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utils: add more detailed help message #1813

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utils: add more detailed help message #1813

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106 changes: 106 additions & 0 deletions uftrace.c
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Original file line number Diff line number Diff line change
Expand Up @@ -239,6 +239,64 @@ __used static const char uftrace_help[] =
" Try `man uftrace [COMMAND]' for more information.\n"
"\n";

__used static const char uftrace_record_usage[] =
" COMMAND:\n"
" record Run a program and saves the trace data\n"
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It'd be nice to list available options (only for the subcommand) as well.

"\n";

__used static const char uftrace_replay_usage[] =
" COMMAND:\n"
" replay Show program execution in the trace data\n"
"\n";


__used static const char uftrace_report_usage[] =
" COMMAND:\n"
" report Show performance statistics in the trace data\n"
"\n";


__used static const char uftrace_live_usage[] =
" COMMAND:\n"
" live Do record and replay in a row (default)\n"
"\n";


__used static const char uftrace_info_usage[] =
" COMMAND:\n"
" info Show system and program info in the trace data\n"
"\n";


__used static const char uftrace_dump_usage[] =
" COMMAND:\n"
" dump Show low-level trace data\n"
"\n";


__used static const char uftrace_recv_usage[] =
" COMMAND:\n"
" recv Save the trace data from network\n"
"\n";


__used static const char uftrace_graph_usage[] =
" COMMAND:\n"
" graph Show function call graph in the trace data\n"
"\n";


__used static const char uftrace_script_usage[] =
" COMMAND:\n"
" script Run a script for recorded trace data\n"
"\n";


__used static const char uftrace_tui_usage[] =
" COMMAND:\n"
" tui Show text user interface for graph and report\n"
"\n";

__used static const char uftrace_footer[] =
" Try `uftrace --help' or `man uftrace [COMMAND]' for more information.\n"
"\n";
Expand Down Expand Up @@ -1130,6 +1188,49 @@ static void update_subcmd(struct uftrace_opts *opts, char *cmd)
opts->mode = UFTRACE_MODE_INVALID;
}

static int print_subhelp(int beforekey)
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It should be before_key but I don't know what that means.

{
int retval = -1;
switch (beforekey) {
case UFTRACE_MODE_RECORD:
pr_out(uftrace_record_usage);
break;
case UFTRACE_MODE_REPLAY:
pr_out(uftrace_replay_usage);
break;
case UFTRACE_MODE_REPORT:
pr_out(uftrace_report_usage);
break;
case UFTRACE_MODE_LIVE:
pr_out(uftrace_live_usage);
break;
case UFTRACE_MODE_GRAPH:
pr_out(uftrace_graph_usage);
break;
case UFTRACE_MODE_INFO:
pr_out(uftrace_info_usage);
break;
case UFTRACE_MODE_DUMP:
pr_out(uftrace_dump_usage);
break;
case UFTRACE_MODE_RECV:
pr_out(uftrace_recv_usage);
break;
case UFTRACE_MODE_SCRIPT:
pr_out(uftrace_script_usage);
break;
case UFTRACE_MODE_TUI:
pr_out(uftrace_tui_usage);
break;
case UFTRACE_MODE_INVALID:
default:
retval = -3;
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What the -3 mean?

break;
}

return (retval);
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We don't use parenthesis for return statement.

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@RndelQndel return retval

}

static void parse_opt_file(int *argc, char ***argv, char *filename, struct uftrace_opts *opts)
{
int file_argc;
Expand Down Expand Up @@ -1324,6 +1425,7 @@ static void free_opts(struct uftrace_opts *opts)
static int parse_options(int argc, char **argv, struct uftrace_opts *opts)
{
/* initial option parsing index */
int beforekey = 0;
optind = 1;

while (true) {
Expand All @@ -1335,12 +1437,16 @@ static int parse_options(int argc, char **argv, struct uftrace_opts *opts)
update_subcmd(opts, argv[optind]);

if (opts->mode != UFTRACE_MODE_INVALID) {
beforekey = opts->mode;
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Why not use opts->mode directly?

optind++;
continue;
}
}
break;
}
else if ('h' == (char)key) {
return (print_subhelp(beforekey));
}

tmp = parse_option(opts, key, optarg);
if (tmp < 0)
Expand Down