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btrfs-progs: print compact help for btrfs

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Running 'btrfs' without arguments will print complete help that spans
a lot of lines and is really helpful. Print only subcommand group
names with short descriptions, similar to what 'git' does.

Signed-off-by: David Sterba <dsterba@suse.cz>
This commit is contained in:
David Sterba 2015-06-08 18:54:04 +02:00
parent 330709ee13
commit add9d7fe4b
3 changed files with 46 additions and 1 deletions
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2
btrfs.c
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@ -230,7 +230,7 @@ int main(int argc, char **argv)
if (!prefixcmp(argv[0], "--"))
argv[0] += 2;
} else {
usage_command_group(&btrfs_cmd_group, 0, 0);
usage_command_group_short(&btrfs_cmd_group);
exit(1);
}
}

1
commands.h
View File

@ -72,6 +72,7 @@ extern const char * const generic_cmd_help_usage[];
void usage(const char * const *usagestr) __attribute__((noreturn));
void usage_command(const struct cmd_struct *cmd, int full, int err);
void usage_command_group(const struct cmd_group *grp, int all, int err);
void usage_command_group_short(const struct cmd_group *grp);
void help_unknown_token(const char *arg, const struct cmd_group *grp) __attribute__((noreturn));
void help_ambiguous_token(const char *arg, const struct cmd_group *grp) __attribute__((noreturn));

44
help.c
View File

@ -160,6 +160,50 @@ static void usage_command_group_internal(const struct cmd_group *grp, int full,
}
}
void usage_command_group_short(const struct cmd_group *grp)
{
const char * const *usagestr = grp->usagestr;
FILE *outf = stdout;
const struct cmd_struct *cmd;
if (usagestr && *usagestr) {
fprintf(outf, "usage: %s\n", *usagestr++);
while (*usagestr)
fprintf(outf, " or: %s\n", *usagestr++);
}
fputc('\n', outf);
fprintf(outf, "Command groups:\n");
for (cmd = grp->commands; cmd->token; cmd++) {
if (cmd->hidden)
continue;
if (!cmd->next)
continue;
fprintf(outf, " %-16s %s\n", cmd->token, cmd->next->infostr);
}
fprintf(outf, "\nCommands:\n");
for (cmd = grp->commands; cmd->token; cmd++) {
if (cmd->hidden)
continue;
if (cmd->next)
continue;
fprintf(outf, " %-16s %s\n", cmd->token, cmd->usagestr[1]);
}
fputc('\n', outf);
fprintf(stderr, "For an overview of a given command use 'btrfs command --help'\n");
fprintf(stderr, "or 'btrfs [command...] --help --full' to print all available options.\n");
fprintf(stderr, "Any command name can be shortened as far as it stays unambiguous,\n");
fprintf(stderr, "however it is recommended to use full command names in scripts.\n");
fprintf(stderr, "All command groups have their manual page named 'btrfs-<group>'.\n");
}
void usage_command_group(const struct cmd_group *grp, int full, int err)
{
const char * const *usagestr = grp->usagestr;