# Command Help

The same as before, you can add help for the commands in the docstrings and the CLI options.

And the `typer.Typer()` application receives a parameter `help` that you can pass with the main help text for your CLI program:

{ docs_src/commands/help/tutorial001_an.py hl[4,9:11,22,26:30,43,47:51,60:62] }

Check it:

    // Check the new help
    $ python main.py --help

    Usage: main.py [OPTIONS] COMMAND [ARGS]...

      Awesome CLI user manager.

    Options:
      --install-completion  Install completion for the current shell.
      --show-completion     Show completion for the current shell, to copy it or customize the installation.
      --help                Show this message and exit.

    Commands:
      create      Create a new user with USERNAME.
      delete      Delete a user with USERNAME.
      delete-all  Delete ALL users in the database.
      init        Initialize the users database.

    // Now the commands have inline help 🎉

    // Check the help for create
    $ python main.py create --help

    Usage: main.py create [OPTIONS] USERNAME

      Create a new user with USERNAME.

    Options:
      --help  Show this message and exit.

    // Check the help for delete
    $ python main.py delete --help

    Usage: main.py delete [OPTIONS] USERNAME

      Delete a user with USERNAME.

      If --force is not used, will ask for confirmation.

    Options:
      --force / --no-force  Force deletion without confirmation.  [required]
      --help                Show this message and exit.

    // Check the help for delete-all
    $ python main.py delete-all --help

    Usage: main.py delete-all [OPTIONS]

      Delete ALL users in the database.

      If --force is not used, will ask for confirmation.

    Options:
      --force / --no-force  Force deletion without confirmation.  [required]
      --help                Show this message and exit.

    // Check the help for init
    $ python main.py init --help

    Usage: main.py init [OPTIONS]

      Initialize the users database.

    Options:
      --help  Show this message and exit.

/// tip

`typer.Typer()` receives several other parameters for other things, we'll see that later.

You will also see how to use "Callbacks" later, and those include a way to add this same help message in a function docstring.

///

## Overwrite command help

You will probably be better adding the help text as a docstring to your functions, but if for some reason you wanted to overwrite it, you can use the `help` function argument passed to `@app.command()`:

{ docs_src/commands/help/tutorial002.py hl[6,14] }

Check it:

    // Check the help
    $ python main.py --help

    // Notice it uses the help passed to @app.command()
    Usage: main.py [OPTIONS] COMMAND [ARGS]...

    Options:
      --install-completion  Install completion for the current shell.
      --show-completion     Show completion for the current shell, to copy
                            it or customize the installation.
      --help                Show this message and exit.

    Commands:
      create  Create a new user with USERNAME.
      delete  Delete a user with USERNAME.

    // It uses "Create a new user with USERNAME." instead of "Some internal utility function to create."

## Deprecate a Command

There could be cases where you have a command in your app that you need to deprecate, so that your users stop using it, even while it's still supported for a while.

You can mark it with the parameter `deprecated=True`:

{ docs_src/commands/help/tutorial003.py hl[14] }

And when you show the `--help` option you will see it's marked as "`deprecated`":

    $ python main.py --help

    <b> </b><font color="#F4BF75"><b>Usage: </b></font><b>main.py [OPTIONS] COMMAND [ARGS]...                  </b>
    <b>                                                                     </b>
    <font color="#A5A5A1">╭─ Options ─────────────────────────────────────────────────────────╮</font>
    <font color="#A5A5A1">│ </font><font color="#A1EFE4"><b>--install-completion</b></font>          Install completion for the current  │
    <font color="#A5A5A1">│                               shell.                              │</font>
    <font color="#A5A5A1">│ </font><font color="#A1EFE4"><b>--show-completion</b></font>             Show completion for the current     │
    <font color="#A5A5A1">│                               shell, to copy it or customize the  │</font>
    <font color="#A5A5A1">│                               installation.                       │</font>
    <font color="#A5A5A1">│ </font><font color="#A1EFE4"><b>--help</b></font>                        Show this message and exit.         │
    <font color="#A5A5A1">╰───────────────────────────────────────────────────────────────────╯</font>
    <font color="#A5A5A1">╭─ Commands ────────────────────────────────────────────────────────╮</font>
    <font color="#A5A5A1">│ </font><font color="#A1EFE4"><b>create       </b></font> Create a user.                                      │
    <font color="#A5A5A1">│ </font><font color="#6B9F98"><b>delete       </b></font> Delete a user.              <font color="#F92672">(deprecated)           </font> │
    <font color="#A5A5A1">╰───────────────────────────────────────────────────────────────────╯</font>

