update package.json on plugin postinstall

This is required in order to fix autocomplete of intellij.

scm-ui/ui-plugins/src/commands/postinstall.js

@@ -0,0 +1,49 @@
+/* eslint-disable no-console */
+const path = require("path");
+const fs = require("fs");
+const { spawnSync } = require("child_process");
+
+const packageJsonPath = path.join(process.cwd(), "package.json");
+const packageJSON = JSON.parse(fs.readFileSync(packageJsonPath, "UTF-8"));
+
+const reference = require("../../package.json");
+
+const sync = (left, right, key) => {
+  if (!right[key]) {
+    right[key] = {};
+  }
+
+  let changed = false;
+
+  const keys = Object.keys(left[key]);
+  keys.forEach(name => {
+    if (right[key][name] !== left[key][name]) {
+      console.log(name, "has changed from", right[key][name], "to", left[key][name]);
+      right[key][name] = left[key][name];
+      changed = true;
+    }
+  });
+
+  return changed;
+};
+
+const update = () => {
+  let dep = sync(reference, packageJSON, "dependencies");
+  let devDep = sync(reference, packageJSON, "devDependencies");
+  return dep || devDep;
+};
+
+if (update()) {
+  console.log("dependencies changed, install new dependencies");
+
+  fs.writeFileSync(packageJsonPath, JSON.stringify(packageJSON, null, "  "), { encoding: "UTF-8" });
+
+  const result = spawnSync("yarn", ["install"], { stdio: "inherit" });
+  if (result.error) {
+    console.log("could not start yarn command:", result.error);
+    process.exit(2);
+  } else if (result.status !== 0) {
+    console.log("yarn process ends with status code:", result.status);
+    process.exit(3);
+  }
+}