#!/usr/bin/perl
eval "exec /usr/local/bin/perl -S $0 $*"
    if $running_under_some_shell;

require 'getopts.pl';
&Getopts("p:vh");		# help, pattern file, verbose,

if ($opt_h || ! $opt_p) {
    print STDERR <<NO_MORE_HELP;
word-replace

   Replace *words* with patterns.   Pattern file specifies which patterns
   to replace on each line.  All patterns are wrapped with perl \\b regexp
   specifiers.

Usage: $0       [-v] -p pattern-file files to replace

    -v          -- possibly more verbose
    -p file     -- pattern file
    -h          -- help

    anything else == this help message

Pattern file looks like this:

# Example:
# ignores all lines with beginning with # or not exactly 2 fields
_Dorky_Name  rtems_dorky_name           # comments, and blank lines are cool
_Dorky_Name2 rtems_dorky_name2          # comments, and blank lines are cool
NO_MORE_HELP
    exit 0;
}

$verbose = $opt_v;
$pattern_file = $opt_p;

# make standard outputs unbuffered (so the '.'s come out ok)
$oldfh = select(STDERR); $| = 1; select($oldfh);
$oldfh = select(STDOUT); $| = 1; select($oldfh);

# pull in the patterns
open(PATTERNS, "<$pattern_file") ||
    die "could not open $pattern_file: $!, crapped out at";

foreach (<PATTERNS>)
{
    chop;
    s/#.*//;
    next if /^$/;
    ($orig, $new, $junk, @rest) = split;
    next if ( ! $orig || ! $new || $junk); # <2 or >2 patterns
    die "pattern appears 2x: '$orig' in '$pattern_file'--" if defined($patterns{$orig});
    $patterns{$orig} = $new;
}
close PATTERNS;

# walk thru each line in each file
foreach $file (@ARGV)
{
    print "$file\t";

    open (INFILE, "<$file") ||
        die "could not open input file $file: $!";

    $outfile = $file . ".fixed";;
    open (OUTFILE, ">$outfile") ||
        die "could not open output file $outfile: $!";

    while (<INFILE>)
    {
        study;                  # maybe make s/// faster
        foreach $key (keys %patterns)
        {
            if ( s/\b$key\b/$patterns{$key}/ge )
            {
                print ".";
            }
        }
        print OUTFILE $_;
    }
    print "\n";
    close INFILE;
    close OUTFILE;
}