And if you check the `--help` for the deprecated command (in this example, the command `delete`), it also shows it as deprecated:

    $ python main.py delete --help

    <b> </b><font color="#F4BF75"><b>Usage: </b></font><b>main.py delete [OPTIONS] USERNAME                    </b>
    <b>                                                                     </b>
     <font color="#F92672">(deprecated) </font>
     Delete a user.
     This is deprecated and will stop being supported soon.

    <font color="#A5A5A1">╭─ Arguments ───────────────────────────────────────────────────────╮</font>
    <font color="#A5A5A1">│ </font><font color="#F92672">*</font>    username      <font color="#F4BF75"><b>TEXT</b></font>  [default: None] <font color="#A6194C">[required]</font>               │
    <font color="#A5A5A1">╰───────────────────────────────────────────────────────────────────╯</font>
    <font color="#A5A5A1">╭─ Options ─────────────────────────────────────────────────────────╮</font>
    <font color="#A5A5A1">│ </font><font color="#A1EFE4"><b>--help</b></font>          Show this message and exit.                       │
    <font color="#A5A5A1">╰───────────────────────────────────────────────────────────────────╯</font>

## Suggest Commands

As of version 0.20.0, Typer added support for suggesting mistyped command names. This feature is enabled by default, but you can disable it with the parameter `suggest_commands=False`:

{ docs_src/commands/index/tutorial005.py hl[3] }

If a user mistypes a command, they'll see a helpful suggestion:

    $ python main.py crate

    <font color="#C4A000">Usage: </font>main.py [OPTIONS] COMMAND [ARGS]...
    <font color="#AAAAAA">Try </font><font color="#22436D">&apos;main.py </font><font color="#4C6A8A"><b>--help</b></font><font color="#22436D">&apos;</font><font color="#AAAAAA"> for help.</font>
    <font color="#CC0000">╭─ Error ───────────────────────────────────────────────────────────╮</font>
    <font color="#CC0000">│</font> No such command &apos;crate&apos;. Did you mean &apos;create&apos;?                   <font color="#CC0000">│</font>
    <font color="#CC0000">╰───────────────────────────────────────────────────────────────────╯</font>

If there are multiple close matches, Typer will suggest them all. This feature uses Python's built-in `difflib.get_close_matches()` to find similar command names, making your CLI more user-friendly by helping users recover from typos.

## Rich Markdown and Markup

If you have Rich installed as described in Printing and Colors{.internal-link target=_blank}, you can configure your app to enable markup text with the parameter `rich_markup_mode`.

Then you can use more formatting in the docstrings and the `help` parameter for CLI arguments and CLI options. You will see more about it below. 👇

/// info

By default, `rich_markup_mode` is `None` if Rich is not installed, and `"rich"` if it is installed. In the latter case, you can set `rich_markup_mode` to `None` to disable rich text formatting.

///

### Rich Markup

If you set `rich_markup_mode="rich"` when creating the `typer.Typer()` app, you will be able to use Rich Console Markup in the docstring, and even in the help for the CLI arguments and options:

{ docs_src/commands/help/tutorial004_an.py hl[4,10,14:16,21,24,27] }

With that, you can use Rich Console Markup to format the text in the docstring for the command `create`, make the word "`create`" bold and green, and even use an emoji.

You can also use markup in the help for the `username` CLI Argument.

And the same as before, the help text overwritten for the command `delete` can also use Rich Markup, the same in the CLI Argument and CLI Option.

If you run the program and check the help, you will see that Typer uses Rich internally to format the help.

