File: cawk.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 # cawk [options...] [awk condition...] [files...]
  27 #
  28 #
  29 # Count with AWK: count the times the AWK expression/condition given is true.
  30 #
  31 # The handy case-insensitive shortcut options may cause this tool to fail,
  32 # if the main AWK tool installed doesn't support the special IGNORECASE
  33 # variable.
  34 #
  35 # The AWK options available only in single-dash versions are
  36 #
  37 #   -F fs, -Ffs, -F=fs    make `fs` the field separator
  38 #
  39 # The other options are, available both in single and double-dash versions
  40 #
  41 #   -h, -help    show this help message
  42 #   -i, -ins     match regexes case-insensitively; may fail the default `awk`
  43 #   -tsv         split fields using tabs, same as using -F "\t"
  44 
  45 
  46 tsv=0
  47 ins=0
  48 command='awk'
  49 
  50 while [ $# -gt 0 ]; do
  51     case "$1" in
  52         -F)
  53             if [ $# -lt 2 ]; then
  54                 printf "expected value after -F option\n" >&2
  55                 exit 1
  56             fi
  57             command="${command} -F $2"; shift 2; continue
  58         ;;
  59 
  60         -F*) command="${command} $1"; shift; continue ;;
  61 
  62         -h|--h|-help|--help)
  63             awk '/^# +cawk /, /^$/ { gsub(/^# ?/, ""); print }' "$0"
  64             exit 0
  65         ;;
  66 
  67         -i|--i|-ins|--ins|-insensitive|--insensitive) ins=1; shift; continue ;;
  68 
  69         -tsv|--tsv) tsv=1; shift; continue ;;
  70 
  71         -v)
  72             if [ $# -lt 2 ]; then
  73                 printf "expected variable assignment after -v option\n" >&2
  74                 exit 1
  75             fi
  76             command="${command} -v $1"; shift 2; continue
  77         ;;
  78 
  79         -) break ;;
  80 
  81         --) shift; break ;;
  82 
  83         -*)
  84             printf "unsupported option '%s'\n" "$1" >&2
  85             exit 1
  86         ;;
  87     esac
  88 
  89     break
  90 done
  91 
  92 cond="${1:-1}"
  93 [ $# -gt 0 ] && shift
  94 
  95 # show all non-existing files given
  96 failed=0
  97 for arg in "$@"; do
  98     [ "${arg}" = "-" ] && continue
  99     [ -e "${arg}" ] && continue
 100     printf "no file named \"%s\"\n" "${arg}" >&2
 101     failed=1
 102 done
 103 
 104 [ "${failed}" -gt 0 ] && exit 2
 105 
 106 ci='
 107     BEGIN {
 108         if (IGNORECASE == "") {
 109             m = "your `awk` command lacks case-insensitive regex-matching"
 110             print(m) > "/dev/stderr"
 111             exit 125
 112         }
 113         IGNORECASE = 1
 114     }
 115 '
 116 if [ "${ins}" -eq 0 ]; then
 117     ci=''
 118 fi
 119 
 120 src="${ci}"'
 121     BEGIN { n = c = count = 0 }
 122     ('"${cond}"') { n = c = ++count }
 123     END { print count + 0 }
 124 '
 125 
 126 if [ "${tsv}" -eq 1 ]; then
 127     ${command} -F "\t" "${src}" "$@"
 128 else
 129     ${command} "${src}" "$@"
 130 fi