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- #!/usr/bin/perl
-
- =pod
-
- =head1 NAME
-
- Display - module to display fragments of text on the web and elsewhere
-
- =head1 DESCRIPTION
-
- Display started life as a simple script to concatenate fragments of
- handwritten HTML by date. While it's since haphazardly accumulated
- several of the usual weblog features (comments, lightweight markup, feed
- generation, embedded Perl, poetry tools, stupid dependencies), the present
- module hasn't changed much in six years.
-
- This version should work with FastCGI, via CGI::Fast, if called from the
- appropriate wrapper script.
-
- Entries are stored in a simple directory tree under
- C<$DISPLAY_CONF{ROOT_DIR}>.
-
- Like:
-
- archives/2001/1/1
- archives/2001/1/1/sub_entry
-
- An entry may be either a plain text file, or a directory containing several
- such files + whatever else you'd like to store. If it's a directory, the file
- called "index" will be treated as the text of the entry, and all other lower
- case filenames without extensions will be treated as sub-entries or documents
- within that entry, and displayed accordingly.
-
- Directories may be nested to an arbitrary depth, though I don't promise that
- this won't break on you.
-
- A PNG or JPEG file with a name like
-
- 2001/1/1.icon.png
- 2001/1/1/index.icon.png
- 2001/1/1/whatever.icon.png
-
- will be treated as an icon for the appropriate entry file.
-
- =head2 MARKUP
-
- Entries may consist of hand-written HTML (to be passed along without further
- interpretation), a supported form of lightweight markup, or some combination
- thereof. Actually, an entry may consist of any darn thing you please, as long
- as Perl will agree that it is text, but presumably you're going to be feeding
- this to a browser.
-
- Special markup is indicated by a variety of XML-style container tags.
-
- B<Embedded Perl> - evaluated and replaced by whatever value you return
- (evaluated in a scalar context):
-
- <perl>my $dog = "Ralph."; return $dog;</perl>
-
- This code is evaluated before any other processing is done, so you can return
- any other markup understood by the script and have it handled appropriately.
-
- B<Interpolated variables> - actually keys to %TEMPLATE, for the moment:
-
- <perl>$TEMPLATE{dog} = "Ralph"; return '';</perl>
- <p>My dog is named ${dog}.</p>
-
- Embedded code and variables are mostly intended for use in F<header> and
- F<footer> files, where it's handy to drop in titles or conditionalize aspects
- of a layout. You want to be careful with this sort of thing - it's useful in
- small doses, but it's also a maintainability nightmare waiting to happen.
- (WordPress, I am looking at you.)
-
- B<Several forms of lightweight markup>:
-
- <wala>Wala::Markup, via Wala.pm - very basic wiki syntax</wala>
-
- <textile>Dean Allen's Textile, via Brad Choate's
- Text::Textile.</textile>
-
- <freeverse>An easy way to
- get properly broken lines
- -- en and em dashes ---
- for poetry and such.</freeverse>
-
- B<And a couple of shortcuts>:
-
- <image>filename.ext
- alt text, if any</image>
-
- <list>
- one list item
-
- another list item
- </list>
-
- As it stands, freeverse, image, and list are not particularly robust.
-
- =cut
-
- package Display;
-
- use strict;
- use warnings;
- no warnings 'uninitialized';
-
- use Exporter;
- our @ISA = qw(Exporter);
- our @EXPORT_OK = qw(%WalaConf %DISPLAY_CONF &handle);
- our @EXPORT;
-
- use Image::Size;
- use Text::Textile;
- use XML::Atom::SimpleFeed;
- use Wala qw (%WalaConf %DISPLAY_CONF);
-
- ######################
- # DEFAULT OPTIONS #
- ######################
-
- %DISPLAY_CONF = (
- ROOT_DIR => 'archives', # root dir for archived files
- URL_ROOT => 'http://p1k3.com/', # root URL for building links
- IMAGE_URL_ROOT => 'http://p1k3.com/', # same for images
- HEADER => 'header',
- FOOTER => 'footer',
- );
-
- $WalaConf{'ShowSearchlinks'} = 0;
-
- =head1 SUBROUTINES
-
- For no bigger than this thing is, it gets a little convoluted.
