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.

The <abbrev-sha> is produced with the %h format specifier to make it
unique. Its length can be controlled with the gitk preference
"Auto-select SHA1 (length)", or, if this preference is set to its
default value (40), with the Git config setting core.abbrev.

Signed-off-by: Beat Bolli <dev+...@drbeat.li>
Cc: Paul Mackerras <pau...@samba.org>
---
Changes since v3:
- consider $autosellen for the --abbrev value

Changes since v2:
- call git show to produce a unique <abbrev-sha>
- use the short date format

Changes since v1:
- drop the "commit " literal in front of the <abbrev-sha>

Signed-off-by: Beat Bolli <dev+...@drbeat.li>
---
 gitk-git/gitk | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/gitk-git/gitk b/gitk-git/gitk
index 9a2daf3..d05169a 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 +9342,20 @@ proc mktaggo {} {
     mktagcan
 }
 
+proc copysummary {} {
+    global rowmenuid autosellen
+
+    set format "%h (\"%s\", %ad)"
+    set cmd [list git show -s --pretty=format:$format --date=short]
+    if {$autosellen < 40} {
+        lappend cmd --abbrev=$autosellen
+    }
+    set summary [eval exec $cmd $rowmenuid]
+
+    clipboard clear
+    clipboard append $summary
+}
+
 proc writecommit {} {
     global rowmenuid wrcomtop commitinfo wrcomcmd NS
 
-- 
2.1.4
--
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