Adds support for composing without a base commit

src/env/node/git/git.ts

@@ -34,6 +34,7 @@ import {
 } from '../../../git/errors';
 import type { GitDir } from '../../../git/gitProvider';
 import type { GitDiffFilter } from '../../../git/models/diff';
+import { rootSha } from '../../../git/models/revision';
 import { parseGitRemoteUrl } from '../../../git/parsers/remoteParser';
 import { isUncommitted, isUncommittedStaged, shortenRevision } from '../../../git/utils/revision.utils';
 import { getCancellationTokenId } from '../../../system/-webview/cancellation';
@@ -69,9 +70,6 @@ export const maxGitCliLength = 30000;
 
 const textDecoder = new TextDecoder('utf8');
 
-// This is a root sha of all git repo's if using sha1
-const rootSha = '4b825dc642cb6eb9a060e54bf8d69288fbee4904';
-
 export const GitErrors = {
 	alreadyCheckedOut: /already checked out/i,
 	alreadyExists: /already exists/i,

src/env/node/git/sub-providers/patch.ts

@@ -177,7 +177,7 @@ export class PatchGitSubProvider implements GitPatchSubProvider {
 	@log<PatchGitSubProvider['createUnreachableCommitsFromPatches']>({ args: { 2: p => p.length } })
 	async createUnreachableCommitsFromPatches(
 		repoPath: string,
-		base: string,
+		base: string | undefined,
 		patches: { message: string; patch: string }[],
 	): Promise<string[]> {
 		// Create a temporary index file
@@ -198,7 +198,7 @@ export class PatchGitSubProvider implements GitPatchSubProvider {
 	private async createUnreachableCommitForPatchCore(
 		env: Record<string, any>,
 		repoPath: string,
-		base: string,
+		base: string | undefined,
 		message: string,
 		patch: string,
 	): Promise<string> {
@@ -222,7 +222,14 @@ export class PatchGitSubProvider implements GitPatchSubProvider {
 			const tree = result.stdout.trim();
 
 			// Create new commit from the tree
-			result = await this.git.exec({ cwd: repoPath, env: env }, 'commit-tree', tree, '-p', base, '-m', message);
+			result = await this.git.exec(
+				{ cwd: repoPath, env: env },
+				'commit-tree',
+				tree,
+				...(base ? ['-p', base] : []),
+				'-m',
+				message,
+			);
 			const sha = result.stdout.trim();
 
 			return sha;
@@ -234,6 +241,16 @@ export class PatchGitSubProvider implements GitPatchSubProvider {
 		}
 	}
 
+	async createEmptyInitialCommit(repoPath: string): Promise<string> {
+		const emptyTree = await this.git.exec({ cwd: repoPath }, 'hash-object', '-t', 'tree', '/dev/null');
+		const result = await this.git.exec({ cwd: repoPath }, 'commit-tree', emptyTree.stdout.trim(), '-m', 'temp');
+		// create ref/heaads/main and point to it
+		await this.git.exec({ cwd: repoPath }, 'update-ref', 'refs/heads/main', result.stdout.trim());
+		// point HEAD to the branch
+		await this.git.exec({ cwd: repoPath }, 'symbolic-ref', 'HEAD', 'refs/heads/main');
+		return result.stdout.trim();
+	}
+
 	@log({ args: { 1: false } })
 	async validatePatch(repoPath: string | undefined, contents: string): Promise<boolean> {
 		try {

src/env/node/git/sub-providers/staging.ts

@@ -2,6 +2,7 @@ import { promises as fs } from 'fs';
 import { tmpdir } from 'os';
 import type { Uri } from 'vscode';
 import type { Container } from '../../../../container';
+import { GitErrorHandling } from '../../../../git/commandOptions';
 import type { DisposableTemporaryGitIndex, GitStagingSubProvider } from '../../../../git/gitProvider';
 import { splitPath } from '../../../../system/-webview/path';
 import { log } from '../../../../system/decorators/log';
@@ -18,7 +19,7 @@ export class StagingGitSubProvider implements GitStagingSubProvider {
 	) {}
 
