Add cli command serve

This does a build, then spins up a HTTP server to serve the books
contents

bin/gitbook.js

@@ -20,18 +20,20 @@ prog
 .option('-d, --dir <source_directory>', 'Source directory of book, containing Markdown files');
 
 
+var buildFunc;
 prog
 .command('build [source_dir]')
 .description('Build a gitbook from a directory')
 .option('-o, --output <directory>', 'Path to output directory, defaults to ./_book')
 .option('-t, --title <name>', 'Name of the book to generate, defaults to repo name')
 .option('-g, --github <repo_path>', 'ID of github repo like : username/repo')
-.action(function(dir, options) {
+.action(buildFunc = function(dir, options) {
     dir = dir || process.cwd();
     outputDir = options.output || path.join(dir, '_book');
 
+    console.log('Starting build ...');
     // Get repo's URL
-    utils.gitURL(dir)
+    return utils.gitURL(dir)
     .then(function(url) {
         // Get ID of repo
         return utils.githubID(url);
@@ -50,9 +52,35 @@ prog
         );
     })
     .then(function(output) {
-        console.log("Done!");
+        console.log("Successfuly built !");
     }, function(err) {
         console.log(err.stack || err);
+        throw err;
+    })
+    .then(_.constant(outputDir));
+});
+
+prog
+.command('serve [source_dir]')
+.description('Build then serve a gitbook from a directory')
+.option('-p, --port <port>', 'Port for server to listen on', 4000)
+.option('-o, --output <directory>', 'Path to output directory, defaults to ./_book')
+.option('-t, --title <name>', 'Name of the book to generate, defaults to repo name')
+.option('-g, --github <repo_path>', 'ID of github repo like : username/repo')
+.action(function(dir, options) {
+    buildFunc(dir, options)
+    .then(function(outputDir) {
+        console.log();
+        console.log('Starting server ...');
+        return utils.serveDir(outputDir, options.port);
+    })
+    .then(function() {
+        console.log('Serving book on http://localhost:'+options.port);
+        console.log();
+        console.log('Press CTRL+C to quit ...');
+    })
+    .fail(function(err) {
+        console.error(err);
     });
 });
 

bin/utils.js

@@ -1,6 +1,9 @@
 var Q = require('q');
 var _ = require('lodash');
 
+var http = require('http');
+var send = require('send');
+
 var url = require('url');
 var cp = require('child_process');
 
@@ -49,10 +52,41 @@ function titleCase(str)
     return str.replace(/\w\S*/g, function(txt){return txt.charAt(0).toUpperCase() + txt.substr(1).toLowerCase();});
 }
 
+function serveDir(dir, port) {
+    var d = Q.defer();
+
+    var server = http.createServer(function(req, res){
+        // Render error
+        function error(err) {
+            res.statusCode = err.status || 500;
+            res.end(err.message);
+        }
+
+        // Redirect to directory's index.html
+        function redirect() {
+            res.statusCode = 301;
+            res.setHeader('Location', req.url + '/');
+            res.end('Redirecting to ' + req.url + '/');
+        }
+
+        // Send file
+        send(req, url.parse(req.url).pathname)
+        .root(dir)
+        .on('error', error)
+        .on('directory', redirect)
+        .pipe(res);
+    }).listen(port);
+
+    d.resolve(server);
+
+    return d.promise;
+}
+
 
 // Exports
 module.exports = {
     gitURL: gitURL,
     githubID: githubID,
     titleCase: titleCase,
+    serveDir: serveDir,
 };

package.json

@@ -8,6 +8,7 @@
         "lodash": "2.4.1",
         "marked": "0.3.2",
         "swig": "1.3.2",
+        "send": "0.2.0",
         "fstream-ignore": "0.0.7",
         "commander": "2.2.0",
         "fs-extra": "0.8.1"