# 進階設定

正因為 Starship 是一個多才多藝的 shell，有時候你必須要做比修改 `starship.toml` 更多事情來讓它完成特定工作。 這個頁面說明了一些用於 Starship 的進階設定技巧。

::: warning

這個章節內的設定可能會隨著未來 Starship 的版本發行而變動。

:::

## TransientPrompt in PowerShell

It is possible to replace the previous-printed prompt with a custom string. This is useful in cases where all the prompt information is not always needed. To enable this, run `Enable-TransientPrompt` in the shell session. To make it permanent, put this statement in your `$PROFILE`. Transience can be disabled on-the-fly with `Disable-TransientPrompt`.

By default, the left side of input gets replaced with `>`. To customize this, define a new function called `Invoke-Starship-TransientFunction`. For example, to display Starship's `character` module here, you would do

```powershell
function Invoke-Starship-TransientFunction {
  &starship module character
}

Invoke-Expression (&starship init powershell)

Enable-TransientPrompt
```

## TransientPrompt and TransientRightPrompt in Cmd

Clink allows you to replace the previous-printed prompt with custom strings. This is useful in cases where all the prompt information is not always needed. To enable this, run `clink set prompt.transient <value>` where \<value\> can be one of:

- `always`: always replace the previous prompt
- `same_dir`: replace the previous prompt only if the working directory is same
- `off`: do not replace the prompt (i.e. turn off transience)

You need to do this only once. Make the following changes to your `starship.lua` to customize what gets displayed on the left and on the right:

- By default, the left side of input gets replaced with `>`. To customize this, define a new function called `starship_transient_prompt_func`. This function receives the current prompt as a string that you can utilize. For example, to display Starship's `character` module here, you would do

```lua
function starship_transient_prompt_func(prompt)
  return io.popen("starship module character"
    .." --keymap="..rl.getvariable('keymap')
  ):read("*a")
end
load(io.popen('starship init cmd'):read("*a"))()
```

- By default, the right side of input is empty. To customize this, define a new function called `starship_transient_rprompt_func`. This function receives the current prompt as a string that you can utilize. For example, to display the time at which the last command was started here, you would do

```lua
function starship_transient_rprompt_func(prompt)
  return io.popen("starship module time"):read("*a")
end
load(io.popen('starship init cmd'):read("*a"))()
```

## TransientPrompt and TransientRightPrompt in Fish

It is possible to replace the previous-printed prompt with a custom string. This is useful in cases where all the prompt information is not always needed. To enable this, run `enable_transience` in the shell session. To make it permanent, put this statement in your `~/.config/fish/config.fish`. Transience can be disabled on-the-fly with `disable_transience`.

Note that in case of Fish, the transient prompt is only printed if the commandline is non-empty, and syntactically correct.

- By default, the left side of input gets replaced with a bold-green `❯`. To customize this, define a new function called `starship_transient_prompt_func`. For example, to display Starship's `character` module here, you would do

```fish
function starship_transient_prompt_func
  starship module character
end
starship init fish | source
enable_transience
```

- By default, the right side of input is empty. To customize this, define a new function called `starship_transient_rprompt_func`. For example, to display the time at which the last command was started here, you would do

```fish
function starship_transient_rprompt_func
  starship module time
end
starship init fish | source
enable_transience
```

## TransientPrompt and TransientRightPrompt in Bash

The [Ble.sh](https://github.com/akinomyoga/ble.sh) framework at v0.4 or higher allows you to replace the previous-printed prompt with custom strings. This is useful in cases where all the prompt information is not always needed. To enable this, put this in `~/.bashrc` `bleopt prompt_ps1_transient=<value>`:

The \<value\> here is a colon-separated list of `always`, `same-dir` and `trim`. When `prompt_ps1_final` is empty and the option `prompt_ps1_transient` has a non-empty \<value\>, the prompt specified by `PS1` is erased on leaving the current command line. If \<value\> contains a field `trim`, only the last line of multiline `PS1` is preserved and the other lines are erased. Otherwise, the command line will be redrawn as if `PS1=` is specified. When a field `same-dir` is contained in \<value\> and the current working directory is different from the final directory of the previous command line, this option `prompt_ps1_transient` is ignored.

