diff options
Diffstat (limited to 'third_party/git/builtin/show-ref.c')
| -rw-r--r-- | third_party/git/builtin/show-ref.c | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/third_party/git/builtin/show-ref.c b/third_party/git/builtin/show-ref.c new file mode 100644 index 000000000000..6456da70cc2c --- /dev/null +++ b/third_party/git/builtin/show-ref.c @@ -0,0 +1,226 @@ +#include "builtin.h" +#include "cache.h" +#include "config.h" +#include "refs.h" +#include "object-store.h" +#include "object.h" +#include "tag.h" +#include "string-list.h" +#include "parse-options.h" + +static const char * const show_ref_usage[] = { + N_("git show-ref [-q | --quiet] [--verify] [--head] [-d | --dereference] [-s | --hash[=<n>]] [--abbrev[=<n>]] [--tags] [--heads] [--] [<pattern>...]"), + N_("git show-ref --exclude-existing[=<pattern>]"), + NULL +}; + +static int deref_tags, show_head, tags_only, heads_only, found_match, verify, + quiet, hash_only, abbrev, exclude_arg; +static const char **pattern; +static const char *exclude_existing_arg; + +static void show_one(const char *refname, const struct object_id *oid) +{ + const char *hex; + struct object_id peeled; + + if (!has_object_file(oid)) + die("git show-ref: bad ref %s (%s)", refname, + oid_to_hex(oid)); + + if (quiet) + return; + + hex = find_unique_abbrev(oid, abbrev); + if (hash_only) + printf("%s\n", hex); + else + printf("%s %s\n", hex, refname); + + if (!deref_tags) + return; + + if (!peel_ref(refname, &peeled)) { + hex = find_unique_abbrev(&peeled, abbrev); + printf("%s %s^{}\n", hex, refname); + } +} + +static int show_ref(const char *refname, const struct object_id *oid, + int flag, void *cbdata) +{ + if (show_head && !strcmp(refname, "HEAD")) + goto match; + + if (tags_only || heads_only) { + int match; + + match = heads_only && starts_with(refname, "refs/heads/"); + match |= tags_only && starts_with(refname, "refs/tags/"); + if (!match) + return 0; + } + if (pattern) { + int reflen = strlen(refname); + const char **p = pattern, *m; + while ((m = *p++) != NULL) { + int len = strlen(m); + if (len > reflen) + continue; + if (memcmp(m, refname + reflen - len, len)) + continue; + if (len == reflen) + goto match; + if (refname[reflen - len - 1] == '/') + goto match; + } + return 0; + } + +match: + found_match++; + + show_one(refname, oid); + + return 0; +} + +static int add_existing(const char *refname, const struct object_id *oid, + int flag, void *cbdata) +{ + struct string_list *list = (struct string_list *)cbdata; + string_list_insert(list, refname); + return 0; +} + +/* + * read "^(?:<anything>\s)?<refname>(?:\^\{\})?$" from the standard input, + * and + * (1) strip "^{}" at the end of line if any; + * (2) ignore if match is provided and does not head-match refname; + * (3) warn if refname is not a well-formed refname and skip; + * (4) ignore if refname is a ref that exists in the local repository; + * (5) otherwise output the line. + */ +static int exclude_existing(const char *match) +{ + static struct string_list existing_refs = STRING_LIST_INIT_DUP; + char buf[1024]; + int matchlen = match ? strlen(match) : 0; + + for_each_ref(add_existing, &existing_refs); + while (fgets(buf, sizeof(buf), stdin)) { + char *ref; + int len = strlen(buf); + + if (len > 0 && buf[len - 1] == '\n') + buf[--len] = '\0'; + if (3 <= len && !strcmp(buf + len - 3, "^{}")) { + len -= 3; + buf[len] = '\0'; + } + for (ref = buf + len; buf < ref; ref--) + if (isspace(ref[-1])) + break; + if (match) { + int reflen = buf + len - ref; + if (reflen < matchlen) + continue; + if (strncmp(ref, match, matchlen)) + continue; + } + if (check_refname_format(ref, 0)) { + warning("ref '%s' ignored", ref); + continue; + } + if (!string_list_has_string(&existing_refs, ref)) { + printf("%s\n", buf); + } + } + return 0; +} + +static int hash_callback(const struct option *opt, const char *arg, int unset) +{ + hash_only = 1; + /* Use full length SHA1 if no argument */ + if (!arg) + return 0; + return parse_opt_abbrev_cb(opt, arg, unset); +} + +static int exclude_existing_callback(const struct option *opt, const char *arg, + int unset) +{ + BUG_ON_OPT_NEG(unset); + exclude_arg = 1; + *(const char **)opt->value = arg; + return 0; +} + +static const struct option show_ref_options[] = { + OPT_BOOL(0, "tags", &tags_only, N_("only show tags (can be combined with heads)")), + OPT_BOOL(0, "heads", &heads_only, N_("only show heads (can be combined with tags)")), + OPT_BOOL(0, "verify", &verify, N_("stricter reference checking, " + "requires exact ref path")), + OPT_HIDDEN_BOOL('h', NULL, &show_head, + N_("show the HEAD reference, even if it would be filtered out")), + OPT_BOOL(0, "head", &show_head, + N_("show the HEAD reference, even if it would be filtered out")), + OPT_BOOL('d', "dereference", &deref_tags, + N_("dereference tags into object IDs")), + { OPTION_CALLBACK, 's', "hash", &abbrev, N_("n"), + N_("only show SHA1 hash using <n> digits"), + PARSE_OPT_OPTARG, &hash_callback }, + OPT__ABBREV(&abbrev), + OPT__QUIET(&quiet, + N_("do not print results to stdout (useful with --verify)")), + { OPTION_CALLBACK, 0, "exclude-existing", &exclude_existing_arg, + N_("pattern"), N_("show refs from stdin that aren't in local repository"), + PARSE_OPT_OPTARG | PARSE_OPT_NONEG, exclude_existing_callback }, + OPT_END() +}; + +int cmd_show_ref(int argc, const char **argv, const char *prefix) +{ + git_config(git_default_config, NULL); + + argc = parse_options(argc, argv, prefix, show_ref_options, + show_ref_usage, 0); + + if (exclude_arg) + return exclude_existing(exclude_existing_arg); + + pattern = argv; + if (!*pattern) + pattern = NULL; + + if (verify) { + if (!pattern) + die("--verify requires a reference"); + while (*pattern) { + struct object_id oid; + + if ((starts_with(*pattern, "refs/") || !strcmp(*pattern, "HEAD")) && + !read_ref(*pattern, &oid)) { + show_one(*pattern, &oid); + } + else if (!quiet) + die("'%s' - not a valid ref", *pattern); + else + return 1; + pattern++; + } + return 0; + } + + if (show_head) + head_ref(show_ref, NULL); + for_each_ref(show_ref, NULL); + if (!found_match) { + if (verify && !quiet) + die("No match"); + return 1; + } + return 0; +} |