mirror of
https://github.com/Tarrasch/zsh-autoenv.git
synced 2024-11-05 01:10:59 +02:00
333 lines
8.8 KiB
Bash
333 lines
8.8 KiB
Bash
# Initially based on
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# https://github.com/joshuaclayton/dotfiles/blob/master/zsh_profile.d/autoenv.zsh
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export AUTOENV_ENV_FILENAME=$HOME/.env_auth
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[ -e $AUTOENV_ENV_FILENAME ] || touch $AUTOENV_ENV_FILENAME
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# Name of file to look for when entering directories.
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: ${AUTOENV_FILE_ENTER:=.env}
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# Name of file to look for when leaving directories.
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# Requires AUTOENV_HANDLE_LEAVE=1.
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: ${AUTOENV_FILE_LEAVE:=.env.leave}
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# Look for .env in parent dirs?
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: ${AUTOENV_LOOK_UPWARDS:=1}
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# Handle leave events when changing away from a subtree, where an "enter"
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# event was handled?
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: ${AUTOENV_HANDLE_LEAVE:=1}
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# Enable debugging. Multiple levels are supported (max 2).
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: ${AUTOENV_DEBUG:=0}
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# Public helper functions, which can be used from your .env files:
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#
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# Source the next .env file from parent directories.
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# This is useful if you want to use a base .env file for a directory subtree.
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autoenv_source_parent() {
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local parent_env_file=$(_autoenv_get_file_upwards $PWD)
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if [[ -n $parent_env_file ]] \
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&& _autoenv_check_authorized_env_file $parent_env_file; then
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_autoenv_debug "Calling autoenv_source_parent: parent_env_file:$parent_env_file"
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local parent_env_dir=${parent_env_file:A:h}
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_autoenv_stack_entered_add $parent_env_file
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_autoenv_source $parent_env_file enter $parent_env_dir
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fi
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}
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# Internal functions. {{{
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# Internal: stack of entered (and handled) directories. {{{
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typeset -g -a _autoenv_stack_entered
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_autoenv_stack_entered=()
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# -g: make it global, this is required when used with antigen.
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typeset -g -A _autoenv_stack_entered_mtime
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_autoenv_stack_entered_mtime=()
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# Add an entry to the stack, and remember its mtime.
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_autoenv_stack_entered_add() {
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local env_file=$1
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# Remove any existing entry.
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_autoenv_stack_entered_remove $env_file
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_autoenv_debug "[stack] adding: $env_file" 2
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# Append it to the stack, and remember its mtime.
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_autoenv_stack_entered+=($env_file)
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_autoenv_stack_entered_mtime[$env_file]=$(_autoenv_get_file_mtime $env_file)
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}
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_autoenv_get_file_mtime() {
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if [[ -f $1 ]]; then
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zstat +mtime $1
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else
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echo 0
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fi
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}
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# Remove an entry from the stack.
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_autoenv_stack_entered_remove() {
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local env_file=$1
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_autoenv_debug "[stack] removing: $env_file" 2
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_autoenv_stack_entered[$_autoenv_stack_entered[(i)$env_file]]=()
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_autoenv_stack_entered_mtime[$env_file]=
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}
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# Is the given entry already in the stack?
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_autoenv_stack_entered_contains() {
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local env_file=$1
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if (( ${+_autoenv_stack_entered[(r)${env_file}]} )); then
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# Entry is in stack.
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if [[ $_autoenv_stack_entered_mtime[$env_file] == $(_autoenv_get_file_mtime $env_file) ]]; then
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# Entry has the expected mtime.
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return
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fi
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fi
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return 1
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}
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# }}}
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# Internal function for debug output. {{{
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_autoenv_debug() {
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local msg=$1
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local level=${2:-1}
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if [[ $AUTOENV_DEBUG -lt $level ]]; then
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return
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fi
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# Load zsh color support.
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if [[ -z $color ]]; then
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autoload colors
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colors
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fi
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# Build $indent prefix.
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local indent=
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if [[ $_autoenv_debug_indent -gt 0 ]]; then
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for i in {1..${_autoenv_debug_indent}}; do
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indent=" $indent"
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done
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fi
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# Split $msg by \n (not newline).
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lines=(${(ps:\\n:)msg})
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for line in $lines; do
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echo -n "${fg_bold[blue]}[autoenv]${fg_no_bold[default]} " >&2
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echo ${indent}${line} >&2
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done
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}
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# }}}
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# Load zstat module, but only its builtin `zstat`.
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if ! zmodload -F zsh/stat b:zstat 2>/dev/null; then
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# If the module is not available, define a wrapper around `stat`, and use its
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# terse output instead of format, which is not supported by busybox.
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# Assume '+mtime' as $1.
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zstat() {
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stat -t $2 | cut -f13 -d ' '
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}
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fi
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# Generate hash pair for a given file ($1).
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# A fixed hash value can be given as 2nd arg, but is used with tests only.
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_autoenv_hash_pair() {
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local env_file=${1:A}
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local env_shasum=${2:-}
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if [[ -z $env_shasum ]]; then
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if ! [[ -e $env_file ]]; then
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echo "Missing file argument for _autoenv_hash_pair!" >&2
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return 1
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fi
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env_shasum=$(shasum $env_file | cut -d' ' -f1)
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fi
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echo ":${env_file}:${env_shasum}:1"
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}
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_autoenv_authorized_env_file() {
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local env_file=$1
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local pair=$(_autoenv_hash_pair $env_file)
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test -f $AUTOENV_ENV_FILENAME \
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&& \grep -qF $pair $AUTOENV_ENV_FILENAME
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}
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_autoenv_authorize() {
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local env_file=${1:A}
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_autoenv_deauthorize $env_file
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_autoenv_hash_pair $env_file >>| $AUTOENV_ENV_FILENAME
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}
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# Deauthorize a given filename, by removing it from the auth file.
