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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 $PATH correctly
# and safely. Originally added as a dependency for other routines, currently
# are unused. TODO: remove?
path_add() (
set -o errexit -o nounset -o pipefail
shopt -s inherit_errexit 2> /dev/null || true
shopt -s lastpipe
local prepend=
if [ "$#" -gt 0 ] && [ "$1" == --prepend ]; then
shift
prepend=y
fi
[ "$#" -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 uniq_paths
local -a new_paths current_paths
for path in ${src_list[@]+"${src_list[@]}"}; do
[ -n "${uniq_paths[$path]+x}" ] && continue
uniq_paths[$path]=1
new_paths+=("$path")
done
if [ -n "${PATH-}" ]; then
str_split -z -- "${PATH-}" ':' | xargs -0 -- readlink -z --canonicalize-missing -- | while IFS= read -d '' -r path; do
[ -n "${uniq_paths[$path]+x}" ] && continue
uniq_paths[$path]=1
current_paths+=("$path")
done
fi
local -a result
[ -n "$prepend" ] && result+=(${new_paths[@]+"${new_paths[@]}"})
result+=(${current_paths[@]+"${current_paths[@]}"})
[ -z "$prepend" ] && result+=(${new_paths[@]+"${new_paths[@]}"})
str_join ':' ${result[@]+"${result[@]}"}
)
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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