Make the TypeScript target work on Windows

.github/workflows/ts-tests.yml

@@ -14,7 +14,7 @@ jobs:
   run:
     strategy:
       matrix:
-        platform: [ubuntu-latest, macos-latest]
+        platform: [ubuntu-latest, macos-latest, windows-latest]
     runs-on: ${{ matrix.platform }}
     steps:
       - name: Setup Java JDK
@@ -23,13 +23,8 @@ jobs:
           java-version: 11
       - name: Setup Node.js environment
         uses: actions/setup-node@v2.1.2
-      - name: Cache .pnpm-store
-        uses: actions/cache@v1
-        with:
-          path: ~/.pnpm-store
-          key: ${{ runner.os }}-node${{ matrix.node-version }}-${{ hashFiles('**/pnpm-lock.yaml') }}
       - name: Install pnpm
-        run: sudo npm i -g pnpm
+        run: npm i -g pnpm
       - name: Install Dependencies Ubuntu
         run: sudo apt-get install libprotobuf-dev protobuf-compiler
         if: ${{ runner.os == 'Linux' }}

org.lflang.tests/src/org/lflang/tests/runtime/TypeScriptTest.java

@@ -1,5 +1,6 @@
 package org.lflang.tests.runtime;
 
+import org.junit.jupiter.api.Assumptions;
 import org.junit.jupiter.api.Test;
 import org.lflang.Target;
 import org.lflang.tests.AbstractTest;
@@ -46,6 +47,7 @@ public void runMultiportTests() {
     @Test
     @Override
     public void runSerializationTests() {
+        Assumptions.assumeFalse(isWindows(), Message.NO_WINDOWS_SUPPORT);
         super.runSerializationTests();
     }
 

org.lflang/src/lib/ts/package.json

@@ -26,11 +26,12 @@
         "@babel/preset-typescript": "^7.8.3",
         "@types/google-protobuf": "^3.7.4",
         "@types/node": "^13.9.2",
+        "rimraf": "^3.0.2",
         "typescript": "^3.8.3",
         "ts-protoc-gen": "^0.12.0"
     },
     "scripts": {
         "check-types": "tsc",
-        "build": "rm -rf dist && babel src --out-dir dist --extensions '.ts,.js'"
+        "build": "rimraf dist && babel src --out-dir dist --extensions .ts,.js"
     }
 }

org.lflang/src/org/lflang/util/LFCommand.java

@@ -33,12 +33,15 @@ STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 import java.io.PrintStream;
 import java.nio.file.Path;
 import java.nio.file.Paths;
+import java.util.ArrayDeque;
 import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.List;
 import java.util.Map;
 import java.util.concurrent.Executors;
 import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.TimeUnit;
+import java.util.stream.Collectors;
 
 import org.eclipse.xtext.util.CancelIndicator;
 
@@ -174,13 +177,8 @@ public int run(CancelIndicator cancelIndicator) {
         System.out.println("--- Current working directory: " + processBuilder.directory().toString());
         System.out.println("--- Executing command: " + String.join(" ", processBuilder.command()));
 
-        final Process process;
-        try {
-            process = processBuilder.start();
-        } catch (IOException e) {
-            e.printStackTrace();
-            return -1;
-        }
+        final Process process = startProcess();
+        if (process == null) return -1;
 
         ScheduledExecutorService poller = Executors.newSingleThreadScheduledExecutor();
         poller.scheduleAtFixedRate(
@@ -303,7 +301,7 @@ public static LFCommand get(final String cmd, final List<String> args, Path dir)
         final File cmdFile = dir.resolve(cmd).toFile();
         if (cmdFile.exists() && cmdFile.canExecute()) {
             builder = new ProcessBuilder(cmdList);
-        } else if (checkIfCommandIsOnPath(cmd, dir)) {
+        } else if (findCommand(cmd) != null) {
             builder = new ProcessBuilder(cmdList);
         } else if (checkIfCommandIsExecutableWithBash(cmd, dir)) {
             builder = new ProcessBuilder("bash", "--login", "-c", String.join(" ", cmdList));
@@ -318,23 +316,58 @@ public static LFCommand get(final String cmd, final List<String> args, Path dir)
     }
 
 
-    private static boolean checkIfCommandIsOnPath(final String command, final Path dir) {
+    /**
+     * Search for matches to the given command by following the PATH environment variable.
+     * @param command A command for which to search.
+     * @return The file locations of matches to the given command.
+     */
+    private static List<File> findCommand(final String command) {
         final String whichCmd = System.getProperty("os.name").startsWith("Windows") ? "where" : "which";
         final ProcessBuilder whichBuilder = new ProcessBuilder(List.of(whichCmd, command));
-        whichBuilder.directory(dir.toFile());
         try {
-            int whichReturn = whichBuilder.start().waitFor();
-            return whichReturn == 0;
+            Process p = whichBuilder.start();
+            if (p.waitFor() != 0) return null;
+            return Arrays.stream(new String(p.getInputStream().readAllBytes()).split("\n"))
+                .map(String::strip).map(File::new).filter(File::canExecute).collect(Collectors.toList());
         } catch (InterruptedException | IOException e) {
             e.printStackTrace();
-            return false;
+            return null;
+        }
+    }
+
+    /**
+     * Attempt to start the execution of this command.
+     * 
+     * First collect a list of paths where the executable might be found,
+     * then select an executable that successfully executes from the 
+     * list of paths. Return the {@code Process} instance that is the 
+     * result of a successful execution, or {@code null} if no successful
+     * execution happened.
+     * @return The {@code Process} that is started by this command, or {@code null} in case of failure.
+     */
+    private Process startProcess() {
+        ArrayDeque<String> commands = new ArrayDeque<>();
+        List<File> matchesOnPath = findCommand(processBuilder.command().get(0));
+        if (matchesOnPath != null) {
+            matchesOnPath.stream().map(File::toString).forEach(commands::addLast);
+        }
+        while (true) {
+            try {
+                return processBuilder.start();
+            } catch (IOException e) {
+                if (commands.isEmpty()) {
+                    e.printStackTrace();
+                    return null;
+                }
+            }
+            processBuilder.command().set(0, commands.removeFirst());
         }
     }
 
 
     private static boolean checkIfCommandIsExecutableWithBash(final String command, final Path dir) {
         // check first if bash is installed
-        if (!checkIfCommandIsOnPath("bash", dir)) {
+        if (findCommand("bash") == null) {
             return false;
         }