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var _ = require('lodash');
var util = require('util');
var juice = require('juice');
var command = require('../utils/command');
var fs = require('../utils/fs');
var Promise = require('../utils/promise');
var error = require('../utils/error');
var WebsiteOutput = require('./website');
var assetsInliner = require('./assets-inliner');
function _EbookOutput() {
WebsiteOutput.apply(this, arguments);
// ebook-convert does not support link like "./"
this.opts.directoryIndex = false;
}
util.inherits(_EbookOutput, WebsiteOutput);
var EbookOutput = assetsInliner(_EbookOutput);
EbookOutput.prototype.name = 'ebook';
// Return context for templating
// Incldue type of ebbook generated
EbookOutput.prototype.getSelfContext = function() {
var ctx = EbookOutput.super_.prototype.getSelfContext.apply(this);
ctx.format = this.opts.format;
return ctx;
};
// Finish generation, create ebook using ebook-convert
EbookOutput.prototype.finish = function() {
var that = this;
if (that.book.isMultilingual()) {
return EbookOutput.super_.prototype.finish.apply(that);
}
return Promise()
.then(function() {
return EbookOutput.super_.prototype.finish.apply(that);
})
// Generate SUMMARY.html
.then(function() {
return that.render('summary', 'SUMMARY.html', that.getContext());
})
// Start ebook-convert
.then(function() {
return that.ebookConvertOption();
})
.then(function(options) {
if (!that.opts.format) return;
var cmd = [
'ebook-convert',
that.resolve('SUMMARY.html'),
that.resolve('index.'+that.opts.format),
command.optionsToShellArgs(options)
].join(' ');
return command.exec(cmd)
.progress(function(data) {
that.book.log.debug(data);
})
.fail(function(err) {
if (err.code == 127) {
throw error.RequireInstallError({
cmd: 'ebook-convert',
install: 'Install it from Calibre: https://calibre-ebook.com'
});
}
throw error.EbookError(err);
});
});
};
// Generate header/footer for PDF
EbookOutput.prototype.getPDFTemplate = function(tpl) {
var that = this;
var context = _.extend(
{
// Nunjucks context mapping to ebook-convert templating
page: {
num: '_PAGENUM_',
title: '_TITLE_',
section: '_SECTION_'
}
},
this.getContext()
);
return this.renderAsString('pdf_'+tpl, context)
// Inline css, include css relative to the output folder
.then(function(output) {
return Promise.nfcall(juice.juiceResources, output, {
webResources: {
relativeTo: that.root()
}
});
});
};
// Locate the cover file to use
// Use configuration or search a "cover.jpg" file
// For multi-lingual book, it can use the one from the main book
EbookOutput.prototype.locateCover = function() {
var cover = this.book.config.get('cover', 'cover.jpg');
// Resolve to absolute
cover = this.resolve(cover);
// Cover doesn't exist and multilingual?
if (!fs.existsSync(cover)) {
if (this.parent) return this.parent.locateCover();
else return undefined;
}
return cover;
};
// Generate options for ebook-convert
EbookOutput.prototype.ebookConvertOption = function() {
var that = this;
var options = {
'--cover': this.locateCover(),
'--title': that.book.config.get('title'),
'--comments': that.book.config.get('description'),
'--isbn': that.book.config.get('isbn'),
'--authors': that.book.config.get('author'),
'--language': that.book.config.get('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.opts.format == 'epub') {
options = _.extend(options, {
'--dont-split-on-page-breaks': true
});
}
if (that.opts.format != 'pdf') return Promise(options);
var pdfOptions = that.book.config.get('pdf');
options = _.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'),
'--pdf-sans-family': String(pdfOptions.fontFamily)
});
return that.getPDFTemplate('header')
.then(function(tpl) {
options['--pdf-header-template'] = tpl;
return that.getPDFTemplate('footer');
})
.then(function(tpl) {
options['--pdf-footer-template'] = tpl;
return options;
});
};
// Don't write multi-lingual index for wbook
EbookOutput.prototype.outputMultilingualIndex = function() {
};
module.exports = EbookOutput;
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