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convert: refactor capabilities negotiation 

The code to negotiate long running filter capabilities was very
repetitive for new capabilities. Replace the repetitive conditional
statements with a table-driven approach. This is useful for the
subsequent patch 'convert: add "status=delayed" to filter process
protocol'.

Suggested-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Lars Schneider <larsxschneider@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Lars Schneider 2017-06-30 22:41:27 +02:00 committed by Junio C Hamano
parent 9364fc298a
commit 1514c8edd6
1 changed files with 27 additions and 12 deletions
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39
convert.c
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@ -507,7 +507,7 @@ static struct hashmap subprocess_map;
static int start_multi_file_filter_fn(struct subprocess_entry *subprocess)
{
int err;
int err, i;
struct cmd2process *entry = (struct cmd2process *)subprocess;
struct string_list cap_list = STRING_LIST_INIT_NODUP;
char *cap_buf;
@ -515,6 +515,14 @@ static int start_multi_file_filter_fn(struct subprocess_entry *subprocess)
struct child_process *process = &subprocess->process;
const char *cmd = subprocess->cmd;
static const struct {
const char *name;
unsigned int cap;
} known_caps[] = {
{ "clean", CAP_CLEAN },
{ "smudge", CAP_SMUDGE },
};
sigchain_push(SIGPIPE, SIG_IGN);
err = packet_writel(process->in, "git-filter-client", "version=2", NULL);
@ -533,7 +541,15 @@ static int start_multi_file_filter_fn(struct subprocess_entry *subprocess)
if (err)
goto done;
err = packet_writel(process->in, "capability=clean", "capability=smudge", NULL);
for (i = 0; i < ARRAY_SIZE(known_caps); ++i) {
err = packet_write_fmt_gently(
process->in, "capability=%s\n", known_caps[i].name);
if (err)
goto done;
}
err = packet_flush_gently(process->in);
if (err)
goto done;
for (;;) {
cap_buf = packet_read_line(process->out, NULL);
@ -545,16 +561,15 @@ static int start_multi_file_filter_fn(struct subprocess_entry *subprocess)
continue;
cap_name = cap_list.items[1].string;
if (!strcmp(cap_name, "clean")) {
entry->supported_capabilities |= CAP_CLEAN;
} else if (!strcmp(cap_name, "smudge")) {
entry->supported_capabilities |= CAP_SMUDGE;
} else {
warning(
"external filter '%s' requested unsupported filter capability '%s'",
cmd, cap_name
);
}
i = ARRAY_SIZE(known_caps) - 1;
while (i >= 0 && strcmp(cap_name, known_caps[i].name))
i--;
if (i >= 0)
entry->supported_capabilities |= known_caps[i].cap;
else
warning("external filter '%s' requested unsupported filter capability '%s'",
cmd, cap_name);
string_list_clear(&cap_list, 0);
}