 	@log()
-	async createTemporaryIndex(repoPath: string, base: string): Promise<DisposableTemporaryGitIndex> {
+	async createTemporaryIndex(repoPath: string, base: string | undefined): Promise<DisposableTemporaryGitIndex> {
 		// Create a temporary index file
 		const tempDir = await fs.mkdtemp(joinPaths(tmpdir(), 'gl-'));
 		const tempIndex = joinPaths(tempDir, 'index');
@@ -37,24 +38,27 @@ export class StagingGitSubProvider implements GitStagingSubProvider {
 			const env = { GIT_INDEX_FILE: tempIndex };
 
 			// Create the temp index file from a base ref/sha
+			if (base) {
+				// Get the tree of the base
+				const newIndexResult = await this.git.exec(
+					{ cwd: repoPath, env: env },
+					'ls-tree',
+					'-z',
+					'-r',
+					'--full-name',
+					base,
+				);
 
-			// Get the tree of the base
-			const newIndexResult = await this.git.exec(
-				{ cwd: repoPath, env: env },
-				'ls-tree',
-				'-z',
-				'-r',
-				'--full-name',
-				base,
-			);
-
-			// Write the tree to our temp index
-			await this.git.exec(
-				{ cwd: repoPath, env: env, stdin: newIndexResult.stdout },
-				'update-index',
-				'-z',
-				'--index-info',
-			);
+				if (newIndexResult.stdout.trim()) {
+					// Write the tree to our temp index
+					await this.git.exec(
+						{ cwd: repoPath, env: env, stdin: newIndexResult.stdout },
+						'update-index',
+						'-z',
+						'--index-info',
+					);
+				}
+			}
 
 			return mixinAsyncDisposable({ path: tempIndex, env: { GIT_INDEX_FILE: tempIndex } }, dispose);
 		} catch (ex) {

src/git/gitProvider.ts

@@ -534,9 +534,10 @@ export interface GitPatchSubProvider {
 	): Promise<GitCommit | undefined>;
 	createUnreachableCommitsFromPatches(
 		repoPath: string,
-		base: string,
+		base: string | undefined,
 		patches: { message: string; patch: string }[],
 	): Promise<string[]>;
+	createEmptyInitialCommit(repoPath: string): Promise<string>;
 
 	validatePatch(repoPath: string | undefined, contents: string): Promise<boolean>;
 }
@@ -651,7 +652,7 @@ export interface DisposableTemporaryGitIndex extends UnifiedAsyncDisposable {
 }
 
 export interface GitStagingSubProvider {
-	createTemporaryIndex(repoPath: string, base: string): Promise<DisposableTemporaryGitIndex>;
+	createTemporaryIndex(repoPath: string, base: string | undefined): Promise<DisposableTemporaryGitIndex>;
 	stageFile(repoPath: string, pathOrUri: string | Uri): Promise<void>;
 	stageFiles(repoPath: string, pathOrUri: string[] | Uri[]): Promise<void>;
 	stageDirectory(repoPath: string, directoryOrUri: string | Uri): Promise<void>;

src/git/models/revision.ts

@@ -1,6 +1,8 @@
 export const deletedOrMissing = '0000000000000000000000000000000000000000-';
 export const uncommitted = '0000000000000000000000000000000000000000';
 export const uncommittedStaged = '0000000000000000000000000000000000000000:';
+// This is a root sha of all git repo's if using sha1
+export const rootSha = '4b825dc642cb6eb9a060e54bf8d69288fbee4904';
 
 export type GitRevisionRange =
 	| `${GitRevisionRangeNotation}${string}`

src/webviews/apps/plus/composer/components/app.ts

@@ -1630,6 +1630,7 @@ export class ComposerApp extends LitElement {
 					.canGenerateCommitsWithAI=${this.canGenerateCommitsWithAI}
 					.isPreviewMode=${this.isPreviewMode}
 					.baseCommit=${this.state.baseCommit}
+					.repoName=${this.state.baseCommit?.repoName ?? this.state.repositoryState?.current.name}
 					.customInstructions=${this.customInstructions}
 					.hasUsedAutoCompose=${this.state.hasUsedAutoCompose}
 					.hasChanges=${this.state.hasChanges}

src/webviews/apps/plus/composer/components/commit-item.ts

@@ -86,6 +86,9 @@ export class CommitItem extends LitElement {
 	@property({ type: Boolean })
 	first = false;
 
