进入目录后执行 bash 函数

发布于 2024-09-11 13:20:37 字数 245 浏览 5 评论 0原文

我想在进入新目录时执行特定的 bash 函数。有些人认为：

alias cd="cd $@ && myfunction"

$@ 在那里不起作用，并且添加反斜杠也没有帮助。我也有点担心弄乱 cd，如果这适用于其他更改目录的命令，例如 pushd 和 popd ，那就太好了。

有更好的别名/命令吗？

原文

I'd like to execute a particular bash function when I enter a new directory. Somethink like:

alias cd="cd $@ && myfunction"

$@ doesn't work there, and adding a backslash doesn't help. I'm also a little worried about messing with cd, and it would be nice if this worked for other commands which changed directory, like pushd and popd.

Any better aliases/commands?

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青朷 2024-09-18 13:20:37

别名不接受参数。你应该使用一个函数。无需在每次发出提示时自动执行它。

function cd () { builtin cd "$@" && myfunction; }

builtin 关键字允许您重新定义 Bash 内置函数，而无需创建递归。引用该参数可以使其在目录名称中有空格的情况下起作用。

Bash 文档说：

对于几乎所有用途，shell 函数都优于别名。

Aliases don't accept parameters. You should use a function. There's no need to execute it automatically every time a prompt is issued.

function cd () { builtin cd "$@" && myfunction; }

The builtin keyword allows you to redefine a Bash builtin without creating a recursion. Quoting the parameter makes it work in case there are spaces in directory names.

The Bash docs say:

For almost every purpose, shell functions are preferred over aliases.

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吻泪 2024-09-18 13:20:37

我能想到的最简单的解决方案就是这个

myfunction() {
  if [ "$PWD" != "$MYOLDPWD" ]; then
    MYOLDPWD="$PWD";
    # strut yer stuff here..
  fi
}

export PROMPT_COMMAND=myfunction

，应该可以做到。它将适用于所有命令，并将在显示提示之前触发。

The easiest solution I can come up with is this

myfunction() {
  if [ "$PWD" != "$MYOLDPWD" ]; then
    MYOLDPWD="$PWD";
    # strut yer stuff here..
  fi
}

export PROMPT_COMMAND=myfunction

That ought to do it. It'll work with all commands, and will get triggered before the prompt is displayed.

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你的背包 2024-09-18 13:20:37

还有一些其他版本，包括

我编写的 smartcd，它具有大量功能，包括模板和临时变量保存
ondir，更小，更简单

这两个都支持 bash 和 zsh

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野の 2024-09-18 13:20:37

我编写了一个 ZSH 脚本，利用回调函数 chpwd 来获取项目特定的 ZSH 配置。我不确定它是否适用于 Bash，但我认为值得一试。如果它在您要进入的目录中找不到脚本文件，它将检查父目录，直到找到要获取的脚本（或直到到达 /）。当 cd'ing 出目录时，它还会调用一个函数 unmagic，这允许您在离开项目时清理环境。

http://github.com/jkramer/home/blob/master /.zsh/func/magic

“magic”脚本示例：

export BASE=$PWD # needed for another script of mine that allows you to cd into the projects base directory by pressing ^b

ctags -R --languages=Perl $PWD # update ctags file when entering the project directory

export PERL5LIB="$BASE/lib"

# function that starts the catalyst server
function srv {
  perl $BASE/script/${PROJECT_NAME}_server.pl
}

# clean up
function unmagic {
  unfunction src
  unset PERL5LIB
}

I've written a ZSH script utilizing the callback function chpwd to source project specific ZSH configurations. I'm not sure if it works with Bash, but I think it'll be worth a try. If it doesn't find a script file in the directory you're cd'ing into, it'll check the parent directories until it finds a script to source (or until it reaches /). It also calls a function unmagic when cd'ing out of the directory, which allows you to clean up your environment when leaving a project.

http://github.com/jkramer/home/blob/master/.zsh/func/magic

Example for a "magic" script:

export BASE=$PWD # needed for another script of mine that allows you to cd into the projects base directory by pressing ^b

ctags -R --languages=Perl $PWD # update ctags file when entering the project directory

export PERL5LIB="$BASE/lib"

# function that starts the catalyst server
function srv {
  perl $BASE/script/${PROJECT_NAME}_server.pl
}

# clean up
function unmagic {
  unfunction src
  unset PERL5LIB
}

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