Add event log to editor

Shows output from git pull/push and npm install in the editor

packages/node_modules/@node-red/runtime/lib/exec.js

@@ -0,0 +1,69 @@
+/**
+ * Copyright JS Foundation and other contributors, http://js.foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ **/
+
+const child_process = require('child_process');
+const { util } = require('@node-red/util');
+
+var events;
+
+function logLines(id,type,data) {
+    events.emit("event-log", {id:id,payload:{ts: Date.now(),data:data,type:type}});
+}
+
+module.exports = {
+    init: function(_runtime) {
+        events = _runtime.events;
+    },
+    run: function(command,args,options,emit) {
+        var invocationId = util.generateId();
+
+        emit && events.emit("event-log", {ts: Date.now(),id:invocationId,payload:{ts: Date.now(),data:command+" "+args.join(" ")}});
+
+        return new Promise((resolve, reject) => {
+            let stdout = "";
+            let stderr = "";
+            const child = child_process.spawn(command,args,options);
+            child.stdout.on('data', (data) => {
+                const str = ""+data;
+                stdout += str;
+                emit && logLines(invocationId,"out",str);
+            });
+            child.stderr.on('data', (data) => {
+                const str = ""+data;
+                stderr += str;
+                emit && logLines(invocationId,"err",str);
+            });
+            child.on('error', function(err) {
+                stderr = err.toString();
+                emit && logLines(invocationId,"err",stderr);
+            })
+            child.on('close', (code) => {
+                let result = {
+                    code: code,
+                    stdout: stdout,
+                    stderr: stderr
+                }
+                emit && events.emit("event-log", {id:invocationId,payload:{ts: Date.now(),data:"rc="+code}});
+
+                if (code === 0) {
+                    resolve(result)
+                } else {
+                    reject(result);
+                }
+            });
+        })
+    }
+}