Make the following changes to your `~/.blerc` (or in `~/.config/blesh/init.sh`) to customize what gets displayed on the left and on the right:

- To customize what the left side of input gets replaced with, configure the `prompt_ps1_final` Ble.sh option. For example, to display Starship's `character` module here, you would do

```bash
bleopt prompt_ps1_final='$(starship module character)'
```

- To customize what the right side of input gets replaced with, configure the `prompt_rps1_final` Ble.sh option. For example, to display the time at which the last command was started here, you would do

```bash
bleopt prompt_rps1_final='$(starship module time)'
```

## 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"))()
```

## Bash 中的自定義預提示 (pre-prompt) 與預執行 (pre-execution) 指令

Bash 不像其他大多的 shell 具有正式的預執行/預指令框架。 因為這個原因，很難在 `bash` 中提供能完全自定義的 hook。 然而，Starship 有提供給你有限的能力來插入你自己的函式到渲染提示字元的程序中：

- 為了在畫出提示字元之前執行一個自定義的函式，請定義一個函式，並將它的名稱放入 `starship_precmd_user_func` 之中。 例如，為了要在提示字元前畫出一個火箭，你就要

```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/). 然而，你**必須**在初始化 Starship _之前_ 對 DEBUG 訊號設下trap！ Starship 可以保留 DEBUG trap 的數值，但是如果該 trap 在 starship 啟動後被被覆寫，某些功能會損壞。

```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`. 然而，Starship 有提供給你有限的能力來插入你自己的函式到渲染提示字元的程序中：

Create a function named `Invoke-Starship-PreCommand`

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

## 改變視窗標題

Some shell prompts will automatically change the window title for you (e.g. to reflect your working directory). Fish 甚至預設就會這樣做。 Starship does not do this, but it's fairly straightforward to add this functionality to `bash`, `zsh`, `cmd` or `powershell`.

首先，定義一個改變視窗標題的函式（在 bash 與 zsh 之中都一樣）：

```bash
function set_win_title(){
    echo -ne "\033]0; 你的標題在此 \007"
}
```

你可以利用變數來自定義這個標題（`$USER`、`$HOSTNAME` 與 `$PWD` 是很受歡迎的選項）。

在 `bash` 中，將這個函式設定為 Starship 的預執行函式：

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

在 `zsh` 中，將這個函式加入 `precmd_functions` 陣列：

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

如果你喜歡這個結果，把這幾行加入你的 shell 設定檔中(`~/.bashrc` or `~/.zsrhc`)來將此設為永久設定。

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 {
  $host.ui.RawUI.WindowTitle = "$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, nushell, bash.

Note: The [Ble.sh](https://github.com/akinomyoga/ble.sh) framework v0.4 or higher should be installed in order to use right prompt in bash.

### 範例

```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`

### 範例

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

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

## 風格字串

風格字串是一個以空白分開的單詞清單。 單字並不會區分大小寫（換句話說，`bold` 與 `BoLd` 是被當作兩個相同的字串）。 每個單詞可以是下列其中之一：

- `bold`
- `斜體字`
- `underline`
- `dimmed`
- `inverted`
- `blink`
- `hidden`
- `strikethrough`
- `bg:<color>`
- `fg:<color>`
- `<color>`
- `none`

其中 `<color>` 是指定顏色用的（下面解釋）。 `fg:<color>` and `<color>` currently do the same thing, though this may change in the future. `<color>` can also be set to `prev_fg` or `prev_bg` which evaluates to the previous item's foreground or background color respectively if available or `none` otherwise. `inverted` swaps the background and foreground colors. 單詞在字串中的順序不重要。

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`. 未來可能會將 `none` 與其他符號一起使用的情形視為是一種錯誤。

一個顏色指定符號可以是下列其中之一：

- 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`).
- 一個 `#` 後面跟隨著六位數的十六進位數字。 這個指定了 [RGB 十六進制色碼](https://www.w3schools.com/colors/colors_hexadecimal.asp)。
- 一個介於 0~255 之間的數字。 這個指定了 [8-bit ANSI 色碼](https://i.stack.imgur.com/KTSQa.png)。

如果前景/後景被指定了多種顏色，最後一個顏色具有最高優先性。

Not every style string will be displayed correctly by every terminal. In particular, the following known quirks exist:

- Many terminals disable support for `blink` by default.
- `hidden` is [not supported on iTerm](https://gitlab.com/gnachman/iterm2/-/issues/4564).
- `strikethrough` is not supported by the default macOS Terminal.app.
