1 | ###########################################################################
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2 | #
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3 | # ConvertToPlug.pm -- plugin that inherits from HTML or TEXT Plug, depending
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4 | # on plugin argument convert_to
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5 | #
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6 | # A component of the Greenstone digital library software
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7 | # from the New Zealand Digital Library Project at the
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8 | # University of Waikato, New Zealand.
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9 | #
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10 | # Copyright (C) 1999 New Zealand Digital Library Project
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11 | #
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12 | # This program is free software; you can redistribute it and/or modify
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13 | # it under the terms of the GNU General Public License as published by
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14 | # the Free Software Foundation; either version 2 of the License, or
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15 | # (at your option) any later version.
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16 | #
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17 | # This program is distributed in the hope that it will be useful,
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18 | # but WITHOUT ANY WARRANTY; without even the implied warranty of
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19 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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20 | # GNU General Public License for more details.
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21 | #
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22 | # You should have received a copy of the GNU General Public License
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23 | # along with this program; if not, write to the Free Software
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24 | # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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25 | #
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26 | ###########################################################################
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27 |
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28 | # The plugin is inherited by such plugins as WordPlug and PDFPlug.
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29 | # It facilitates the conversion of these document types to either HTML
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30 | # or TEXT by setting up variable that instruct ConvertToBasPlug
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31 | # how to work.
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32 |
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33 | # It works by dynamically inheriting HTMLPlug or TEXTPlug based on
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34 | # the plugin argument 'convert_to'. If the argument is not present,
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35 | # the default is to inherit HTMLPlug.
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36 |
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37 |
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38 | package ConvertToPlug;
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39 |
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40 | use BasPlug;
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41 | use HTMLPlug;
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42 | use TEXTPlug;
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43 |
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44 | sub BEGIN {
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45 | @ISA = ('HTMLPlug');
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46 | # @ISA = ('HTMLPlug', 'TEXTPlug');
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47 | # @ISA = ('BasPlug'); #, 'HTMLPlug', 'TEXTPlug');
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48 | }
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49 |
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50 | use strict;
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51 |
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52 | sub print_usage {
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53 | my ($plugin_name) = @_;
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54 |
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55 | # for when this function is called directly by pluginfo.pl
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56 | if (ref ($plugin_name)) {
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57 | $plugin_name = ref ($plugin_name);
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58 | }
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59 |
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60 | print STDERR "\n usage: plugin $plugin_name [options]\n\n";
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61 | print STDERR " options:\n";
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62 | print STDERR " -convert_to (html|text) plugin converts to TEXT or HTML\n";
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63 | print STDERR " (default html)\n";
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64 | }
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65 |
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66 | sub parse_args
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67 | {
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68 | my $class = shift (@_);
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69 | my ($args) = @_;
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70 |
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71 | my $plugin_name = $class;
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72 | $plugin_name =~ s/\.pm$//;
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73 |
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74 | my $generate_format;
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75 | if (!parsargv::parse($args,
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76 | q^convert_to/(html|text)/html^, \$generate_format,
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77 | "allow_extra_options")) {
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78 |
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79 | print STDERR "\nIncorrect options passed to $plugin_name, ";
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80 | print STDERR "check your collect.cfg configuration file\n";
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81 | &print_usage($plugin_name);
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82 | die "\n";
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83 | }
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84 |
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85 | return ($plugin_name,$generate_format);
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86 | }
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87 |
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88 | sub new {
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89 | my $class = shift (@_);
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90 | my ($plugin_name,$generate_format) = $class->parse_args(\@_);
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91 | my $self;
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92 |
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93 | if ($generate_format eq "text")
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94 | {
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95 | $self = new TEXTPlug ($class, @_);
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96 | $self->{'convert_to'} = "TEXT";
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97 | $self->{'convert_to_ext'} = "txt";
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98 | }
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99 | else
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100 | {
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101 | $self = new HTMLPlug ($class, @_);
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102 | $self->{'convert_to'} = "HTML";
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103 | $self->{'convert_to_ext'} = "html";
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104 |
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105 | $self->{'rename_assoc_files'} = 1;
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106 | $self->{'metadata_fields'} .= ",GENERATOR";
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107 | }
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108 |
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109 | return bless $self, $class;
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110 | }
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111 |
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112 |
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113 |
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114 | # Run conversion utility on the input file.
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115 | #
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116 | # The conversion takes place in a collection specific 'tmp' directory so
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117 | # that we don't accidentally damage the input.
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118 | #
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119 | # The desired output type is indicated by $output_ext. This is usually
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120 | # something like "html" or "word", but can be "best" (or the empty string)
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121 | # to indicate that the conversion utility should do the best it can.
