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Add chapter navigation footer

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Brandon 2022-11-04 23:13:53 -07:00 • committed by Alex Cabal
parent f87f6290a4
commit 04cf6bce03
3 changed files with 73 additions and 1 deletions
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43
scripts/inject-chapter-navigation-footer Executable file
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#!/usr/bin/php
<?
if(count($argv) < 3){
print 'Expected usage: inject-chapter-navigation-footer <epubDirectory> <bookUrl>';
exit(1);
}
$epubDirectory = $argv[1];
$bookUrl = $argv[2];
// Parse the order of chapters from the table of contents.
$doc = new DOMDocument();
libxml_use_internal_errors(true); // Suppress warnings from output.
$doc->loadHTMLFile($epubDirectory . '/toc.xhtml');
libxml_clear_errors();
$toc = $doc->getElementById('toc');
if($toc){
$chapterLinks = array();
foreach($toc->getElementsByTagName('a') as $link){
$obj = new stdClass();
$obj->Path = $link->getAttribute('href');
$obj->Name = $link->textContent;
// Only include links pointing to actual files (e.g. skip href="text/chapter-7#panawes-story").
if(file_exists($epubDirectory . '/' . $obj->Path . '.xhtml')){
$chapterLinks[] = $obj;
}
}
for($i = 0; $i < count($chapterLinks); $i++){
$previousObj = $i > 0 ? $chapterLinks[$i - 1] : null;
$nextObj = $i < count($chapterLinks) - 1 ? $chapterLinks[$i + 1] : null;
$fileName = $epubDirectory . '/' . $chapterLinks[$i]->Path . '.xhtml';
$chapter = file_get_contents($fileName);
// Inject the navigation footer.
$previousLink = $previousObj ? sprintf('<a href="%s"><em>Previous:</em> %s</a>', $bookUrl . '/' . $previousObj->Path, htmlspecialchars($previousObj->Name)) : '';
$nextLink = $nextObj ? sprintf('<a href="%s"><em>Next:</em> %s</a>', $bookUrl . '/' . $nextObj->Path, htmlspecialchars($nextObj->Name)) : '';
$footer = sprintf('<footer><ul><li>%s</li><li>%s</li></ul></footer>', $previousLink, $nextLink);
$chapter = str_replace('</body>', $footer . '</body>', $chapter);
file_put_contents($fileName, $chapter);
}
}
?>