On Thu, Nov 17 2022, Teng Long wrote:
> From: Teng Long <dyroneteng@xxxxxxxxx>
>
> In preparation for actually implementing the '--pattern' option, we
> add a new method called 'match_pattern' that uses regular expressions
> to match 'ls-tree' entities.
>
> Signed-off-by: Teng Long <dyroneteng@xxxxxxxxx>
> ---
> builtin/ls-tree.c | 27 +++++++++++++++++++++++++++
> 1 file changed, 27 insertions(+)
>
> diff --git a/builtin/ls-tree.c b/builtin/ls-tree.c
> index 7661170f7ca..03dd3fbcb26 100644
> --- a/builtin/ls-tree.c
> +++ b/builtin/ls-tree.c
> @@ -24,6 +24,7 @@ static struct pathspec pathspec;
> static int chomp_prefix;
> static const char *ls_tree_prefix;
> static const char *format;
> +static const char *pattern;
> struct show_tree_data {
> unsigned mode;
> enum object_type type;
> @@ -46,6 +47,32 @@ static enum ls_tree_cmdmode {
> MODE_OBJECT_ONLY,
> } cmdmode;
>
> +__attribute__((unused))
This isn't portable (we'd need a check in git-compat-util.h, and in any
case just squashing this whole commit into 6/6 where it actually gets
used would be better.
> +static int match_pattern(const char *line)
> +{
> + int ret = 0;
> + regex_t r;
> + regmatch_t m[1];
> + char errbuf[64];
> +
> + ret = regcomp(&r, pattern, 0);
> + if (ret) {
> + regerror(ret, &r, errbuf, sizeof(errbuf));
> + die("failed regcomp() for pattern '%s' (%s)", pattern, errbuf);
> + }
> + ret = regexec(&r, line, 1, m, 0);
> + if (ret) {
> + if (ret == REG_NOMATCH)
> + goto cleanup;
> + regerror(ret, &r, errbuf, sizeof(errbuf));
> + die("failed regexec() for subject '%s' (%s)", line, errbuf);
> + }
> +
> +cleanup:
> + regfree(&r);
> + return ret;
> +}
> +
> static void expand_objectsize(struct strbuf *line, const struct object_id *oid,
> const enum object_type type, unsigned int padded)
> {
