File: pa.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 # pa [options...] [awk expressions...]
  27 #
  28 # Print Awk evaluates and prints the results of all the expressions given.
  29 #
  30 # All expressions are evaluated and printed in a `BEGIN` block, which prevents
  31 # the usual record/line-processing mode.
  32 #
  33 # The options are, available both in single and double-dash versions
  34 #
  35 #   -d, -debug      show code given to `awk` on the standard error
  36 #   -h, -help       show this help message
  37 #   -v, -verbose    show an ANSI-styled banner for each command being run
  38 
  39 
  40 debug=0
  41 verbose=0
  42 cmd='awk'
  43 
  44 while [ $# -gt 0 ]; do
  45     case "$1" in
  46         --bignum) cmd="${cmd} --bignum"; shift ;;
  47 
  48         -d|--d|-debug|--debug) debug=1; shift ;;
  49 
  50         -h|--h|-help|--help)
  51             awk '/^# +pa /, /^$/ { gsub(/^# ?/, ""); print }' "$0"
  52             exit 0
  53         ;;
  54 
  55         -v|--v|-verbose|--verbose) verbose=1; shift ;;
  56 
  57         --) shift; break ;;
  58 
  59         -*)
  60             printf "unsupported option '%s'\n" "$1" >&2
  61             exit 1
  62         ;;
  63     esac
  64 
  65     break
  66 done
  67 
  68 if [ $# -eq 0 ]; then
  69     awk '/^# +pa /, /^$/ { gsub(/^# ?/, ""); print }' "$0" >&2
  70     exit 1
  71 fi
  72 
  73 code="$(awk -v verbose="${verbose}" '
  74     BEGIN {
  75         vfmt = "        print \"\\x1b[7m%s\\x1b[0m\" > \"/dev/stderr\"\n"
  76         print "    BEGIN {"
  77         for (i = 1; i < ARGC; i++) {
  78             if (verbose) printf(vfmt, ARGV[i])
  79             printf("        print(%s)\n", ARGV[i])
  80         }
  81         print "        exit"
  82         print "    }"
  83         exit
  84     }
  85 ' "$@")"
  86 
  87 [ "${debug}" -eq 1 ] && printf "%s\n" "${code}" >&2
  88 ${cmd} "${code}"