define bash functions on a per-directory basis
make install
installs into /usr/lib/magic
by default.
make PREFIX=/your/prefix install
to install to a different prefix.
make DESTDIR=stage install
for a staged install.
Add the following line to your .bashrc or .zshrc:
source /usr/lib/magic/magic
If you used a different PREFIX
, adjust the path accordingly.
Define some bash functions in a script named .spells
and place it
into the directory below which these functions shall be defined. Be
sure to echo the name of each function you define at the end of the
script.
Upon entering the directory the .spells
file will be sourced and the
functions defined in it will be available at the prompt. Upon leaving
the directory all functions will be unset
again (provided the
.spells
script correctly echoes their names).
Assume you have a directory ~/workspace
under which you store your
git repositories. Create a .spells
file in this directory, defining
a function called get
:
function get() {
local author="$1"
local project="$2"
git clone "https://github.com/${author}/${project}"
}
echo get
Now you can clone a repository from github by cd'ing into
~/workspace
and typing
$ get hbekel magic
This function will only be defined below the ~/workspace
directory.
Assume that ~/.spells
reads
function play {
echo "THE ONLY WINNING MOVE IS NOT TO PLAY"
}
echo play
And that ~/music/.spells
reads
function play {
mplayer "$@"
}
echo play
Anywhere in your home directory play
will echo THE ONLY WINNING MOVE IS NOT TO PLAY
, except below the music
directory, where play foo.mp3
will instead call mplayer foo.mp3
.
More specifically, whenever you change into a directory, the current
path will be searched top down, starting at the root of the
filesystem. Every readable .spells
files encountered along the way
will be sourced immediately. This means that .spells
files further
down the hierarchy can effectively override functions defined in
.spells
files residing higher up in the hierarchy.
If you do something interesting with this, please let me know :)