iankelling.org Git - lnf/blob - lnf-function

   1 #!/bin/bash
   2 # Copyright (C) 2014 Ian Kelling
   3 # This program is under GPL v. 3 or later, see <http://www.gnu.org/licenses/>
   4
   5 lnf() {
   6     local help="lnf [--help] [-T] LN_ARGUMENT...
   7 Create symlinks conveniently and forcefully.
   8
   9 Remove existing file/links using trash-put or rm -rf if it is not available.
  10 Create directory if needed. Small change to ln argument semantics: for 2 arguments,
  11 the second argument is a directory unless -T is passed. This removes ambiguity of
  12 replacing a file but not a directory. No ln option arguments are supported."
  13
  14     if [[ $1 == --help || $# -eq 0 ]]; then
  15         echo "$help"
  16         return 0
  17     fi
  18
  19     local nodir=false
  20     if [[ $1 == -T ]]; then
  21         nodir=true
  22         shift
  23     fi
  24
  25     local reset_extglob=false
  26     ! shopt extglob >/dev/null && reset_extglob=true
  27     shopt -s extglob
  28
  29
  30     local remove x
  31     if type -P trash-put >/dev/null; then
  32         remove=trash-put
  33     else
  34         remove="rm -rf"
  35     fi
  36
  37     if $nodir && [[ $# -eq 2 ]]; then
  38         if [[ -e "$2" || -L "$2" ]]; then
  39             $remove "$2"
  40         elif [[ ! -d "$2/.." ]]; then
  41             mkdir -p "$2/.."
  42         fi
  43     elif [[ $# -ge 2 ]]; then
  44         if [[ -d ${!#} ]]; then
  45             local oldcwd=$PWD
  46             cd "${!#}" # last arg
  47             for x in "${@:1:$(( $# - 1 ))}"; do # all but last arg
  48                 # remove any trailing slashes, uses extglob
  49                 x="${x%%+(/)}"
  50                 # remove any leading directory components
  51                 x="${x##*/}"
  52                 [[ -e "$x" || -L "$x" ]] && $remove "$x"
  53             done
  54             cd "$oldcwd"
  55         else
  56             mkdir -p "${!#}"
  57         fi
  58     elif  [[ $# -eq 1 ]]; then
  59         [[ -e "${1##*/}" || -L "${1##*/}" ]] && $remove "${1##*/}"
  60     fi
  61
  62     $reset_extglob && shopt -u extglob
  63     ln -s -- "$@"
  64 }