git-fetch: rewrite another shell loop in C

Move another shell loop that canonicalizes the list of refs for
underlying git-fetch-pack and fetch-native-store into C.

This seems to shave the runtime for the same 1000 branch
repository from 30 seconds down to 15 seconds (it used to be 2
and half minutes with the original version).

Signed-off-by: Junio C Hamano <junkio@cox.net>

1 files changed, 46 insertions, 0 deletions

diff --git a/builtin-fetch--tool.c b/builtin-fetch--tool.c
index 24343ac9b0..705a6649a9 100644
--- a/builtin-fetch--tool.c
+++ b/builtin-fetch--tool.c
@@ -283,6 +283,46 @@ static int fetch_native_store(FILE *fp,
 	return err;
 }
 
+static int parse_reflist(const char *reflist)
+{
+	const char *ref;
+
+	printf("refs='");
+	for (ref = reflist; ref; ) {
+		const char *next;
+		while (*ref && isspace(*ref))
+			ref++;
+		if (!*ref)
+			break;
+		for (next = ref; *next && !isspace(*next); next++)
+			;
+		printf("\n%.*s", (int)(next - ref), ref);
+		ref = next;
+	}
+	printf("'\n");
+
+	printf("rref='");
+	for (ref = reflist; ref; ) {
+		const char *next, *colon;
+		while (*ref && isspace(*ref))
+			ref++;
+		if (!*ref)
+			break;
+		for (next = ref; *next && !isspace(*next); next++)
+			;
+		if (*ref == '.')
+			ref++;
+		if (*ref == '+')
+			ref++;
+		colon = strchr(ref, ':');
+		putchar('\n');
+		printf("%.*s", (int)((colon ? colon : next) - ref), ref);
+		ref = next;
+	}
+	printf("'\n");
+	return 0;
+}
+
 int cmd_fetch__tool(int argc, const char **argv, const char *prefix)
 {
 	int verbose = 0;
@@ -335,5 +375,11 @@ int cmd_fetch__tool(int argc, const char **argv, const char *prefix)
 		fclose(fp);
 		return result;
 	}
+	if (!strcmp("parse-reflist", argv[1])) {
+		if (argc != 3)
+			return error("parse-reflist takes 1 arg");
+		return parse_reflist(argv[2]);
+	}
+
 	return error("Unknown subcommand: %s", argv[1]);
 }