datapress/head.php at master · haystack/datapress · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
<!-- ========~~~~~-------- begin DATAPRESS header --------~~~~~========  -->
<?php

error_reporting(E_ALL);
ini_set('display_errors', True);

/*
 * This file is run from within the <HEAD> element of a WordPress page load.
 * It determines what content to place in the head, and uses the helper methods
 * in head-lib.php to accomplish that.
 */
include('head-lib.php');

/*
 * The wp_query variable lets us access the data for the current post.
 */
global $wp_query;

/*
 * The lightboxed_exhibit contains an Exhibit if we're currently in a lightbox.
 */
global $lightboxed_exhibit;

/*
 * This is the helper library for putting things into the HEAD element.
 * The task is to determine when and what to put in.
 */
$datapressHead = new DatapressHead();

/*
 * We'll use this array to contain the exhibits we need to print info for.
 */
global $exhibits_to_show;
$exhibits_to_show = array();

/*
 * Currently Inside an Exhibit-Only Page
 * This is true if we're currently inside a lightbox;
 */
$currently_inside_exhibit_only_page = (isset($lightboxed_exhibit) && ($lightboxed_exhibit != NULL));

/* -------------------------------------
 * Step 1: Load the Exhibits we're interested in.
 * -------------------------------------
 */

if (isset($lightboxed_exhibit) && ($lightboxed_exhibit != NULL)) {
  /*
   * CASE 1: exhibit-only page (see: wp-exhibit-only.php)
   *
   * We're in an exhibit-only page while executing this.
   * There's only one exhibit, so we just push it to the exhibits_to_show array.
   */
  array_push($exhibits_to_show, $lightboxed_exhibit);
} else {
  /*
   * CASE 2: WordPress page
   *
   * We're in a regular wordpress page, so we have to inspect the posts that
   * are being shown and add the exhibit for each post.
   */

  // Look at each post.
  if ($wp_query->posts > 0) {
    foreach($wp_query->posts as $post) {
      if ($post->datapress_exhibit) {
        array_push($exhibits_to_show, $post->datapress_exhibit);
      }
    }
  }
}

/* -------------------------------------
 * Step 2: Print the appropriate data to the HEAD of the page.
 * -------------------------------------
 */

if (count($exhibits_to_show) == 0) {
  /*
   * CASE 1: No exhibits to show.
   *
   * Do nothing!
   */
} else if (count($exhibits_to_show) == 1) {
  /*
   * CASE 2: One exhibit to show.
   */

  $exhibit = $exhibits_to_show[0];
  if ($currently_inside_exhibit_only_page) {
    // We're showing the exhibit so boot it up!
    $datapressHead->print_exhibit_library_links();
    $datapressHead->print_exhibit_specific_links($exhibit);
    $datapressHead->print_exhibit_specific_datasources($exhibit);
    $datapressHead->print_exhibit_bootup_code();
  } else {
    // We're in a WordPress page.
    if ($exhibit->get('lightbox')) {
      // Show the lightbox preview? If so, just include the libraries
      $datapressHead->print_lightbox_library_links();
      // List the data links instead so others can scrape data sources
      $datapressHead->print_exhibit_specific_datasources($exhibit);
    } else {
      // Show the exhibit directly on the page.
      // Currently a NO-OP for the <HEAD> element, since this will happen
      // inside an IFRAME.
      //
      // TODO(daniel): Possibly include all the exhibit stuff here:
      	$datapressHead->print_exhibit_library_links();
      	$datapressHead->print_exhibit_specific_links($exhibit);
      	$datapressHead->print_exhibit_specific_datasources($exhibit);
	$datapressHead->print_exhibit_bootup_code();
      //
      // TODO(daniel): Make a corresponding change where the exhibit is
      // actually printed to remove the IFRAME tag **for only this case**
    }
  }
} else {
  /*
   * CASE 3: More than one exhibit to show.
   *
   * When there is more than one exhibit to show, every exhibit is either a lightbox
   * preview or embedded in an iframe. So we only need to 1) decide whether to show the
   * lightbox preview links and 2) print out the datasouce links for the benefit of web
   * scrapers.
   */

  $needLightboxLibrary = false;

  // Print out web scraping links.
  foreach ($exhibits_to_show as $exhibit) {
    $datapressHead->print_exhibit_specific_datasources($exhibit);
    if ($exhibit->get('lightbox', true)) {
      $needLightboxLibrary = true;
    }
  }

  // Maybe print the lightbox library
  if ($needLightboxLibrary) {
    $datapressHead->print_lightbox_library_links();
  }
}

?>
<!-- ========~~~~~-------- end DATAPRESS header --------~~~~~========  -->