-
- =over
-
- =item handle
-
- Handle a given request, either in the form of a CGI query object
- or a date/entry string.
-
- =cut
-
- sub handle {
- my (@options) = @_;
- my $output;
-
- # Get parameters from any CGI objects we've been given:
- @options = map { expand_query($_) } @options;
-
- # By default, we display the most recent month.
- $options[0] = 'new' unless $options[0];
-
- # Title for head/foot template:
- $DISPLAY_CONF{title} = join(' ', @options);
-
- # Maps 'all' and 'new' to appropriate entries:
- @options = map { expand_option($_) } @options;
-
- my $print_footer;
- unless ($options[0] eq 'feed') {
- # Spit out a header:
- $output .= fragment_slurp($DISPLAY_CONF{HEADER});
- $print_footer = 1;
- }
-
- foreach my $option (@options) {
- # Handle feed with XML::Atom::SimpleFeed:
- if ($option eq 'feed') {
- feed_print( recent_month() );
- last;
- }
- $output .= output($option);
- }
-
- $output .= fragment_slurp($DISPLAY_CONF{FOOTER}) if $print_footer;
-
- return $output;
- }
-
- =item output
-
- Returns appropriate output for a given option.
-
- =cut
-
- sub output {
- my ($option) = @_;
-
- if ( $option =~ m'^[0-9/]{5,11}[a-z_/]+$' ) {
- # nnnn/[nn/nn/]doc_name
- # It's a document within a date.
- return entry_markup(entry_print($option) . datestamp($option));
- }
- elsif ( $option =~ m'^[0-9]{4}/[0-9]{1,2}/[0-9]{1,2}$' ) {
- # nnnn/nn/nn - A specific date. Print it in full.
- return entry_markup(entry_print($option, 'all') . datestamp($option));
- }
- elsif ( $option =~ m'^[0-9]{4}/[0-9]{1,2}$' ) {
- # nnnn/nn - It's a month. Print it.
- return month_print($option);
- }
- elsif ( $option =~ m'^[0-9]{4}$' ) {
- # nnnn - It's a year. Display a list of entries.
- return year_print($option);
- }
- elsif ($option =~ m'^[a-z_]') {
- # Assume it's a document in the root directory.
- return entry_markup(entry_print($option, 'all'));
- }
-
- }
-
-
- =item expand_query
-
- Returns parameters if it's given a CGI object.
-
- =cut
-
- sub expand_query {
- my ($option) = shift;
- if ( (ref($option) eq 'CGI::Fast') or (ref($option) eq 'CGI')) {
- return $option->param('keywords');
- } else {
- return $option;
- }
- }
-
-
- =item expand_option
-
- Expands/converts 'all' and 'new' to appropriate values.
-
- =cut
-
- sub expand_option {
- my ($option) = shift;
-
- # take care of trailing slashes
- chop ($option) if (substr($option, -1, 1) eq '/');
-
- if ($option eq 'all') {
- return dir_list($DISPLAY_CONF{ROOT_DIR},
- 'high_to_low',
- qr/^[0-9]{1,4}$/);
- } elsif ($option eq 'new') {
- return recent_month();
- } else {
- return $option;
- }
-
- }
-
- =item recent_month
-
- Tries to find the most recent month in the archive.
-
- If a year file is text, returns that instead.
-
- =cut
-
- sub recent_month {
-
- # Get the time, format the couple of variables I'll actually use.
-
- # my ($sec, $min, $hour, $mday, $mon,
- # $year, $wday, $yday, $isdst) = localtime(time);
-
- my ($dir) = $DISPLAY_CONF{ROOT_DIR};
- my ($mon, $year) = (localtime(time))[4,5];
-
- $mon++;
- $year += 1900;
-
- if (-e "$dir/$year/$mon") {
- return "$year/$mon";
- }
- else {
-
- my @year_files = dir_list ($dir, 'high_to_low', qr/^[0-9]{1,4}$/);
-
- if (-T "$dir/$year_files[0]") {
- return $year_files[0];
- }
-
- my @month_files = dir_list ("$dir/$year_files[0]", 'high_to_low',
- qr/^[0-9]{1,2}$/);
-
- return "$year_files[0]/$month_files[0]";
- }
-
- }
-
- =item dir_list
-
- Return a $sort_order sorted list of files matching regex $pattern in a
- directory.
