starship/docs/advanced-config/README.md

# Advanced Configuration

While Starship is a versatile shell, sometimes you need to do more than edit
`starship.toml` to get it to do certain things. This page details some of the more
advanced configuration techniques used in starship.

::: warning

The configurations in this section are subject to change in future releases of Starship.

:::

## Custom pre-prompt and pre-execution Commands in Cmd

Clink provides extremely flexible APIs to run pre-prompt and pre-exec commands
in Cmd shell. It is fairly simple to use with Starship. Make the following changes
to your `starship.lua` file as per your requirements:

- To run a custom function right before the prompt is drawn, define a new
  function called `starship_preprompt_user_func`. This function receives
  the current prompt as a string that you can utilize. For example, to
  draw a rocket before the prompt, you would do

```lua
function starship_preprompt_user_func(prompt)
  print("🚀")
end

load(io.popen('starship init cmd'):read("*a"))()
```

- To run a custom function right before a command is executed, define a new
  function called `starship_precmd_user_func`. This function receives
  the current commandline as a string that you can utilize. For example, to
  print the command that's about to be executed, you would do

```lua
function starship_precmd_user_func(line)
  print("Executing: "..line)
end

load(io.popen('starship init cmd'):read("*a"))()
```

## Custom pre-prompt and pre-execution Commands in Bash

Bash does not have a formal preexec/precmd framework like most other shells.
Because of this, it is difficult to provide fully customizable hooks in `bash`.
However, Starship does give you limited ability to insert your own functions
into the prompt-rendering procedure:

- To run a custom function right before the prompt is drawn, define a new
  function and then assign its name to `starship_precmd_user_func`. For example,
  to draw a rocket before the prompt, you would do

```bash
function blastoff(){
    echo "🚀"
}
starship_precmd_user_func="blastoff"
```

- To run a custom function right before a command runs, you can use the
  [`DEBUG` trap mechanism](https://jichu4n.com/posts/debug-trap-and-prompt_command-in-bash/).
  However, you **must** trap the DEBUG signal _before_ initializing Starship!
  Starship can preserve the value of the DEBUG trap, but if the trap is overwritten
  after starship starts up, some functionality will break.

```bash
function blastoff(){
    echo "🚀"
}
trap blastoff DEBUG     # Trap DEBUG *before* running starship
set -o functrace
eval $(starship init bash)
set +o functrace
```

## Custom pre-prompt and pre-execution Commands in PowerShell

PowerShell does not have a formal preexec/precmd framework like most other shells.
Because of this, it is difficult to provide fully customizable hooks in `powershell`.
However, Starship does give you limited ability to insert your own functions
into the prompt-rendering procedure:

Create a function named `Invoke-Starship-PreCommand`

```powershell
function Invoke-Starship-PreCommand {
    $host.ui.Write("🚀")
}
```

## Change Window Title

Some shell prompts will automatically change the window title for you (e.g. to
reflect your working directory). Fish even does it by default.
Starship does not do this, but it's fairly straightforward to add this
functionality to `bash`, `zsh`, `cmd` or `powershell`.

First, define a window title change function (identical in bash and zsh):

```bash
function set_win_title(){
    echo -ne "\033]0; YOUR_WINDOW_TITLE_HERE \007"
}
```

You can use variables to customize this title (`$USER`, `$HOSTNAME`, and `$PWD`
are popular choices).

In `bash`, set this function to be the precmd starship function:

```bash
starship_precmd_user_func="set_win_title"
```

In `zsh`, add this to the `precmd_functions` array:

```bash
precmd_functions+=(set_win_title)
```

If you like the result, add these lines to your shell configuration file
(`~/.bashrc` or `~/.zshrc`) to make it permanent.

For example, if you want to display your current directory in your terminal tab title,
add the following snippet to your `~/.bashrc` or `~/.zshrc`:

```bash
function set_win_title(){
    echo -ne "\033]0; $(basename "$PWD") \007"
}
starship_precmd_user_func="set_win_title"
```

For Cmd, you can change the window title using the `starship_preprompt_user_func` function.

```lua
function starship_preprompt_user_func(prompt)
  console.settitle(os.getenv('USERNAME').."@"..os.getenv('COMPUTERNAME')..": "..os.getcwd())
end

load(io.popen('starship init cmd'):read("*a"))()
```

You can also set a similar output with PowerShell by creating a function named `Invoke-Starship-PreCommand`.

```powershell
# edit $PROFILE
function Invoke-Starship-PreCommand {
  $host.ui.Write("`e]0; PS> $env:USERNAME@$env:COMPUTERNAME`: $pwd `a")
}

Invoke-Expression (&starship init powershell)
```

## Enable Right Prompt

Some shells support a right prompt which renders on the same line as the input. Starship can
set the content of the right prompt using the `right_format` option. Any module that can be used
in `format` is also supported in `right_format`. The `$all` variable will only contain modules
not explicitly used in either `format` or `right_format`.

Note: The right prompt is a single line following the input location. To right align modules above
the input line in a multi-line prompt, see the [fill module](/config/#fill).

`right_format` is currently supported for the following shells: elvish, fish, zsh, xonsh, cmd.

### Example

```toml
# ~/.config/starship.toml

# A minimal left prompt
format = """$character"""

# move the rest of the prompt to the right
right_format = """$all"""
```

Produces a prompt like the following:

```
▶                                   starship on  rprompt [!] is 📦 v0.57.0 via 🦀 v1.54.0 took 17s
```

## Continuation Prompt

Some shells support a continuation prompt along with the normal prompt. This prompt is rendered instead of the normal prompt when the user has entered an incomplete statement (such as a single left parenthesis or quote).

Starship can set the continuation prompt using the `continuation_prompt` option. The default prompt is `"[∙](bright-black) "`.

Note: `continuation_prompt` should be set to a literal string without any variables.

Note: Continuation prompts are only available in the following shells:

- `bash`
- `zsh`
- `PowerShell`

### Example

```toml
# ~/.config/starship.toml

# A continuation prompt that displays two filled in arrows
continuation_prompt = "▶▶"
```

## Style Strings

Style strings are a list of words, separated by whitespace. The words are not case sensitive (i.e. `bold` and `BoLd` are considered the same string). Each word can be one of the following:

- `bold`
- `italic`
- `underline`
- `dimmed`
- `inverted`
- `bg:<color>`
- `fg:<color>`
- `<color>`
- `none`

where `<color>` is a color specifier (discussed below). `fg:<color>` and `<color>` currently do the same thing, though this may change in the future. `inverted` swaps the background and foreground colors. The order of words in the string does not matter.

The `none` token overrides all other tokens in a string if it is not part of a `bg:` specifier, so that e.g. `fg:red none fg:blue` will still create a string with no styling. `bg:none` sets the background to the default color so `fg:red bg:none` is equivalent to `red` or `fg:red` and `bg:green fg:red bg:none` is also equivalent to `fg:red` or `red`. It may become an error to use `none` in conjunction with other tokens in the future.

A color specifier can be one of the following:

- One of the standard terminal colors: `black`, `red`, `green`, `blue`,
  `yellow`, `purple`, `cyan`, `white`. You can optionally prefix these
  with `bright-` to get the bright version (e.g. `bright-white`).
- A `#` followed by a six-digit hexadecimal number. This specifies an
  [RGB color hex code](https://www.w3schools.com/colors/colors_hexadecimal.asp).
- A number between 0-255. This specifies an [8-bit ANSI Color Code](https://i.stack.imgur.com/KTSQa.png).

If multiple colors are specified for foreground/background, the last one in the string will take priority.