Change detection and tracking.

src/xp-counter.ts

@@ -0,0 +1,72 @@
+import { Disposable, workspace, window, StatusBarItem, TextDocument, StatusBarAlignment, TextDocumentChangeEvent, Range } from "vscode";
+import { Pulse } from "./pulse";
+
+export class XpCounter {
+    private combinedDisposable: Disposable;
+    private statusBarItem: StatusBarItem;
+    private pulse: Pulse;
+    private languages: Array<string> = ["typescript", "javascript"];
+    private changeCount: number = 0;
+
+    constructor() {
+        console.log(`Supported languages for Code::Stats are ${this.languages}`);
+        this.pulse = new Pulse();
+
+        if (!this.statusBarItem) {
+            this.statusBarItem = window.createStatusBarItem(StatusBarAlignment.Left);
+        }
+
+        let subscriptions: Disposable[] = [];
+        workspace.onDidChangeTextDocument(this.onTextDocumentChanged, this, subscriptions);
+        this.combinedDisposable = Disposable.from(...subscriptions);
+    }
+
+    dispose(): void {
+        this.combinedDisposable.dispose();
+        this.statusBarItem.dispose();
+    }
+
+    private onTextDocumentChanged(event: TextDocumentChangeEvent): void {
+        let changeCount: number = 0;
+        for (let change of event.contentChanges) {
+            changeCount += this.determineChangeCount(change.range);
+        }
+        this.updateXpCount(event.document, changeCount);
+    }
+
+    private determineChangeCount(range: Range): number {
+        if (range === null || range === undefined ) {
+            return 0;
+        }
+        // console.log(`L${range.start.line}C${range.start.character} to L${range.end.line}C${range.end.character}`);
+        if (range.start.line === range.end.line) {
+            if (range.start.character === range.end.character) {
+                return 1;
+            } else {
+                console.log(`L${range.start.line}C${range.start.character} to L${range.end.line}C${range.end.character}`);
+                return range.end.character - range.start.character;
+            }
+        }
+        // todo detect multiline changes
+        return 1;
+    }
+
+    public updateXpCount(document: TextDocument, changeCount: number): void {
+        // only update xp if one of supported languages
+        if (this.isSupportedLanguage(document.languageId)) {
+            this.pulse.addXP(document.languageId, changeCount);
+            // this.statusBarItem.text = this.changeCount !== 1 ?
+            //    ` C::S  ${this.changeCount} Words` : "$(pencil) C::S 1 Word";
+            this.statusBarItem.text = `C::S $(pencil) ${this.pulse.getXP(document.languageId)}`;
+            this.statusBarItem.show();
+        } else {
+            this.statusBarItem.hide();
+        }
+    }
+
+    private isSupportedLanguage(language: string): boolean {
+        // todo: check supported languages
+        return true;
+    }
+
+}