2 # I, Ian Kelling, follow the GNU license recommendations at
3 # https://www.gnu.org/licenses/license-recommendations.en.html. They
4 # recommend that small programs, < 300 lines, be licensed under the
5 # Apache License 2.0. This file contains or is part of one or more small
6 # programs. If a small program grows beyond 300 lines, I plan to switch
9 # Copyright 2024 Ian Kelling
11 # Licensed under the Apache License, Version 2.0 (the "License");
12 # you may not use this file except in compliance with the License.
13 # You may obtain a copy of the License at
15 # http://www.apache.org/licenses/LICENSE-2.0
17 # Unless required by applicable law or agreed to in writing, software
18 # distributed under the License is distributed on an "AS IS" BASIS,
19 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
20 # See the License for the specific language governing permissions and
21 # limitations under the License.
25 # avoiding bashisms so it can be used in edge cases where I don't have bash,
26 # however, I'm not super confident that I've avoided them all
29 local help="usage: path_add [options] PATH...
31 --end: adds to end of path, which will give it lowest priority
32 --ifexists: add to path only if directory exists"
33 local found x y ifexists end loop newpath
37 # portable substring matching is ugly http://mywiki.wooledge.org/BashFAQ/041
41 if [ "$1" = --end ]; then
43 elif [ "$1" = --ifexists ]; then
45 elif [ "$1" = --help ]; then
56 # if we arent passed a PATH, just return 0 for convenience
61 # build up the path without the components we want to add
64 if [ "$x" = "$y" ]; then
71 if [ ! "$newpath" ]; then
82 if ! $ifexists ||
[ -d "$x" ]; then
83 if [ ! "$PATH" ]; then