showdown
Version:
A Markdown to HTML converter written in Javascript
196 lines (178 loc) • 5.71 kB
JavaScript
var yargs = require('yargs'),
fs = require('fs'),
Messenger = require('./messenger.js'),
showdown = require('../../dist/showdown'),
showdownOptions = showdown.getDefaultOptions(false);
yargs.reset()
.usage('Usage: showdown makehtml [options]')
.example('showdown makehtml -i', 'Reads from stdin and outputs to stdout')
.example('showdown makehtml -i foo.md -o bar.html', 'Reads \'foo.md\' and writes to \'bar.html\'')
.example('showdown makehtml -i --flavor="github"', 'Parses stdin using GFM style')
.version()
.alias('v', 'version')
.config('c')
.alias('c', 'config')
.help('h')
.alias('h', 'help')
.option('i', {
alias : 'input',
describe: 'Input source. Usually a md file. If omitted or empty, reads from stdin',
type: 'string'
})
.option('o', {
alias : 'output',
describe: 'Output target. Usually a html file. If omitted or empty, writes to stdout',
type: 'string',
default: false
})
.option('u', {
alias : 'encoding',
describe: 'Input encoding',
type: 'string'
})
.option('a', {
alias : 'append',
describe: 'Append data to output instead of overwriting',
type: 'string',
default: false
})
.option('e', {
alias : 'extensions',
describe: 'Load the specified extensions. Should be valid paths to node compatible extensions',
type: 'array'
})
.option('p', {
alias : 'flavor',
describe: 'Run with a predetermined flavor of options. Default is vanilla',
type: 'string'
})
.option('q', {
alias: 'quiet',
description: 'Quiet mode. Only print errors',
type: 'boolean',
default: false
})
.option('m', {
alias: 'mute',
description: 'Mute mode. Does not print anything',
type: 'boolean',
default: false
});
// load showdown default options
for (var opt in showdownOptions) {
if (showdownOptions.hasOwnProperty(opt)) {
if (showdownOptions[opt].defaultValue === false) {
showdownOptions[opt].default = null;
} else {
showdownOptions[opt].default = showdownOptions[opt].defaultValue;
}
yargs.option(opt, showdownOptions[opt]);
}
}
function run () {
'use strict';
var argv = yargs.argv,
readMode = (!argv.i || argv.i === '') ? 'stdin' : 'file',
writeMode = (!argv.o || argv.o === '') ? 'stdout' : 'file',
msgMode = (writeMode === 'file') ? 'stdout' : 'stderr',
/**
* MSG object
* @type {Messenger}
*/
messenger = new Messenger(msgMode, argv.q, argv.m),
read = (readMode === 'stdin') ? readFromStdIn : readFromFile,
write = (writeMode === 'stdout') ? writeToStdOut : writeToFile,
enc = argv.encoding || 'utf8',
flavor = argv.p,
append = argv.a || false,
options = parseOptions(flavor),
converter = new showdown.Converter(options),
md, html;
// Load extensions
if (argv.e) {
messenger.printMsg('Loading extensions');
for (var i = 0; i < argv.e.length; ++i) {
try {
var ext = require(argv.e[i]);
converter.addExtension(ext, argv.e[i]);
} catch (e) {
messenger.printError('Could not load extension ' + argv.e[i] + '. Reason:');
messenger.errorExit(e);
}
}
}
messenger.printMsg('...');
// read the input
messenger.printMsg('Reading data from ' + readMode + '...');
md = read(enc);
// process the input
messenger.printMsg('Parsing markdown...');
html = converter.makeHtml(md);
// write the output
messenger.printMsg('Writing data to ' + writeMode + '...');
write(html, append);
messenger.okExit();
function parseOptions (flavor) {
var options = {},
flavorOpts = showdown.getFlavorOptions(flavor) || {};
// if flavor is not undefined, let's tell the user we're loading that preset
if (flavor) {
messenger.printMsg('Loading ' + flavor + ' flavor.');
}
for (var opt in argv) {
if (argv.hasOwnProperty(opt)) {
// first we load the default options
if (showdownOptions.hasOwnProperty(opt) && showdownOptions[opt].default !== null) {
options[opt] = showdownOptions[opt].default;
}
// we now override defaults with flavor, if a flavor was indeed passed
if (flavorOpts.hasOwnProperty(opt)) {
options[opt] = flavorOpts[opt];
}
// lastly we override with explicit passed options
// being careful not to pass CLI specific options, such as -v, -h or --extensions
if (showdownOptions.hasOwnProperty(opt)) {
if (argv[opt] === true) {
messenger.printMsg('Enabling option ' + opt);
options[opt] = argv[opt];
} else if (argv[opt] === false) {
options[opt] = argv[opt];
}
}
}
}
return options;
}
function readFromStdIn () {
try {
var size = fs.fstatSync(process.stdin.fd).size;
return size > 0 ? fs.readSync(process.stdin.fd, size)[0] : '';
} catch (e) {
var err = new Error('Could not read from stdin, reason: ' + e.message);
messenger.errorExit(err);
}
}
function readFromFile (encoding) {
try {
return fs.readFileSync(argv.i, encoding);
} catch (err) {
messenger.errorExit(err);
}
}
function writeToStdOut (html) {
return process.stdout.write(html);
}
function writeToFile (html, append) {
// If a flag is passed, it means we should append instead of overwriting.
// Only works with files, obviously
var write = (append) ? fs.appendFileSync : fs.writeFileSync;
try {
write(argv.o, html);
} catch (err) {
messenger.errorExit(err);
}
}
}
module.exports = exports = {
run: run
};