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

   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 appendu() {
   6     local help="Usage: appendu [OPTION]... FILE LINE...
   7 Append unique. Append each LINE to FILE if it does not exist in FILE.
   8 Appended lines are output to the terminal.
   9
  10   -s      don't try to use sudo when it would help us read or write the file
  11   --      stop processing arguments
  12   --help  display this message"
  13
  14     local dosudo=true
  15
  16     while true; do
  17         if [[ $1 == --help ]]; then
  18             echo "$help"
  19             return
  20         elif [[ $1 == -s ]]; then
  21             dosudo=false
  22             shift
  23         elif [[ $1 == -- ]]; then
  24             shift
  25             break
  26         else
  27             break
  28         fi
  29     done
  30
  31     if (( ${#@} < 2 )); then
  32         echo "error: need 2 or more arguments"
  33         echo "$help"
  34         return 1
  35     fi
  36
  37     local readsudo writesudo
  38     local file="$1"
  39     shift
  40
  41     if [[ -e $file ]]; then
  42         [[ -r $file ]] || readsudo=sudo
  43         [[ -w $file ]] || writesudo=sudo
  44     else
  45         local dir="$(dirname "$file")"
  46         if [[ -d $dir ]]; then
  47             [[ ! -w $dir ]] && writesudo=sudo
  48         else
  49             echo "appendu error: $dir does not exist"
  50             exit 1
  51         fi
  52     fi
  53     if ! $dosudo; then
  54         readsudo=
  55         writesudo=
  56     fi
  57     for x in "$@"; do
  58         [[ -e "$file" ]] && $readsudo grep -q "^$x$" "$file" || $writesudo tee -a "$file"<<<"$x"
  59     done
  60 }
  61 appendu "$@"