-
- Calls $sort_order, which can be one of:
-
- alpha - alphabetical
- reverse_alpha - alphabetical, reversed
- high_to_low - numeric, high to low
- low_to_high - numeric, low to high
-
- =cut
-
- sub dir_list {
- my ($dir, $sort_order, $file_pattern) = @_;
-
- $file_pattern = qr/^[0-9]{1,2}$/ unless ($file_pattern);
- $sort_order = 'high_to_low' unless ($sort_order);
-
- opendir LIST_DIR, $dir
- or die "Couldn't open $dir: $!";
- my @files = sort $sort_order
- grep { m/$file_pattern/ }
- readdir LIST_DIR;
- closedir LIST_DIR;
-
- #@files = sort $sort_order @files;
-
- return @files;
- }
-
- # various named sorts for dir_list
- sub alpha { $a cmp $b; } # alphabetical
- sub high_to_low { $b <=> $a; } # numeric, high to low
- sub low_to_high { $a <=> $b; } # numberic, low to high
- sub reverse_alpha { $b cmp $a; } # alphabetical, reversed
-
-
- =item year_print
-
- List out the updates for a year.
-
- =cut
-
- sub year_print {
- my ($year) = @_;
- my $result;
-
- if (-d "$DISPLAY_CONF{ROOT_DIR}/$year") {
-
- if (-T "$DISPLAY_CONF{ROOT_DIR}/$year/index") {
- $result .= entry_print($year);
- }
-
- my $header_text = icon_markup($year, $year);
- $header_text = '' unless $header_text; # stupid
- $result .= "<h3>$header_text $year</h3>";
-
- my @month_files = dir_list ("$DISPLAY_CONF{ROOT_DIR}/$year",
- 'high_to_low',
- qr/^[0-9]{1,2}$/);
-
- $result .= "\n<table>\n";
- my $update_count = 0; # explicitly define for later printing.
- foreach my $month_file (@month_files) {
- my @update_files = dir_list ("$DISPLAY_CONF{ROOT_DIR}/$year/$month_file",
- 'low_to_high', qr/^[0-9]{1,2}$/);
-
- # Add the count of files to $update_count.
- $update_count += @update_files;
-
- $result .= '<tr> <td class="datelink">'
- . a("$DISPLAY_CONF{URL_ROOT}$year/$month_file", month_name($month_file))
- . "</td> <td class=\"datelink\">\n"
- . "( <small>";
-
- foreach my $update_file (@update_files) {
- $result .= a("$DISPLAY_CONF{URL_ROOT}$year/$month_file/$update_file",
- $update_file) . "\n";
- }
- $result .= "</small> )</td> </tr>\n\n";
- }
- $result .= "</table>\n";
-
- $result .= "<p>$update_count ";
-
- if ($update_count > 1) {
- my ($monthly_average) = int($update_count / @month_files);
- $result .= " entries, roughly $monthly_average an active month.";
- }
- elsif ($update_count == 0) { $result .= " entries"; }
- elsif ($update_count == 1) { $result .= " entry"; }
-
- $result .= '</p>';
-
- } elsif (-T "$DISPLAY_CONF{ROOT_DIR}/$year") {
- $result .= entry_print($year);
- } else {
- $result .= '<p>No such year.</p>';
- }
-
- return entry_markup($result);
- }
-
- =item month_print
-
- Prints the entries in a given month (nnnn/nn).
-
- =cut
-
- sub month_print {
- my ($month) = @_;
- my $month_file = "$DISPLAY_CONF{ROOT_DIR}/$month";
- my $result;
-
- # If a directory exists for $month, use dir_list to grab
- # the entry files it contains into @entry_files, sorted
- # numerically. Then send each entry to entry_print.
- if (-d $month_file) {
- if (-T "$month_file/index") {
- $result .= entry_print($month);
- }
-
- my @entry_files = dir_list ($month_file, 'high_to_low',
- qr/^[0-9]{1,2}$/);
-
- foreach my $entry_file (@entry_files) {
- $result .= entry_markup( entry_print("$month/$entry_file")
- . datestamp("$month/$entry_file") );
- }
- } elsif (-T $month_file) {
- $result .= entry_print($month);
- }
-
- return $result;
- }
-
- =item entry_print
-
- Prints the contents of a given entry. Calls datestamp, fragment_print,
- dir_list, and icon_markup. Recursively calls itself.
