Added Help command parameter for displaying only a specific command

components/console/commands.c

@@ -209,15 +209,33 @@ esp_err_t esp_console_run(const char *cmdline, int *cmd_ret)
  return ESP_OK;
 }
 
+static struct {
+ struct arg_str *help_cmd;
+ struct arg_end *end;
+} help_args;
+
 static int help_command(int argc, char **argv)
 {
+ int nerrors = arg_parse(argc, argv, (void **) &help_args);
+
+ if (nerrors != 0) {
+ arg_print_errors(stderr, help_args.end, argv[0]);
+ return 1;
+ }
+
  cmd_item_t *it;
+ size_t len = strlen(help_args.help_cmd->sval[0]);
 
  /* Print summary of each command */
  SLIST_FOREACH(it, &s_cmd_list, next) {
  if (it->help == NULL) {
  continue;
  }
+ if (len > 0 &&
+ (strlen(it->command) != len ||
+ strcmp(help_args.help_cmd->sval[0], it->command) != 0)) {
+ continue;
+ }
  /* First line: command name and hint
  * Pad all the hints to the same column
  */
@@ -240,6 +258,9 @@ static int help_command(int argc, char **argv)
 
 esp_err_t esp_console_register_help_command(void)
 {
+ help_args.help_cmd = arg_str0(NULL, NULL, "<string>", "Name of command");
+ help_args.end = arg_end(1);
+
  esp_console_cmd_t command = {
  .command = "help",
  .help = "Print the list of registered commands",