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builtin/show-ref: refactor --exclude-existing
options
It's not immediately obvious options which options are applicable to what subcommand in git-show-ref(1) because all options exist as global state. This can easily cause confusion for the reader. Refactor options for the `--exclude-existing` subcommand to be contained in a separate structure. This structure is stored on the stack and passed down as required. Consequently, it clearly delimits the scope of those options and requires the reader to worry less about global state. Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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53921d5f8e
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7907fb0c97
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@ -19,8 +19,7 @@ static const char * const show_ref_usage[] = {
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};
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static int deref_tags, show_head, tags_only, heads_only, found_match, verify,
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quiet, hash_only, abbrev, exclude_arg;
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static const char *exclude_existing_arg;
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quiet, hash_only, abbrev;
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static void show_one(const char *refname, const struct object_id *oid)
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{
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@ -95,6 +94,15 @@ static int add_existing(const char *refname,
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return 0;
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}
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struct exclude_existing_options {
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/*
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* We need an explicit `enabled` field because it is perfectly valid
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* for `pattern` to be `NULL` even if `--exclude-existing` was given.
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*/
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int enabled;
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const char *pattern;
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};
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/*
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* read "^(?:<anything>\s)?<refname>(?:\^\{\})?$" from the standard input,
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* and
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@ -104,11 +112,11 @@ static int add_existing(const char *refname,
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* (4) ignore if refname is a ref that exists in the local repository;
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* (5) otherwise output the line.
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*/
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static int cmd_show_ref__exclude_existing(const char *match)
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static int cmd_show_ref__exclude_existing(const struct exclude_existing_options *opts)
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{
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struct string_list existing_refs = STRING_LIST_INIT_DUP;
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char buf[1024];
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int matchlen = match ? strlen(match) : 0;
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int patternlen = opts->pattern ? strlen(opts->pattern) : 0;
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for_each_ref(add_existing, &existing_refs);
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while (fgets(buf, sizeof(buf), stdin)) {
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@ -124,11 +132,11 @@ static int cmd_show_ref__exclude_existing(const char *match)
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for (ref = buf + len; buf < ref; ref--)
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if (isspace(ref[-1]))
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break;
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if (match) {
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if (opts->pattern) {
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int reflen = buf + len - ref;
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if (reflen < matchlen)
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if (reflen < patternlen)
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continue;
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if (strncmp(ref, match, matchlen))
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if (strncmp(ref, opts->pattern, patternlen))
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continue;
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}
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if (check_refname_format(ref, 0)) {
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@ -201,13 +209,17 @@ static int hash_callback(const struct option *opt, const char *arg, int unset)
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static int exclude_existing_callback(const struct option *opt, const char *arg,
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int unset)
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{
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struct exclude_existing_options *opts = opt->value;
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BUG_ON_OPT_NEG(unset);
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exclude_arg = 1;
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*(const char **)opt->value = arg;
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opts->enabled = 1;
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opts->pattern = arg;
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return 0;
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}
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static const struct option show_ref_options[] = {
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int cmd_show_ref(int argc, const char **argv, const char *prefix)
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{
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struct exclude_existing_options exclude_existing_opts = {0};
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const struct option show_ref_options[] = {
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OPT_BOOL(0, "tags", &tags_only, N_("only show tags (can be combined with heads)")),
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OPT_BOOL(0, "heads", &heads_only, N_("only show heads (can be combined with tags)")),
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OPT_BOOL(0, "verify", &verify, N_("stricter reference checking, "
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@ -224,21 +236,19 @@ static const struct option show_ref_options[] = {
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OPT__ABBREV(&abbrev),
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OPT__QUIET(&quiet,
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N_("do not print results to stdout (useful with --verify)")),
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OPT_CALLBACK_F(0, "exclude-existing", &exclude_existing_arg,
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OPT_CALLBACK_F(0, "exclude-existing", &exclude_existing_opts,
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N_("pattern"), N_("show refs from stdin that aren't in local repository"),
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PARSE_OPT_OPTARG | PARSE_OPT_NONEG, exclude_existing_callback),
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OPT_END()
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};
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int cmd_show_ref(int argc, const char **argv, const char *prefix)
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{
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git_config(git_default_config, NULL);
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argc = parse_options(argc, argv, prefix, show_ref_options,
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show_ref_usage, 0);
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if (exclude_arg)
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return cmd_show_ref__exclude_existing(exclude_existing_arg);
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if (exclude_existing_opts.enabled)
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return cmd_show_ref__exclude_existing(&exclude_existing_opts);
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else if (verify)
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return cmd_show_ref__verify(argv);
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else
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