Initial Collapsible Treeview Implementation

Set up cli and local webpage. Initial pass at logic based on the 'Rentals'  example.

cli/morphir-elm-treeview.js

@@ -0,0 +1,92 @@
+#!/usr/bin/env node
+"use strict";
+
+// NPM imports
+const path = require("path");
+const util = require("util");
+const fs = require("fs");
+const readFile = util.promisify(fs.readFile);
+const commander = require("commander");
+const express = require("express");
+
+// Set up Commander
+const program = new commander.Command();
+program
+  .name("morphir-elm treeview")
+  .description("Start up a web server and expose treeview through a web UI")
+  .option("-p, --port <port>", "Port to bind the web server to.", "3000")
+  .option("-o, --host <host>", "Host to bind the web server to.", "localhost")
+  .option(
+    "-i, --project-dir <path>",
+    "Root directory of the project where morphir.json is located.",
+    "."
+  )
+  .parse(process.argv);
+
+const app = express();
+const port = program.opts().port;
+
+const webDir = path.join(__dirname, "treeview", "dist");
+
+app.use(express.static(webDir, { index: false }));
+app.use(express.json({ limit: "100mb" }));
+
+app.get(
+  "/",
+  wrap(async (req, res, next) => {
+    res.setHeader("Content-type", "text/html");
+    res.send(await indexHtmlWithVersion());
+  })
+);
+
+createSimpleGetJsonApi(app, "morphir.json");
+createSimpleGetJsonApi(app, "morphir-ir.json");
+
+app.get(
+  "*",
+  wrap(async (req, res, next) => {
+    res.setHeader("Content-type", "text/html");
+    res.send(await indexHtmlWithVersion());
+  })
+);
+
+app.listen(port, program.opts().host, () => {
+  console.log(
+    `Developer server listening at http://${program.opts().host}:${port}`
+  );
+});
+
+// --- Utility Functions ---
+
+function createSimpleGetJsonApi(app, filePath, defaultContent) {
+  app.get(
+    "/server/" + filePath,
+    wrap(async (req, res, next) => {
+      const jsonPath = path.join(program.opts().projectDir, filePath);
+      try {
+        const jsonContent = await readFile(jsonPath);
+        res.send(JSON.parse(jsonContent.toString()));
+      } catch (err) {
+        if (defaultContent && err.code === "ENOENT") {
+          // file does not exist, send default content
+          res.send(defaultContent);
+        } else {
+          throw err;
+        }
+      }
+    })
+  );
+}
+
+async function indexHtmlWithVersion() {
+  const packageJson = require(path.join(__dirname, "../package.json"));
+  const _indexHtml = await readFile(path.join(webDir, "index.html"), "utf8");
+  return _indexHtml.replace(
+    "__VERSION_NUMBER__",
+    packageJson.version.toString()
+  );
+}
+
+function wrap(fn) {
+  return (...args) => fn(...args).catch(args[2]);
+}

cli/morphir-elm.js

@@ -16,4 +16,5 @@ program
     .command('gen', 'Generate code from Morphir IR')
     .command('develop', 'Start up a web server and expose developer tools through a web UI')
     .command('test','Start Testing all the test cases present in morphir-ir.json')
+    .command('treeview', 'Start up a web server and expose treeview through a web UI')
     .parse(process.argv)