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104 lines
3.7 KiB
Markdown
104 lines
3.7 KiB
Markdown
# Advanced Configuration
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While Starship is a versatile shell, sometimes you need to do more than edit
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`starship.toml` to get it to do certain things. This page details some of the more
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advanced configuration techniques used in starship.
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::: warning
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The configurations in this section are subject to change in future releases of Starship.
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:::
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## Custom pre-prompt and pre-execution Commands in Bash
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Bash does not have a formal preexec/precmd framework like most other shells.
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Because of this, it is difficult to provide fully customizable hooks in `bash`.
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However, Starship does give you limited ability to insert your own functions
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into the prompt-rendering procedure:
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- To run a custom function right before the prompt is drawn, define a new
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function and then assign its name to `starship_precmd_user_func`. For example,
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to draw a rocket before the prompt, you would do
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```bash
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function blastoff(){
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echo "🚀"
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}
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starship_precmd_user_func="blastoff"
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```
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- To run a custom function right before a command runs, you can use the
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[`DEBUG` trap mechanism](https://jichu4n.com/posts/debug-trap-and-prompt_command-in-bash/).
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However, you **must** trap the DEBUG signal *before* initializing Starship!
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Starship can preserve the value of the DEBUG trap, but if the trap is overwritten
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after starship starts up, some functionality will break.
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```bash
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function blastoff(){
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echo "🚀"
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}
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trap blastoff DEBUG # Trap DEBUG *before* running starship
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eval $(starship init bash)
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```
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## Change Window Title
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Some shell prompts will automatically change the window title for you (e.g. to
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reflect your working directory). Fish even does it by default.
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Starship does not do this, but it's fairly straightforward to add this
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functionality to `bash` or `zsh`.
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First, define a window title change function (identical in bash and zsh):
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```bash
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function set_win_title(){
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echo -ne "\033]0; YOUR_WINDOW_TITLE_HERE \007"
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}
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```
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You can use variables to customize this title (`$USER`, `$HOSTNAME`, and `$PWD`
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are popular choices).
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In `bash`, set this function to be the precmd starship function:
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```bash
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starship_precmd_user_func="set_win_title"
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```
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In `zsh`, add this to the `precmd_functions` array:
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```bash
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precmd_functions+=(set_win_title)
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```
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If you like the result, add these lines to your shell configuration file
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(`~/.bashrc` or `~/.zsrhc`) to make it permanent.
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## Style Strings
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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:
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- `bold`
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- `underline`
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- `dimmed`
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- `bg:<color>`
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- `fg:<color>`
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- `<color>`
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- `none`
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where `<color>` is a color specifier (discussed below). `fg:<color>` and `<color>` currently do the same thing , though this may change in the future. The order of words in the string does not matter.
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The `none` token overrides all other tokens in a string, so that e.g. `fg:red none fg:blue` will still create a string with no styling. It may become an error to use `none` in conjunction with other tokens in the future.
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A color specifier can be one of the following:
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- One of the standard terminal colors: `black`, `red`, `green`, `blue`,
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`yellow`, `purple`, `cyan`, `white`. You can optionally prefix these
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with `bright-` to get the bright version (e.g. `bright-white`).
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- A `#` followed by a six-digit hexadecimal number. This specifies an
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[RGB color hex code](https://www.w3schools.com/colors/colors_hexadecimal.asp).
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- A number between 0-255. This specifies an [8-bit ANSI Color Code](https://i.stack.imgur.com/KTSQa.png).
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If multiple colors are specified for foreground/background, the last one in the string will take priority.
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