File: sums.sh
   1 #!/bin/sh
   2 
   3 # The MIT License (MIT)
   4 #
   5 # Copyright (c) 2026 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 # sums [options...] [files...]
  27 #
  28 # Add a final sums row after all input lines. TSV tables are auto-detected
  29 # using the first line, by checking if there are any tabs in it.
  30 #
  31 # The options are, available both in single and double-dash versions
  32 #
  33 #   -h, -help    show this help message
  34 
  35 
  36 case "$1" in
  37     -h|--h|-help|--help)
  38         awk '/^# +sums /, /^$/ { gsub(/^# ?/, ""); print }' "$0"
  39         exit 0
  40     ;;
  41 
  42     -) ;;
  43 
  44     --) shift ;;
  45 
  46     -*)
  47         printf "unsupported option '%s'\n" "$1" >&2
  48         exit 1
  49     ;;
  50 esac
  51 
  52 # show all non-existing files given
  53 failed=0
  54 for arg in "$@"; do
  55     [ "${arg}" = "-" ] && continue
  56     [ -e "${arg}" ] && continue
  57     printf "no file named \"%s\"\n" "${arg}" >&2
  58     failed=1
  59 done
  60 
  61 [ "${failed}" -gt 0 ] && exit 2
  62 
  63 flush=0
  64 if [ -p /dev/stdout ] || [ -t 1 ]; then
  65     flush=1
  66 fi
  67 
  68 awk -v flush="${flush}" '
  69     { gsub(/\r$/, "") }
  70 
  71     NR == 1 { FS = /\t/ ? "\t" : " "; $0 = $0 }
  72 
  73     {
  74         if (n < NF) n = NF
  75         for (i = 1; i <= NF; i++) sums[i] += $i
  76         print
  77         if (flush) fflush()
  78     }
  79 
  80     END {
  81         for (i = 1; i <= n; i++) {
  82             if (i > 1) printf(FS)
  83             printf("%s", sums[i])
  84         }
  85         if (n > 0) print ""
  86     }
  87 ' "$@"