unitproc/bkt-get_path_hierarchy_level

   1 #!/bin/bash
   2 get_path_hierarchy_level() {
   3     # Desc: Outputs hierarchy level of input paths
   4     # Example: $ cat lines.txt | get_path_hierarchy_level
   5     # Input: stdin    str  lines with /-delimited paths
   6     # Output: stdout  int  hierarchy level of each path
   7     # Version: 0.0.1
   8
   9     local line level;
  10     local flag_root;
  11     local -a output;
  12
  13     n=0;
  14     while read -r line; do
  15         # Check for mixed absolute/relative paths.
  16         if [[ $n -le 0 ]] && [[ "$line" =~ ^/ ]]; then
  17             flag_root=true;
  18         else
  19             flag_root=false;
  20         fi;
  21         if { [[ "$flag_root" == "true" ]] && [[ ! "$line" =~ ^/ ]]; } || \
  22            { [[ "$flag_root" == "false" ]] && [[ "$line" =~ ^/ ]]; } then
  23             echo "FATAL:Mixed relative and absolute paths not supported." 1>&2; return 1;
  24         fi;
  25
  26         # Squeeze multiple slashes and remove trailing slashes
  27         line="$(echo "$line" | tr -s '/' | sed 's:/*$::' )";
  28
  29         # Count the number of slashes to determine hierarchy level
  30         level="$(echo "$line" | awk -F'/' '{print NF-1}' )";
  31         if [[ "$flag_root" == "true" ]]; then ((level--)); fi;
  32
  33         # Append to output
  34         output+=("$level");
  35         #declare -p flag_root level; # debug
  36         ((n++));
  37     done;
  38     # Print output
  39     printf "%s\n" "${output[@]}";
  40 }; # return hierarchy level of lines as integers
  41
  42 # Test the function with the provided lines
  43 printf "\n\n========Test 1========\n"
  44 input_lines=(
  45     "foo"
  46     "foo/"
  47     "foo/bar"
  48     "foo/bar/"
  49     "foo/bar///"
  50     "foo///bar"
  51     "/foo/bar/baz"
  52     "/foo/bar/baz/"
  53     "//foo/bar/baz////"
  54 );
  55
  56 printf "%s\n" "${input_lines[@]}";
  57 printf "========Test 1 results:========\n";
  58 # Convert array to newline-separated string and pass to function
  59 printf "%s\n" "${input_lines[@]}" | get_path_hierarchy_level
  60
  61 printf "\n\n========Test 2========\n"
  62 input_lines=(
  63     "foo"
  64     "foo/"
  65     "foo/bar"
  66     "foo/bar/"
  67     "foo/bar///"
  68     "foo///bar"
  69     "foo/bar/baz"
  70     "foo/bar/baz/"
  71     "foo/bar/baz////"
  72 );
  73
  74 printf "%s\n" "${input_lines[@]}";
  75 printf "========Test 2 results:========\n";
  76 # Convert array to newline-separated string and pass to function
  77 printf "%s\n" "${input_lines[@]}" | get_path_hierarchy_level