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Shell Programming and Scripting

Suggestions for command line parsing

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Top Forums Shell Programming and Scripting Suggestions for command line parsing
# 8  
Old 06-25-2013
bash only (without external programs, i.e. awk, paste, sed etc.):

Code:
_expand() {
  local _s=$1 _q=${2:-,} _n IFS
  [[ $_s =~ [^$_q-[:digit:]]+ ]] && return 1 
  IFS=$_q read -a _a <<< "$_s" 
  for ((i = 0; i < ${#_a[@]}; i++)); do
    [[ ${_a[i]} =~ (-?[[:digit:]]+)-(-?[[:digit:]]+) ]] && 
      ((${BASH_REMATCH[1]} < ${BASH_REMATCH[2]})) &&
      for (( j = ${BASH_REMATCH[1]}; j <= ${BASH_REMATCH[2]}; j++)); do
        _n+=( $j ) || _n+=( ${_a[i]} )
      done ||
        for (( j = ${BASH_REMATCH[1]}; j >= ${BASH_REMATCH[2]}; j--)); do
        _n+=( $j ) || _n+=( ${_a[i]} )
      done
  done
  IFS=$_q; printf "%s\n" "${_n[*]}"
  }

Code:
$ _expand 9-12,19-15,20-20,0--5,-1-2,-5--1
9,10,11,12,19,18,17,16,15,20,0,-1,-2,-3,-4,-5,-1,0,1,2,-5,-4,-3,-2,-1

You may use a custom separator (the default is ,):
Code:
$ _expand 9-12:19-15:20-20:0--5:-1-2:-5--1 :
9:10:11:12:19:18:17:16:15:20:0:-1:-2:-3:-4:-5:-1:0:1:2:-5:-4:-3:-2:-1

The regular expression operator `=~', the add/append operator `+=' and the here-strings syntax `<<<', are version specific (old bash versions don't support them).
Last edited by radoulov; 06-25-2013 at 07:34 AM..
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