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# This uses `test -s` to only handle non-empty files, and a subshell to
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# allow for writing to the same file again.
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_autoenv_deauthorize() {
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local env_file=${1:A}
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if [[ -s $AUTOENV_ENV_FILENAME ]]; then
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echo "$(\grep -vF :${env_file}: $AUTOENV_ENV_FILENAME)" >| $AUTOENV_ENV_FILENAME
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fi
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}
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# This function can be mocked in tests
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_autoenv_ask_for_yes() {
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local answer
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read answer
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if [[ $answer == "yes" ]]; then
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return 0
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else
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return 1
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fi
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}
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# Args: 1: absolute path to env file (resolved symlinks).
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_autoenv_check_authorized_env_file() {
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if ! [[ -f $1 ]]; then
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return 1
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fi
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if ! _autoenv_authorized_env_file $1; then
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echo "Attempting to load unauthorized env file!"
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command ls -l $1
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echo ""
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echo "**********************************************"
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echo ""
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cat $1
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echo ""
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echo "**********************************************"
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echo ""
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echo -n "Would you like to authorize it? (type 'yes') "
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if ! _autoenv_ask_for_yes; then
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return 1
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fi
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_autoenv_authorize $1
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fi
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return 0
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}
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# Get directory of this file (absolute, with resolved symlinks).
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_autoenv_source_dir=${0:A:h}
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_autoenv_source() {
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local env_file=$1
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autoenv_event=$2
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local _autoenv_envfile_dir=${3:-${1:A:h}}
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autoenv_from_dir=$_autoenv_chpwd_prev_dir
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autoenv_to_dir=$PWD
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# Source varstash library once.
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if [[ -z "$functions[(I)autostash]" ]]; then
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source $_autoenv_source_dir/lib/varstash
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# NOTE: Varstash uses $PWD as default for varstash_dir, we might set it to
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# ${env_file:h}.
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fi
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# Change to directory of env file, source it and cd back.
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local new_dir=$PWD
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builtin cd -q $_autoenv_envfile_dir
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_autoenv_debug "== SOURCE: ${bold_color:-}$env_file${reset_color:-}\n PWD: $PWD"
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(( _autoenv_debug_indent++ ))
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source $env_file
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(( _autoenv_debug_indent-- ))
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_autoenv_debug "== END SOURCE =="
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builtin cd -q $new_dir
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# Unset vars set for enter/leave scripts.
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# This should not get done for recursion (via autoenv_source_parent),
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# and can be useful to have in general after autoenv was used.
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# unset autoenv_event autoenv_from_dir autoenv_to_dir
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}
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_autoenv_get_file_upwards() {
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local look_from=${1:-$PWD}
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local look_for=${2:-$AUTOENV_FILE_ENTER}
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# Manually look in parent dirs. An extended Zsh glob should use Y1 for
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# performance reasons, which is only available in zsh-5.0.5-146-g9381bb6.
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local last
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local parent_dir="$look_from/.."
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while true; do
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parent_dir=${parent_dir:A}
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if [[ $parent_dir == $last ]]; then
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break
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fi
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parent_file="${parent_dir}/${look_for}"
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if [[ -f $parent_file ]]; then
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echo $parent_file
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break
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fi
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last=$parent_dir
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parent_dir="${parent_dir}/.."
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done
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}
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_autoenv_chpwd_prev_dir=$PWD
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_autoenv_chpwd_handler() {
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local env_file="$PWD/$AUTOENV_FILE_ENTER"
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_autoenv_debug "Calling chpwd handler: PWD=$PWD"
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# Handle leave event for previously sourced env files.
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if [[ $AUTOENV_HANDLE_LEAVE == 1 ]] && (( $#_autoenv_stack_entered )); then
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local prev_file prev_dir
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for prev_file in ${_autoenv_stack_entered}; do
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prev_dir=${prev_file:A:h}
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if ! [[ ${PWD:A}/ == ${prev_dir}/* ]]; then
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local env_file_leave=$prev_dir/$AUTOENV_FILE_LEAVE
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if _autoenv_check_authorized_env_file $env_file_leave; then
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_autoenv_source $env_file_leave leave $prev_dir
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fi
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# Unstash any autostashed stuff.
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varstash_dir=$prev_dir autounstash
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_autoenv_stack_entered_remove $prev_file
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fi
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done
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fi
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if ! [[ -f $env_file ]] && [[ $AUTOENV_LOOK_UPWARDS == 1 ]]; then
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env_file=$(_autoenv_get_file_upwards $PWD)
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if [[ -z $env_file ]]; then
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_autoenv_chpwd_prev_dir=$PWD
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return
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fi
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fi
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# Load the env file only once: check if $env_file is in the stack of entered
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# directories.
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if _autoenv_stack_entered_contains $env_file; then
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_autoenv_debug "Already in stack: $env_file"
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_autoenv_chpwd_prev_dir=$PWD
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return
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fi
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if ! _autoenv_check_authorized_env_file $env_file; then
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_autoenv_chpwd_prev_dir=$PWD
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return
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fi
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_autoenv_stack_entered_add $env_file
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# Source the enter env file.
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_autoenv_debug "Sourcing from chpwd handler: $env_file"
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_autoenv_source $env_file enter
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_autoenv_chpwd_prev_dir=$PWD
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(( _autoenv_debug_indent++ ))
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}
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# }}}
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autoload -U add-zsh-hook
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add-zsh-hook chpwd _autoenv_chpwd_handler
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# Look in current directory already.
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_autoenv_chpwd_handler
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