sequencer (rebase -i): implement the short commands

For users' convenience, most rebase commands can be abbreviated, e.g.
'p' instead of 'pick' and 'x' instead of 'exec'. Let's teach the
sequencer to handle those abbreviated commands just fine.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 21 insertions, 14 deletions

diff --git a/sequencer.c b/sequencer.c
index 6a939a1..29b944d 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -678,20 +678,23 @@ enum todo_command {
 	TODO_NOOP
 };
 
-static const char *todo_command_strings[] = {
-	"pick",
-	"revert",
-	"edit",
-	"fixup",
-	"squash",
-	"exec",
-	"noop"
+static struct {
+	char c;
+	const char *str;
+} todo_command_info[] = {
+	{ 'p', "pick" },
+	{ 0,   "revert" },
+	{ 'e', "edit" },
+	{ 'f', "fixup" },
+	{ 's', "squash" },
+	{ 'x', "exec" },
+	{ 0,   "noop" }
 };
 
 static const char *command_to_string(const enum todo_command command)
 {
-	if ((size_t)command < ARRAY_SIZE(todo_command_strings))
-		return todo_command_strings[command];
+	if ((size_t)command < ARRAY_SIZE(todo_command_info))
+		return todo_command_info[command].str;
 	die("Unknown command: %d", command);
 }
 
@@ -1087,12 +1090,16 @@ static int parse_insn_line(struct todo_item *item, const char *bol, char *eol)
 		return 0;
 	}
 
-	for (i = 0; i < ARRAY_SIZE(todo_command_strings); i++)
-		if (skip_prefix(bol, todo_command_strings[i], &bol)) {
+	for (i = 0; i < ARRAY_SIZE(todo_command_info); i++)
+		if (skip_prefix(bol, todo_command_info[i].str, &bol)) {
+			item->command = i;
+			break;
+		} else if (bol[1] == ' ' && *bol == todo_command_info[i].c) {
+			bol++;
 			item->command = i;
 			break;
 		}
-	if (i >= ARRAY_SIZE(todo_command_strings))
+	if (i >= ARRAY_SIZE(todo_command_info))
 		return -1;
 
 	if (item->command == TODO_NOOP) {
@@ -1287,7 +1294,7 @@ static int walk_revs_populate_todo(struct todo_list *todo_list,
 {
 	enum todo_command command = opts->action == REPLAY_PICK ?
 		TODO_PICK : TODO_REVERT;
-	const char *command_string = todo_command_strings[command];
+	const char *command_string = todo_command_info[command].str;
 	struct commit *commit;
 
 	if (prepare_revs(opts))