# This program is under GPL v. 3 or later, see <http://www.gnu.org/licenses/>
appendu() {
- local help="Usage: appendu [OPTION]... FILE LINE...
-Append unique. Append each LINE to FILE if it does not exist in FILE.
-Appended lines are output to the terminal.
+ local help="Usage: appendu [OPTION]... FILE [LINE_SET]...
+
+Append unique.
+
+A LINE_SET is one or more lines. Append LINE_SET to FILE if it does not exist in
+FILE. If no LINE_SET argument is given, read lines from stdin, and treat each
+as a single LINE_SET. Appended text is output to the terminal.
-s don't try to use sudo when it would help us read or write the file
-- stop processing arguments
--help display this message"
+ local readsudo writesudo x strings string content
local dosudo=true
while true; do
fi
done
- if (( ${#@} < 2 )); then
- echo "error: need 2 or more arguments"
+ if [[ ${#@} == 0 ]]; then
+ echo "error: need 1 or more arguments"
echo "$help"
return 1
fi
- local readsudo writesudo
local file="$1"
shift
-
+
+ local file_exists=false
if [[ -e $file ]]; then
+ file_exists=true
[[ -r $file ]] || readsudo=sudo
[[ -w $file ]] || writesudo=sudo
- else
+ else
local dir="$(dirname "$file")"
if [[ -d $dir ]]; then
[[ ! -w $dir ]] && writesudo=sudo
else
echo "appendu error: $dir does not exist"
- exit 1
+ return 1
fi
fi
if ! $dosudo; then
readsudo=
writesudo=
fi
- for x in "$@"; do
- [[ -e "$file" ]] && $readsudo grep -q "^$x$" "$file" || $writesudo tee -a "$file"<<<"$x"
- done
+
+ if (( $# == 0 )); then
+ unset IFS
+ while read -r x; do
+ strings+=( "$x" )
+ done
+ else
+ strings=( "$@" )
+ fi
+
+ if $file_exists; then
+ # fix files with no newline at the end.
+ # the following command won't work right on them.
+ # e = run script, $a\ means append following text, but there is none,
+ # so sed only does what it always does when it was supposed to modify a file,
+ # which is append a newline if there was none.
+ sed -ie '$a\' "$file"
+ # command substitution removes any trailing newlines, so we have to add
+ # a non-newline ending, we randomly chose "b", then remove it.
+ content=$($readsudo cat "$file"; echo b) content=${content%b}
+
+ # we aren't using regex because we want to match strings,
+ # but we also want our match to start at the beginning of a line,
+ # or the beginning of the file, and to end at a line ending.
+ # So we do some slick bash to match this.
+ local start="?(*
+)"
+ local end="
+*"
+ for string in "${strings[@]}"; do
+ [[ $content != $start"$string"$end ]] && $writesudo tee -a "$file"<<<"$string"
+ done
+ else
+ for string in "${strings[@]}"; do
+ $writesudo tee -a "$file"<<<"${strings[@]}"
+ done
+ fi
+ return 0
}
appendu "$@"