Print file and line number for anonymous functions

lib/index.js

@@ -22,6 +22,14 @@ module.exports = (expressApp, filename) => {
         return indentation.replace(/─/g, ' ').replace(/├/g, '│').replace(/└/g, ' ')
     }
 
+    function getFileLine(handler) {
+        try {
+            handler()
+        } catch(e) {
+            return e.stack.split('\n')[1].split('at')[1].trim()
+        }
+    }
+
     function printRoutes(layer, indentation) {
 
         let path = ' '
@@ -51,7 +59,12 @@ module.exports = (expressApp, filename) => {
         }
         methods = methods.join(', ').toUpperCase()
 
-        text.push(`${ fillWithSpaces(indentation + layer.name, COLUMN_WIDTH_TREE) }${ fillWithSpaces(path, COLUMN_WIDTH_PATH) } ${ methods }`)
+        let name = layer.name
+        if(name == "<anonymous>") {
+            let file = getFileLine(layer.handle)
+            name = file.replace(process.cwd(), ".")
+        }
+        text.push(`${ fillWithSpaces(indentation + name, COLUMN_WIDTH_TREE) }${ fillWithSpaces(path, COLUMN_WIDTH_PATH) } ${ methods }`)
 
         if (!layer.stack && !(layer.route && layer.route.stack)) {
             if (layer.handle.stack) {

test/fixtures/anonymous.expected.txt

@@ -0,0 +1,12 @@
+router                                                                                                         
+ ├── query                                         *                                                           
+ ├── expressInit                                   *                                                           
+ ├── bound dispatch                                /users/:id                                                  GET
+ │    └── app.get (./test/spec/main.js:137:49)     /                                                           GET
+ │   
+ ├── bound dispatch                                /posts/:id                                                  GET
+ │    └── ./test/spec/main.js:139:55               /                                                           GET
+ │   
+ └── bound dispatch                                /images/:id                                                 GET
+      └── __images                                 /                                                           GET
+

test/spec/main.js

@@ -130,4 +130,29 @@ describe('The express-print-routes middleware', () => {
 
     })
 
+    it('should print anonymous functions', (done) => {
+
+        let app = express()
+
+        app.get('/users/:id', (req,res) => { res.status(200); res.end() })
+        // eslint-disable-next-line prefer-arrow-callback
+        app.get('/posts/:id', function (req,res) { res.status(200); res.end() })
+        app.get('/images/:id', function __images(req,res) { res.status(200); res.end() })
+
+        printRoutes(app, path.join(__dirname, '../results/anonymous.generated.txt'))
+
+        setTimeout(() => {
+
+            let expected = fs.readFileSync(path.join(__dirname, '../fixtures/anonymous.expected.txt'), 'utf8')
+            let generated = fs.readFileSync(path.join(__dirname, '../results/anonymous.generated.txt'), 'utf8')
+
+            expect(generated).to.eql(expected)
+
+            done()
+
+        }, 100)
+
+    })
+
+
 })