-
- =cut
-
- sub entry_print {
- my ($entry, $level) = @_;
- $level = 'index' unless $level;
- my ($result);
-
- # location of entry on local filesystem, and its URL:
- my $entry_loc = "$DISPLAY_CONF{ROOT_DIR}/$entry";
- my $entry_url = $DISPLAY_CONF{URL_ROOT} . $entry;
-
- # display an icon, if we have one:
- if ( my $ico_markup = icon_markup($entry) ) {
- $result .= "<h2>$ico_markup</h2>\n\n";
- }
-
- if (-T $entry_loc) {
- # is text, slurp it and return
- return $result . fragment_slurp($entry_loc);
- } elsif (-d $entry_loc) {
-
- # print index as head
- $result .= fragment_slurp ("$entry_loc/index");
-
- my @sub_entries = dir_list ($entry_loc, 'alpha',
- qr/^[a-z_]+(\.(tgz|zip|tar[.]gz|gz))?$/);
-
- # followed by any sub-entries:
-
- my %ignore_entries = ('index' => 1);
-
- if ( $level eq 'index' and @sub_entries > 1 ) {
- # if we're just supposed to print an index
- # spit out icons or text links for extra files
- my $contents;
-
- foreach my $se (@sub_entries) {
- next if ($ignore_entries{$se});
- my $linktext = icon_markup("$entry/$se", $se);
- $linktext = $se unless $linktext;
- $contents .= qq{<a href="$DISPLAY_CONF{URL_ROOT}$entry/$se" }
- . qq{title="$se">$linktext</a>\n};
- }
-
- $result .= "<p><em><strong>more</strong></em>: $contents</p>\n";
- } elsif ( $level eq 'all' and @sub_entries > 1 ) {
-
- # but if we're supposed to print everything in the directory
- # and if there's more there than just the index file,
-
- foreach my $se (@sub_entries) {
- next if $ignore_entries{$se}; # skip stoplist
-
- # print each of the other files, separated by little headers
- $result .= "\n\n<p>{"
- . a("$DISPLAY_CONF{URL_ROOT}$entry/$se", $se)
- . "}</p>\n\n";
-
- # skipping any archives
- next if ($se =~ m/[.](tgz|zip|tar[.]gz|gz)$/);
-
- $result .= entry_print("$entry/$se");
- }
-
- }
-
- }
-
- return $result;
- }
-
- =item icon_markup
-
- Check if an icon exists for a given entry if so, return markup to include it.
- Icons are PNG or JPEG image files following a specific naming convention:
-
- index.icon.[png|jp(e)g] for directories
- [filename].icon.[png|jp(e)g] for flat text files
-
- Calls image_size, uses filename to determine type.
-
- =cut
-
- sub icon_markup {
- my ($entry, $alt) = @_;
- $alt = '' unless $alt; # default to nothing
- my ($entry_loc) = "$DISPLAY_CONF{ROOT_DIR}/$entry";
- my ($entry_url) = "$DISPLAY_CONF{IMAGE_URL_ROOT}${entry}";
-
- my ($icon_loc, $icon_url);
-
- if (-T $entry_loc) {
- $icon_loc = "$entry_loc.icon";
- $icon_url = "$entry_url.icon";
- }
- elsif (-d $entry_loc) {
- $icon_loc = "$entry_loc/index.icon";
- $icon_url = "$entry_url/index.icon";
- }
-
- # put a list of icon image types to check for here
- # (first one found will be used)
- my (@suffixes) = qw(png gif jpg jpeg);
- my $suffix = "";
- for (@suffixes) {
- if (-e "$icon_loc.$_") {
- $suffix = $_;
- last;
- }
- }
-
- # fail unless there's a file with one of the above suffixes
- return 0 unless $suffix;
-
- # call image_size to slurp width & height from the image file
- my ($width, $height) = image_size("$icon_loc.$suffix");
-
- return qq{<img src="$icon_url.$suffix"\n width="$width" }
- . qq{height="$height"\n alt="$alt" />};
- }
-
- =item datestamp
-
- Returns a nice html datestamp for a given entry, including a wikilink for
- discussion and suchlike.
