Kenneth Benzie (Benie)
ac97157665
Using a hook, automatically detect when `.enter` and `.exit` scripts and source them when changing the shells current directory.
74 lines
2.7 KiB
Bash
74 lines
2.7 KiB
Bash
# Automatically update the environment when the current working directory
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# changes, this is a reimplementation of the ideas found in the repository
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# https://github.com/Tarrasch/zsh-autoenv stripped down to suit my specific
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# needs.
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# Global entered directories array.
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_autoenv_entered=()
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# Source an enter script and add its directory to the global entered
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# directories array.
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_autoenv_enter() {
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local entered=$1
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# If entered has already been sourced, return.
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(( ${+_autoenv_entered[${_autoenv_entered[(i)$entered]}]} )) && return
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# If the enter script is not authorized, return.
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# TODO: _autoenv_authorized $entered/.enter || return
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# Source the enter script.
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source $entered/.enter
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# Add the entered directory to the global entered array.
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_autoenv_entered+=$entered
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}
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# Source an exit script and remove its directory from the global entered
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# directories array.
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_autoenv_exit() {
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local entered=$1
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# If the exit script is not authorized, return.
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# TODO: _autoenv_authorized $entered/.exit || return
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# Source the exit script.
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source $entered/.exit
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# Remove the entered directory from the global entered array.
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_autoenv_entered[${_autoenv_entered[(i)$entered]}]=()
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}
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# Find a directory containing a .enter file by searching up the directory tree
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# starting in the current directory.
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_autoenv_find_enter() {
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local current=$PWD
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# If an enter script is found in the current directory, return it.
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[ -f "$current/.enter" ] && echo $current
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# Loop until an enter script or the root directory is found.
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while true; do
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# Walk up one directory and make the path absolute.
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local next=$current/..; local next=${next:A}
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# If the current directory equals the next directory, return.
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[[ $current == $next ]] && return || local current=$next
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# If an enter script is found in the current directory, return it.
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[ -f $current/.enter ] && echo $current
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done
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}
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# A chpwd hook function which automatically sources enter and exit scripts to
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# setup local environments for directory and its subdirectories.
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_autoenv_chpwd() {
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local entered
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# Loop over the entered directory stack.
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for entered in $_autoenv_entered; do
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# If the the current directory was previously entered then exit.
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# TODO: Verify what this condition expression actually does.
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! [[ $PWD/ == $entered/* ]] && _autoenv_exit $entered
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done
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# Find the nearest enter script directory.
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local enter=`_autoenv_find_enter`
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# If the enter directory exists, enter it.
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[ -d "$enter" ] && _autoenv_enter $enter
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}
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# Register the autoenv chpwd hook.
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autoload -U add-zsh-hook
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add-zsh-hook chpwd _autoenv_chpwd
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# Ensure autoenv is activated in the current directory on first load.
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_autoenv_chpwd
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