creationix · December 30, 2015 07:29 · Dec 4, 2013 · Dec 4, 2013 · Dec 4, 2013 · Dec 4, 2013
diff --git a/output.md b/output.md
@@ -1,6 +1,8 @@
 ```sh
 $> node tree.js ./app.js | dot -Tsvg > events.svg && xdg-open events.svg
+```
 
+```sh
 $> curl http://localhost:8080/app.js
 ... LOTS OF JS CODE ...
 $> curl http://localhost:8080/favicon.ico

diff --git a/output.md b/output.md
@@ -1,3 +1,10 @@
-    $> node tree.js ./app.js | dot -Tsvg > events.svg && xdg-open events.svg
+```sh
+$> node tree.js ./app.js | dot -Tsvg > events.svg && xdg-open events.svg
+
+$> curl http://localhost:8080/app.js
+... LOTS OF JS CODE ...
+$> curl http://localhost:8080/favicon.ico
+Not Found
+```
 
 ![events](http://creationix.com/events2.svg)
diff --git a/app.js b/app.js
@@ -1,13 +1,14 @@
 var http = require('http');
-var fs = require('fs');
+var send = require('send');
+var urlParse = require('url').parse;
+
+var count = 2;
 var server = http.createServer(function (req, res) {
-  var stream = fs.createReadStream(__filename);
-  stream.pipe(res);
-  res.setHeader("Content-Type", "application/javascript");
-  stream.once('end', function () {
-    server.close();
-  });
+  if (!--count) server.close(); // Only allow two connection and then exit.
+  send(req, urlParse(req.url).pathname)
+    .root(__dirname)
+    .pipe(res);
 });
 server.listen(8080, function () {
   console.error("Server listening at http://localhost:8080/");
-});
+});
diff --git a/output.md b/output.md
@@ -1,3 +1,3 @@
     $> node tree.js ./app.js | dot -Tsvg > events.svg && xdg-open events.svg
 
-![events](http://creationix.com/events.svg)
+![events](http://creationix.com/events2.svg)
diff --git a/output.md b/output.md
@@ -1,3 +1,3 @@
-    $> node tree ./app.js > dot -Tsvg | preview
+    $> node tree.js ./app.js | dot -Tsvg > events.svg && xdg-open events.svg
 
 ![events](http://creationix.com/events.svg)
diff --git a/output.md b/output.md
@@ -1,3 +1,3 @@
-$> node tree ./app.js > dot -Tsvg | preview
+    $> node tree ./app.js > dot -Tsvg | preview
 
 ![events](http://creationix.com/events.svg)
diff --git a/output.md b/output.md
@@ -1 +1,3 @@
+$> node tree ./app.js > dot -Tsvg | preview
+
 ![events](http://creationix.com/events.svg)
diff --git a/output.md b/output.md
@@ -1 +1 @@
-![http://creationix.com/events.svg][]
+![events](http://creationix.com/events.svg)
diff --git a/output.md b/output.md
@@ -1 +1 @@
-![http://creationix.com/events.svg]()
+![http://creationix.com/events.svg][]
diff --git a/output.md b/output.md
@@ -1 +1 @@
-!<http://creationix.com/events.svg>()
+![http://creationix.com/events.svg]()
diff --git a/app.js b/app.js
@@ -0,0 +1,13 @@
+var http = require('http');
+var fs = require('fs');
+var server = http.createServer(function (req, res) {
+  var stream = fs.createReadStream(__filename);
+  stream.pipe(res);
+  res.setHeader("Content-Type", "application/javascript");
+  stream.once('end', function () {
+    server.close();
+  });
+});
+server.listen(8080, function () {
+  console.error("Server listening at http://localhost:8080/");
+});
diff --git a/output.md b/output.md
@@ -0,0 +1 @@
+!<http://creationix.com/events.svg>()
diff --git a/tree.js b/tree.js
@@ -0,0 +1,97 @@
+// polyfill process.addAsyncListener for older nodes.
+if (!process.addAsyncListener) require('async-listener');
+
+process.addAsyncListener(setup, {
+  before: onBefore,
+  after: onAfter,
+  error: onError
+});
+
+var current = null;
+var stack = [];
+var leaves = [];
+var nextId = 1;
+
+function guessName() {
+  var stack = (new Error()).stack.split("\n");
+  var seen = false;
+  var line;
+  for (var i = 1; i < stack.length; i++) {
+    line = stack[i];
+    var isLib = /node_modules\/async-listener/.test(line);
+    if (!seen) {
+      if (isLib) seen = true;
+      continue;
+    }
+    if (isLib) continue;
+    break;
+  }
+  var match = line.match(/at ([^ ]*).*\(([^)]*)\)/);
+  return {
+    name: match && match[1],
+    file: match && match[2]
+  };
+}
+
+function setup() {
+  var info = guessName();
+  info.parent = current;
+  info.parentIndex = current ? current.children.length - 1 : 0;
+  info.setup = Date.now();
+  info.id = nextId++;
+  info.children = [];
+  if (current) {
+    var index = leaves.indexOf(current);
+    if (index >= 0) leaves.splice(index, 1);
+  }
+  leaves.push(info);
+  return info;
+}
+
+function onBefore(context, storage) {
+  if (current) stack.push(current);
+  storage.children.push({ before: Date.now() });
+  current = storage;
+}
+
+function onAfter(context, storage) {
+  storage.children[storage.children.length - 1].after = Date.now();
+  current = stack.pop();
+}
+
+function onError(storage, error) {
+  if (!storage) return false;
+  storage.error = error;
+  return true;
+}
+
+process.on('exit', function () {
+  var inspect = require('util').inspect;
+  var nodes = leaves;
+  leaves = [];
+  var seen = [];
+  console.error(inspect(nodes, {colors:true,depth:100}));
+  console.log('digraph events {');
+  console.log('graph [rankdir = "LR"];');
+
+  nodes.forEach(function (node) {
+    while (node) {
+      if (seen.indexOf(node) >= 0) return;
+      seen.push(node);
+      var ch = node.children.map(function (child, i) {
+        return '<c' + i + '>' + (child.before - node.setup) + 'ms - ' + (child.after - child.before) + 'ms';
+      }).join("|");
+      console.log('n' + node.id + ' [ shape=record label="<name>' + ("" + node.name).replace('<', "(").replace(">", ")") + '|' + node.file + '|' + ch + '" ];');
+      var parent = node.parent;
+      if (parent) {
+        console.log('n' + parent.id + ':c' + node.parentIndex + ' -> n' + node.id + ':name');
+      }
+      node = parent;
+    }
+  });
+
+  console.log('}');
+});
+
+
+require(process.argv[2]);
Original file line number	Diff line number	Diff line change
		@@ -1 +1,3 @@
		$> node tree ./app.js > dot -Tsvg \| preview

		![events](http://creationix.com/events.svg)
Original file line number	Diff line number	Diff line change
		@@ -1 +1 @@
		![http://creationix.com/events.svg][]
		![events](http://creationix.com/events.svg)
Original file line number	Diff line number	Diff line change
		@@ -1 +1 @@
		![http://creationix.com/events.svg]()
		![http://creationix.com/events.svg][]
Original file line number	Diff line number	Diff line change
		@@ -1 +1 @@
		!<http://creationix.com/events.svg>()
		![http://creationix.com/events.svg]()