[PATCH GITK 4/6] gitk: Provide for config to specify tags not to abbreviate

[Ian Jackson <ijackson@xxxxxxxxxxxxxxxxxxxxxx>]

Tags matching a new multi-valued config option log.noAbbrevTags
are not abbreviated.

The config setting is in git config logs.* rather than gitk's
own configuration, because:

 - Tools which manage git trees may want to set this, depending
   on their knowledge of the nature of the tags likely to be
   present;

 - Whether this property ought to be set is mostly a property of the
   contents of the tag namespaces in the tree, not a user preference.
   (Although of course user preferences are supported.)

 - Other git utilities (or out of tree utilities) may want to
   reference this setting for their own display purposes.

There will be another, separate, patch to the `git' tree to document
this config option.

Background motivation:

Debian's dgit archive gateway tool generates and uses tags called
archive/debian/VERSION.  If such a tag refers to a Debian source tree,
it is probably very interesting because it refers to a version
actually uploaded to Debian by the Debian package maintainer.

We would therefore like a way to specify that such tags should be
displayed in full.  dgit will be able to set an appropriate config
setting in the trees it deals with.

Signed-off-by: Ian Jackson <ijackson@xxxxxxxxxxxxxxxxxxxxxx>
---
 gitk | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/gitk b/gitk
index d76f1e3..515d7b0 100755
--- a/gitk
+++ b/gitk
@@ -6547,6 +6547,14 @@ proc totalwidth {l font extra} {
 }
 
 proc tag_want_unabbrev {tag} {
+    global noabbrevtags
+    # noabbrevtags was reversed when we read config, so take first match
+    foreach pat $noabbrevtags {
+	set inverted [regsub {^\^} $pat {} pat]
+	if {[string match $pat $tag]} {
+	    return [expr {!$inverted}]
+	}
+    }
     return 0
 }
 
@@ -12138,6 +12146,11 @@ set tclencoding [tcl_encoding $gitencoding]
 if {$tclencoding == {}} {
     puts stderr "Warning: encoding $gitencoding is not supported by Tcl/Tk"
 }
+set noabbrevtags {}
+catch {
+    set noabbrevtags [exec git config --get-all log.noAbbrevTags]
+}
+set noabbrevtags [lreverse [split $noabbrevtags "\n"]]
 
 set gui_encoding [encoding system]
 catch {
-- 
2.10.1