unitproc/bkt-get_path_fork_level

   1 #!/bin/bash
   2
   3 get_path_fork_level() {
   4     # Desc: Get fork level from two paths
   5     # Input:  arg1    str  path
   6     #         arg2    str  path
   7     # Output: stdout  int  fork level
   8     # Version: 0.0.1
   9     local path1="$1";
  10     local path2="$2";
  11
  12     # Squeeze multiple slashes and remove trailing slashes
  13     path1="$(echo "$path1" | tr -s '/' | sed 's:/*$::' )";
  14     path2="$(echo "$path2" | tr -s '/' | sed 's:/*$::' )";
  15
  16     # Check for mixed absolute/relative paths
  17     if [[ "$path1" =~ ^/ ]] && [[ "$path2" =~ ^/ ]]; then
  18         flag_root=true;
  19         # Remove initial /
  20         path1="$(echo "$path1" | sed -e 's:^/::' )";
  21         path2="$(echo "$path2" | sed -e 's:^/::' )";
  22     elif [[ ! "$path1" =~ ^/ ]] && [[ ! "$path2" =~ ^/ ]]; then
  23         flag_root=false;
  24     else
  25         declare -p path1 path2 flag_root;
  26         echo "FATAL:Mixed relative and absolute paths not supported." 1>&2;
  27         return 1;
  28     fi;
  29
  30     # Save path as arrays with `/` as element delimiter
  31     local IFS='/';
  32     read -ra parts1 <<< "$path1";
  33     read -ra parts2 <<< "$path2";
  34
  35     # Get fork level by counting identical path elements from rootside
  36     local fork_level=0;
  37     for (( i=0; i<${#parts1[@]} && i<${#parts2[@]}; i++ )); do
  38         if [[ "${parts1[i]}" != "${parts2[i]}" ]]; then break; fi;
  39         ((fork_level++));
  40     done;
  41
  42     echo "$fork_level";
  43     #declare -p path1 path2 flag_root parts1 parts2 fork_level; # debug
  44     return 0;
  45 }; # Get fork level int from two paths
  46
  47 printf "========Test 1========\n";  # fork at 0
  48 p1="foo"; p2="bee"; declare -p p1 p2;
  49 get_path_fork_level "$p1" "$p2";
  50 printf "========Test 2========\n";  # fork at 1
  51 p1="foo"; p2="foo/bar"; declare -p p1 p2;
  52 get_path_fork_level "$p1" "$p2";
  53 printf "========Test 3========\n";  # fork at 1
  54 p1="foo"; p2="foo/bar/"; declare -p p1 p2;
  55 get_path_fork_level "$p1" "$p2";
  56 printf "========Test 4========\n";  # fork at 2
  57 p1="foo/bar/baz"; p2="foo/bar"; declare -p p1 p2;
  58 get_path_fork_level "$p1" "$p2";
  59 printf "========Test 5========\n";  # fork at 2
  60 p1="/foo/bar/baz"; p2="/foo/bar"; declare -p p1 p2;
  61 get_path_fork_level "$p1" "$p2";
  62 printf "========Test 6========\n";  # ERROR: No mixed
  63 p1="foo/bar/baz"; p2="/bee/boo/tax"; declare -p p1 p2;
  64 get_path_fork_level "$p1" "$p2";
  65 printf "========Test 7========\n";  # fork at 0
  66 p1="/foo/bar/baz"; p2="/bee/boo/tax"; declare -p p1 p2;
  67 get_path_fork_level "$p1" "$p2";
  68 printf "========Test 8========\n";  # # ERROR: No mixed
  69 p1="/foo/bar/baz"; p2="foo"; declare -p p1 p2;
  70 get_path_fork_level "$p1" "$p2";
  71 printf "========Test 9========\n";  # fork at 3
  72 p1="foo///////////bar////////baz//////"; p2="foo/////////bar/////////baz///bee"; declare -p p1 p2;
  73 get_path_fork_level "$p1" "$p2";
  74