trash

#!/bin/sh
# trash: move files to trash
# this file in public domain

trashdir="${TRASH:-"${XDG_DATA_HOME:-"$HOME/.local/share"}/Trash"}"
retval=0
IFS="/"

usage() {
	echo "usage: trash file..." >&2
	exit 1
}

# make trash directory and set its mode
mktrashdir() {
	if ! mkdir -p -- "$trashdir/files" "$trashdir/info" >/dev/null 2>&1
	then
		echo "trash: unable to create $trashdir"
		exit 1
	fi
	chmod 700 "$trashdir"
}

# canonicalize "//", "/./", and "/../" from $filename into $path
setpath() {
	path=""
	case "$filename" in
	([!/]*) filename="$PWD/$filename" ;;
	esac
	for segment in $filename
	do
		case "$segment" in
		("")                         ;;
		(".")                        ;;
		("..") path="${path%/*}"     ;;
		(*)    path="$path/$segment" ;;
		esac
	done
}

# break basename of $path into body and extension; set $newfile
# to "body.ext" (or "body_N.ext", for a unique file)
setnewfile() {
	basename="${path##*/}"
	body="${basename%.*}"
	ext="${basename##"$body"}"
	i=""
	p=""
	while test -e "$trashdir/files/$body$p$i$ext"
	do
		p="_"
		if [ -z "$i" ]
		then
			i=1
		else
			i=$((i + 1))
		fi
	done
	newfile="$body$p$i$ext"
}

# make $trashdir/info/$newfile.trashinfo file containing the original
# path of the trashed file and its date of deletion
mktrashinfo() {
	cat > "$trashdir/info/$newfile.trashinfo" <<-END
		[Trash Info]
		Path=$path
		DeletionDate=$(date +"%FT%H:%M:%S")
	END
}

# move $path into $trashdir/files/$newfile
movetotrash() {

	if ! mv -- "$path" "$trashdir/files/$newfile" >/dev/null 2>&1
	then
		echo "trash: $arg: could not move file to trash" >&2
		retval=1
	else
		mktrashinfo
	fi
}

[ $# -eq 0 ] && usage
mktrashdir
for arg
do
	filename="$arg"
	setpath
	if test ! -e "$path"
	then
		echo "trash: $arg: no such file or directory" >&2
		retval=1
	else
		setnewfile
		movetotrash
	fi
done
exit $retval