Programatically set OmniSharpPlugin path at dev time.

- Integrated the path setting with functional tests and F5 experience.

.vscode/tasks.json

@@ -13,10 +13,11 @@
             "problemMatcher": "$tsc-watch",
             "isBackground": true,
             "presentation": {
-                "reveal": "never"
+                "reveal": "silent"
             },
             "dependsOn": [
-                "CompileClient"
+                "CompileClient",
+                "SetupTestApps"
             ]
         },
         {
@@ -26,7 +27,7 @@
             "path": "src/Microsoft.AspNetCore.Razor.VSCode/",
             "problemMatcher": "$tsc-watch",
             "presentation": {
-                "reveal": "never"
+                "reveal": "silent"
             },
             "dependsOn": [
                 "CompileClient"
@@ -39,7 +40,17 @@
             "path": "client/",
             "problemMatcher": "$tsc-watch",
             "presentation": {
-                "reveal": "never"
+                "reveal": "silent"
+            }
+        },
+        {
+            "label": "SetupTestApps",
+            "type": "npm",
+            "script": "setupTestApps",
+            "path": "client/",
+            "problemMatcher": "$tsc-watch",
+            "presentation": {
+                "reveal": "silent"
             }
         }
     ]

build/setupTestAppSettings.js

@@ -0,0 +1,46 @@
+// The goal of this file is to enable us to programmatically set the Razor OmniSharp plugin path. Typically when project system changes
+// happen we need to wait until OmniSharp consumes those changes to properly test them. This file enables us to locate the plugin and
+// then setup the test apps to use the new plugin path.
+
+var fs = require('fs');
+var path = require('path');
+
+function findInDir(directoryPath, needle) {
+    if (!fs.existsSync(directoryPath)){
+        return;
+    }
+
+    var files = fs.readdirSync(directoryPath);
+    for (var i = 0; i < files.length; i++){
+        var filename = path.join(directoryPath, files[i]);
+
+        if (fs.lstatSync(filename).isDirectory()){
+            var result = findInDir(filename, needle);
+            if (result) {
+                return result;
+            }
+        } else if (filename.indexOf(needle) >= 0) {
+            return filename;
+        };
+    };
+}
+
+console.log('Reading existing .vscode/settings.json for test apps...');
+var vscodeSettingsPath = '../test/testapps/.vscode/settings.json';
+var bytes = fs.readFileSync(vscodeSettingsPath);
+var json = JSON.parse(bytes);
+
+console.log('Locating OmniSharp plugin dll...')
+var relativePath = findInDir('../src/Microsoft.AspNetCore.Razor.OmniSharpPlugin/bin', 'Microsoft.AspNetCore.Razor.OmniSharpPlugin.dll');
+
+if (!relativePath) {
+    console.warn('Warning: Could not locate OmniSharp plugin path. Falling back to installed plugin.');
+} else {
+    var absolutePath = path.resolve(relativePath);
+    console.log(`Found Razor plugin dll path as '${absolutePath}'.`);
+    json["razor.plugin.path"] = absolutePath;
+}
+
+console.log('Saving testapps vscode settings.');
+var stringifiedJson = JSON.stringify(json, /* replacer */ null, /* spaces */ 4);
+fs.writeFileSync(vscodeSettingsPath, stringifiedJson);

client/package.json

@@ -121,6 +121,7 @@
         }
     },
     "scripts": {
+        "setupTestApps": "node ../build/setupTestAppSettings.js",
         "vscode:prepublish": "npm run compile",
         "clean": "rimraf out",
         "compile": "npm run clean && npm run lint && tsc -p ./",
@@ -131,7 +132,7 @@
         "unittest": "npm run compile && npm run test:unitcore",
         "test:unitcore": "mocha --recursive out/unittest",
         "test:unitcore:watch": "mocha -r ts-node/register --recursive unittest/**/*.ts --watch --watch-extensions ts",
-        "test:functional": "cross-env CODE_TESTS_WORKSPACE=../test/testapps node ./node_modules/vscode/bin/test"
+        "test:functional": "npm run setupTestApps && cross-env CODE_TESTS_WORKSPACE=../test/testapps node ./node_modules/vscode/bin/test"
     },
     "devDependencies": {
         "@types/mocha": "2.2.42",