describe: when failing, tell the user about options that work

diff --git a/builtin-tag.c b/builtin-tag.c
index e54443009420d98dc281285e997b32f2a263b996..c4790185ebb9979a6772cf7159d16c2a1deeeaf3 100644 (file)
--- a/builtin-tag.c
+++ b/builtin-tag.c
@@ -308,8 +308,7 @@ static void create_tag(const unsigned char *object, const char *tag,
                path = git_pathdup("TAG_EDITMSG");
                fd = open(path, O_CREAT | O_TRUNC | O_WRONLY, 0600);
                if (fd < 0)
-                       die("could not create file '%s': %s",
-                                               path, strerror(errno));
+                       die_errno("could not create file '%s'", path);
 
                if (!is_null_sha1(prev))
                        write_tag_body(fd, prev);
@@ -376,8 +375,8 @@ int cmd_tag(int argc, const char **argv, const char *prefix)
        struct commit_list *with_commit = NULL;
        struct option options[] = {
                OPT_BOOLEAN('l', NULL, &list, "list tag names"),
-               { OPTION_INTEGER, 'n', NULL, &lines, NULL,
-                               "print n lines of each tag message",
+               { OPTION_INTEGER, 'n', NULL, &lines, "n",
+                               "print <n> lines of each tag message",
                                PARSE_OPT_OPTARG, NULL, 1 },
                OPT_BOOLEAN('d', NULL, &delete, "delete tags"),
                OPT_BOOLEAN('v', NULL, &verify, "verify tags"),
@@ -387,11 +386,11 @@ int cmd_tag(int argc, const char **argv, const char *prefix)
                                        "annotated tag, needs a message"),
                OPT_CALLBACK('m', NULL, &msg, "msg",
                             "message for the tag", parse_msg_arg),
-               OPT_STRING('F', NULL, &msgfile, "file", "message in a file"),
+               OPT_FILENAME('F', NULL, &msgfile, "message in a file"),
                OPT_BOOLEAN('s', NULL, &sign, "annotated and GPG-signed tag"),
                OPT_STRING('u', NULL, &keyid, "key-id",
                                        "use another key to sign the tag"),
-               OPT_BOOLEAN('f', NULL, &force, "replace the tag if exists"),
+               OPT_BOOLEAN('f', "force", &force, "replace the tag if exists"),
 
                OPT_GROUP("Tag listing options"),
                {
@@ -405,8 +404,7 @@ int cmd_tag(int argc, const char **argv, const char *prefix)
 
        git_config(git_tag_config, NULL);
 
-       argc = parse_options(argc, argv, options, git_tag_usage, 0);
-       msgfile = parse_options_fix_filename(prefix, msgfile);
+       argc = parse_options(argc, argv, prefix, options, git_tag_usage, 0);
 
        if (keyid) {
                sign = 1;
@@ -444,11 +442,11 @@ int cmd_tag(int argc, const char **argv, const char *prefix)
                else {
                        if (!strcmp(msgfile, "-")) {
                                if (strbuf_read(&buf, 0, 1024) < 0)
-                                       die("cannot read %s", msgfile);
+                                       die_errno("cannot read '%s'", msgfile);
                        } else {
                                if (strbuf_read_file(&buf, msgfile, 1024) < 0)
-                                       die("could not open or read '%s': %s",
-                                               msgfile, strerror(errno));
+                                       die_errno("could not open or read '%s'",
+                                               msgfile);
                        }
                }
        }