First commit

.gitignore

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+build

Makefile

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+all:
+	php main.php && kindlegen -verbose -o learn-you-some-erlang.mobi build/book.opf
+clean:
+	rm -rf build

README.md

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+Learn You Some Erlang for Great Good! on Kindle
+===============================================
+These are the sources that I used to generate [Fred Herbert's book][1] in the
+Kindle-supported .mobi format.
+
+
+How to Generate the Book
+------------------------
+1. Make sure you're connected to the Internet. The ebook will be generated using
+the latest content on the website.
+2. Download [KindleGen][2] and make sure the executable is on PATH.
+3. Run:
+
+   `$ make`
+
+4. Load build/learn-you-some-erlang.mobi on your Kindle device or test it with
+the [Kindle Previewer tool][2].
+
+[1]: http://learnyousomeerlang.com/
+[2]: http://www.amazon.com/gp/feature.html?ie=UTF8&docId=1000234621

config.php

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+<?php
+
+define('BUILD_DIR',      __DIR__ . '/build');
+define('EBOOK_TITLE',    'Learn You Some Erlang for Great Good!');
+define('EBOOK_AUTHOR',   'Frederic Trottier-Hebert');
+define('EBOOK_LANGUAGE', 'en-us');

css/main.css

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+#cover { margin-top: 20%; }
+p      { text-indent: 0px; }
+h2     { margin: 1em 0; }
+h3     { margin: 0.8em 0; }
+h4     { margin: 0.7em 0; }
+pre    { margin: 1em 0; }
+.image { text-align: center; margin: 1em 0; }

