#!/usr/bin/awk -f

## Default to C block comments. You can change the comment delimiters from
## command line. The delims are regexes. For instance call this script with
##
##   awk -v COMMENT_OPEN="#" -v COMMENT_CLOSE="$" -f <this-script> <files>
##
## to use shell comment delimiters.

BEGIN {
    ## Since COMMENT_* are regexes, we need to escape some sequences.
    if(COMMENT_OPEN == "")
        COMMENT_OPEN="/\\*"
    if(COMMENT_CLOSE == "")
        COMMENT_CLOSE="\\*/"
}

{
    while (match ($0, COMMENT_OPEN))
    { 
        before = substr ($0, 1, RSTART-1)
        $0 = substr($0, RSTART)
        printf(before)

        ## Reach line where first COMMENT_CLOSE is found.
        while (! match($0, COMMENT_CLOSE) )
            getline

        $0 = substr($0, RSTART + length(COMMENT_CLOSE) -1)
    }
    print
}