git-gui: Added support for pulling from default branch of a remote.

We now create one menu entry per remote listing the first Pull: or fetch
entry associated with that remote as the branch to pull into the current
branch.

This is actually quite incorrect as we should be using the default
remote branch name listed in branch.<name>.merge for a new-style remote
described in the config file.  But its a good default to get started with.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

git-gui

@@ -592,16 +592,31 @@ proc fetch_from {remote} {
 	set w [new_console "fetch $remote" \
 		"Fetching new changes from $remote"]
 	set cmd [list git fetch]
-	lappend cmd -v
 	lappend cmd $remote
 	console_exec $w $cmd
 }
 
+proc pull_remote {remote branch} {
+	set w [new_console "pull $remote $branch" \
+		"Pulling new changes from branch $branch in $remote"]
+	set cmd [list git pull]
+	lappend cmd $remote
+	lappend cmd $branch
+	console_exec $w $cmd [list post_pull_remote $remote $branch]
+}
+
+proc post_pull_remote {remote branch success} {
+	if {$success} {
+		update_status "Successfully pulled $branch from $remote."
+	} else {
+		update_status "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 -v
 	lappend cmd $remote
 	console_exec $w $cmd
 }
@@ -829,7 +844,7 @@ proc load_all_remotes {} {
 }
 
 proc populate_remote_menu {m pfx op} {
-	global gitdir all_remotes mainfont
+	global all_remotes mainfont
 
 	foreach remote $all_remotes {
 		$m add command -label "$pfx $remote..." \
@@ -838,6 +853,40 @@ proc populate_remote_menu {m pfx op} {
 	}
 }
 
+proc populate_pull_menu {m} {
+	global gitdir repo_config all_remotes mainfont
+
+	foreach remote $all_remotes {
+		set rb {}
+		if {[array get repo_config remote.$remote.url] != {}} {
+			if {[array get repo_config remote.$remote.fetch] != {}} {
+				regexp {^([^:]+):} \
+					[lindex $repo_config(remote.$remote.fetch) 0] \
+					line rb
+			}
+		} else {
+			catch {
+				set fd [open [file join $gitdir remotes $remote] r]
+				while {[gets $fd line] >= 0} {
+					if {[regexp {^Pull:[ \t]*([^:]+):} $line line rb]} {
+						break
+					}
+				}
+				close $fd
+			}
+		}
+
+		set rb_short $rb
+		regsub ^refs/heads/ $rb {} rb_short
+		if {$rb_short != {}} {
+			$m add command \
+				-label "Branch $rb_short from $remote..." \
+				-command [list pull_remote $remote $rb] \
+				-font $mainfont
+		}
+	}
+}
+
 ######################################################################
 ##
 ## icons
@@ -966,7 +1015,9 @@ proc show_msg {w top msg} {
 	pack $w.ok -side bottom
 	bind $top <Visibility> "grab $top; focus $top"
 	bind $top <Key-Return> "destroy $top"
-	wm title $top "error: $appname ([file normalize [file dirname $gitdir]])"
+	wm title $w "$appname ([lindex [file split \
+		[file normalize [file dirname $gitdir]]] \
+		end]): error"
 	tkwait window $top
 }
 
@@ -1011,7 +1062,9 @@ proc hook_failed_popup {hook msg} {
 
 	bind $w <Visibility> "grab $w; focus $w"
 	bind $w <Key-Return> "destroy $w"
-	wm title $w "error: $appname ([file normalize [file dirname $gitdir]])"
+	wm title $w "$appname ([lindex [file split \
+		[file normalize [file dirname $gitdir]]] \
+		end]): error"
 	tkwait window $w
 }
 
@@ -1060,11 +1113,13 @@ proc console_init {w} {
 	pack $w.ok -side bottom
 
 	bind $w <Visibility> "focus $w"
-	wm title $w "$appname ([file dirname [file normalize [file dirname $gitdir]]]): [lindex $console_data($w) 0]"
+	wm title $w "$appname ([lindex [file split \
+		[file normalize [file dirname $gitdir]]] \
+		end]): [lindex $console_data($w) 0]"
 	return $w
 }
 
-proc console_exec {w cmd} {
+proc console_exec {w cmd {after {}}} {
 	global tcl_platform
 
 	# -- Windows tosses the enviroment when we exec our child.
@@ -1081,10 +1136,10 @@ proc console_exec {w cmd} {
 
 	set fd_f [open $cmd r]
 	fconfigure $fd_f -blocking 0 -translation binary
-	fileevent $fd_f readable [list console_read $w $fd_f]
+	fileevent $fd_f readable [list console_read $w $fd_f $after]
 }
 
-proc console_read {w fd} {
+proc console_read {w fd after} {
 	global console_cr console_data
 
 	set buf [read $fd]
@@ -1123,13 +1178,18 @@ proc console_read {w fd} {
 			$w.m.s conf -background red -text {Error: Command Failed}
 			$w.ok conf -text Close
 			$w.ok conf -state normal
+			set ok 0
 		} elseif {[winfo exists $w]} {
 			$w.m.s conf -background green -text {Success}
 			$w.ok conf -text Close
 			$w.ok conf -state normal
+			set ok 1
 		}
 		array unset console_cr $w
 		array unset console_data $w
+		if {$after != {}} {
+			uplevel #0 $after $ok
+		}
 		return
 	}
 	fconfigure $fd -blocking 0
@@ -1558,4 +1618,5 @@ load_repo_config
 load_all_remotes
 populate_remote_menu .mbar.fetch From fetch_from
 populate_remote_menu .mbar.push To push_to
+populate_pull_menu .mbar.pull
 update_status