[PATCH 2/3] sequencer: factor out todo command name parsing

["Phillip Wood via GitGitGadget" <gitgitgadget@gmail.com>]

From: Phillip Wood <phillip.wood@dunelm.org.uk>

Factor out the code that parses the name of the command at the start of
each line in the todo file into it's own function so that it can be used
in the next commit.

Signed-off-by: Phillip Wood <phillip.wood@dunelm.org.uk>
---
 sequencer.c | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/sequencer.c b/sequencer.c
index 919e3153f5..793f86bf9a 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -2076,6 +2076,18 @@ const char *todo_item_get_arg(struct todo_list *todo_list,
 	return todo_list->buf.buf + item->arg_offset;
 }
 
+static int is_command(enum todo_command command, const char **bol)
+{
+	const char *str = todo_command_info[command].str;
+	const char nick = todo_command_info[command].c;
+	const char *p = *bol + 1;
+
+	return skip_prefix(*bol, str, bol) ||
+		((nick && **bol == nick) &&
+		 (*p == ' ' || *p == '\t' || *p == '\n' || *p == '\r' || !*p) &&
+		 (*bol = p));
+}
+
 static int parse_insn_line(struct repository *r, struct todo_item *item,
 			   const char *buf, const char *bol, char *eol)
 {
@@ -2097,12 +2109,7 @@ static int parse_insn_line(struct repository *r, struct todo_item *item,
 	}
 
 	for (i = 0; i < TODO_COMMENT; i++)
-		if (skip_prefix(bol, todo_command_info[i].str, &bol)) {
-			item->command = i;
-			break;
-		} else if ((bol + 1 == eol || bol[1] == ' ' || bol[1] == '\t') &&
-			   *bol == todo_command_info[i].c) {
-			bol++;
+		if (is_command(i, &bol)) {
 			item->command = i;
 			break;
 		}
-- 
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