#!/bin/sh
set -eu

usage() {
	cat <<-'EOF'
		Usage:
		  bins
		  bins -h
	EOF
}

help() {
	cat <<-'EOF'

		Options:
		  -h, --help    show this message


		List the available binaries in $PATH.  The result is cached on
		the $XDG_CACHE_HOME/euandreh/bins file if $PATH values didn't
		change.


		Examples:

		  Pick an executable using `dmenu`:

		    $ bins | dmenu
	EOF
}


for flag in "$@"; do
	case "$flag" in
		--)
			break
			;;
		--help)
			usage
			help
			exit
			;;
		*)
			;;
	esac
done

while getopts 'h' flag; do
	case "$flag" in
		h)
			usage
			help
			exit
			;;
		*)
			usage >&2
			exit 2
			;;
	esac
done
shift $((OPTIND- 1))


F="$XDG_CACHE_HOME/euandreh/bins"

IFS=:
# Word-splitting is the goal:
# shellcheck disable=2086
if stest -rdq -n "$F" $PATH; then
	trap 'rm -f $F-tmp' EXIT
	stest -lxf $PATH | sort -u > "$F"-tmp
	mv "$F"-tmp "$F"
fi

cat "$F"