[PATCH v2] gitk: Add a "Copy commit summary" command

[Beat Bolli <dev+git@drbeat.li>]

When referring to earlier commits in commit messages or other text, one
of the established formats is

    <abbrev-sha> ("<summary>", <author-date>)

Add a "Copy commit summary" command to the context menu that puts this
text for the currently selected commit on the clipboard. This makes it
easy for our users to create well-formatted commit references.

Signed-off-by: Beat Bolli <dev+git@drbeat.li>
Cc: Paul Mackerras <paulus@samba.org>
---
 gitk-git/gitk | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/gitk-git/gitk b/gitk-git/gitk
index 9a2daf3..72a2756 100755
--- a/gitk-git/gitk
+++ b/gitk-git/gitk
@@ -2617,6 +2617,7 @@ proc makewindow {} {
 	{mc "Diff selected -> this" command {diffvssel 1}}
 	{mc "Make patch" command mkpatch}
 	{mc "Create tag" command mktag}
+	{mc "Copy commit summary" command copysummary}
 	{mc "Write commit to file" command writecommit}
 	{mc "Create new branch" command mkbranch}
 	{mc "Cherry-pick this commit" command cherrypick}
@@ -9341,6 +9342,19 @@ proc mktaggo {} {
     mktagcan
 }
 
+proc copysummary {} {
+    global rowmenuid commitinfo
+
+    set id [string range $rowmenuid 0 7]
+    set info $commitinfo($rowmenuid)
+    set commit [lindex $info 0]
+    set date [formatdate [lindex $info 2]]
+    set summary "$id (\"$commit\", $date)"
+
+    clipboard clear
+    clipboard append $summary
+}
+
 proc writecommit {} {
     global rowmenuid wrcomtop commitinfo wrcomcmd NS
 
-- 
2.1.4