PATCH to add a button to perform a meld on the current file

[Pierre Marc Dumuid <pierre.dumuid@adelaide.edu.au>]

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Here's a dodgy [not that good] patch to perform a GUI comparison on a file.
It is dodgy because it assumes cogito is installed, and you want to use 
meld, and it doesn't remove the temporary files.

Not expecting this to go into main branch, but I find it handy for my 
own purposes nether-the-less.

Pierre

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--- /usr/bin/gitk	2007-08-06 07:55:41.000000000 +0930
+++ /home/pmdumuid/bin/gitkpmd	2007-09-07 14:09:28.000000000 +0930
@@ -609,7 +609,9 @@
 	-command changediffdisp -variable diffelide -value {0 1}
     radiobutton .bleft.mid.new -text "New version" \
 	-command changediffdisp -variable diffelide -value {1 0}
-    pack .bleft.mid.diff .bleft.mid.old .bleft.mid.new -side left
+    button .bleft.top.meld -text "GUI diff" -command doguidiff \
+	-font $uifont
+    pack .bleft.mid.diff .bleft.mid.old .bleft.mid.new .bleft.top.meld -side left
     set ctext .bleft.ctext
     text $ctext -background $bgcolor -foreground $fgcolor \
 	-state disabled -font $textfont \
@@ -4564,6 +4566,19 @@
     }
 }
 
+proc doguidiff {} {
+    global cflist sha1string
+
+    set taglist [$cflist tag ranges highlight]
+    set from [lindex $taglist 0]
+    set to [lindex $taglist 1]
+
+    set fname [$cflist get $from $to]
+    exec cg-admin-cat -r $sha1string^ $fname > .gitk_diffolder
+    exec cg-admin-cat -r $sha1string $fname > .gitk_diffnewer
+    exec meld .gitk_diffolder .gitk_diffnewer &
+}
+
 proc dosearch {} {
     global sstring ctext searchstring searchdirn