message: Add man pages for dir_depth, wait and help
diff: @@ -247,7 +247,16 @@ impl<'a> BuiltinMap<'a> {
  }
  }
  -pub fn builtin_dir_depth(args: &[types::Str], shell: &mut Shell<'_>) -> Status {
  +#[builtin(
  + desc = "set the dir stack depth",
  + man = "
  +SYNOPSYS
  + dir_depth [DEPTH]
  +
  +DESCRIPTION
  + If DEPTH is given, set the dir stack max depth to DEPTH, else remove the limit"
  +)]
  +pub fn dir_depth(args: &[types::Str], shell: &mut Shell<'_>) -> Status {
  let depth = match args.get(1) {
  None => None,
  Some(arg) => match arg.parse::<usize>() {
  @@ -662,8 +671,16 @@ DESCRIPTION
  )]
  pub fn false_(args: &[types::Str], _: &mut Shell<'_>) -> Status { Status::FALSE }
  -// TODO create a manpage
  -pub fn builtin_wait(_: &[types::Str], shell: &mut Shell<'_>) -> Status {
  +#[builtin(
  + desc = "wait for a background job",
  + man = "
  +SYNOPSIS
  + wait
  +
  +DESCRIPTION
  + Wait for the background jobs to finish"
  +)]
  +pub fn wait(args: &[types::Str], shell: &mut Shell<'_>) -> Status {
  let _ = shell.wait_for_background();
  Status::SUCCESS
  }
  @@ -730,7 +747,16 @@ pub fn disown(args: &[types::Str], shell: &mut Shell<'_>) -> Status {
  }
  }
  -pub fn builtin_help(args: &[types::Str], shell: &mut Shell<'_>) -> Status {
  +#[builtin(
  + desc = "get help for builtins",
  + man = "
  +SYNOPSIS
  + help [BUILTIN]
  +
  +DESCRIPTION
  + Get the short description for BUILTIN. If no argument is provided, list all the builtins"
  +)]
  +pub fn help(args: &[types::Str], shell: &mut Shell<'_>) -> Status {
  if let Some(command) = args.get(1) {
  if let Some(help) = shell.builtins().get_help(command) {
  println!("{}", help);
  