1 files changed, 71 insertions, 45 deletions
diff --git a/lib/generate/index.js b/lib/generate/index.js
index 38e7503..b46c96b 100644
--- a/lib/generate/index.js
+++ b/lib/generate/index.js
@@ -2,6 +2,7 @@ var Q = require("q");
 var _ = require("lodash");
 
 var path = require("path");
+var swig = require('swig');
 
 var fs = require("./fs");
 var parse = require("../parse");
@@ -54,60 +55,85 @@ var generate = function(options) {
 
     // List all files in the repository
     .then(function() {
-        return fs.list(options.input);
+        return fs.list(options.input)
+        .then(function(_files) {
+            files = _files;
+        })
     })
 
-    // Check repository is valid
-    .then(function(_files) {
-        files = _files;
-
-        if (!_.contains(files, "SUMMARY.md") || !_.contains(files, "README.md")) {
+    // Detect multi-languages book
+    .then(function() {
+        if (_.contains(files, "README.md") && _.contains(files, "LANGS.md")) {
+            // Multi-languages book
+            return fs.readFile(path.join(options.input, "LANGS.md"), "utf-8")
+
+            // Generate sub-books
+            .then(function(_langsSummary) {
+                options.langsSummary = parse.summary(_langsSummary);
+                
+                // Generated a book for each valid entry
+                return Q.all(
+                    _.chain(langsSummary.chapters)
+                    .filter(function(entry) {
+                        return entry.path != null;
+                    })
+                    .map(function(entry) {
+                        return generate(_.extend({}, options, {
+                            input: path.join(options.input, entry.path),
+                            output: path.join(options.output, entry.path)
+                        }));
+                    })
+                    .value()
+                );
+            });
+        } else if (!_.contains(files, "SUMMARY.md") || !_.contains(files, "README.md")) {
+            // Invalid book
             return Q.reject(new Error("Invalid gitbook repository, need SUMMARY.md and README.md"));
-        }
-    })
+        } else {
+            // Generate the book
+            return fs.readFile(path.join(options.input, "SUMMARY.md"), "utf-8")
 
-    // Get summary
-    .then(function() {
-        return fs.readFile(path.join(options.input, "SUMMARY.md"), "utf-8")
-        .then(function(_summary) {
-            options.summary = parse.summary(_summary);
+            // Get summary
+            .then(function(_summary) {
+                options.summary = parse.summary(_summary);
 
-            // Parse navigation
-            options.navigation = parse.navigation(options.summary);
-        });
-    })
+                // Parse navigation
+                options.navigation = parse.navigation(options.summary);
+            })
 
-    // Create the generator
-    .then(function() {
-        generator = new generators[options.generator](options);
-    })
+            // Create the generator
+            .then(function() {
+                generator = new generators[options.generator](options);
+            })
 
-    // Copy file and replace markdown file
-    .then(function() {
-        return Q.all(
-            _.chain(files)
-            .map(function(file) {
-                if (!file) return;
-
-                if (file[file.length -1] == "/") {
-                    return Q(generator.transferFolder(file));
-                } else if (path.extname(file) == ".md" && options.navigation[file] != null) {
-                    return fs.readFile(path.join(options.input, file), "utf-8")
-                    .then(function(content) {
-                        return Q(generator.convertFile(content, file));
-                    });
-                } else {
-                    return Q(generator.transferFile(file));
-                }
+            // Copy file and replace markdown file
+            .then(function() {
+                return Q.all(
+                    _.chain(files)
+                    .map(function(file) {
+                        if (!file) return;
+
+                        if (file[file.length -1] == "/") {
+                            return Q(generator.transferFolder(file));
+                        } else if (path.extname(file) == ".md" && options.navigation[file] != null) {
+                            return fs.readFile(path.join(options.input, file), "utf-8")
+                            .then(function(content) {
+                                return Q(generator.convertFile(content, file));
+                            });
+                        } else {
+                            return Q(generator.transferFile(file));
+                        }
+                    })
+                    .value()
+                );
             })
-            .value()
-        );
-    })
 
-    // Finish gneration
-    .then(function() {
-        return generator.finish();
-    });
+            // Finish gneration
+            .then(function() {
+                return generator.finish();
+            });
+        }
+    })
 };
 
 module.exports = {