main.php

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+<?php
+
+require_once __DIR__ . '/config.php';
+
+
+function filter($a, $fn) {
+    return array_filter($a, $fn);
+}
+
+function map($a, $fn) {
+    return array_map($fn, $a);
+}
+
+function escape($html) {
+    return htmlspecialchars($html, ENT_QUOTES, "UTF-8");
+}
+
+function starts($string, $prefix) {
+    return strpos($string, $prefix) === 0;
+}
+
+function contains($string, $needle) {
+    return strpos($string, $needle) !== false;
+}
+
+function renderTemplate($___path, $___data) {
+    extract($___data);
+    ob_start();
+    require $___path;
+    return ob_get_clean();
+}
+
+function hasClass($node, $class) {
+    $classes = str_word_count($node->getAttribute('class'), 1);
+    return in_array($class, $classes);
+}
+
+function remove($node) {
+    $node->parentNode->removeChild($node);
+}
+
+function nodes($dom, $name) {
+    $nodes = array();
+
+    foreach ($dom->getElementsByTagName($name) as $node) {
+        $nodes[] = $node;
+    }
+
+    return $nodes;
+}
+
+function centerImage($img) {
+    $clone = $img->cloneNode(true);
+    $div = new DOMElement('div');
+    $img->parentNode->replaceChild($div, $img);
+    $div->setAttribute('class', 'image');
+    $div->appendChild($clone);
+}
+
+function download($what, $where) {
+    if (is_file($where)) return;
+
+    echo "Downloading: $what... ";
+
+    $data = file_get_contents($what);
+
+    if ($data) {
+        file_put_contents($where, $data);
+        echo "OK\n";
+    } else {
+        echo "ERROR\n";
+    }
+}
+
+function processImages($page) {
+    foreach (nodes($page, 'img') as $img) {
+        if (! hasClass($img, 'explanation')) {
+            remove($img);
+            continue;
+        }
+
+        $imageSrc = $img->getAttribute('src');
+        $imgName = pathinfo(parse_url($imageSrc, PHP_URL_PATH), PATHINFO_BASENAME);
+
+        download($imageSrc, BUILD_DIR . '/images/'.$imgName);
+
+        $imageSrc = str_replace('http://learnyousomeerlang.com/static/img', '../images', $imageSrc);
+        $img->setAttribute('src', $imageSrc);
+
+        centerImage($img);
+    }
+}
+
+function removeHyperlink($link) {
+    $nodes = $link->childNodes;
+    $parent = $link->parentNode;
+    $parent->removeChild($link);
+
+    foreach ($nodes as $node) {
+        $parent->appendChild($node);
+    }
+}
+
+function removeNoscript($dom2) {
+    foreach (nodes($dom2, 'div') as $div) {
+        if (hasClass($div, 'noscript')) {
+            $div->parentNode->removeChild($div);
+        }
+    }
+}
+
+function removeNavigation($dom2) {
+    foreach (nodes($dom2, 'ul') as $ul) {
+        if (hasClass($ul, 'navigation')) {
+            $ul->parentNode->removeChild($ul);
+        }
+    }
+}
+
+function prepareHref($link) {
+    $href = $link->getAttribute('href');
+    $href = str_replace('http://learnyousomeerlang.com/', '', $href);
+
+    if (contains($href, '#')) {
+        if (!starts($href, '#')) {
+            $href = str_replace('#', '.html#', $href);
+        }
+    } else {
+        $href = $href . '.html';
+    }
+
+    $link->setAttribute('href', $href);
+}
+
+function processLinks($dom2) {
+    foreach (nodes($dom2, 'a') as $link) {
+        if (!$link->hasAttribute('href')) {
+            continue;
+        }
+
+        if (!hasClass($link, 'chapter') && !hasClass($link, 'section')) {
+            removeHyperlink($link);
+        }
+
+        if (hasClass($link, 'chapter')) {
+            prepareHref($link);
+        }
+    }
+}
+
+function changeLayout($pageHtml) {
+    $original = new DOMDocument;
+    $modified = new DOMDocument;
+
+    $original->loadHTML($pageHtml);
+    $content = $original->getElementById('content');
+
+    $modified->loadHTML(renderTemplate(__DIR__ . '/templates/page-layout.html', array(
+        'title' => EBOOK_TITLE,
+    )));
+
+    $content = $modified->importNode($content, true);
+    $modified->getElementsByTagName('body')->item(0)->appendChild($content);
+
+    return $modified;
+}
+
+function removeComingSoon($dom) {
+    foreach (nodes($dom, '*') as $node) {
+        if (hasClass($node, 'coming_soon')) {
+            $node->parentNode->removeChild($node);
+        }
+    }
+}
+
+function processPage($pageHtml) {
+    $pageDom = changeLayout($pageHtml);
+
+    processImages($pageDom);
+    processLinks($pageDom);
+    removeNoscript($pageDom);
+    removeNavigation($pageDom);
+    removeComingSoon($pageDom);
+
