#!/usr/bin/perl -w
# fixuifiles processes .ui files and removes some insanity:
# * Too high minimum Qt version (see $minversion_* in the top of the script)
# * Hardcoded untranslatable Alt+Letter accels (auto-added by Qt Designer)
# * Captions that are equal to classname (auto-added by Qt Designer)

# This script is licensed under the GPL version 2.
# (c) 2004 David Faure <faure@kde.org>
# Based on fixkdeincludes, (c) 2001-2003 Dirk Mueller <mueller@kde.org>

use strict;
use File::Basename;
use Cwd;

# Fix the version number in .ui files if it's bigger than this:
my $default_minversion_maj = 3;
my $default_minversion_min = 3;

# Known words which are ok as captions
my %knowncaptions = (
  'Settings' => '',
  'Statistics' => '',
  'General' => '',
  'Tracks' => '',
  'Constants' => '',
  'Preferences' => '',
  'Encryption' => ''
);

# declaration of useful subroutines
sub process_ui_file($);
sub find_ui_files($);
sub read_required_version($);

# some global variables
my $verbose = 0; # turns on debugging
my $omit_Qt_check = 0; # turns off Qt version checking
my @explicitfiles = (); # filled in if passing files on the command line
my $minversion_maj = $default_minversion_maj;
my $minversion_min = $default_minversion_min;

while (defined ($ARGV[0]))
{
  $_ = shift;
  if (/^--help$|^-h$/)  {
    print "Usage: fixuifiles [OPTIONS] files...\n";
    print "Options are:\n";
    print "\t-v, --verbose\tBe verbose\n";
    print "\t--omitqtcheck\tDoes not check for Qt minimum version\n";
    exit 0;
  }
  elsif (/^--verbose$|^-v$/) {
    $verbose = 1;
  }elsif (/^--omitqtcheck/) {
    $omit_Qt_check = 1;
  }
  elsif (!/^-/) {
    push @explicitfiles, $_;
  }
}

# Find .ui files in the given dir
sub find_ui_files($)
{
  my ( $dir ) = @_;

  opendir (DIR, "$dir") || die "Couldn't read '$dir'\n";
  my @files = grep { /^.*\.ui$/ } readdir(DIR);
  closedir(DIR);

  #print "found files: [ " . join(' ', @files) . " ] in $dir\n" if ($verbose);

  # prefix them with $dir
  my @retfiles = ();
  foreach my $file(@files) {
    push @retfiles, "$dir/$file";
  }

  return @retfiles;
}

# Ensure the version at the top of the file is not too high
sub fix_version($)
{
  my $srcfile = shift @_;
  open(SRC, "< $srcfile") || die "fix_version: couldn't open '$srcfile'\n";
  my @contents = <SRC>;
  my @fixedcontents = ();
  close(SRC);
  my $needfix = 0;
  my $foundversion = 0;
  foreach my $line (@contents) {
      if (!$foundversion && $line =~ m/version=\"([0-9]+)\.([0-9]+)(\.[0-9]+)?\"/) {
	  my $version_maj = $1;
	  my $version_min = $2;
	  if ( $version_maj > $minversion_maj ||
	       ( $version_maj == $minversion_maj && $version_min > $minversion_min ) ) {
	      $line =~ s/version=\"[0-9]+\.[0-9]+\"/version=\"$minversion_maj.$minversion_min\"/o;
	      $needfix = 1;
	      print "$srcfile: version was $version_maj.$version_min, set to $minversion_maj.$minversion_min\n";
	  }
	  $foundversion = 1;
      }
      push @fixedcontents, $line;
  }
  if (!$foundversion) {
      # TODO improve so that the script adds the necessary line
      print "$srcfile has no UI version, please fix it\n";
  }
  if ($needfix) {
      open(SRC, "> $srcfile") || die "fix_version: couldn't open '$srcfile' for writing\n";
      print SRC @fixedcontents;
      close(SRC);
  }
}

# Ensure no auto-added Alt+letter accel exists - those are untranslatable
sub fix_accels($)
{
  my $srcfile = shift @_;
  open(SRC, "< $srcfile") || die "fix_accels: couldn't open '$srcfile'\n";
  my @contents = <SRC>;
  close(SRC);
  return if ( !grep( /<string>Alt\+[A-Z]<\/string>/, @contents ));
  my @fixedcontents = ();

  my $firstline;
  my $accelsremoved = 0;
  my $inside_accel = 0;
  # inside_accel is 0 before <property>
  # 1 after <property> and before <string>
  # 2 after <string> if alt+letter, and before </property>
  foreach my $line (@contents) {
      if ( $inside_accel == 1 ) {
	  if ( $line =~ m/<string>(Alt\+[A-Z])<\/string>/ ) {
	      print "$srcfile: accel $1 removed\n" if ($verbose);
	      $inside_accel = 2;
	      $accelsremoved++;
	  } else { # Not alt+letter, keep accel
	      push @fixedcontents, $firstline;
	      $inside_accel = 0;
	  }
      }
      if ($line =~ m/property name=\"accel\"/) {
	  $inside_accel = 1;
	  $firstline = $line;
      }
      if ($inside_accel == 0) {
	  push @fixedcontents, $line;
      }
      $inside_accel = 0 if ($inside_accel && $line =~ m/<\/property>/);
  }
  if ($accelsremoved) {
      print "$srcfile: $accelsremoved accels removed\n";
      open(SRC, "> $srcfile") || die "fix_accels: couldn't open '$srcfile' for writing\n";
      print SRC @fixedcontents;
      close(SRC);
  }
}

