relpath

• finds the relative path between two paths

•    1 #! /bin/env bash 
     2 
     3 #bash script to find the relative path between two directories
     4 
     5 mydir=${0%/}
     6 mydir=${0%/*}
     7 creadlink="$mydir/creadlink"
     8 
     9 shopt -s extglob
    10 
    11 relpath_ () {
    12         path1=$("$creadlink" "$1")
    13         path2=$("$creadlink" "$2")
    14         orig1=$path1
    15         path1=${path1%/}/
    16         path2=${path2%/}/
    17 
    18         while :; do
    19                 if test ! "$path1"; then
    20                         break
    21                 fi
    22                 part1=${path2#$path1}
    23                 if test "${part1#/}" = "$part1"; then
    24                         path1=${path1%/*}
    25                         continue
    26                 fi
    27                 if test "${path2#$path1}" = "$path2"; then
    28                         path1=${path1%/*}
    29                         continue
    30                 fi
    31                 break
    32         done
    33         part1=$path1
    34         path1=${orig1#$part1}
    35         depth=${path1//+([^\/])/..}
    36         path1=${path2#$path1}
    37         path1=${depth}${path2#$part1}
    38         path1=${path1##+(\/)}
    39         path1=${path1%/}
    40         if test ! "$path1"; then
    41                 path1=.
    42         fi
    43         printf "$path1"
    44 
    45 }
    46 
    47 relpath_test () {
    48         res=$(relpath_ /path1/to/dir1 /path1/to/dir2 )
    49         expected='../dir2'
    50         test_results "$res" "$expected"
    51 
    52         res=$(relpath_ / /path1/to/dir2 )
    53         expected='path1/to/dir2'
    54         test_results "$res" "$expected"
    55 
    56         res=$(relpath_ /path1/to/dir2 / )
    57         expected='../../..'
    58         test_results "$res" "$expected"
    59 
    60         res=$(relpath_ / / )
    61         expected='.'
    62         test_results "$res" "$expected"
    63 
    64         res=$(relpath_ /path/to/dir2/dir3 /path/to/dir1/dir4/dir4a )
    65         expected='../../dir1/dir4/dir4a'
    66         test_results "$res" "$expected"
    67 
    68         res=$(relpath_ /path/to/dir1/dir4/dir4a /path/to/dir2/dir3 )
    69         expected='../../../dir2/dir3'
    70         test_results "$res" "$expected"
    71 
    72         #res=$(relpath_ . /path/to/dir2/dir3 )
    73         #expected='../../../dir2/dir3'
    74         #test_results "$res" "$expected"
    75 }
    76 
    77 test_results () {
    78         if test ! "$1" = "$2"; then
    79                 printf 'failed!\nresult:\nX%sX\nexpected:\nX%sX\n\n' "$@"
    80         fi
    81 }
    82 
    83 #relpath_test
    84 
  

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