bash completion: refactor common log, shortlog and gitk options

Refactor options that are useful for more than one of them into a
variable used by the relevant completions.  This has the effect of
adding the following options to git-log:

  --branches --tags --remotes --first-parent --dense --sparse
  --simplify-merges --simplify-by-decoration --first-parent
  --no-merges

The following to git-shortlog:

  --branches --tags --remotes --first-parent

And the following to gitk:

  --branches --tags --remotes --first-parent --no-merges --max-count=
  --max-age= --since= --after= --min-age= --until= --before= --dense
  --sparse --full-history --simplify-merges --simplify-by-decoration
  --left-right

Signed-off-by: Thomas Rast <trast@student.ethz.ch>
Acked-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

contrib/completion/git-completion.bash

@@ -975,6 +975,27 @@ _git_ls_tree ()
 	__git_complete_file
 }
 
+# Options that go well for log, shortlog and gitk
+__git_log_common_options="
+	--not --all
+	--branches --tags --remotes
+	--first-parent --no-merges
+	--max-count=
+	--max-age= --since= --after=
+	--min-age= --until= --before=
+"
+# Options that go well for log and gitk (not shortlog)
+__git_log_gitk_options="
+	--dense --sparse --full-history
+	--simplify-merges --simplify-by-decoration
+	--left-right
+"
+# Options that go well for log and shortlog (not gitk)
+__git_log_shortlog_options="
+	--author= --committer= --grep=
+	--all-match
+"
+
 __git_log_pretty_formats="oneline short medium full fuller email raw format:"
 
 _git_log ()
@@ -996,21 +1017,19 @@ _git_log ()
 		;;
 	--*)
 		__gitcomp "
-			--max-count= --max-age= --since= --after=
-			--min-age= --before= --until=
+			$__git_log_common_options
+			$__git_log_shortlog_options
+			$__git_log_gitk_options
 			--root --topo-order --date-order --reverse
-			--no-merges --follow
+			--follow
 			--abbrev-commit --abbrev=
 			--relative-date --date=
-			--author= --committer= --grep=
-			--all-match
 			--pretty=
-			--not --all
-			--left-right --cherry-pick
+			--cherry-pick
 			--graph
 			--decorate
 			--walk-reflogs
-			--parents --children --full-history
+			--parents --children
 			--merge
 			$__git_diff_common_options
 			--pickaxe-all --pickaxe-regex
@@ -1496,12 +1515,8 @@ _git_shortlog ()
 	case "$cur" in
 	--*)
 		__gitcomp "
-			--max-count= --max-age= --since= --after=
-			--min-age= --before= --until=
-			--no-merges
-			--author= --committer= --grep=
-			--all-match
-			--not --all
+			$__git_log_common_options
+			$__git_log_shortlog_options
 			--numbered --summary
 			"
 		return
@@ -1828,7 +1843,11 @@ _gitk ()
 	fi
 	case "$cur" in
 	--*)
-		__gitcomp "--not --all $merge"
+		__gitcomp "
+			$__git_log_common_options
+			$__git_log_gitk_options
+			$merge
+			"
 		return
 		;;
 	esac