cvs commit: jakarta-avalon-excalibur/tools/bin replace

[jefft]

jefft       02/04/12 04:57:14

  Added:       tools/bin replace
  Log:
  Script to replace a block of text with another, in multiple files. Useful for
  making changes in multiple build.xml files.
  
  Revision  Changes    Path
  1.1                  jakarta-avalon-excalibur/tools/bin/replace
  
  Index: replace
  ===================================================================
  #!/usr/bin/perl -w
  #
  # Script to replace one multiline string with another in a list of files.
  # Typical usage: re "`cat fromfile`" "`cat tofile`" *.xml
  #   Where fromfile contains the regexp, and tofile contains text to replace
  #   each regexp match with
  #
  # Author: Jeff Turner <[EMAIL PROTECTED]>
  # Based on code at
  # http://www.cclabs.missouri.edu/things/instruction/perl/perlcourse.html
  
  sub usage() {
      print "
  $0: A script to replace one block of text with another in multiple files
  Usage: $0 <from> <to> [file...]
    Where <from> is a regex occurring in [file]
          <to> is a string which will replace each occurrence of <from>
          [file...] a list of files to act on.\n"
  }
  
  $original = shift(@ARGV) or &usage and exit;
  $replacement = shift(@ARGV) or &usage and exit;
  
  $nchanges = 0;
  # The input record separator is defined by Perl global 
  # variable $/.  It can be anything, including multiple 
  # characters.  Normally it is "\n", newline.  Here, we
  # say there is no record separator, so the whole file
  # is read as one long record, newlines included.
  undef $/;
  
  foreach $file (@ARGV) {
      if (! open(INPUT,"<$file") ) {
          print STDERR "Can't open input file $file\n";
          next;
      }
  
  # Read input file as one long record.
      $data=<INPUT>;
      close INPUT;
  
      if ($data =~ s/\Q$original/$replacement/gs) {
          $bakfile = "$file.bak";
  # Abort if can't backup original or output.
          if (! rename($file,$bakfile)) {
              die "Can't rename $file $!";
          }
          if (! open(OUTPUT,">$file") ) {
              die "Can't open output file $file\n";
          }
          print OUTPUT $data;
          close OUTPUT;
          print STDERR "$file changed\n";
          $nchanges++;
      }
  
      else {  print STDERR "$file not changed\n"; }
  }
  print STDERR "$nchanges files changed.\n";
  exit(0); 
  
  
  

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