^([0-9]+) objects,} [exec git count-objects] _junk objects_current
	if {$objects_current >= $object_limit} {
		if {[ask_popup \
			"This repository currently has $objects_current loose objects.

To maintain optimal performance it is strongly
recommended that you compress the database
when more than $object_limit loose objects exist.

Compress the database now?"] eq yes} {
			do_gc
		}
	}
	unset object_limit _junk objects_current
}

lock_index begin-read
after 1 do_rescan