+    return $pageDom->saveHTML();
+}
+
+function extractSections($h3) {
+    $node = $h3->nextSibling;
+    while (strtolower($node->nodeName) !== 'ul') {
+        $node = $node->nextSibling;
+    }
+
+    $lis = nodes($node, 'li');
+
+    $sections = array();
+    foreach ($lis as $li) {
+        $href = $li->getElementsByTagName('a')->item(0)->getAttribute('href');
+        $fragment = parse_url($href, PHP_URL_FRAGMENT);
+
+        $sections[] = (object) array(
+            'name' => $li->textContent,
+            'url'  => "#$fragment",
+        );
+    }
+    return $sections;
+}
+
+function extractPages($url) {
+    $dom = new DOMDocument;
+    $dom->loadHTMLFile($url);
+
+    download($url, BUILD_DIR . '/downloaded-pages/toc.html');
+
+    $h3s = nodes($dom, 'h3');
+
+    foreach ($h3s as $h3) {
+        $links = $h3->getElementsByTagName('a');
+
+        if ($links->length) {
+            $pages[] = (object) array(
+                'name'     => $h3->textContent,
+                'url'      => $links->item(0)->getAttribute('href'),
+                'sections' => extractSections($h3),
+            );
+        }
+    }
+
+    return $pages;
+}
+
+function downloadPages($pages) {
+    map($pages, function ($page) {
+        $urlPath = parse_url($page->url, PHP_URL_PATH);
+        $fileName = BUILD_DIR . "/downloaded-pages/$urlPath.html";
+
+        download($page->url, $fileName);
+    });
+}
+
+function createBuildDirs() {
+    $dirs = array(
+        BUILD_DIR . '/css',
+        BUILD_DIR . '/pages',
+        BUILD_DIR . '/images',
+        BUILD_DIR . '/downloaded-pages',
+    );
+
+    foreach ($dirs as $dir) {
+        if (! is_dir($dir)) {
+            mkdir($dir, 0755, true);
+        }
+    }
+}
+
+function processPages() {
+    $files = scandir(BUILD_DIR . '/downloaded-pages');
+    $pages = filter($files, function ($file) {
+        return $file !== '.' && $file !== '..';
+    });
+
+    foreach ($pages as $page) {
+        echo "Processing page: $page...\n";
+        $html = file_get_contents(BUILD_DIR . '/downloaded-pages/' . $page);
+        $processed = processPage($html);
+        file_put_contents(BUILD_DIR . '/pages/' . $page, $processed);
+    }
+}
+
+function buildTocNcx($pages) {
+    $data = array(
+        'title'     => EBOOK_TITLE,
+        'author'    => EBOOK_AUTHOR,
+        'navPoints' => map($pages, function ($page) {
+            $fileName = pathinfo($page->url, PATHINFO_FILENAME);
+
+            return (object) array(
+                'id'    => $fileName,
+                'label' => $page->name,
+                'src'   => "pages/$fileName.html",
+            );
+        }),
+    );
+
+    $ncx = renderTemplate(__DIR__ . '/templates/toc.ncx', $data);
+    file_put_contents(BUILD_DIR . '/toc.ncx', $ncx);
+    return $ncx;
+}
+
+function buildOpf($pages) {
+    $data = array(
+        'title'    => EBOOK_TITLE,
+        'author'   => EBOOK_AUTHOR,
+        'language' => EBOOK_LANGUAGE,
+        'items'    => map($pages, function ($page) {
+            $fileName = pathinfo($page->url, PATHINFO_FILENAME);
+
+            return (object) array(
+                'id'        => $fileName,
+                'mediaType' => 'application/xhtml+xml',
+                'href'      => "pages/$fileName.html",
+            );
+        }),
+    );
+
+    $opf = renderTemplate(__DIR__ . '/templates/book.opf', $data);
+    file_put_contents(BUILD_DIR . '/book.opf', $opf);
+    return $opf;
+}
+
+function copyStaticFiles() {
+    copy(__DIR__ . '/css/main.css', BUILD_DIR . '/css/main.css');
+    copy(__DIR__ . '/images/cover.jpg', BUILD_DIR . '/images/cover.jpg');
+    copy(__DIR__ . '/images/cc.png', BUILD_DIR . '/images/cc.png');
+    copy(__DIR__ . '/templates/preamble.html', BUILD_DIR . '/pages/preamble.html');
+    copy(__DIR__ . '/templates/license.html', BUILD_DIR . '/pages/license.html');
+}
+
+function addOwnPages($pages) {
+    $frontPages = array(
+        (object) array( 'url' => 'preamble' ),
+        (object) array( 'url' => 'license'  ),
+        (object) array( 'url' => 'toc'      ),
+    );
+
+    $pages = array_merge($frontPages, $pages);
+
+    return $pages;
+}
+
+function main() {
+    createBuildDirs();
+
+    $pages = extractPages('http://learnyousomeerlang.com/content');
+
+    downloadPages($pages);
+    buildTocNcx($pages);
+
+    $pages = addOwnPages($pages);
+    buildOpf($pages);
+
+    processPages();
+    copyStaticFiles();
+}
+
+main();