File: realign.sh
   1 #!/bin/sh
   2 
   3 # The MIT License (MIT)
   4 #
   5 # Copyright © 2024 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 # realign [options...] [filenames...]
  27 #
  28 # Realign all detected columns, right-aligning any detected numbers in any
  29 # column.
  30 #
  31 # To realign columns from TSV (tab-separated values) lines, use any among
  32 # these as the leading option: `-t`, `-tab` `-tabs`, or `-tsv`.
  33 #
  34 # Double-dashed variants of supported options are also supported.
  35 
  36 
  37 # handle leading options
  38 tsv=0
  39 case "$1" in
  40     -h|--h|-help|--help)
  41         # show help message, extracting the info-comment at the start
  42         # of this file, and quit
  43         awk '/^# +realign/, /^$/ { gsub(/^# ?/, ""); print }' "$0"
  44         exit 0
  45     ;;
  46     -t|--t|-tab|--tab|-tabs|--tabs|-tsv|--tsv)
  47         # enable TSV (tab-separated values) mode
  48         tsv=1
  49         shift
  50     ;;
  51 esac
  52 
  53 
  54 awk -v tsv="${tsv}" '
  55 BEGIN {
  56     if (tsv) FS = "\t"
  57 }
  58 
  59 {
  60     for (i = 1; i <= NF; i++) {
  61         w = length($i)
  62         if (maxw[i] < w) maxw[i] = w
  63         data[NR][i] = $i
  64     }
  65 }
  66 
  67 END {
  68     for (i in data) {
  69         for (j = 1; j <= length(data[i]); j++) {
  70             if (j > 1) printf "  "
  71             v = data[i][j]
  72             pad = match(v, /^[+-]?[0-9]+(\.[0-9]+)?$/) ? maxw[j] : -maxw[j]
  73             printf "%*s", pad, v
  74         }
  75         printf "\n"
  76     }
  77 }
  78 ' "$@"