From: Simon Ruderich Date: Sun, 10 Mar 2013 22:43:39 +0000 (+0100) Subject: lib.sh: Add installed_path(), a portable `which`. X-Git-Url: https://ruderich.org/simon/gitweb/?a=commitdiff_plain;h=4ab86db285a85611695017aed4c36ab1bf9fcd7f;p=config%2Fdotfiles.git lib.sh: Add installed_path(), a portable `which`. --- diff --git a/lib.sh b/lib.sh index d150778..70aefbe 100644 --- a/lib.sh +++ b/lib.sh @@ -27,6 +27,28 @@ unset LS_COLORS installed() { type "$1" >/dev/null 2>&1 } +# Get the path of the given program. Thanks to Gilles on [1] (read on +# 2013-03-10) for the PATH-walking idea. `which` is not portable and `type` +# has no well-formed output format. +# +# [1]: http://unix.stackexchange.com/questions/4988/how-do-i-test-to-see-if-an-application-exists-in-path/4991 +installed_path() { + test -z "$1" && return 1 + + # Keep IFS change local. + ( + IFS=: + # Walk PATH. + for directory in $PATH; do + if test -x "$directory/$1"; then + echo "$directory/$1" + return 0 + fi + done + + return 1 + ) +} # Print the current OS. The following OS are supported at the moment: # - Debian (debian)