118 lines
4 KiB
Plaintext
118 lines
4 KiB
Plaintext
|
# This script applies local configuration changes from the start of your
|
||
|
|
# file hierarchy tree down to your current working directory.
|
||
|
|
#
|
||
|
|
# When you change dirctories it automatically undoes those changes by using
|
||
|
|
# the command contained in the associative array `__undo_commands` starting by
|
||
|
|
# the ones furthest down until the common ancestor with your current
|
||
|
|
#
|
||
|
|
# The '.localrc' files should add an undo command to __undo_commands which is
|
||
|
|
# keyed with the '__UNDO_DIR' variable (i.e: __undo_commands[$__UNDO_DIR]='...')
|
||
|
|
# This variable will be eval-ed to undo your local changes.
|
||
|
|
#
|
||
|
|
# Example 1: a project that needs to have the PATH pre-pended
|
||
|
|
#
|
||
|
|
# # Taking advantage of PATH being expanded when sourcing the file
|
||
|
|
# __undo_commands[$__UNDO_DIR]="export PATH='$PATH'"
|
||
|
|
# export PATH="$__UNDO_DIR/bin:$PATH"
|
||
|
|
#
|
||
|
|
# Example 2: a project that needs to activate a virtualenv
|
||
|
|
#
|
||
|
|
# __undo_commands[$__UNDO_DIR]='deactivate'
|
||
|
|
# source env/bin/activate
|
||
|
|
|
||
|
|
# Contains the commands to undo the changes made in a directory
|
||
|
|
declare -A __undo_commands
|
||
|
|
# Contains the PWD of the previous command (and not $OLDPWD)
|
||
|
|
__LAST_PWD='/'
|
||
|
|
# Declare this variable to print some debug information
|
||
|
|
#DEBUG_LOCALRC=toto
|
||
|
|
|
||
|
|
# Source localrc files from "$1" and its parents unless we find "$2" and stop
|
||
|
|
function __source_localrc_files_rec() {
|
||
|
|
# "$1" and "$2" should not have any trailing slashes unless they are '/'
|
||
|
|
if [ "$1" != "$2" ]; then
|
||
|
|
# FIXME: condition should be unnecessary, but is there to avoid loops
|
||
|
|
[ "$1" != '/' ] && __source_localrc_files_rec "$(dirname "$1")" "$2"
|
||
|
|
|
||
|
|
# Export the special '__UNDO_DIR' variable to key into '__undo_commands'
|
||
|
|
export __UNDO_DIR="$1"
|
||
|
|
local localrc="$1/.localrc"
|
||
|
|
# The post-fix traversal sourced the parent before the child
|
||
|
|
if [ -r "$localrc" ]; then
|
||
|
|
source "$localrc"
|
||
|
|
|
||
|
|
if [ -n "${DEBUG_LOCALRC+set}" ]; then
|
||
|
|
echo "sourced $localrc with __UNDO_DIR as '$__UNDO_DIR'"
|
||
|
|
fi
|
||
|
|
fi
|
||
|
|
unset -v __UNDO_DIR
|
||
|
|
fi
|
||
|
|
}
|
||
|
|
|
||
|
|
# Undo the changes made by "$1" and its parents unless we find "$2" and stop
|
||
|
|
function __undo_localrc_changes() {
|
||
|
|
# Undo the changes for our parent directory if we aren't at the common root
|
||
|
|
if [ "$1" != "$2" ]; then
|
||
|
|
# If there is a command to undo the changes for that directory, do it
|
||
|
|
[ -n "${DEBUG_LOCALRC+set}" ] && echo "Looking at undoing $1"
|
||
|
|
if [ -n "${__undo_commands[$1]+set}" ]; then
|
||
|
|
eval "${__undo_commands[$1]}"
|
||
|
|
|
||
|
|
[ -n "${DEBUG_LOCALRC+set}" ] && echo "undid $1/.localrc"
|
||
|
|
fi
|
||
|
|
|
||
|
|
# FIXME: condition should be unnecessary, but is there to avoid loops
|
||
|
|
[ "$1" != '/' ] && __undo_localrc_changes "$(dirname "$1")" "$2"
|
||
|
|
fi
|
||
|
|
}
|
||
|
|
|
||
|
|
# Return the closest common parent directory of "$1" and "$2"
|
||
|
|
function common_parent() {
|
||
|
|
local directories=("$1")
|
||
|
|
|
||
|
|
while [ "${directories[-1]}" != '/' ]; do
|
||
|
|
directories+=("$(dirname "${directories[-1]}")")
|
||
|
|
done
|
||
|
|
|
||
|
|
for candidate in "${directories[@]}"; do
|
||
|
|
case "$2" in
|
||
|
|
"$candidate"*) printf "%s" "$candidate"; break;;
|
||
|
|
esac
|
||
|
|
done
|
||
|
|
}
|
||
|
|
|
||
|
|
function __source_localrc_files() {
|
||
|
|
# Only do it if we changed our directory since the last command
|
||
|
|
if [ "$__LAST_PWD" = "$PWD" ]; then
|
||
|
|
return 0
|
||
|
|
fi
|
||
|
|
|
||
|
|
# Find the closest common parent directory
|
||
|
|
local parent='/'
|
||
|
|
if [ -n "$__LAST_PWD" ]; then
|
||
|
|
parent=$(common_parent "$__LAST_PWD" "$PWD")
|
||
|
|
fi
|
||
|
|
|
||
|
|
if [ -n "${DEBUG_LOCALRC+set}" ]; then
|
||
|
|
echo "DEBUG"
|
||
|
|
echo "LAST: $__LAST_PWD"
|
||
|
|
echo "CUR: $PWD"
|
||
|
|
echo "PARENT: $parent"
|
||
|
|
fi
|
||
|
|
|
||
|
|
__undo_localrc_changes "$__LAST_PWD" "$parent"
|
||
|
|
__source_localrc_files_rec "$PWD" "$parent"
|
||
|
|
|
||
|
|
# Update our last seen working directory
|
||
|
|
__LAST_PWD="$PWD"
|
||
|
|
}
|
||
|
|
|
||
|
|
# Execute this command every time
|
||
|
|
if [ -n "$BASH_VERSION" ]; then
|
||
|
|
[ -n "${DEBUG_LOCALRC+set}" ] && echo "Loaded Bash"
|
||
|
|
PROMPT_COMMAND="__source_localrc_files; $PROMPT_COMMAND"
|
||
|
|
elif [ -n "$ZSH_VERSION" ]; then
|
||
|
|
[ -n "${DEBUG_LOCALRC+set}" ] && echo "Loaded Zsh"
|
||
|
|
precmd_functions+=( __source_localrc_files)
|
||
|
|
fi
|