# Ensure no auto-added caption exists - it's pretty stupid to have to
# translate Form1 or MyClassName
sub fix_captions($)
{
  my $srcfile = shift @_;
  open(SRC, "< $srcfile") || die "fix_captions: couldn't open '$srcfile'\n";
  my @contents = <SRC>;
  close(SRC);
  my @fixedcontents = ();

  my $firstline;
  my $class = "";
  my $captionsremoved = 0;
  my $inside_caption = 0;
  # inside_caption is 0 before <property>
  # 1 after <property> and before <string>
  # 2 after <string> if caption should be removed, and before </property>
  foreach my $line (@contents) {
      $class = $1 if ($line =~ m/<class>(.*)<\/class>/);
      if ( $inside_caption == 1 ) {
	  $line =~ m/<string>(.*)<\/string>/ || die "Malformed XML (no string under caption)";
	  my $caption = $1;
	  print "$srcfile: caption='$caption' class='$class'\n" if ($verbose);
	  if ( ( $caption eq $class && !defined $knowncaptions{$caption} ) ||
		 ($caption =~ m/Form[0-9]/) ) {
	      if ( $caption =~ m/^[A-Z][a-z]*$/ ) {
		  print "$srcfile: removing caption '$caption' (warning! could be real caption)\n";
	      } else {
		  print "$srcfile: removing caption '$caption'\n";
	      }
	      $inside_caption = 2;
	      $captionsremoved++;
	  } else {                # Real caption, keep it
	      print "$srcfile: keeping caption '$caption'\n" if ($verbose);
	      push @fixedcontents, $firstline;
	      $inside_caption = 0;
	  }
      }
      if ($line =~ m/property name=\"caption\"/) {
	  $inside_caption = 1;
	  $firstline = $line;
      }
      if ($inside_caption == 0) {
	  push @fixedcontents, $line;
      }
      $inside_caption = 0 if ($inside_caption && $line =~ m/<\/property>/);
  }
  if ($captionsremoved) {
      open(SRC, "> $srcfile") || die "fix_captions: couldn't open '$srcfile' for writing\n";
      print SRC @fixedcontents;
      close(SRC);
  }
}

# Find a .qt_minversion in $dir or any parent directory.
sub read_required_version($)
{
  my $dir = Cwd::abs_path( shift @_ );

  $minversion_maj = $default_minversion_maj;
  $minversion_min = $default_minversion_min;
  while ( length($dir) > 1 ) {
      my $versfile = "$dir/.qt_minversion";
      my $version;
      if ( open (VERSFILE, "< $versfile") ) {
	  while (<VERSFILE>) {
	      $version = $_ if (!/^#/);
	  }
	  close(VERSFILE);
      } else {
	  $versfile = "$dir/configure.in.in";
	  if ( open (VERSFILE, "< $versfile") ) {
	      while (<VERSFILE>) {
		  $version = $1 if m/^#MIN_CONFIG\(([0-9]+.[0-9]+)\)/;
	      }
	      close(VERSFILE);
	  }
      }
      if (defined $version && $version =~ m/([0-9]+)\.([0-9]+)/) {
	  $minversion_maj = $1;
	  $minversion_min = $2;
	  print "Found min version $1.$2 in $versfile\n" if ($verbose);
	  return;
      }
      $dir = dirname($dir);
  }
}

# Process one .ui file
sub process_ui_file($)
{
  my $file = shift @_;
  &read_required_version( dirname($file) );

  print "Checking: $file\n" if($verbose);
  &fix_version($file) if(!$omit_Qt_check);
  &fix_accels($file);
  &fix_captions($file);
}

#############################################################################
# here is the main logic
#

# process files from the command line, if any
if ( $#explicitfiles >= 0 ) {
  foreach my $file( @explicitfiles ) {
    &process_ui_file( $file );
  }
  exit 0;
}

# first generate a list of subdirectories
my @dirlist = ();
push @dirlist, ".";
foreach my $dir ( @dirlist ) {
 opendir (DIR, "$dir") || warn "Couldn't read '$dir'";
 my $subdir = "";
 while( $subdir = readdir(DIR)) {
   next if ($subdir =~ /^\./);
   next if !( -d "$dir/$subdir");
   push @dirlist, "$dir/$subdir";
 }
 closedir(DIR);
}

# now iterate over all subdirs
foreach my $dir(@dirlist) {
  my @uifile = find_ui_files($dir);
  foreach my $file(@uifile) {
    &process_ui_file($file);
  }
}