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# Advanced Configuration
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`Starship 功能繁多,有时您必须在编辑 <code>starship.toml` 之外做更多工作才能实现某些效果。 此页面详细介绍了一些在 starship 中使用的高级配置技巧。
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::: warning
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本节所述的配置内容可能随 Starship 未来版本的更新而改变。
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:::
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## 在 Bash 中自定义预提示和预执行命令
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Bash 没有像大多数其它 shell 一样的正式预执行/预命令框架。 因此,很难在 `bash` 中提供完全可自定义的 hook 机制。 然而, Starship 确实能使您有限地在提示符渲染过程中插入自己的函数执行:
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- 若要在提示符显示之前运行自定义函数,需要定义此函数,然后将函数名赋值给 `starship_reserved_user_func` 。 例如,要在提示符之前绘制一枚火箭,您应该写
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```bash
function blastoff(){
echo "🚀"
}
starship_precmd_user_func="blastoff"
```
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- 要在一个命令运行前运行自定义函数,您可以使用 [`DEBUG` trap 机制 ](https://jichu4n.com/posts/debug-trap-and-prompt_command-in-bash/ )。 然而,您**必须**在捕捉 DEBUG 信号*之前*启动 Starship! Starship 可以保留 DEBUG trap 的值,但如果该 trap 在 starship 启动后被覆盖,一些功能将会被破坏。
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```bash
function blastoff(){
echo "🚀"
}
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trap blastoff DEBUG # 启动 starship *之前* 设置 DEBUG trap
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eval $(starship init bash)
```
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## 更改窗口标题
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一些 shell 提示符会自动更改您的窗口标题(比如改成您的工作目录)。 Fish 甚至默认会执行此功能。 Starship 没有实现此功能,但将这个功能添加到 `bash` 或 `zsh` 是相当简单的。
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首先,定义窗口标题更改函数(在 bash 和 zsh 中相同):
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```bash
function set_win_title(){
echo -ne "\033]0; YOUR_WINDOW_TITLE_HERE \007"
}
```
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您可以使用变量来定制标题(常用的有 `$USER` , `$HOSTNAME` 和 `$PWD` )。
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在 `bash` 中,设置此函数为 starship 预执行函数:
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```bash
starship_precmd_user_func="set_win_title"
```
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在 `zsh` 中,将此函数添加到 `reservmd_functions` 列表:
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```bash
precmd_functions+=(set_win_title)
```
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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"
```
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## 样式设定
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样式字符串是用空格分隔的单词列表。 其中单词不是大小写敏感的(例如 `bold` 和 `BoLd` 被视为同一字符串)。 每个单词可以是以下之一:
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- `bold`
- `underline`
- `dimmed`
- `bg:<color>`
- `fg:<color>`
- `<color>`
- `none`
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`<color>` 是颜色说明符(下面解释)。 `fg:<color>` 和 `<color>` 当前产生一样的效果,尽管未来可能会改变。 字符串中的单词顺序不影响显示结果。
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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.
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颜色说明符可以是以下内容之一:
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- 标准终端颜色之一:`black`, `red`, `green`, `blue`, `yellow`, `purple`, `cyan`, `white`。 您可以使用可选前缀 `bright-` 来获取明亮版本的颜色(例如,`bright-white`)。
- 一个 `#` 后跟一个六位十六进制数。 这将指定一个 [十六进制 RGB 颜色代码 ](https://www.w3schools.com/colors/colors_hexadecimal.asp )。
- 0-255 之间的数字。 这将指定一个 [8 位 ANSI 颜色码 ](https://i.stack.imgur.com/KTSQa.png )。
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如果为文本/背景指定了多个颜色,字符串中最后指定的颜色将具有最高优先级。