gitk: Don't filter view arguments through git rev-parse

Previously we passed the arguments indicating what commits the user
wants to view through git rev-parse to get a list of IDs (positive and
negative), then gave that to git log.  This had a couple of problems,
notably that --merge and --left-right didn't get handled properly.

Instead we now just pass the original arguments to git log.  When doing
an update, we append --not followed by the list of commits we have seen
that have no children, since we have got (or will get) their ancestors
from the first git log.  If the first git log isn't finished yet, we
might get some duplicates from the second git log, but that doesn't
cause any problem.

Also get rid of the unused vnextroot variable.

Signed-off-by: Paul Mackerras <paulus@samba.org>

gitk

@@ -94,30 +94,21 @@ proc dorunq {} {
 proc start_rev_list {view} {
     global startmsecs
     global commfd leftover tclencoding datemode
-    global viewargs viewfiles commitidx viewcomplete vnextroot
+    global viewargs viewfiles commitidx viewcomplete
     global showlocalchanges commitinterest mainheadid
     global progressdirn progresscoords proglastnc curview
-    global viewincl viewactive loginstance viewinstances
+    global viewactive loginstance viewinstances
     global pending_select mainheadid
 
     set startmsecs [clock clicks -milliseconds]
     set commitidx($view) 0
     set viewcomplete($view) 0
     set viewactive($view) 1
-    set vnextroot($view) 0
     varcinit $view
 
-    set commits [eval exec git rev-parse --default HEAD --revs-only \
-		     $viewargs($view)]
-    set viewincl($view) {}
-    foreach c $commits {
-	if {[regexp {^[0-9a-fA-F]{40}$} $c]} {
-	    lappend viewincl($view) $c
-	}
-    }
     if {[catch {
 	set fd [open [concat | git log --no-color -z --pretty=raw --parents \
-			 --boundary $commits "--" $viewfiles($view)] r]
+			 --boundary $viewargs($view) "--" $viewfiles($view)] r]
     } err]} {
 	error_popup "[mc "Error executing git log:"] $err"
 	exit 1
@@ -170,9 +161,9 @@ proc getcommits {} {
 }
 
 proc updatecommits {} {
-    global curview viewargs viewfiles viewincl viewinstances
+    global curview viewargs viewfiles viewinstances
     global viewactive viewcomplete loginstance tclencoding mainheadid
-    global varcid startmsecs commfd showneartags showlocalchanges leftover
+    global startmsecs commfd showneartags showlocalchanges leftover
     global mainheadid pending_select
 
     set oldmainid $mainheadid
@@ -186,33 +177,10 @@ proc updatecommits {} {
 	}
     }
     set view $curview
-    set commits [exec git rev-parse --default HEAD --revs-only \
-		     $viewargs($view)]
-    set pos {}
-    set neg {}
-    set flags {}
-    foreach c $commits {
-	if {[string match "^*" $c]} {
-	    lappend neg $c
-	} elseif {[regexp {^[0-9a-fA-F]{40}$} $c]} {
-	    if {!([info exists varcid($view,$c)] ||
-		  [lsearch -exact $viewincl($view) $c] >= 0)} {
-		lappend pos $c
-	    }
-	} else {
-	    lappend flags $c
-	}
-    }
-    if {$pos eq {}} {
-	return
-    }
-    foreach id $viewincl($view) {
-	lappend neg "^$id"
-    }
-    set viewincl($view) [concat $viewincl($view) $pos]
     if {[catch {
 	set fd [open [concat | git log --no-color -z --pretty=raw --parents \
-			 --boundary $pos $neg $flags "--" $viewfiles($view)] r]
+			  --boundary $viewargs($view) --not [seeds $view] \
+			  "--" $viewfiles($view)] r]
     } err]} {
 	error_popup "Error executing git log: $err"
 	exit 1
@@ -322,6 +290,19 @@ proc resetvarcs {view} {
     catch {unset ordertok}
 }
 
+# returns a list of the commits with no children
+proc seeds {v} {
+    global vdownptr vleftptr varcstart
+
+    set ret {}
+    set a [lindex $vdownptr($v) 0]
+    while {$a != 0} {
+	lappend ret [lindex $varcstart($v) $a]
+	set a [lindex $vleftptr($v) $a]
+    }
+    return $ret
+}
+
 proc newvarc {view id} {
     global varcid varctok parents children datemode
     global vupptr vdownptr vleftptr vbackptr varcrow varcix varcstart
@@ -1000,7 +981,7 @@ proc getcommitlines {fd inst view updating}  {
     global cmitlisted commitinterest leftover
     global commitidx commitdata datemode
     global parents children curview hlview
-    global vnextroot idpending ordertok
+    global idpending ordertok
     global varccommits varcid varctok vtokmod viewfiles
 
     set stuff [read $fd 500000]
@@ -7103,7 +7084,7 @@ proc mkbrgo {top} {
 }
 
 proc cherrypick {} {
-    global rowmenuid curview viewincl
+    global rowmenuid curview
     global mainhead mainheadid
 
     set oldhead [exec git rev-parse HEAD]
@@ -7137,12 +7118,6 @@ proc cherrypick {} {
 	    movedhead $newhead $mainhead
 	    set mainheadid $newhead
 	}
-	# remove oldhead from viewincl and add newhead
-	set i [lsearch -exact $viewincl($curview) $oldhead]
-	if {$i >= 0} {
-	    set viewincl($curview) [lreplace $viewincl($curview) $i $i]
-	}
-	lappend viewincl($curview) $newhead
 	redrawtags $oldhead
 	redrawtags $newhead
 	selbyid $newhead