-
- =cut
-
- sub datestamp {
- my ($entry, $markup_start, $markup_end) = @_;
-
- unless ($markup_start and $markup_end) {
- $markup_start = "\n<p class=\"datelink\">";
- $markup_end = "</p>\n";
- }
-
- my ($stamp);
- if ( $entry =~ m/(^[0-9]{4}\/[0-9]{1,2}\/[0-9]{1,2})/ ) {
-
- my ($entry_year, $entry_month, $entry_day) = split (/\//, $1);
-
- # this stuff conditionalizes the wikilink
- # so that if nothing exists, you wind up with an edit form
- my ($wiki_date_name) = month_name($entry_month) .
- "_${entry_day}_${entry_year}";
- my $wikistamp;
- if (-e "$WalaConf{PagesDir}/${wiki_date_name}") {
- $wikistamp = qq{:: <a title="a page you can edit"}
- . qq{\n href="$WalaConf{ScriptName}?$wiki_date_name">read the margins</a>};
- } else {
- $wikistamp = qq{:: <a title="a page you can edit"}
- . qq{\n href="$WalaConf{ScriptName}?$wiki_date_name">write in the margins</a>};
- }
-
- # return a fancy datestamp.
-
- my $month_name = month_name($entry_month);
- my $year_url = "$DISPLAY_CONF{URL_ROOT}$entry_year";
- $stamp = <<STAMP;
- $markup_start
- <a href="$year_url"
- title="$entry_year">$entry_year</a>
- <a href="$year_url/$entry_month"
- title="$entry_year/$entry_month">$month_name</a>
- <a href="$year_url/$entry_month/$entry_day"
- title="$entry_year/$entry_month/$entry_day">$entry_day</a>
- $wikistamp
- $markup_end
- STAMP
-
- } else {
- $stamp = "$markup_start(failed to construct datestamp for $entry)$markup_end";
- }
-
- return ($stamp);
- }
-
- =item fragment_print
-
- Print a text fragment - a header, footer, update, etc.
- Called by main routines, used to print headers and footers.
- Calls fragment_slurp to get the fragment it's supposed to print.
- Returns 1 on successful completion, 0 otherwise.
-
- =cut
-
- sub fragment_print {
- my ($file) = @_;
-
- my $lines = fragment_slurp($file);
-
- if (length($lines)) {
- print $lines;
- } else {
- return '';
- }
- }
-
- =item fragment_slurp
-
- Read a text fragment, call line_parse to take care of funky markup and
- interpreting embedded code, and then return it as a string. Takes one
- parameter, the name of the file, and returns '' if it's not an extant text
- file.
-
- This might be the place to implement an in-memory cache for FastCGI or mod_perl
- environments. The trick is that the line_parse() results for certain files
- shouldn't be cached because they contain embedded code.
-
- =cut
-
- sub fragment_slurp {
- my ($file) = @_;
-
- # if $file is text
- if (-T $file) {
- my $everything;
-
- open (my $fh, '<', $file) or return '';
- {
- # line sep
- local $/ = undef;
- $everything = <$fh>;
- }
- close $fh;
-
- # Take care of any special markup.
- # We pass along $file so it has some context to work with
-
- return line_parse ($everything, $file);
-
- } else {
- return '';
- }
- }
-
- =item line_parse
-
- Performs substitutions on lines called by fragment_slurp, at least. Calls
- image_markup, Text::Textile, Wala::wiki_page_to_html, eval_perl. Returns
- string.
-
- Parses some special markup, specifically:
-
- <perl>embedded perl</perl>
- ${variable} interpolation from %DISPLAY_CONF
- <textile></textile> - Text::Textile to HTML
- <wala></wala> - Wala::wikify();
- <freeverse></freeverse>
- <retcon></retcon>
- <list></list>
-
- <image>filename.ext
- optional alt tag</image>
-
- =cut
-
- { # Some useful definitions to have on hand.
