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tools: Dynamically create the usage help for the commands

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Signed-off-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
This commit is contained in:
Benjamin Tissoires
2015-08-19 13:40:49 -04:00
parent c33e1b1a7e
commit 5bd973a1f1
1 changed files with 38 additions and 13 deletions
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51
tools/ratbag-command.c
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@@ -43,6 +43,15 @@ enum cmd_flags {
FLAG_VERBOSE = 1 << 0,
};
struct ratbag_cmd {
const char *name;
int (*cmd)(struct ratbag *ratbag, uint32_t flags, int argc, char **argv);
const char *args;
const char *help;
};
static const struct ratbag_cmd *ratbag_commands[];
LIBRATBAG_ATTRIBUTE_PRINTF(1, 2)
static inline void
error(const char *format, ...)
@@ -59,16 +68,34 @@ error(const char *format, ...)
static void
usage(void)
{
unsigned i = 0;
int count;
const struct ratbag_cmd *cmd = ratbag_commands[0];
printf("Usage: %s [options] [command] /sys/class/input/eventX\n"
"/path/to/device .... open the given device only\n"
"\n"
"Commands:\n"
" info .... show information about the device's capabilities\n"
"/path/to/device ..... Open the given device only\n"
"\n"
"Commands:\n",
program_invocation_short_name);
while (cmd) {
count = 16 - strlen(cmd->name);
if (cmd->args)
count -= 1 + strlen(cmd->args);
if (count < 4)
count = 4;
printf(" %s%s%s %.*s %s\n",
cmd->name,
cmd->args ? " " : "",
cmd->args ? cmd->args : "",
count, "................", cmd->help);
cmd = ratbag_commands[++i];
}
printf("\n"
"Options:\n"
" --verbose ....... Print debugging output.\n"
" --help .......... Print this help.\n",
program_invocation_short_name);
" --help .......... Print this help.\n");
}
static inline struct udev_device*
@@ -243,18 +270,16 @@ out:
return rc;
}
struct ratbag_cmd {
const char *name;
int (*cmd)(struct ratbag *ratbag, uint32_t flags, int argc, char **argv);
};
const struct ratbag_cmd cmd_info = {
static const struct ratbag_cmd cmd_info = {
.name = "info",
.cmd = ratbag_cmd_info,
.args = NULL,
.help = "Show information about the device's capabilities",
};
static const struct ratbag_cmd *ratbag_commands[] = {
&cmd_info,
NULL,
};
static int
@@ -330,7 +355,7 @@ main(int argc, char **argv)
command = argv[optind++];
ARRAY_FOR_EACH(ratbag_commands, cmd) {
if (!streq((*cmd)->name, command))
if (!*cmd || !streq((*cmd)->name, command))
continue;
argc -= optind;