axfer: print help text of transfer subcommand just for common options

This commit adds help text of transfer subcommand.

In this time, backend options are not described. They will be added in
future commits.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/axfer/xfer-options.c b/axfer/xfer-options.c
index 5a68646365eb8f023a585fd0841ac846a5822216..aaa30d53b98ca76f4fb00c465d8dddac91c3c5c4 100644 (file)
--- a/axfer/xfer-options.c
+++ b/axfer/xfer-options.c
@@ -25,6 +25,30 @@ enum no_short_opts {
        OPT_PROCESS_ID_FILE,
 };
 
+static int print_help()
+{
+       printf(
+"Usage:\n"
+"  axfer transfer DIRECTION [ COMMON-OPTIONS ] [ BACKEND-OPTIONS ]\n"
+"\n"
+"  where:\n"
+"    DIRECTION = capture | playback\n"
+"    COMMON-OPTIONS =\n"
+"      -h, --help              help\n"
+"      -v, --verbose           verbose\n"
+"      -q, --quiet             quiet mode\n"
+"      -d, --duration=#        interrupt after # seconds\n"
+"      -s, --samples=#         interrupt after # frames\n"
+"      -f, --format=FORMAT     sample format (case-insensitive)\n"
+"      -c, --channels=#        channels\n"
+"      -r, --rate=#            numeric sample rate in unit of Hz or kHz\n"
+"      -t, --file-type=TYPE    file type (wav, au, sparc, voc or raw, case-insentive)\n"
+"      -I, --separate-channels one file for each channel\n"
+"      --dump-hw-params        dump hw_params of the device\n"
+"      --xfer-type=BACKEND     backend type (libasound, libffado)\n"
+       );
+}
+
 static int allocate_paths(struct xfer_context *xfer, char *const *paths,
                           unsigned int count)
 {
@@ -347,6 +371,11 @@ int xfer_options_parse_args(struct xfer_context *xfer,
        free(l_opts);
        free(s_opts);
 
+       if (xfer->help) {
+               print_help();
+               return 0;
+       }
+
        err = allocate_paths(xfer, argv + optind, argc - optind);
        if (err < 0)
                return err;