- my %tags = ( retcon => 'div class="retcon"',
- freeverse => 'p',
- list => "ul>\n<li" );
-
- my %end_tags = ( retcon => 'div',
- freeverse => 'p',
- list => "li>\n</ul" );
-
- my %blank_lines = ( freeverse => "</p>\n\n<p>",
- list => "</li>\n\n<li>" );
-
- my %newlines = ( freeverse => "<br />\n" );
-
- my %dashes = ( freeverse => ' — ' );
-
- sub line_parse {
- my ($everything, $file) = (@_);
-
- # eval embedded Perl and ${variables}:
- eval_perl($everything);
-
- # take care of wala markup
- $everything =~ s/<wala>(.*?)<\/wala>/Wala::wikify($1)/seg;
-
- # take care of textile markup, if we've got any
- textile_process($everything);
-
- # evaluate <image> tags.
- $everything =~ s!<image>(.*?)</image>!image_markup($file, $1)!seg;
-
- foreach my $key (keys %tags) {
- # Set some replacements, unless they've been explicitly set already.
- $end_tags{$key} = $tags{$key} unless $end_tags{$key};
- $blank_lines{$key} = "\n\n" unless $blank_lines{$key};
- $newlines{$key} = "\n" unless $newlines{$key};
- $dashes{$key} = " -- " unless $dashes{$key};
-
- while ($everything =~ m/(<$key>.*?<\/$key>)/s) {
- my $block = $1;
-
- # save the bits between instances of the block --
- my (@interstice_array) = split (/\Q$block\E/s, $everything);
-
- # now, transform the contents of the block we've found:
-
- # tags that surround the block
- $block =~ s/\n?<$key>\n?/<$tags{$key}>/gs;
- $block =~ s!\n?</$key>\n?!</$end_tags{$key}>!gs;
-
- # dashes
- $block =~ s/(\s+)\-{2}(\n|\s+|$)/$1$dashes{$key}$2/gs;
-
- # blank lines within the block
- $block =~ s/\n\n/$blank_lines{$key}/gs;
-
- # single newlines (i.e., line ends) within the block
- # except those preceded by a double-quote, which probably
- # indicates a still-open tag:
- $block =~ s/([^"\n])\n([^\n])/$1$newlines{$key}$2/gs;
-
- # and slap it all back together as $everything
- $everything = join $block, @interstice_array;
-
- }
- }
-
- return $everything;
- }
- }
-
- =item textile_process
-
- Inline replace <textile> markup in a string.
-
- Trying to implement some caching here, though it's questionable whether
- this makes any sense. There's also a closure which should retain the
- Text::Textile object between invocations, potentially saving some time at
- the expense of a little memory.
-
- =cut
-
- { my %cache;
- my $textile = undef;
-
- sub textile_process {
- my $replacement;
-
- unless (defined $textile) {
- # head_offset: use h1., h2. in Textile formatting:
- $textile = Text::Textile->new( head_offset => 2 );
- }
-
- while ( $_[0] =~ m/<textile>(.*?)<\/textile>/sx ) {
- my $block = $1;
-
- if (exists $cache{$block}) {
- $replacement = $cache{$block};
- } else {
- $replacement = $textile->process($block);
- $cache{$block} = $replacement;
- }
-
- $_[0] =~ s/<textile>\Q$block\E<\/textile>/$replacement/sg;
- }
-
- }
- }
-
- =item eval_perl
-
- Evaluate embedded Perl in a string, replacing blocks enclosed with <perl> tags
- with whatever they return (well, evaluated in a scalar context). Modifies
- a string in-place, so be careful.
-
- Also handles simple ${variables}, replacing them (for now) from %DISPLAY_CONF
- values.
-
- =cut
-
- sub eval_perl {
-
- while ($_[0] =~ m/<perl>(.*?)<\/perl>/s) {
- my $block = $1;
-
- my $output = eval $block;
-
- if ($@) {
- # got an error
- $_[0] =~ s/<perl>\Q$block\E<\/perl>/$@/s;
- } else {
- # include anything returned from $block
- $_[0] =~ s/<perl>\Q$block\E<\/perl>/$output/s;
- }
- }
-
- # interpolate variables
- $_[0] =~ s/\${([a-zA-Z_]+)}/$DISPLAY_CONF{$1}/ge;
-
- return;
- }
-
-
- =item image markup
-
- Parse out an image tag and return the appropriate html.
