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var util = require("util");
var path = require("path");
var Q = require("q");
var _ = require("lodash");
var juice = require("juice");
var exec = require("child_process").exec;
var fs = require("../utils/fs");
var stringUtils = require("../utils/string");
var BaseGenerator = require("./website");
var Generator = function(book, format) {
BaseGenerator.apply(this, arguments);
// eBook format
this.ebookFormat = format;
// Resources namespace
this.namespace = "ebook";
// Styles to use
this.styles = _.compact(["print", "ebook", this.ebookFormat]);
// Convert images (svg -> png)
this.convertImages = true;
};
util.inherits(Generator, BaseGenerator);
Generator.prototype.prepareTemplates = function() {
this.templates.page = this.book.plugins.template("ebook:page") || path.resolve(this.options.theme, "templates/ebook/page.html");
this.templates.summary = this.book.plugins.template("ebook:summary") || path.resolve(this.options.theme, "templates/ebook/summary.html");
this.templates.glossary = this.book.plugins.template("ebook:glossary") || path.resolve(this.options.theme, "templates/ebook/glossary.html");
return Q();
};
// Generate table of contents
Generator.prototype.writeSummary = function() {
var that = this;
that.book.log.info.ln("write SUMMARY.html");
return this._writeTemplate(this.templates.summary, {}, path.join(this.options.output, "SUMMARY.html"));
};
// Return template for footer/header with inlined css
Generator.prototype.getPDFTemplate = function(id) {
var tpl = this.options.pdf[id+'Template'];
var defaultTpl = path.resolve(this.options.theme, 'templates/ebook/'+id+'.html');
var defaultCSS = path.resolve(this.options.theme, 'assets/print.css');
// Default template from theme
if (!tpl && fs.existsSync(defaultTpl)) {
tpl = fs.readFileSync(defaultTpl, { encoding: 'utf-8' });
}
// Inline CSS using juice
var stylesheets = [];
// From theme
if (fs.existsSync(defaultCSS)) {
stylesheets.push(fs.readFileSync(defaultCSS, { encoding: 'utf-8' }));
}
// Custom PDF style
if (this.styles.pdf) {
stylesheets.push(fs.readFileSync(this.book.resolve(this.styles.pdf), { encoding: 'utf-8' }));
}
tpl = juice(tpl, {
extraCss: stylesheets.concat('/n')
});
return tpl;
};
Generator.prototype.finish = function() {
var that = this;
return Q()
.then(this.copyAssets)
.then(this.copyCover)
.then(this.writeGlossary)
.then(this.writeSummary)
.then(function() {
if (!that.ebookFormat) return Q();
if (!that.options.cover && fs.existsSync(path.join(that.options.output, "cover.jpg"))) {
that.options.cover = path.join(that.options.output, "cover.jpg");
}
var d = Q.defer();
var _options = {
"--cover": that.options.cover,
"--title": that.options.title,
"--comments": that.options.description,
"--isbn": that.options.isbn,
"--authors": that.options.author,
"--language": that.options.language,
"--book-producer": "GitBook",
"--publisher": "GitBook",
"--chapter": "descendant-or-self::*[contains(concat(' ', normalize-space(@class), ' '), ' book-chapter ')]",
"--level1-toc": "descendant-or-self::*[contains(concat(' ', normalize-space(@class), ' '), ' book-chapter-1 ')]",
"--level2-toc": "descendant-or-self::*[contains(concat(' ', normalize-space(@class), ' '), ' book-chapter-2 ')]",
"--level3-toc": "descendant-or-self::*[contains(concat(' ', normalize-space(@class), ' '), ' book-chapter-3 ')]",
"--no-chapters-in-toc": true,
"--max-levels": "1",
"--breadth-first": true
};
if (that.ebookFormat == "pdf") {
var pdfOptions = that.options.pdf;
_.extend(_options, {
"--chapter-mark": String(pdfOptions.chapterMark),
"--page-breaks-before": String(pdfOptions.pageBreaksBefore),
"--margin-left": String(pdfOptions.margin.left),
"--margin-right": String(pdfOptions.margin.right),
"--margin-top": String(pdfOptions.margin.top),
"--margin-bottom": String(pdfOptions.margin.bottom),
"--pdf-default-font-size": String(pdfOptions.fontSize),
"--pdf-mono-font-size": String(pdfOptions.fontSize),
"--paper-size": String(pdfOptions.paperSize),
"--pdf-page-numbers": Boolean(pdfOptions.pageNumbers),
"--pdf-header-template": that.getPDFTemplate('header'),
"--pdf-footer-template": that.getPDFTemplate('footer')
});
} else if (that.ebookFormat == "epub") {
_.extend(_options, {
"--dont-split-on-page-breaks": true
});
}
var command = [
"ebook-convert",
path.join(that.options.output, "SUMMARY.html"),
path.join(that.options.output, "index."+that.ebookFormat),
stringUtils.optionsToShellArgs(_options)
].join(" ");
that.book.log.info("start conversion to", that.ebookFormat, "....");
var child = exec(command, function (error, stdout) {
if (error) {
that.book.log.info.fail();
if (error.code == 127) {
error.message = "Need to install ebook-convert from Calibre";
} else {
error.message = error.message + " "+stdout;
}
return d.reject(error);
}
that.book.log.info.ok();
d.resolve();
});
child.stdout.on("data", function (data) {
that.book.log.debug(data);
});
child.stderr.on("data", function (data) {
that.book.log.debug(data);
});
return d.promise;
});
};
module.exports = Generator;
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