iankelling.org Git - tee-unique/blob - teeu

   1 #!/bin/bash
   2 # I, Ian Kelling, follow the GNU license recommendations at
   3 # https://www.gnu.org/licenses/license-recommendations.en.html. They
   4 # recommend that small programs, < 300 lines, be licensed under the
   5 # Apache License 2.0. This file contains or is part of one or more small
   6 # programs. If a small program grows beyond 300 lines, I plan to switch
   7 # its license to GPL.
   8
   9 # Copyright 2024 Ian Kelling
  10
  11 # Licensed under the Apache License, Version 2.0 (the "License");
  12 # you may not use this file except in compliance with the License.
  13 # You may obtain a copy of the License at
  14
  15 #     http://www.apache.org/licenses/LICENSE-2.0
  16
  17 # Unless required by applicable law or agreed to in writing, software
  18 # distributed under the License is distributed on an "AS IS" BASIS,
  19 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  20 # See the License for the specific language governing permissions and
  21 # limitations under the License.
  22
  23
  24 teeu() {
  25   local help="Usage: teeu [-h|--help] FILE [LINE]
  26 Append LINE if it's not already in FILE
  27
  28 If no LINE is specified, process each line from STDIN.
  29 teeu is short for tee unique.
  30
  31 -h|--help  display this message"
  32
  33   if [[ $1 == --help || $1 == -h ]]; then
  34     echo "$help"
  35     return
  36   fi
  37
  38   if (( ${#@} == 0 )) ; then
  39     echo "teeu error: need 1 or more arguments"
  40     echo "$help"
  41     return 1
  42   fi
  43   file="$1"
  44   shift
  45   local MAPFILE
  46   if [[ $1 ]]; then
  47     MAPFILE=("$*")
  48   else
  49     mapfile -t
  50   fi
  51   for line in "${MAPFILE[@]}"; do
  52     grep -xFq "$line" "$file" &>/dev/null || tee -a "$file" <<<"$line"
  53   done
  54   return 0
  55 }
  56 teeu "$@"