Adds sha hint to commit details

src/system/mru.ts

@@ -39,6 +39,22 @@ export class MRU {
 		return this.stack.length > 0 ? this.stack[0] : undefined;
 	}
 
+	insert(item: T, ref?: T): void {
+		const index =
+			ref == null
+				? -1
+				: this.comparator != null
+				? this.stack.findIndex(i => this.comparator!(ref, i))
+				: this.stack.indexOf(ref);
+		if (index === -1) {
+			this.add(item);
+			this._position = 1;
+		} else {
+			this.stack.splice(index, 0, item);
+			this._position = index + 1;
+		}
+	}
+
 	navigate(direction: 'back' | 'forward'): T | undefined {
 		if (this.stack.length <= 1) return undefined;
 

src/webviews/apps/commitDetails/commitDetails.html

@@ -118,6 +118,9 @@
 									title="Forward"
 									><code-icon icon="arrow-right" data-region="commit-forward"></code-icon
 								></a>
+								<a class="commit-action commit-action--emphasis-low" href="#" title="View this Commit"
+									><code-icon icon="git-commit"></code-icon><span data-region="commit-hint"></span
+								></a>
 							</div>
 							<div class="commit-details__actionbar-group">
 								<a

src/webviews/apps/commitDetails/commitDetails.scss

@@ -391,6 +391,10 @@ ul {
 	&.is-hidden {
 		display: none;
 	}
+
+	&--emphasis-low:not(:hover, :focus, :active) {
+		opacity: 0.5;
+	}
 }
 
 .commit-details {

src/webviews/apps/commitDetails/commitDetails.ts

@@ -315,6 +315,22 @@ export class CommitDetailsApp extends App> {
 			$forward.setAttribute('aria-hidden', 'false');
 			$forward.classList.toggle('is-hidden', false);
 		}
+
+		const $hint = document.querySelector<HTMLElement>('[data-region="commit-hint"]');
+		if ($hint == null) return;
+		const $hintAction = $hint.closest('.commit-action')!;
+		if (state.navigationStack.hint) {
+			$hint.innerText = state.navigationStack.hint;
+			$hintAction.setAttribute('aria-hidden', 'false');
+			$hintAction.classList.toggle('is-hidden', false);
+			$hintAction.setAttribute('data-action', state.pinned ? 'forward' : 'back');
+		} else {
+			$hint.innerText = '';
+			$hintAction.removeAttribute('data-action');
+			$hintAction.removeAttribute('title');
+			$hintAction.setAttribute('aria-hidden', 'true');
+			$hintAction.classList.toggle('is-hidden', true);
+		}
 	}
 
 	renderPin(state: CommitState) {

src/webviews/commitDetails/commitDetailsWebview.ts

@@ -177,14 +177,20 @@ export class CommitDetailsWebviewProvider implements WebviewProvider
 	private onCommitSelected(e: CommitSelectedEvent) {
 		if (
 			e.data == null ||
-			(this._pinned && e.data.interaction === 'passive') ||
 			(this.options.mode === 'graph' && e.source !== 'gitlens.views.graph') ||
 			(this.options.mode === 'default' && e.source === 'gitlens.views.graph')
 		) {
 			return;
 		}
 
-		void this.host.show(false, { preserveFocus: e.data.preserveFocus }, e.data);
+		if (this._pinned && e.data.interaction === 'passive') {
+			console.log('[stack] add to stack');
+			const current = this._commitStack.get();
+			this._commitStack.insert(getReferenceFromRevision(e.data.commit), current);
+			this.updateNavigationStack();
+		} else {
+			void this.host.show(false, { preserveFocus: e.data.preserveFocus }, e.data);
+		}
 	}
 
 	includeBootstrap(): Promise<Serialized<State>> {
@@ -283,6 +289,8 @@ export class CommitDetailsWebviewProvider implements WebviewProvider
 
 		if (this._pinned) return;
 
+		if (this._pinned) return;
+
 		if (this.options.mode !== 'graph') {
 			const { lineTracker } = this.container;
 			this._lineTrackerDisposable = lineTracker.subscribe(
@@ -555,7 +563,8 @@ export class CommitDetailsWebviewProvider implements WebviewProvider
 				this._commitStack.add(getReferenceFromRevision(commit));
 			}
 
-			let sha = this._commitStack.get(this._commitStack.position + 1)?.ref;
+			const hintPosition = this._pinned ? this._commitStack.position - 1 : this._commitStack.position + 1;
+			let sha = this._commitStack.get(hintPosition)?.ref;
 			if (sha != null) {
 				sha = shortenRevision(sha);
 			}
@@ -663,6 +672,22 @@ export class CommitDetailsWebviewProvider implements WebviewProvider
 		this._notifyDidChangeStateDebounced();
 	}
 
+	private updateNavigationStack() {
+		const hintPosition = this._pinned ? this._commitStack.position - 1 : this._commitStack.position + 1;
+		let sha = this._commitStack.get(hintPosition)?.ref;
+		if (sha != null) {
+			sha = shortenRevision(sha);
+		}
+		this.updatePendingContext({
+			navigationStack: {
+				count: this._commitStack.count,
+				position: this._commitStack.position,
+				hint: sha,
+			},
+		});
+		this.updateState();
+	}
+
 	private async notifyDidChangeState() {
 		const scope = getLogScope();
 

src/webviews/commitDetails/protocol.ts

@@ -52,6 +52,7 @@ export type State = {
 	navigationStack: {
 		count: number;
 		position: number;
+		hint?: string;
 	};
 };