Parse glossary during build

lib/generate/index.js

@@ -232,14 +232,44 @@ var generateBook = function(options) {
                 .then(function() {
                     options.summary = summary.content;
                     options.navigation = parse.navigation(options.summary);
+                });
+        })
+
+        // Read glossary
+        .then(function() {
+            var glossary = {};
+
+            var _callHook = function(name) {
+                return generator.callHook(name, glossary)
+                .then(function(_glossary) {
+                    glossary = _glossary;
+                    return glossary;
+                });
+            };
+
+            return fs.readFile(path.join(options.input, "GLOSSARY.md"), "utf-8")
+                .fail(function() {
+                    return "";
                 })
+                .then(function(_content) {
+                    glossary.content = _content;
+                    return _callHook("glossary:before");
+                })
+                .then(function() {
+                    glossary.content = parse.glossary(glossary.content);
+                    return _callHook("glossary:after");
+                })
+                .then(function() {
+                    options.glossary = glossary.content;
+                });
         })
 
         // Skip processing some files
         .then(function() {
             files = _.filter(files, function (file) {
                 return !(
-                    file === 'SUMMARY.md'
+                    file === 'SUMMARY.md' ||
+                    file === 'GLOSSARY.md'
                 );
             });
         })