35105: completion: git: add distance_from_head to __git_recent_commits

This adds the "HEAD~15" gitrevisions(7) identifier of the commit to the
description, which also uniquifies, isn't redundant, and may be easier
to type.

Ref: zsh-workers/34820 (http://www.zsh.org/mla/workers/2015/msg00744.html)

1 files changed, 14 insertions, 1 deletions

diff --git a/Completion/Unix/Command/_git b/Completion/Unix/Command/_git
index 4222bf211..708eb2a06 100644
--- a/Completion/Unix/Command/_git
+++ b/Completion/Unix/Command/_git
@@ -5672,6 +5672,7 @@ __git_recent_commits () {
   local gitdir expl start
   declare -a descr tags heads commits
   local i j k
+  integer distance_from_head
 
   # Careful: most %d will expand to the empty string.  Quote properly!
   # NOTE: we could use %D directly, but it's not available in git 1.9.1 at least.
@@ -5681,7 +5682,19 @@ __git_recent_commits () {
   for i j k in "$commits[@]" ; do
     # Note: the after-the-colon part must be unique across the entire array;
     # see workers/34768
-    descr+=("$i:[$i] $k")
+    if (( distance_from_head == 0 )); then
+      descr+=($i:"[HEAD]    $k")
+    elif (( distance_from_head == 1 )); then
+      descr+=($i:"[HEAD^]   $k")
+    elif (( distance_from_head == 2 )); then
+      descr+=($i:"[HEAD^^]  $k")
+    elif (( distance_from_head < 10 )); then
+      descr+=($i:"[HEAD~$distance_from_head]  $k")
+    else
+      descr+=($i:"[HEAD~$distance_from_head] $k")
+    fi
+    (( ++distance_from_head ))
+
     j=${${j# \(}%\)} # strip leading ' (' and trailing ')'
     j=${j/ ->/,}  # Convert " -> master, origin/master".
     for j in ${(s:, :)j}; do