#!/bin/bash
-# Copyright (C) 2014 Ian Kelling
+# Copyright (C) 2014-2016 Ian Kelling
# This program is under GPL v. 3 or later, see <http://www.gnu.org/licenses/>
lnf() {
- local help="lnf [--help] LN_ARGUMENTS...
-Create symlinks conveniently and forcefully.
-Remove existing file/links using trash-put or rm -rf if it is not available.
-Create directory if needed. Finally, ln -s -- LN_ARGUMENTS"
- if [[ $1 == --help ]]; then
+ local help="Usage:
+ lnf -T TARGET LINK_NAME (1st form)
+ lnf TARGET (2nd form)
+ lnf TARGET... DIRECTORY (3rd form)
+Create symlinks forcefully
+
+Removes existing files using trash-put or rm -rf if it is not available,
+or trash-put fails due to a limitation such as a cross-filesystem link.
+Create directory if needed. Slightly more restrictive arguments than ln.
+
+In the 1st form, create a link to TARGET with the name LINK_NAME. In the 2nd
+form, create a link to TARGET in the current directory. In the 3rd form, create
+links to each TARGET in DIRECTORY."
+
+ if [[ $1 == --help || $1 == -h || $# -eq 0 ]]; then
echo "$help"
return 0
fi
-
- local remove x
- if type -P dircolors >/dev/null; then
- remove=trash-put
- else
- remove="rm -rf"
+
+ local nodir
+ if [[ $1 == -T ]]; then
+ nodir=-T
+ shift
+ if (( $# != 2 )); then
+ echo "lnf error: expected 2 arguments with -T flag. Got $#"
+ return 1
+ fi
fi
-
- if [[ $# -ge 3 && ! -d ${!#} ]]; then
- mkdir -p "${!#}"
- elif [[ $# -ge 2 && -d ${!#} ]]; then
- local oldcwd=$PWD
- cd ${!#} # last arg
- for x in "${@:1:$(($#-1))}"; do # all but last arg
- # remove any trailing slashes
- x="${x%%+(/)}"
- # remove any leading directory components
- x="${x##*/}"
- [[ -e "$x" || -L "$x" ]] && $remove "$x"
- done
- cd "$oldcwd"
- elif [[ $# -eq 2 ]]; then
- if [[ -e "$2" || -L "$2" ]]; then
- $remove "$2"
- elif [[ ! -d "$2/.." ]]; then
- mkdir -p "$2/.."
+
+ local reset_extglob=false
+ ! shopt extglob >/dev/null && reset_extglob=true
+ shopt -s extglob
+
+
+ local x ret prefix dir to_remove
+ local mkdir=false
+
+ to_remove=()
+ if [[ $nodir ]]; then
+ dir="$(dirname "$2")"
+ if [[ -e $2 || -L $2 ]]; then
+ to_remove+=("$2")
+ elif [[ ! -d $dir ]]; then
+ mkdir=true
+ if [[ -e $dir || -L $dir ]]; then
+ to_remove+=("$dir")
+ fi
+ fi
+ elif (( $# >= 2 )); then
+ if [[ -d ${!#} ]]; then
+ prefix="${!#}/" # last arg
+ for x in "${@:1:$(( $# - 1 ))}"; do # all but last arg
+ # Remove 1 or more trailing slashes, using.
+ x="${x%%+(/)}"
+ # remove any leading directory components, add prefix
+ x="$prefix/${x##*/}"
+ [[ -e "$x" || -L "$x" ]] && to_remove+=("$x")
+ done
+ else
+ if ! mkdir -p "${!#}"; then
+ echo "lnf error: failed to make directory ${!#}"
+ return 1
+ fi
fi
elif [[ $# -eq 1 ]]; then
- [[ -e "${1##*/}" || -L "${1##*/}" ]] && $remove "${1##*/}"
+ [[ -e "${1##*/}" || -L "${1##*/}" ]] && to_remove+=("${1##*/}")
+ fi
+ if (( ${#to_remove[@]} >= 1 )); then
+ if type -P trash-put >/dev/null; then
+ trash-put -- "${to_remove[@]}" || ret=$?
+ # trash-put will fail to trash a link that goes across filesystems (72),
+ # and for empty files (74)
+ # so revert to rm -rf in that case
+ if [[ $ret == 72 ]]; then
+ echo "$0: using rm -rf to overcome cross filesystem trash-put limitation"
+ rm -rf -- "${to_remove[@]}"
+ elif [[ $ret == 74 ]]; then
+ echo "$0: using rm -rf to overcome empty file & hardlink trash-put limitation"
+ rm -rf -- "${to_remove[@]}"
+ elif [[ $ret && $ret != 0 ]]; then
+ return $x
+ fi
+ else
+ rm -rf -- "${to_remove[@]}"
+ fi
+ fi
+
+ $reset_extglob && shopt -u extglob
+
+ if $mkdir; then
+ if ! mkdir -p "$(dirname "$2")"; then
+ echo "lnf error: failed to make directory $(dirname "$2")"
+ return 1
+ fi
fi
- ln -s -- "$@"
+
+ ln -s $nodir -- "$@"
}
lnf "$@"
iankelling.org / git / lnf / blobdiff