Check the help for the `create` command:

    $ python main.py create --help

    <b> </b><font color="#F4BF75"><b>Usage: </b></font><b>main.py create [OPTIONS] USERNAME                     </b>
    <b>                                                                     </b>
     <font color="#A6E22E"><b>Create</b></font> a new <i>shiny</i> user. ✨
     This requires a <font color="#A5A5A1"><u style="text-decoration-style:single">username</u></font><font color="#A5A5A1">.                                           </font>

    <font color="#A5A5A1">╭─ Arguments ───────────────────────────────────────────────────────╮</font>
    <font color="#A5A5A1">│ </font><font color="#F92672">*</font>    username      <font color="#F4BF75"><b>TEXT</b></font>  The username to be <font color="#A6E22E">created</font>               │
    <font color="#A5A5A1">│                          [default: None]                          │</font>
    <font color="#A5A5A1">│                          </font><font color="#A6194C">[required]                </font>               │
    <font color="#A5A5A1">╰───────────────────────────────────────────────────────────────────╯</font>
    <font color="#A5A5A1">╭─ Options ─────────────────────────────────────────────────────────╮</font>
    <font color="#A5A5A1">│ </font><font color="#A1EFE4"><b>--help</b></font>          Show this message and exit.                       │
    <font color="#A5A5A1">╰───────────────────────────────────────────────────────────────────╯</font>

And check the help for the `delete` command:

    $ python main.py delete --help

    <b> </b><font color="#F4BF75"><b>Usage: </b></font><b>main.py delete [OPTIONS] USERNAME                     </b>
    <b>                                                                     </b>
     <font color="#F92672"><b>Delete</b></font> a user with <i>USERNAME</i>.

    <font color="#A5A5A1">╭─ Arguments ───────────────────────────────────────────────────────╮</font>
    <font color="#A5A5A1">│ </font><font color="#F92672">*</font>    username      <font color="#F4BF75"><b>TEXT</b></font>  The username to be <font color="#F92672">deleted</font>               │
    <font color="#A5A5A1">│                          [default: None]                          │</font>
    <font color="#A5A5A1">│                          </font><font color="#A6194C">[required]                </font>               │
    <font color="#A5A5A1">╰───────────────────────────────────────────────────────────────────╯</font>
    <font color="#A5A5A1">╭─ Options ─────────────────────────────────────────────────────────╮</font>
    <font color="#A5A5A1">│ </font><font color="#A1EFE4"><b>--force</b></font>    <font color="#AE81FF"><b>--no-force</b></font>      Force the <font color="#F92672"><b>deletion</b></font> 💥                  │
    <font color="#A5A5A1">│                            [default: no-force]                    │</font>
    <font color="#A5A5A1">│ </font><font color="#A1EFE4"><b>--help</b></font>                     Show this message and exit.            │
    <font color="#A5A5A1">╰───────────────────────────────────────────────────────────────────╯</font>

### Rich Markdown

If you set `rich_markup_mode="markdown"` when creating the `typer.Typer()` app, you will be able to use Markdown in the docstring:

{ docs_src/commands/help/tutorial005_an.py hl[4,9,12:20,25,27:28] }

With that, you can use Markdown to format the text in the docstring for the command `create`, make the word "`create`" bold, show a list of items, and even use an emoji.

And the same as before, the help text overwritten for the command `delete` can also use Markdown.

Check the help for the `create` command:

    $ python main.py create --help

    <b> </b><font color="#F4BF75"><b>Usage: </b></font><b>main.py create [OPTIONS] USERNAME                     </b>
    <b>                                                                     </b>
     <b>Create</b> a new <i>shiny</i> user. ✨

     <font color="#F4BF75"><b> • </b></font><font color="#A5A5A1">Create a username                                                </font>
     <font color="#F4BF75"><b> • </b></font><font color="#A5A5A1">Show that the username is created                                </font>

     <font color="#F4BF75">───────────────────────────────────────────────────────────────────</font>
     Learn more at the <font color="#44919F">Typer docs website</font>

