gitk: Make cherry-pick call git-citool on conflicts

Now that git-gui has facilities to help users resolve
conflicts, it makes sense to launch it from other GUI
tools when they happen.

Signed-off-by: Alexander Gavrilov <angavrilov@gmail.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>

diff --git a/gitk b/gitk
index 41d3d2d..4168648 100755 (executable)
--- a/gitk
+++ b/gitk
@@ -8088,6 +8088,32 @@ proc mkbrgo {top} {
     }
 }
 
+proc exec_citool {tool_args {baseid {}}} {
+    global commitinfo env
+
+    set save_env [array get env GIT_AUTHOR_*]
+
+    if {$baseid ne {}} {
+       if {![info exists commitinfo($baseid)]} {
+           getcommit $baseid
+       }
+       set author [lindex $commitinfo($baseid) 1]
+       set date [lindex $commitinfo($baseid) 2]
+       if {[regexp {^\s*(\S.*\S|\S)\s*<(.*)>\s*$} \
+                   $author author name email]
+           && $date ne {}} {
+           set env(GIT_AUTHOR_NAME) $name
+           set env(GIT_AUTHOR_EMAIL) $email
+           set env(GIT_AUTHOR_DATE) $date
+       }
+    }
+
+    eval exec git citool $tool_args &
+
+    array unset env GIT_AUTHOR_*
+    array set env $save_env
+}
+
 proc cherrypick {} {
     global rowmenuid curview
     global mainhead mainheadid
@@ -8106,7 +8132,19 @@ proc cherrypick {} {
     # no error occurs, and exec takes that as an indication of error...
     if {[catch {exec sh -c "git cherry-pick -r $rowmenuid 2>&1"} err]} {
        notbusy cherrypick
-       error_popup $err
+       if {[regexp -line \
+           {Entry '(.*)' would be overwritten by merge} $err msg fname]} {
+           error_popup [mc "Cherry-pick failed:
+file '%s' had local modifications.
+
+Please commit, reset or stash your changes." $fname]
+       } elseif {[regexp -line {^CONFLICT \(.*\):} $err msg]} {
+           # Force citool to read MERGE_MSG
+           file delete [file join [gitdir] "GITGUI_MSG"]
+           exec_citool {} $rowmenuid
+       } else {
+           error_popup $err
+       }
        return
     }
     set newhead [exec git rev-parse HEAD]