check-attr: add an internal check_attr() function

diff --git a/builtin-fmt-merge-msg.c b/builtin-fmt-merge-msg.c
index df02ba7afdd615492361a1897a9dedd6ab233c96..df18f4070f3877ed907476f2179590001ec972b7 100644 (file)
--- a/builtin-fmt-merge-msg.c
+++ b/builtin-fmt-merge-msg.c
@@ -5,8 +5,10 @@
 #include "revision.h"
 #include "tag.h"
 
-static const char *fmt_merge_msg_usage =
-       "git fmt-merge-msg [--log] [--no-log] [--file <file>]";
+static const char * const fmt_merge_msg_usage[] = {
+       "git fmt-merge-msg [--log|--no-log] [--file <file>]",
+       NULL
+};
 
 static int merge_summary;
 
@@ -347,46 +349,35 @@ int fmt_merge_msg(int merge_summary, struct strbuf *in, struct strbuf *out) {
 
 int cmd_fmt_merge_msg(int argc, const char **argv, const char *prefix)
 {
+       const char *inpath = NULL;
+       struct option options[] = {
+               OPT_BOOLEAN(0, "log",     &merge_summary, "populate log with the shortlog"),
+               OPT_BOOLEAN(0, "summary", &merge_summary, "alias for --log"),
+               OPT_STRING('F', "file",   &inpath, "file", "file to read from"),
+               OPT_END()
+       };
+
        FILE *in = stdin;
-       struct strbuf input, output;
+       struct strbuf input = STRBUF_INIT, output = STRBUF_INIT;
        int ret;
 
        git_config(fmt_merge_msg_config, NULL);
-
-       while (argc > 1) {
-               if (!strcmp(argv[1], "--log") || !strcmp(argv[1], "--summary"))
-                       merge_summary = 1;
-               else if (!strcmp(argv[1], "--no-log")
-                               || !strcmp(argv[1], "--no-summary"))
-                       merge_summary = 0;
-               else if (!strcmp(argv[1], "-F") || !strcmp(argv[1], "--file")) {
-                       if (argc < 3)
-                               die ("Which file?");
-                       if (!strcmp(argv[2], "-"))
-                               in = stdin;
-                       else {
-                               fclose(in);
-                               in = fopen(argv[2], "r");
-                               if (!in)
-                                       die("cannot open %s", argv[2]);
-                       }
-                       argc--; argv++;
-               } else
-                       break;
-               argc--; argv++;
+       argc = parse_options(argc, argv, options, fmt_merge_msg_usage, 0);
+       if (argc > 0)
+               usage_with_options(fmt_merge_msg_usage, options);
+
+       if (inpath && strcmp(inpath, "-")) {
+               in = fopen(inpath, "r");
+               if (!in)
+                       die("cannot open %s", inpath);
        }
 
-       if (argc > 1)
-               usage(fmt_merge_msg_usage);
-
-       strbuf_init(&input, 0);
        if (strbuf_read(&input, fileno(in), 0) < 0)
                die("could not read input file %s", strerror(errno));
-       strbuf_init(&output, 0);
 
        ret = fmt_merge_msg(merge_summary, &input, &output);
        if (ret)
                return ret;
-       printf("%s", output.buf);
+       write_in_full(STDOUT_FILENO, output.buf, output.len);
        return 0;
 }