File: trimdecs.sh
   1 #!/bin/sh
   2 
   3 # The MIT License (MIT)
   4 #
   5 # Copyright © 2025 pacman64
   6 #
   7 # Permission is hereby granted, free of charge, to any person obtaining a copy
   8 # of this software and associated documentation files (the “Software”), to deal
   9 # in the Software without restriction, including without limitation the rights
  10 # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  11 # copies of the Software, and to permit persons to whom the Software is
  12 # furnished to do so, subject to the following conditions:
  13 #
  14 # The above copyright notice and this permission notice shall be included in
  15 # all copies or substantial portions of the Software.
  16 #
  17 # THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18 # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19 # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  20 # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  21 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  22 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  23 # SOFTWARE.
  24 
  25 
  26 # trimdecs [options...] [files...]
  27 #
  28 # TRIM DECimalS ignores all trailing decimal zeros in numbers, and even the
  29 # decimal dots themselves, when decimals in a number are all zeros.
  30 #
  31 # The help option is `-h`, `--h`, `-help`, or `--help`.
  32 
  33 
  34 case "$1" in
  35     -h|--h|-help|--help)
  36         awk '/^# +trimdecs /, /^$/ { gsub(/^# ?/, ""); print }' "$0"
  37         exit 0
  38     ;;
  39 esac
  40 
  41 [ "$1" = "--" ] && shift
  42 
  43 command='awk'
  44 if [ -p /dev/stdout ] || [ -t 1 ]; then
  45     command='stdbuf -oL awk'
  46 fi
  47 
  48 # works on gawk and busybox awk, but not on mawk, as the latter lacks `gensub`
  49 # ${command} '
  50 #     FNR == 1 { gsub(/^\xef\xbb\xbf/, "") }
  51 #     {
  52 #         gsub(/\r$/, "")
  53 #         $0 = gensub(/([0-9]+)\.0+/, "\\1", "g")
  54 #         $0 = gensub(/([0-9]+\.[0-9]*[1-9])0+/, "\\1", "g")
  55 #         print
  56 #     }
  57 # ' "$@"
  58 
  59 ${command} '
  60     FNR == 1 { gsub(/^\xef\xbb\xbf/, "") }
  61     { gsub(/\r$/, ""); print }
  62 ' "$@" | sed -u -E 's-([0-9]+)\.0+-\1-g; s-([0-9]+\.[0-9]*[1-9])0+-\1-g'