#!/usr/bin/perl

# treesed
# Written January 1996 by Rick Jansen (rick@sara.nl)
# URL: http://www.sara.nl/rick

# usage: treesed pattern1 pattern2 -tree 
#        treesed pattern1 pattern2 -files file1 file2 ... 

# example: treesed href HREF -files *.html

# Treesed searches for pattern1 and replaces pattern1 by pattern2
# if pattern2 supplied. If only pattern1 given treesed just searches.
# Treesed will search in all files and subdirectories of the current
# directory



#--------------------------------------------------------
# Parameters

$DoEdit=0;
$search_pattern = $ARGV[0];
$search_pattern =~ s/(\W)/\\$1/g;  # escape regexp chars
shift;

while ($#ARGV >= 0) {
  
  if ($ARGV[0] eq '-files') {
    @temp_ls = @ARGV[1 ..  $#ARGV];
    # Get list of files, skip dirs
    foreach $file (@ARGV[1 ..  $#ARGV]) {
      if (-f $file) { 
        push(@ls, $file); 
      }
    }
    last;
  }
  elsif ($ARGV[0] eq '-tree') {
    &Get_LS;
    last;
  }

  if (! -f $ARGV[0]) {
    if (defined($replacement_pattern)) {
      print "usage: treesed pattern1 <pattern2> -tree/-files <files>\n";
      exit(1);
    }

    $replacement_pattern = $ARGV[0];
    #$replacement_pattern =~ s/(\W)/\\$1/g;  # escape regexp chars
    $DoEdit=1;
    shift;
  }

}

# No files?
if ($#ls < 0) {
  print "xx No input files\n";
  exit(1);
}

print "search_pattern: $search_pattern\n";
print "replacement_pattern: $replacement_pattern\n";
if ($DoEdit) {
  print "\n** EDIT MODE!\n\n"; }
else {
  print "\n** Search mode\n\n";
}

#foreach $file (@ls) {
#  print "$file \n";
#}
  

#--------------------------------------------------------
# Search list of files for pattern

$linepos=0;

$| = 1;  # Force flush after every write
foreach $file (@ls) {
  #print "$file\n";
  print '.';
  $linepos++;
  if ($linepos > 50) {
    $linepos=0;
    print "\n";
  }

  if (!open(FILE, $file)) {
    print "\nCould not open $file\n";
    next;
  }

  $Found = 0;
  $Count = 0;
  $lineno = 0;
  @lines = ();
  while (<FILE>) {
    $lineno++;
    if (/$search_pattern/i) {
      #print;
      $Count++; 
      $Found = 1;
      push(@lines, $lineno);
    }
  }
  close(FILE);
  if ($Found) { 
    print "\n$file: $Count lines on: @lines\n"; 
  }

  if ($Found && $DoEdit) { &Edit($file); }
  
}
$| = 0;
print "\n";


exit(0);


#--------------------------------------------------------
# Edit file

sub Edit {

# Replace $ARGV[0] with $ARGV[1] in $file

local($file) = @_;
local($bakfile) = $file.'.'.$$;

# First create backup
open(FILE, $file) || die "Could not open $file for read\n";
open(BAKFILE, ">$bakfile")  || die "Could not open $bakfile for backup\n";
while (<FILE>) {
  print BAKFILE;
}
close(BAKFILE);
close(FILE);

# Now replace $ARGV[0] by $ARGV[1] in the backupfile, 
# result into $file
open(BAKFILE, $bakfile) || die "Could not open $bakfile for read\n";
open(FILE,">$file") || die "Could not open $file for write\n";
$Count=0;
while (<BAKFILE>) {
  if (/$search_pattern/i) { $Count++; }
  s/$search_pattern/$replacement_pattern/gi;
  print FILE;
}
close(BAKFILE);
close(FILE);

print 
"\nReplaced $search_pattern by $replacement_pattern on $Count lines in $file\n";

}  #sub Edit

#--------------------------------------------------------

sub Get_LS {

# Get a list of full path names into array @ls

local(@localls)=`ls -R1`;
local($item,$Dir);

#print "localls: @localls\n";
$Dir='';
foreach $item (@localls) {
  #print "$item\n";
  if ($item =~ /:$/) { 
    $Dir=$item; 
    chop($Dir);
    $Dir =~ s/:$/\//;
  }
  else {
    chop($item);
    $item = $Dir.$item;
    if ($item !~ /^\s*$/) { push(@ls, $item); }
  }
}
@localls=();

}  # sub Get_LS