File: ptsv.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 # ptsv [column names...]
  27 #
  28 # Pick Tab Separated-Values, trying to match the column names given using the
  29 # first line from stdin. Matching works by first trying exact matching, then
  30 # case-insensitive matching, when there's no exact match, finally giving up
  31 # when there's no match either way.
  32 
  33 
  34 # handle leading options
  35 case "$1" in
  36     -h|--h|-help|--help)
  37         awk '/^# +ptsv/, /^$/ { gsub(/^# ?/, ""); print }' "$0"
  38         exit 0
  39     ;;
  40 esac
  41 
  42 
  43 awk -F "\t" '
  44 BEGIN {
  45     for (i = 1; i < ARGC; i++) {
  46         colnames[++n] = ARGV[i]
  47         delete ARGV[i]
  48     }
  49 }
  50 
  51 function findcol(name, lowname, i) {
  52     for (i = 1; i <= NF; i++) {
  53         if (name == $i) return i
  54     }
  55 
  56     for (i = 1; i <= NF; i++) {
  57         if (lowname == tolower($i)) return i
  58     }
  59 
  60     return 0
  61 }
  62 
  63 NR == 1 {
  64     for (i = 1; i <= n; i++) lownames[i] = tolower(colnames[i])
  65 
  66     for (i = 1; i <= NF; i++) {
  67         j = findcol(colnames[i], lownames[i])
  68         if (j > 0) pick[++numcols] = j
  69     }
  70 
  71     if (numcols == 0) exit
  72 }
  73 
  74 {
  75     for (i = 1; i <= numcols; i++) {
  76         if (i > 1) printf "\t"
  77         printf "%s", $(pick[i])
  78     }
  79 
  80     printf "\n"
  81     fflush()
  82 }
  83 ' "$@"