+	@property({ type: Boolean })
+	last = false;
+
 	override connectedCallback() {
 		super.connectedCallback?.();
 		// Set the data attribute for sortable access
@@ -120,7 +123,7 @@ export class CommitItem extends LitElement {
 			<div
 				class="composer-item commit-item ${this.selected ? ' is-selected' : ''}${this.multiSelected
 					? ' multi-selected'
-					: ''}${this.first ? ' is-first' : ''}"
+					: ''}${this.first ? ' is-first' : ''}${this.last ? ' is-last' : ''}"
 				tabindex="0"
 				@click=${this.handleClick}
 				@keydown=${this.handleClick}

src/webviews/apps/plus/composer/components/commits-panel.ts

@@ -362,6 +362,9 @@ export class CommitsPanel extends LitElement {
 	@property({ type: Object })
 	baseCommit: ComposerBaseCommit | null = null;
 
+	@property({ type: String })
+	repoName: string | null = null;
+
 	@property({ type: String })
 	customInstructions: string = '';
 
@@ -1220,13 +1223,19 @@ export class CommitsPanel extends LitElement {
 
 							<!-- Base commit (informational only) -->
 							<div class="composer-item is-base">
-								<div class="composer-item__commit"></div>
+								<div class="composer-item__commit${this.baseCommit ? '' : ' is-empty'}"></div>
 								<div class="composer-item__content">
-									<div class="composer-item__header">${this.baseCommit?.message || 'HEAD'}</div>
+									<div
+										class="composer-item__header${this.baseCommit == null ? ' is-placeholder' : ''}"
+									>
+										${this.baseCommit?.message || 'No commits yet'}
+									</div>
 									<div class="composer-item__body">
-										<span class="repo-name">${this.baseCommit?.repoName || 'Repository'}</span>
-										<span>/</span>
-										<span class="branch-name">${this.baseCommit?.branchName || 'main'}</span>
+										<span class="repo-name">${this.repoName || 'Repository'}</span>
+										${this.baseCommit?.branchName
+											? html`<span>/</span
+													><span class="branch-name">${this.baseCommit.branchName}</span>`
+											: ''}
 									</div>
 								</div>
 							</div>
@@ -1279,6 +1288,7 @@ export class CommitsPanel extends LitElement {
 											.multiSelected=${this.selectedCommitIds.has(commit.id)}
 											.isPreviewMode=${this.isPreviewMode}
 											?first=${i === 0}
+											?last=${i === this.commits.length - 1 && !this.baseCommit}
 											@click=${(e: MouseEvent) => this.dispatchCommitSelect(commit.id, e)}
 											@keydown=${(e: KeyboardEvent) => this.dispatchCommitSelect(commit.id, e)}
 										></gl-commit-item>
@@ -1289,13 +1299,17 @@ export class CommitsPanel extends LitElement {
 
 						<!-- Base commit (informational only) -->
 						<div class="composer-item is-base">
-							<div class="composer-item__commit"></div>
+							<div class="composer-item__commit${this.baseCommit ? '' : ' is-empty'}"></div>
 							<div class="composer-item__content">
-								<div class="composer-item__header">${this.baseCommit?.message || 'HEAD'}</div>
+								<div class="composer-item__header${this.baseCommit == null ? ' is-placeholder' : ''}">
+									${this.baseCommit?.message || 'No commits yet'}
+								</div>
 								<div class="composer-item__body">
-									<span class="repo-name">${this.baseCommit?.repoName || 'Repository'}</span>
-									<span>/</span>
-									<span class="branch-name">${this.baseCommit?.branchName || 'main'}</span>
+									<span class="repo-name">${this.repoName || 'Repository'}</span>
+									${this.baseCommit?.branchName
+										? html`<span>/</span
+												><span class="branch-name">${this.baseCommit.branchName}</span>`
+										: ''}
 								</div>
 							</div>
 						</div>

src/webviews/apps/plus/composer/components/composer.css.ts

@@ -148,6 +148,10 @@ export const composerItemCommitStyles = css`
 		height: 50%;
 	}
 