-
- =cut
-
- sub image_markup {
- my ($file, $block) = @_;
-
- # get a directory for the file we're working with
- $file =~ s'[^/]* # everything not a /
- $ # up to end of string
- ''x;
-
- # truncated file date that just includes date + sub docs
- my ($file_date) = $file =~ m'([0-9]{4}/ # year
- [0-9]{1,2}/ # month
- [0-9]{1,2}/ # day
- ([a-z]*/)*)$ # sub-entries
- 'x;
-
- my ($image_name, $alt_text, $title_text) = split /\n/, $block;
- $title_text = $alt_text unless $title_text;
-
- my $image_file;
- if (-e "$file/$image_name" ) {
- $image_file = "$file/$image_name";
- $image_name = "${file_date}${image_name}";
- } elsif (-e "$DISPLAY_CONF{ROOT_DIR}/$image_name") {
- $image_file = "$DISPLAY_CONF{ROOT_DIR}/$image_name";
- }
-
- # get width & height in pixels for known filetypes
- my ($width, $height) = image_size($image_file);
-
- # may need to change this if rewrites don't work
- return qq|<img src="$DISPLAY_CONF{IMAGE_URL_ROOT}$image_name"\n height="$height"|
- . qq|\n width="$width"\n alt="$alt_text"\n title="$title_text" />|;
- }
-
-
- =item month_name
-
- Turn numeric dates into English.
-
- =cut
-
- sub month_name {
- my ($number) = @_;
-
- # "Null" is here so that $month_name[1] corresponds to January, etc.
- my @months = qw(Null January February March April May June
- July August September October November December);
-
- return $months[$number];
- }
-
-
- =item feed_print
-
- Dump out an Atom feed of entries for a month.
-
- Called from handle(), requires XML::Atom::SimpleFeed.
-
- =cut
-
- sub feed_print {
- my $month = shift;
-
- # create a feed object
- my $feed = XML::Atom::SimpleFeed->new(
- title => $DISPLAY_CONF{title},
- link => $DISPLAY_CONF{URL_ROOT},
- link => { rel => 'self', href => $DISPLAY_CONF{feed_url}, },
- icon => $DISPLAY_CONF{favicon_url},
- author => $DISPLAY_CONF{author},
- id => $DISPLAY_CONF{URL_ROOT},
- );
-
- # If a directory exists for $month, use dir_list to grab
- # the entry files it contains into @entry_files, sorted
- # numerically. Then send each entry to entry_print.
-
- my @entry_files;
-
- if (-d "$DISPLAY_CONF{ROOT_DIR}/$month") {
- (@entry_files) = dir_list ("$DISPLAY_CONF{ROOT_DIR}/$month",
- 'high_to_low',
- qr/^[0-9]{1,2}$/);
- } else {
- return 0;
- }
-
- foreach my $entry_file (@entry_files) {
- # Going to feed this to SimpleFeed.
- my $content = entry_print("$month/$entry_file");
-
- $feed->add_entry(
- title => "$month/$entry_file",
- link => $DISPLAY_CONF{URL_ROOT} . "$month/$entry_file",
- id => $DISPLAY_CONF{URL_ROOT} . "$month/$entry_file",
- content => $content,
- );
-
- }
-
- print "Content-type: application/atom+xml\n\n";
- $feed->print;
- return 1;
-
- }
-
-
- =item entry_markup
-
- Return text wrapped in the appropriate markup for an entry. Just a wrapper
- around div() at the moment.
-
- =cut
-
- sub entry_markup {
- my ($text) = @_;
- return div($text, 'entry') . "\n";
- }
-
-
- =item div
-
- Return text wrapped in a div of the specified class.
-
- =cut
-
- sub div {
- my ($text, $class) = @_;
- my ($top, $result);
-
- if ($class) {
- $top = "<div class=\"$class\">\n";
- } else {
- $top = "<div>\n";
- }
-
- return ( $top . $text . "\n</div>\n" );
- }
-
-
- =item a
-
- Returns an HTML link.
