add button to CLI for loading commands from file

locales/en/messages.json

@@ -2289,6 +2289,12 @@
     "cliCopySuccessful": {
         "message": "Copied!"
     },
+    "cliLoadFromFileBtn": {
+        "message": "Load from file"
+    },
+    "cliCommandsLoadedNotice": {
+        "message": "Commands loaded from `{{filename}}`. Press ENTER to confirm execution!"
+    },
 
     "loggingNote": {
         "message": "Data will be logged in this tab <span class=\"message-negative\">only</span>, leaving the tab will <span class=\"message-negative\">cancel</span> logging and application will return to its normal <strong>\"configurator\"</strong> state.<br /> You are free to select the global update period, data will be written into the log file every <strong>1</strong> second for performance reasons."

src/js/tabs/cli.js

@@ -174,6 +174,42 @@ TABS.cli.initialize = function (callback, nwGui) {
             $('.tab-cli .copy').hide();
         }
         
+        $('.tab-cli .load').click(function() {
+            var suffix = 'txt',
+                accepts = [{
+                    description: suffix.toUpperCase() + ' files', extensions: [suffix],
+                }];
+
+            chrome.fileSystem.chooseEntry({type: 'openFile', accepts: accepts}, function(entry) {
+                if (chrome.runtime.lastError) {
+                    console.error(chrome.runtime.lastError.message);
+                    return;
+                }
+
+                if (!entry) {
+                    console.log('No file selected');
+                    return;
+                }
+
+                function setCommands(result) {
+                    let notice = i18n.getMessage("cliCommandsLoadedNotice", {
+                        filename: entry.name,
+                    });
+                    textarea.val(result + "\n" + "# " + notice);
+                    // scroll to the last line to show confirmation notice
+                    textarea.scrollTop(textarea[0].scrollHeight);
+                }
+
+                entry.file((file) => {
+                    let reader = new FileReader();
+                    reader.onload = 
+                        () => setCommands(reader.result);
+                    reader.onerror = () => console.error(reader.error);
+                    reader.readAsText(file);
+                });
+            });
+        });
+
         // Tab key detection must be on keydown,
         // `keypress`/`keyup` happens too late, as `textarea` will have already lost focus.
         textarea.keydown(function (event) {

src/tabs/cli.html

@@ -16,6 +16,7 @@
     <div class="content_toolbar">
         <div class="btn save_btn pull-right">
             <a class="save" href="#" i18n="cliSaveToFileBtn"></a>
+            <a class="load" href="#" i18n="cliLoadFromFileBtn"></a>
             <a class="clear" href="#" i18n="cliClearOutputHistoryBtn"></a>
             <a class="copy" href="#" i18n="cliCopyToClipboardBtn"></a>
         </div>