    <font color="#A5A5A1">╭─ Arguments ───────────────────────────────────────────────────────╮</font>
    <font color="#A5A5A1">│ </font><font color="#F92672">*</font>    username      <font color="#F4BF75"><b>TEXT</b></font>  The username to be <b>created</b>               │
    <font color="#A5A5A1">│                          [default: None]                          │</font>
    <font color="#A5A5A1">│                          </font><font color="#A6194C">[required]                              </font> │
    <font color="#A5A5A1">╰───────────────────────────────────────────────────────────────────╯</font>
    <font color="#A5A5A1">╭─ Options ─────────────────────────────────────────────────────────╮</font>
    <font color="#A5A5A1">│ </font><font color="#A1EFE4"><b>--help</b></font>          Show this message and exit.                       │
    <font color="#A5A5A1">╰───────────────────────────────────────────────────────────────────╯</font>

And the same for the `delete` command:

    $ python main.py delete --help

    <b> </b><font color="#F4BF75"><b>Usage: </b></font><b>main.py delete [OPTIONS] USERNAME                     </b>
    <b>                                                                     </b>
     <b>Delete</b> a user with <i>USERNAME</i>.

    <font color="#A5A5A1">╭─ Arguments ───────────────────────────────────────────────────────╮</font>
    <font color="#A5A5A1">│ </font><font color="#F92672">*</font>    username      <font color="#F4BF75"><b>TEXT</b></font>  The username to be <b>deleted</b>               │
    <font color="#A5A5A1">│                          [default: None]                          │</font>
    <font color="#A5A5A1">│                          </font><font color="#A6194C">[required]                              </font> │
    <font color="#A5A5A1">╰───────────────────────────────────────────────────────────────────╯</font>
    <font color="#A5A5A1">╭─ Options ─────────────────────────────────────────────────────────╮</font>
    <font color="#A5A5A1">│ </font><font color="#A1EFE4"><b>--force</b></font>    <font color="#AE81FF"><b>--no-force</b></font>      Force the <b>deletion</b> 💥                  │
    <font color="#A5A5A1">│                            [default: no-force]                    │</font>
    <font color="#A5A5A1">│ </font><font color="#A1EFE4"><b>--help</b></font>                     Show this message and exit.            │
    <font color="#A5A5A1">╰───────────────────────────────────────────────────────────────────╯</font>

/// info

Notice that in Markdown you cannot define colors. For colors you might prefer to use Rich markup.

///

## Help Panels

If you have many commands or CLI parameters, you might want to show their documentation in different panels when using the `--help` option.

If you installed Rich as described in Printing and Colors{.internal-link target=_blank}, you can configure the panel to use for each command or CLI parameter.

### Help Panels for Commands

To set the panel for a command you can pass the argument `rich_help_panel` with the name of the panel you want to use:

{ docs_src/commands/help/tutorial006.py hl[22,30,38,46] }

Commands without a panel will be shown in the default panel `Commands`, and the rest will be shown in the next panels:

