From 658b44fe50ba7995eb58e2b24fd2aa01e1c72a83 Mon Sep 17 00:00:00 2001
From: CismonX <admin@cismon.net>
Date: Thu, 11 Mar 2021 21:35:44 +0800
Subject: [PATCH] Add GNU Texinfo version indicator in status bar.

---
 src/extension.ts |  4 ++-
 src/indicator.ts | 63 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 66 insertions(+), 1 deletion(-)
 create mode 100644 src/indicator.ts

diff --git a/src/extension.ts b/src/extension.ts
index ffcd100..66e7da9 100644
--- a/src/extension.ts
+++ b/src/extension.ts
@@ -8,6 +8,7 @@
 import * as vscode from 'vscode';
 import ContextMapping from './context_mapping';
 import Diagnosis from './diagnosis';
+import Indicator from './indicator';
 import Logger from './logger';
 import Options from './options';
 import PreviewContext from './contexts/preview';
@@ -18,7 +19,8 @@ import FoldingRangeProvider from './providers/folding_range';
 
 export function activate(context: vscode.ExtensionContext) {
     context.subscriptions.push(
-        ContextMapping.instance, Diagnosis.instance, Logger.instance, Options.instance,
+        ContextMapping.instance, Diagnosis.instance, Indicator.instance, Logger.instance, Options.instance,
+        vscode.window.onDidChangeActiveTextEditor(Indicator.onTextEditorChange),
         vscode.workspace.onDidChangeTextDocument(ContextMapping.onDocumentUpdate),
         vscode.workspace.onDidSaveTextDocument(ContextMapping.onDocumentSave),
         vscode.workspace.onDidCloseTextDocument(ContextMapping.onDocumentClose),
diff --git a/src/indicator.ts b/src/indicator.ts
new file mode 100644
index 0000000..91e6968
--- /dev/null
+++ b/src/indicator.ts
@@ -0,0 +1,63 @@
+/**
+ * indicator.ts
+ * 
+ * @author CismonX <admin@cismon.net>
+ * @license MIT
+ */
+
+import * as vscode from 'vscode';
+import Options from './options';
+import { exec } from './utils/misc';
+
+export default class Indicator implements vscode.Disposable {
+
+    private static singleton?: Indicator;
+
+    private statusBarItem: vscode.StatusBarItem;
+
+    private refresh(editor?: vscode.TextEditor) {
+        if (editor === undefined || editor.document.languageId != 'texinfo') {
+            this.statusBarItem.hide();
+        } else {
+            this.statusBarItem.show();
+        }
+    }
+
+    public async updateStatus() {
+        const output = await exec(Options.makeinfo, ['--version'], Options.maxSize);
+        const result = output.data?.match(/\(GNU texinfo\) (.*)\n/);
+        let tooltip = '', icon: string, version = '';
+        if (result && result[1]) {
+            version = result[1];
+            if (!isNaN(+version) && +version < 6.7) {
+                icon = '$(warning)';
+                tooltip = `GNU Texinfo (${Options.makeinfo}) is outdated.\n` +
+                    'Please upgrade to the latest version (6.7).';
+            } else {
+                icon = '$(check)';
+            }
+        } else {
+            icon = '$(close)';
+            tooltip = `GNU Texinfo (${Options.makeinfo}) is not correctly installed or configured.`;
+        }
+        this.statusBarItem.text = `${icon} GNU Texinfo ${version}`;
+        this.statusBarItem.tooltip = tooltip;
+    }
+
+    public static onTextEditorChange(editor?: vscode.TextEditor) {
+        Indicator.instance.refresh(editor);
+    }
+
+    static get instance() {
+        return this.singleton ??= new Indicator();
+    }
+
+    private constructor() {
+        this.statusBarItem = vscode.window.createStatusBarItem(vscode.StatusBarAlignment.Right, 100);
+        this.updateStatus().then(() => this.refresh(vscode.window.activeTextEditor));
+    }
+
+    dispose() {
+        this.statusBarItem.dispose();
+    }
+}