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122 |
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123 | sub tmp_area_convert_file {
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124 | my $self = shift (@_);
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125 | my ($output_ext,$input_filename, $textref) = @_;
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126 |
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127 | my $convert_to = $self->{'convert_to'};
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128 |
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129 | # softlink to collection tmp dir
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130 | my $colname = &util::use_collection();
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131 | my $tmp_dirname
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132 | = &util::filename_cat($ENV{'GSDLHOME'},"collect",$colname,"tmp");
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133 | &util::mk_dir($tmp_dirname) if (!-e $tmp_dirname);
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134 |
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135 | # derive tmp filename from input filename
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136 | my ($tailname,$dirname,$suffix)
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137 | = File::Basename::fileparse($input_filename,'\.[^\.]+$');
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138 |
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139 | my $tmp_filename = &util::filename_cat($tmp_dirname,"$tailname$suffix");
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140 | # Remove any white space from filename -- no risk of name collision, and
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141 | # makes later conversion by utils simpler
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142 | $tmp_filename =~ s/\s+//g;
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143 |
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144 | &util::soft_link($input_filename,$tmp_filename);
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145 |
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146 | my $verbosity = $self->{'verbosity'};
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147 | if ($verbosity>0)
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148 | {
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149 | print STDERR "Converting $tailname$suffix to $convert_to format\n";
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150 | }
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151 |
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152 | # Execute the conversion command and get the type of the result,
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153 | # making sure the converter gives us the appropriate output type
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154 | my $output_type = lc($convert_to);
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155 | my $cmd = "gsConvert.pl -verbose $verbosity -output $output_type \"$tmp_filename\"";
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156 | $output_type = `$cmd`;
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157 |
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158 | # Check STDERR here
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159 |
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160 | chomp $output_type;
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161 | if ($output_type eq "fail") {
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162 | print STDERR "Could not convert $tailname$suffix to $convert_to format\n";
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163 | return "";
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164 | ### exit 1;
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165 | }
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166 |
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167 | # remove symbolic link to original file
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168 | &util::rm($tmp_filename);
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169 |
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170 | # store the *actual* output type and return the output filename
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171 | $self->{'convert_to_ext'} = $output_type;
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172 | my $output_filename = $tmp_filename;
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173 | $output_filename =~ s/$suffix$/.$output_type/;
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174 |
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175 | return $output_filename;
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176 | }
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177 |
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178 |
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179 | # Remove collection specific tmp directory and all its contents.
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180 |
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181 | sub cleanup_tmp_area {
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182 | my $self = shift (@_);
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183 |
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184 | my $colname = &util::use_collection();
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185 | my $tmp_dirname
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186 | = &util::filename_cat($ENV{'GSDLHOME'},"collect",$colname,"tmp");
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187 | &util::rm_r($tmp_dirname);
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188 | &util::mk_dir($tmp_dirname);
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189 | }
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190 |
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191 |
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192 |
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193 | # Override BasPlug read_file
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194 |
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195 | sub read_file {
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196 | my $self = shift (@_);
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197 | my ($src_filename, $textref) = @_;
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198 |
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199 | my $output_ext = $self->{'convert_to_ext'};
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200 | my $conv_filename = $self->tmp_area_convert_file($output_ext,$src_filename);
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201 | if ("$conv_filename" eq "") {return "";} # allows continue on errors
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202 | $self->{'conv_filename'} = $conv_filename;
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203 |
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204 | BasPlug::read_file($self,$conv_filename,$textref);
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205 | }
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206 |
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207 |
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208 | # Override BasPlug read
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209 |
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210 | sub read {
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211 | my $self = shift (@_);
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212 |
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213 | my $ret_val = BasPlug::read($self,@_);
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214 |
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215 | $self->cleanup_tmp_area();
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216 |
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217 | return $ret_val;
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218 | }
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219 |
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220 |
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221 | # do plugin specific processing of doc_obj for HTML type
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222 | sub process_type {
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223 | my $self = shift (@_);
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224 | my ($doc_ext, $textref, $pluginfo, $base_dir, $file, $metadata, $doc_obj) = @_;
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225 |
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226 | my $conv_filename = $self->{'conv_filename'};
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227 | my $tmp_dirname = File::Basename::dirname($conv_filename);
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228 | my $tmp_tailname = File::Basename::basename($conv_filename);
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229 |
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230 | my $convert_to = $self->{'convert_to'};
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231 | my $ret_val;
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232 |
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233 | if ($convert_to eq "TEXT")
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234 | {
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235 |
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236 | $ret_val = TEXTPlug::process($self,$textref,$pluginfo,
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237 | $tmp_dirname,$tmp_tailname,
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238 | $metadata,$doc_obj);
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239 | }
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240 | else
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241 | {
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242 | $ret_val = HTMLPlug::process($self,$textref,$pluginfo,
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243 | $tmp_dirname,$tmp_tailname,
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244 | $metadata,$doc_obj);
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245 | }
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246 |
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247 | # associate original file with doc object
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248 | my $cursection = $doc_obj->get_top_section();
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249 | my $filename = &util::filename_cat($base_dir,$file);
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250 | $doc_obj->associate_file($filename, "doc.$doc_ext", undef, $cursection);
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251 |
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252 | my $doclink = "<a href=_httpcollection_/index/assoc/[archivedir]/doc.$doc_ext>";
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253 | $doc_obj->add_utf8_metadata ($cursection, "srclink", $doclink);
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254 | $doc_obj->add_utf8_metadata ($cursection, "srcicon", "_icon".$doc_ext."_");
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255 | $doc_obj->add_utf8_metadata ($cursection, "/srclink", "</a>");
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256 |
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257 | return $ret_val;
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258 | }
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259 |
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260 | 1;
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