    $ python main.py --help

    <b> </b><font color="#F4BF75"><b>Usage: </b></font><b>main.py [OPTIONS] COMMAND [ARGS]...                   </b>
    <b>                                                                     </b>
    <font color="#A5A5A1">╭─ Options ─────────────────────────────────────────────────────────╮</font>
    <font color="#A5A5A1">│ </font><font color="#A1EFE4"><b>--install-completion</b></font>          Install completion for the current  │
    <font color="#A5A5A1">│                               shell.                              │</font>
    <font color="#A5A5A1">│ </font><font color="#A1EFE4"><b>--show-completion</b></font>             Show completion for the current     │
    <font color="#A5A5A1">│                               shell, to copy it or customize the  │</font>
    <font color="#A5A5A1">│                               installation.                       │</font>
    <font color="#A5A5A1">│ </font><font color="#A1EFE4"><b>--help</b></font>                        Show this message and exit.         │
    <font color="#A5A5A1">╰───────────────────────────────────────────────────────────────────╯</font>
    <font color="#A5A5A1">╭─ Commands ────────────────────────────────────────────────────────╮</font>
    <font color="#A5A5A1">│ </font><font color="#A1EFE4"><b>create          </b></font> <font color="#A6E22E">Create</font> a new user. ✨                            │
    <font color="#A5A5A1">│ </font><font color="#A1EFE4"><b>delete          </b></font> <font color="#F92672">Delete</font> a user. 🔥                                │
    <font color="#A5A5A1">╰───────────────────────────────────────────────────────────────────╯</font>
    <font color="#A5A5A1">╭─ Utils and Configs ───────────────────────────────────────────────╮</font>
    <font color="#A5A5A1">│ </font><font color="#A1EFE4"><b>config  </b></font> <font color="#66D9EF">Configure</font> the system. 🔧                                 │
    <font color="#A5A5A1">│ </font><font color="#A1EFE4"><b>sync    </b></font> <font color="#66D9EF">Synchronize</font> the system or something fancy like that. ♻   │
    <font color="#A5A5A1">╰───────────────────────────────────────────────────────────────────╯</font>
    <font color="#A5A5A1">╭─ Help and Others ─────────────────────────────────────────────────╮</font>
    <font color="#A5A5A1">│ </font><font color="#A1EFE4"><b>help         </b></font> Get <font color="#F4BF75">help</font> with the system. ❓                        │
    <font color="#A5A5A1">│ </font><font color="#A1EFE4"><b>report       </b></font> <font color="#F4BF75">Report</font> an issue. 🐛                                 │
    <font color="#A5A5A1">╰───────────────────────────────────────────────────────────────────╯</font>

### Help Panels for CLI Parameters

The same way, you can configure the panels for CLI arguments and CLI options with `rich_help_panel`.

And of course, in the same application you can also set the `rich_help_panel` for commands.

{ docs_src/commands/help/tutorial007_an.py hl[15,21,27,37] }

Then if you run the application you will see all the CLI parameters in their respective panels.

- First the CLI arguments that don't have a panel name set in a default one named "`Arguments`".
- Next the CLI arguments with a custom panel. In this example named "`Secondary Arguments`".
- After that, the CLI options that don't have a panel in a default one named "`Options`".
- And finally, the CLI options with a custom panel set. In this example named "`Additional Data`".

You can check the `--help` option for the command `create`:

    $ python main.py create --help

    <b> </b><font color="#F4BF75"><b>Usage: </b></font><b>main.py create [OPTIONS] USERNAME [LASTNAME]          </b>
    <b>                                                                     </b>
     <font color="#A6E22E">Create</font> a new user. ✨

    <font color="#A5A5A1">╭─ Arguments ───────────────────────────────────────────────────────╮</font>
    <font color="#A5A5A1">│ </font><font color="#F92672">*</font>    username      <font color="#F4BF75"><b>TEXT</b></font>  The username to create [default: None]   │
    <font color="#A5A5A1">│                          </font><font color="#A6194C">[required]            </font>                   │
    <font color="#A5A5A1">╰───────────────────────────────────────────────────────────────────╯</font>
    <font color="#A5A5A1">╭─ Secondary Arguments ─────────────────────────────────────────────╮</font>
    <font color="#A5A5A1">│   lastname      </font><font color="#A37F4E"><b>[LASTNAME]</b></font>  The last name of the new user         │
    <font color="#A5A5A1">╰───────────────────────────────────────────────────────────────────╯</font>
    <font color="#A5A5A1">╭─ Options ─────────────────────────────────────────────────────────╮</font>
    <font color="#A5A5A1">│ </font><font color="#A1EFE4"><b>--force</b></font>    <font color="#AE81FF"><b>--no-force</b></font>      Force the creation of the user         │
    <font color="#A5A5A1">│                            [default: no-force]                    │</font>
    <font color="#A5A5A1">│ </font><font color="#A1EFE4"><b>--help</b></font>                     Show this message and exit.            │
    <font color="#A5A5A1">╰───────────────────────────────────────────────────────────────────╯</font>
    <font color="#A5A5A1">╭─ Additional Data ─────────────────────────────────────────────────╮</font>
    <font color="#A5A5A1">│ </font><font color="#A1EFE4"><b>--age</b></font>                   <font color="#F4BF75"><b>INTEGER</b></font>  The age of the new user          │
    <font color="#A5A5A1">│                                  [default: None]                  │</font>
    <font color="#A5A5A1">│ </font><font color="#A1EFE4"><b>--favorite-color</b></font>        <font color="#F4BF75"><b>TEXT   </b></font>  The favorite color of the new    │
    <font color="#A5A5A1">│                                  user                             │</font>
    <font color="#A5A5A1">│                                  [default: None]                  │</font>
    <font color="#A5A5A1">╰───────────────────────────────────────────────────────────────────╯</font>

And of course, the `rich_help_panel` can be used in the same way for commands in the same application.

