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#!/usr/bin/env bash
# Copyright (c) 2016 Egor Tensin <Egor.Tensin@gmail.com>
# This file is part of the "linux-home" project.
# For details, see https://github.com/egor-tensin/linux-home.
# Distributed under the MIT License.
# These are a couple of routines that allow you to add to your $PATH correctly
# and safely. Originally added as a dependency for other routines, currently
# are unused. TODO: remove?
path_add() (
set -o errexit -o nounset -o pipefail
shopt -s inherit_errexit lastpipe
[ "$#" -eq 0 ] && return 0
local -a src_list
local path
readlink -z --canonicalize-missing -- "$@" | while IFS= read -d '' -r path; do
src_list+=("$path")
done
for path; do
if str_contains "$path" ':'; then
echo "${FUNCNAME[0]}: mustn't contain colon (':') characters: $path" >&2
return 1
fi
done
local -A dest_dict
local -a dest_list
for path in ${src_list[@]+"${src_list[@]}"}; do
[ -n "${dest_dict[$path]+x}" ] && continue
dest_dict[$path]=1
dest_list+=("$path")
done
if [ -n "${PATH-}" ]; then
str_split -z -- "${PATH-}" ':' | xargs -0 -- readlink -z --canonicalize-missing -- | while IFS= read -d '' -r path; do
[ -n "${dest_dict[$path]+x}" ] && continue
dest_dict[$path]=1
dest_list+=("$path")
done
fi
str_join ':' ${dest_list[@]+"${dest_list[@]}"}
)
path_export() {
local new_path
local ret
new_path="$( path_add "$@" )"
ret="$?"
[ "$ret" -ne 0 ] && return "$ret"
export PATH="$new_path"
}
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