File: sums.sh
   1 #!/bin/sh
   2 
   3 # The MIT License (MIT)
   4 #
   5 # Copyright © 2020-2025 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 # sums [filepaths...]
  27 #
  28 # Add a final sums row after all input lines.
  29 
  30 
  31 case "$1" in
  32     -h|--h|-help|--help)
  33         awk '/^# +sums /, /^$/ { gsub(/^# ?/, ""); print }' "$0"
  34         exit 0
  35     ;;
  36 esac
  37 
  38 [ "$1" = "--" ] && shift
  39 
  40 command='awk'
  41 if [ -p /dev/stdout ] || [ -t /dev/stdout ]; then
  42     command='stdbuf -oL awk'
  43 fi
  44 
  45 # show all non-existing files given
  46 failed=0
  47 for arg in "$@"; do
  48     if [ "${arg}" = "-" ]; then
  49         continue
  50     fi
  51     if [ ! -e "${arg}" ]; then
  52         printf "no file named \"%s\"\n" "${arg}" > /dev/stderr
  53         failed=1
  54     fi
  55 done
  56 
  57 if [ "${failed}" -gt 0 ]; then
  58     exit 2
  59 fi
  60 
  61 ${command} '
  62     { gsub(/\r$/, "") }
  63 
  64     NR == 1 { FS = ($0 ~ /\t/) ? "\t" : " "; $0 = $0 }
  65 
  66     {
  67         if (n < NF) n = NF
  68         for (i = 1; i <= NF; i++) sums[i] += $i
  69         print
  70     }
  71 
  72     END {
  73         for (i = 1; i <= n; i++) {
  74             if (i > 1) printf(FS)
  75             printf("%s", sums[i])
  76         }
  77         if (n > 0) printf "\n"
  78     }
  79 ' "$@"