File: realign.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 # realign [filenames...]
  27 #
  28 # Realign all detected columns, right-aligning any detected numbers in any
  29 # column.
  30 
  31 
  32 case "$1" in
  33     -h|--h|-help|--help)
  34         awk '/^# +realign /, /^$/ { gsub(/^# ?/, ""); print }' "$0"
  35         exit 0
  36     ;;
  37 esac
  38 
  39 
  40 awk '
  41     function match_number(v) {
  42         return match(v, /^[+-]?[0-9]+(\.[0-9]+)?$/)
  43     }
  44 
  45     function match_dot_digits(v) {
  46         return match(v, /\.[0-9]+$/)
  47     }
  48 
  49     { gsub(/\r$/, "") }
  50 
  51     FNR == 1 {
  52         FS = ($0 ~ /\t/) ? "\t" : " "
  53         $0 = $0
  54     }
  55 
  56     {
  57         for (i = 1; i <= NF; i++) {
  58             data[NR][i] = $i
  59 
  60             if (match_number($i)) {
  61                 if (match_dot_digits($i)) {
  62                     dd = RLENGTH
  63                     if (dot_decs[i] < dd) dot_decs[i] = dd
  64                     iw = RSTART - 1
  65                     if (int_widths[i] < iw) int_widths[i] = iw
  66                 } else {
  67                     w = length($i)
  68                     if (int_widths[i] < w) int_widths[i] = w
  69                 }
  70 
  71                 continue
  72             }
  73 
  74             w = length($i)
  75             if (widths[i] < w) widths[i] = w
  76         }
  77     }
  78 
  79     END {
  80         # fix column-widths using the number-padding info
  81         for (i = 1; i <= NF; i++) {
  82             w = int_widths[i] + dot_decs[i]
  83             if (widths[i] < w) widths[i] = w
  84         }
  85 
  86         for (i = 1; i <= NR; i++) {
  87             last = length(data[i])
  88 
  89             for (j = 1; j <= last; j++) {
  90                 if (j > 1) printf "  " # put 2-space gaps between columns
  91 
  92                 v = data[i][j]
  93 
  94                 if (!match_number(v)) {
  95                     # avoid adding trailing spaces at the end of lines
  96                     printf "%*s", (j == last) ? 0 : -widths[j], v
  97                     continue
  98                 }
  99 
 100                 w = length(v)
 101                 if (match_dot_digits(v)) {
 102                     dd = RLENGTH
 103                     iw = RSTART - 1
 104                 } else {
 105                     dd = 0
 106                     iw = w
 107                 }
 108 
 109                 dpad = dot_decs[j] - dd
 110                 ipad = int_widths[j] - iw
 111                 if (ipad < 0) ipad = 0
 112                 lpad = widths[j] - (ipad + w + dpad)
 113                 if (lpad < 0) lpad = 0
 114 
 115                 # avoid adding trailing spaces at the end of lines
 116                 if (j == last) dpad = 0
 117 
 118                 printf "%*s%*s%s%*s", lpad, "", ipad, "", v, dpad, ""
 119             }
 120 
 121             printf "\n"
 122         }
 123     }
 124 ' "$@"