ci: Fix symlinks on Windows (#243)

* ci: provide a fix for broken lerna symlinks on windows
* Update appveyor.yml

.vscode/launch.json

@@ -0,0 +1,17 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "type": "node",
+            "request": "launch",
+            "name": "Launch Program",
+            "skipFiles": [
+                "<node_internals>/**"
+            ],
+            "program": "${file}"
+        }
+    ]
+}

appveyor.yml

@@ -6,9 +6,7 @@
 environment:
   matrix:
     # node.js
-    # - nodejs_version: "12"
-    # - nodejs_version: "Current"
-    - nodejs_version: "13"
+    - nodejs_version: "12"
     - nodejs_version: "10"
 
 # Install scripts. (runs after repo cloning)

build_tools/bin/symlink.js

@@ -0,0 +1,115 @@
+#!/usr/bin/env node
+
+// See: https://github.com/microsoft/vscode-languageserver-node/blob/master/build/bin/linking.js
+
+const path  = require('path');
+const shell = require('shelljs');
+
+const fs = require('fs');
+const promisify = require('util').promisify;
+const mkdir = promisify(fs.mkdir);
+const exists = promisify(fs.exists);
+const readdir = promisify(fs.readdir);
+const readFile = promisify(fs.readFile);
+
+/**
+ * @param {string} module
+ * @param {string} name
+ * @param {string} source
+ */
+async function symlink(module, name, source) {
+    const current = process.cwd();
+    try {
+        const nodeModules = path.join(module, 'node_modules');
+        if (!await exists(nodeModules)) {
+            await mkdir(nodeModules);
+        }
+        process.chdir(nodeModules);
+        if (await exists(name)) {
+            shell.rm('-rf' , name);
+        }
+        shell.ln('-s', source, name);
+    } finally {
+        process.chdir(current);
+    }
+}
+
+/**
+ *
+ * @param {string} file
+ * @returns {Object|undefined}
+ */
+async function readPackage(file) {
+    if (!(await exists(file))) {
+        return undefined;
+    }
+
+    const json = await readFile(file, 'utf8');
+    return JSON.parse(json);
+}
+
+/**
+ *
+ * @param {string} dir
+ * @returns {Object[]} returns the contents of package.json keyed by the directory
+ */
+async function readPackages(dir) {
+    const packageDirs = await readdir(dir);
+
+    const packages = [];
+    for (const package of packageDirs) {
+        const packageDir = path.join(dir, package);
+        const p = await readPackage(path.join(packageDir, 'package.json'));
+        if (p) {
+            p._packageDir = packageDir;
+            packages.push(p);
+        }
+    }
+
+    return packages;
+}
+
+/**
+ * @param {Object[]} packages
+ * @returns {Map<string,string}
+ */
+function mapByPackageName(packages) {
+    const map = new Map(
+        packages
+        .filter(p => !!p.name)
+        .map(p => [p.name, p._packageDir])
+    );
+    return map;
+}
+
+function extractDependencies(package) {
+    return Object.keys(package.dependencies || {}).concat(Object.keys(package.devDependencies || {}));
+}
+
+/**
+ *
+ * @param {Object[]} packages
+ */
+async function symLinkPackages(packages) {
+    const mapByName = mapByPackageName(packages);
+
+    for (const package of packages) {
+        console.log('Linking ' + package.name)
+        const deps = extractDependencies(package);
+        for (dep of deps) {
+            const location = mapByName.get(dep);
+            if (location) {
+                console.log('  SymLink ' + dep)
+                await symlink(package._packageDir, dep, location)
+            }
+        }
+    }
+}
+
+async function main() {
+    const packagesRoot = path.resolve(process.argv[2] || 'packages');
+    const packages = await readPackages(packagesRoot);
+    symLinkPackages(packages);
+}
+
+main();

package.json

@@ -14,8 +14,9 @@
     "gen-coverage": "lerna run coverage",
     "install": "lerna bootstrap --ci",
     "lint-travis": "lerna run lint-travis",
-    "prepare": "npm run clean-build",
+    "prepare": "npm run symlink && npm run clean-build",
     "pub": "npm install && npm test && lerna publish",
+    "symlink": "node build_tools/bin/symlink.js packages",
     "test-spec": "lerna run test-spec",
     "test-ts": "lerna run test-ts",
     "test-watch": "lerna run --parallel test-watch",
@@ -47,6 +48,7 @@
     "@types/micromatch": "^3.1.1",
     "@types/minimatch": "^3.0.3",
     "@types/node": "^12.12.39",
+    "@types/shelljs": "^0.8.8",
     "@types/xregexp": "^4.3.0",
     "ajv-cli": "^3.1.0",
     "chai": "^4.2.0",
@@ -59,6 +61,7 @@
     "lerna": "^3.21.0",
     "lorem-ipsum": "^1.0.6",
     "rimraf": "^3.0.2",
+    "shelljs": "^0.8.4",
     "source-map-support": "^0.5.16",
     "ts-jest": "^25.3.1",
     "ts-json-schema-generator": "^0.65.0",