-
- =cut
-
- sub a {
- my ($url, $text) = @_;
- return "<a href=\"$url\">$text</a>";
- }
-
-
- =item ornament
-
- Returns a type ornament.
-
- =cut
-
- sub ornament {
- return '<small>§</small>';
- }
-
-
- =item image_size
-
- Returns (width, height) of a variety of image files. Called by icon_markup and
- line_parse. Uses Image::Size if available, otherwise uses a couple of built-in
- routines munged together from pngsize and jpegsize in wwwis, by Alex Knowles
- and Andrew Tong.
-
- =cut
-
- sub image_size {
- my ($image_file) = shift;
-
- # Use Image::Size - this needs to be actually conditionalized.
-
- my ($x, $y, $type);
- ($x, $y, $type) = imgsize($image_file);
- return ($x, $y);
-
- # Otherwise we want to use our built-in routines:
-
- my ($head);
-
- if ( !open(IMAGE, '<', $image_file) ) {
- print STDERR "can't open IMG $image_file";
- return (0, 0);
- } else {
- binmode IMAGE;
- if ($image_file =~ m/\.png$/) { # it's a PNG
- my ($a, $b, $c, $d, $e, $f, $g, $h) = 0;
-
- if (defined($image_file)
- && read(IMAGE, $head, 8) == 8
- && ($head eq "\x8a\x4d\x4e\x47\x0d\x0a\x1a\x0a" ||
- $head eq "\x89\x50\x4e\x47\x0d\x0a\x1a\x0a")
- && read(IMAGE, $head, 4) == 4
- && read(IMAGE, $head, 4) == 4
- && ($head eq "MHDR" || $head eq "IHDR")
- && read(IMAGE, $head, 8) == 8) {
- # ($x, $y) = unpack("I"x2, $head);
- # doesn't work on little-endian machines
- # return ($x,$y);
- ($a,$b,$c,$d,$e,$f,$g,$h) = unpack ("C"x8, $head);
- return ($a<<24|$b<<16|$c<<8|$d, $e<<24|$f<<16|$g<<8|$h);
- }
- } elsif ($image_file =~ m/\.jpe?g$/) { # it's a JPEG
- my($done) = 0;
- my($c1,$c2,$ch,$s,$length, $dummy) = (0,0,0,0,0,0);
- my($a,$b,$c,$d);
-
- if (defined($image_file)
- && read(IMAGE, $c1, 1)
- && read(IMAGE, $c2, 1)
- && ord($c1) == 0xFF
- && ord($c2) == 0xD8) {
- while (ord($ch) != 0xDA && !$done) {
- # Find next marker (JPEG markers begin with 0xFF)
- # This can hang the program!!
- while (ord($ch) != 0xFF) {
- return(0,0) unless read(IMAGE, $ch, 1);
- }
-
- # JPEG markers can be padded with unlimited 0xFF's
- while (ord($ch) == 0xFF) {
- return(0,0) unless read(IMAGE, $ch, 1);
- }
-
- # Now, $ch contains the value of the marker.
- if ((ord($ch) >= 0xC0) && (ord($ch) <= 0xC3)) {
- return(0,0) unless read (IMAGE, $dummy, 3);
- return(0,0) unless read(IMAGE, $s, 4);
- ($a,$b,$c,$d)=unpack("C"x4,$s);
- return ($c<<8|$d, $a<<8|$b );
- } else {
- # We **MUST** skip variables, since FF's within
- # variable names are NOT valid JPEG markers
- return(0,0) unless read (IMAGE, $s, 2);
- ($c1, $c2) = unpack("C"x2,$s);
- $length = $c1<<8|$c2;
- last if (!defined($length) || $length < 2);
- read(IMAGE, $dummy, $length-2);
- }
- }
- }
- }
-
- return (0,0);
- }
- }
-
- =back
-
- =head1 SEE ALSO
-
- walawiki.org, Blosxom, rassmalog, Text::Textile, XML::Atom::SimpleFeed,
- Image::Size, CGI::Fast.
-
- =head1 AUTHOR
-
- Copyright 2001-2007 Brennen Bearnes
-
- Image sizing code (in image_size) derived from wwwis, by Alex Knowles and
- Andrew Tong.
-
- display.pl is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- =cut
-
- 1;
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