Merge branch 'da/smerge'

"git mergetool" learned to offer Sublime Merge (smerge) as one of
its backends.

* da/smerge:
  contrib/completion: add smerge to the mergetool completion candidates
  mergetools: add support for smerge (Sublime Merge)

contrib/completion/git-completion.bash

@@ -1501,7 +1501,8 @@ _git_diff ()
 }
 
 __git_mergetools_common="diffuse diffmerge ecmerge emerge kdiff3 meld opendiff
-			tkdiff vimdiff gvimdiff xxdiff araxis p4merge bc codecompare
+			tkdiff vimdiff gvimdiff xxdiff araxis p4merge bc
+			codecompare smerge
 "
 
 _git_difftool ()

git-mergetool--lib.sh

@@ -279,6 +279,7 @@ list_merge_tool_candidates () {
 		fi
 		tools="$tools gvimdiff diffuse diffmerge ecmerge"
 		tools="$tools p4merge araxis bc codecompare"
+		tools="$tools smerge"
 	fi
 	case "${VISUAL:-$EDITOR}" in
 	*vim*)

mergetools/smerge

@@ -0,0 +1,12 @@
+diff_cmd () {
+	"$merge_tool_path" mergetool "$LOCAL" "$REMOTE" -o "$MERGED"
+}
+
+merge_cmd () {
+	if $base_present
+	then
+		"$merge_tool_path" mergetool "$BASE" "$LOCAL" "$REMOTE" -o "$MERGED"
+	else
+		"$merge_tool_path" mergetool "$LOCAL" "$REMOTE" -o "$MERGED"
+	fi
+}