And those panels will be shown when you use the main `--help` option.

    $ python main.py --help

    <b> </b><font color="#F4BF75"><b>Usage: </b></font><b>main.py [OPTIONS] COMMAND [ARGS]...                   </b>
    <b>                                                                     </b>
    <font color="#A5A5A1">╭─ Options ─────────────────────────────────────────────────────────╮</font>
    <font color="#A5A5A1">│ </font><font color="#A1EFE4"><b>--install-completion</b></font>          Install completion for the current  │
    <font color="#A5A5A1">│                               shell.                              │</font>
    <font color="#A5A5A1">│ </font><font color="#A1EFE4"><b>--show-completion</b></font>             Show completion for the current     │
    <font color="#A5A5A1">│                               shell, to copy it or customize the  │</font>
    <font color="#A5A5A1">│                               installation.                       │</font>
    <font color="#A5A5A1">│ </font><font color="#A1EFE4"><b>--help</b></font>                        Show this message and exit.         │
    <font color="#A5A5A1">╰───────────────────────────────────────────────────────────────────╯</font>
    <font color="#A5A5A1">╭─ Commands ────────────────────────────────────────────────────────╮</font>
    <font color="#A5A5A1">│ </font><font color="#A1EFE4"><b>create          </b></font> <font color="#A6E22E">Create</font> a new user. ✨                            │
    <font color="#A5A5A1">╰───────────────────────────────────────────────────────────────────╯</font>
    <font color="#A5A5A1">╭─ Utils and Configs ───────────────────────────────────────────────╮</font>
    <font color="#A5A5A1">│ </font><font color="#A1EFE4"><b>config         </b></font> <font color="#66D9EF">Configure</font> the system. 🔧                          │
    <font color="#A5A5A1">╰───────────────────────────────────────────────────────────────────╯</font>

You can see the custom panel for the commands for "`Utils and Configs`".

## Epilog

If you need, you can also add an epilog section to the help of your commands:

{ docs_src/commands/help/tutorial008.py hl[6] }

And when you check the `--help` option it will look like:

    $ python main.py --help

    <b> </b><font color="#F4BF75"><b>Usage: </b></font><b>main.py [OPTIONS] USERNAME                            </b>
    <b>                                                                     </b>
     <font color="#A6E22E">Create</font> a new user. ✨

    <font color="#A5A5A1">╭─ Arguments ───────────────────────────────────────────────────────╮</font>
    <font color="#A5A5A1">│ </font><font color="#F92672">*</font>    username      <font color="#F4BF75"><b>TEXT</b></font>  [default: None] <font color="#A6194C">[required]</font>               │
    <font color="#A5A5A1">╰───────────────────────────────────────────────────────────────────╯</font>
    <font color="#A5A5A1">╭─ Options ─────────────────────────────────────────────────────────╮</font>
    <font color="#A5A5A1">│ </font><font color="#A1EFE4"><b>--install-completion</b></font>          Install completion for the current  │
    <font color="#A5A5A1">│                               shell.                              │</font>
    <font color="#A5A5A1">│ </font><font color="#A1EFE4"><b>--show-completion</b></font>             Show completion for the current     │
    <font color="#A5A5A1">│                               shell, to copy it or customize the  │</font>
    <font color="#A5A5A1">│                               installation.                       │</font>
    <font color="#A5A5A1">│ </font><font color="#A1EFE4"><b>--help</b></font>                        Show this message and exit.         │
    <font color="#A5A5A1">╰───────────────────────────────────────────────────────────────────╯</font>

     Made with ❤ in <font color="#66D9EF">Venus</font>

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