Record repl commands into history file (#1708)

* Add german translation

* Add trailing comma

* Record repl commands into a history file

* Remove translation files

* Save history file to output directory

Author: hubidu

lib/history.js

@@ -0,0 +1,39 @@
+const fs = require('fs');
+const path = require('path');
+
+const output = require('./output');
+const colors = require('chalk');
+
+/**
+ * REPL history records REPL commands and stores them in
+ * a file (~history) when session ends.
+ */
+class ReplHistory {
+  constructor() {
+    this.commands = [];
+  }
+
+  push(cmd) {
+    this.commands.push(cmd);
+  }
+
+  pop() {
+    this.commands.pop();
+  }
+
+  save() {
+    if (this.commands.length === 0) {
+      return;
+    }
+
+    const historyFile = path.join(global.output_dir, 'cli-history');
+    const commandSnippet = `\n\n<<< Recorded commands on ${new Date()}\n${this.commands.join('\n')}`;
+    fs.appendFileSync(historyFile, commandSnippet);
+
+    output.print(colors.yellow(` Commands have been saved to ${historyFile}`));
+
+    this.commands = [];
+  }
+}
+
+module.exports = new ReplHistory();

lib/pause.js

@@ -1,4 +1,5 @@
 const container = require('./container');
+const history = require('./history');
 const store = require('./store');
 const recorder = require('./recorder');
 const event = require('./event');
@@ -58,18 +59,27 @@ function parseInput(cmd) {
     finish();
     recorder.session.restore();
     rl.close();
+    history.save();
     return nextStep();
   }
   store.debugMode = true;
   try {
     const locate = global.locate; // enable locate in this context
     const I = container.support('I');
-    eval(`I.${cmd}`); // eslint-disable-line no-eval
+
+    const fullCommand = `I.${cmd}`;
+    eval(fullCommand); // eslint-disable-line no-eval
+
+    history.push(fullCommand); // add command to history when successful
   } catch (err) {
     output.print(output.styles.error(' ERROR '), err.message);
   }
   recorder.session.catch((err) => {
     const msg = err.cliMessage ? err.cliMessage() : err.message;
+
+    // pop latest command from history because it failed
+    history.pop();
+
     return output.print(output.styles.error(' FAIL '), msg);
   });
   recorder.add('ask for next step', askForStep);