unitproc/bkt-get_parent_dirnames

   1 #!/usr/bin/env bash
   2 # Desc: Provides newline-delimited list of each parent dir
   3
   4 yell() { echo "$0: $*" >&2; } # print script path and all args to stderr
   5 die() { yell "$*"; exit 111; } # same as yell() but non-zero exit status
   6 try() { "$@" || die "cannot $*"; } # runs args as command, reports args if command fails
   7 get_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
  33 sleep 1 && get_parent_dirnames /home/baltakatei/Downloads/ & # should work
  34 sleep 2 && get_parent_dirnames /home/baltakatei/Downloads/ foo & # should fail
  35 sleep 3 && get_parent_dirnames bar/baz & # should fail
  36 sleep 4;