feat(unitproc/palign.sh):Add script to align path lists
[BK-2020-03.git] / unitproc / bkt-get_parent_dirnames
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1#!/usr/bin/env bash
2# Desc: Provides newline-delimited list of each parent dir
3
4yell() { echo "$0: $*" >&2; } # print script path and all args to stderr
5die() { yell "$*"; exit 111; } # same as yell() but non-zero exit status
6try() { "$@" || die "cannot $*"; } # runs args as command, reports args if command fails
7get_parent_dirnames() {
8 # Desc: Provides newline-delimited list of each parent dir of a file or dir
9 # Usage: get_parent_dirnames arg1
10 # Input: arg1 input path
11 # Output: stdout newline-delimited list of parent dirs
12 # Version: 0.0.1
13 # Depends: yell(), die(), try()
14 local path
15
16 # Check input
17 if [[ $# -ne 1 ]]; then die "FATAL:Incorrect number of arguments:$#"; fi;
18 if ! { [[ -f $1 ]] || [[ -d $1 ]]; }; then die "FATAL:Not a file or dir:$1"; fi;
19
20 # Process path
21 path="$1";
22 while [[ -f $path ]] || [[ -d $path ]]; do
23 path="$(dirname "$path")";
24 name_base_previous="$name_base";
25 name_base="$(basename "$path")";
26 ## Check for stop condition (dirname returns same result as previous iteration)
27 if [[ $name_base == "$name_base_previous" ]]; then break; fi;
28 echo "$name_base";
29 done;
30}; # Output parent dirnames to stdout
31
32# Test code
33sleep 1 && get_parent_dirnames /home/baltakatei/Downloads/ & # should work
34sleep 2 && get_parent_dirnames /home/baltakatei/Downloads/ foo & # should fail
35sleep 3 && get_parent_dirnames bar/baz & # should fail
36sleep 4;