Merge pull request #2929 from ian-r-rose/dependency_graph

Dependency graph

docs/dependency-graph.svg

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+<path fill="none" stroke="black" d="M500.59,-34.4237C509.921,-40.3767 520.764,-47.3836 530.476,-53.8882 563.999,-76.3417 601.888,-102.964 627.296,-121.002"/>
+<polygon fill="black" stroke="black" points="625.557,-124.06 635.735,-127.003 629.614,-118.355 625.557,-124.06"/>
+</g>
+<!-- tooltip -->
+<g id="node24" class="node"><title>tooltip</title>
+<g id="a_node24"><a xlink:href="https:/github.com/jupyterlab/jupyterlab/tree/master/packages/tooltip" xlink:title="tooltip">
+<ellipse fill="none" stroke="black" cx="336.531" cy="-171.888" rx="33.5952" ry="18"/>
+<text text-anchor="middle" x="336.531" y="-168.188" font-family="Times,serif" font-size="14.00">tooltip</text>
+</a>
+</g>
+</g>
+<!-- tooltip&#45;&gt;rendermime -->
+<g id="edge26" class="edge"><title>tooltip&#45;&gt;rendermime</title>
+<path fill="none" stroke="black" d="M358.08,-185.823C375.26,-197.434 400.44,-214.359 422.585,-228.888 428.865,-233.008 435.59,-237.367 442.069,-241.54"/>
+<polygon fill="black" stroke="black" points="440.38,-244.615 450.685,-247.075 444.163,-238.725 440.38,-244.615"/>
+</g>
+</g>
+</svg>

docs/extensions_dev.md

@@ -35,6 +35,10 @@ The default plugins in the JupyterLab application include:
 - [Console](https://github.com/jupyterlab/jupyterlab/blob/master/packages/console-extension/src/index.ts) - Adds the ability to launch Jupyter Console instances for
 interactive kernel console sessions.
 
+A dependency graph for the core JupyterLab plugins
+(along with links to their source) is shown here:
+![dependencies](dependency-graph.svg)
+
 ## Application Object
 The JupyterLab Application object is given to each plugin in
 its `activate()` function.  The Application object has a:

docs/scripts/graph-dependencies.js

@@ -0,0 +1,63 @@
+var childProcess = require('child_process');
+var fs = require('fs-extra');
+var glob = require('glob');
+var path = require('path');
+
+var basePath = path.resolve('..');
+var baseUrl = 'https://github.com/jupyterlab/jupyterlab/tree/master/packages';
+var packages = glob.sync(path.join(basePath, 'packages/*'));
+
+// Begin the graph specification
+var text = 'digraph G {\n';
+text += 'ratio = 0.6;\n';
+text += 'rankdir=LR;\n';
+
+
+packages.forEach(function(packagePath) {
+
+  // Load the package.json data.
+  var dataPath = path.join(packagePath, 'package.json');
+  try {
+    var data = require(dataPath);
+  } catch (e) {
+    return;
+  }
+
+  // Don't include private packages.
+  if (data.private === true) {
+    return;
+  }
+
+  // Only include packages in the @jupyterlab namespace.
+  if (data.name.indexOf('@jupyterlab') === -1) {
+    return;
+  }
+
+  // In order to cut down on the number of graph nodes,
+  // don't include "*-extension" packages.
+  if (data.name.indexOf('-extension') !== -1 ) {
+    return;
+  }
+
+  // Construct a URL to the package on GitHub.
+  var Url = path.join(baseUrl, path.basename(packagePath));
+  
+  // Remove the '@jupyterlab' part of the name.
+  var name = '"'+data.name.split('/')[1] +'"';
+  text += name + '[URL="' + Url + '"];\n';
+
+  var deps = data.dependencies || [];
+  for (var dep in deps) {
+    // Don't include non-jupyterlab dependencies.
+    if (dep.indexOf('@jupyterlab') === -1) {
+      continue;
+    }
+    dep = '"'+dep.split('/')[1]+'"';
+    text += name + ' -> ' + dep + ';\n';
+  }
+});
+
+text += '}\n';
+fs.writeFileSync('./dependencies.gv', text);
+childProcess.execSync('cat dependencies.gv | tred | dot -Tsvg -o dependency-graph.svg')
+fs.unlink('./dependencies.gv');