+	.composer-item.is-last .composer-item__commit::before {
+		display: none;
+	}
+
 	.composer-item__commit::after {
 		content: '';
 		position: absolute;
@@ -168,6 +172,11 @@ export const composerItemCommitStyles = css`
 	.composer-item.is-base .composer-item__commit::before {
 		border-left-style: solid;
 	}
+
+	.composer-item__commit.is-empty::before,
+	.composer-item__commit.is-empty::after {
+		display: none;
+	}
 `;
 
 export const composerItemContentStyles = css`

src/webviews/plus/composer/composerWebview.ts

@@ -10,6 +10,7 @@ import type {
 	RepositoryFileSystemChangeEvent,
 } from '../../../git/models/repository';
 import { RepositoryChange, RepositoryChangeComparisonMode } from '../../../git/models/repository';
+import { rootSha } from '../../../git/models/revision';
 import { sendFeedbackEvent, showUnhelpfulFeedbackPicker } from '../../../plus/ai/aiFeedbackUtils';
 import type { AIModelChangeEvent } from '../../../plus/ai/aiProviderService';
 import { getRepositoryPickerTitleAndPlaceholder, showRepositoryPicker } from '../../../quickpicks/repositoryPicker';
@@ -311,30 +312,7 @@ export class ComposerWebviewProvider implements WebviewProvider<State, State, Co
 		const { hunkMap, hunks } = createHunksFromDiffs(staged?.contents, unstaged?.contents);
 
 		const baseCommit = getSettledValue(commitResult);
-		if (baseCommit == null) {
-			const errorMessage = 'No base commit found to compose from.';
-			this.sendTelemetryEvent(isReload ? 'composer/reloaded' : 'composer/loaded', {
-				'failure.reason': 'error',
-				'failure.error.message': errorMessage,
-			});
-			return {
-				...this.initialState,
-				loadingError: errorMessage,
-			};
-		}
-
 		const currentBranch = getSettledValue(branchResult);
-		if (currentBranch == null) {
-			const errorMessage = 'No current branch found to compose from.';
-			this.sendTelemetryEvent(isReload ? 'composer/reloaded' : 'composer/loaded', {
-				'failure.reason': 'error',
-				'failure.error.message': errorMessage,
-			});
-			return {
-				...this.initialState,
-				loadingError: errorMessage,
-			};
-		}
 
 		// Create initial commit with empty message (user will add message later)
 		const hasStagedChanges = Boolean(staged?.contents);
@@ -358,7 +336,7 @@ export class ComposerWebviewProvider implements WebviewProvider<State, State, Co
 		};
 
 		// Create safety state snapshot for validation
-		const safetyState = await createSafetyState(repo, diffs, baseCommit.sha);
+		const safetyState = await createSafetyState(repo, diffs, baseCommit?.sha);
 
 		const aiEnabled = this.getAiEnabled();
 		const aiModel = await this.container.ai.getModel(
@@ -396,12 +374,14 @@ export class ComposerWebviewProvider implements WebviewProvider<State, State, Co
 			...this.initialState,
 			hunks: hunks,
 			hunkMap: hunkMap,
-			baseCommit: {
-				sha: baseCommit.sha,
-				message: baseCommit.message ?? '',
-				repoName: repo.name,
-				branchName: currentBranch.name,
-			},
+			baseCommit: baseCommit
+				? {
+						sha: baseCommit.sha,
+						message: baseCommit.message ?? '',
+						repoName: repo.name,
+						branchName: currentBranch?.name ?? 'main',
+					}
+				: null,
 			commits: commits,
 			safetyState: safetyState,
 			aiEnabled: aiEnabled,
@@ -1087,8 +1067,23 @@ export class ComposerWebviewProvider implements WebviewProvider<State, State, Co
 				throw new Error(errorMessage);
 			}
 
+			if (params.baseCommit?.sha == null) {
+				const initialCommitSha = await svc.patch?.createEmptyInitialCommit();
+				if (initialCommitSha == null) {
+					// error base we don't have an initial commit
+					this._context.errors.operation.count++;
+					this._context.operations.finishAndCommit.errorCount++;
+					const errorMessage = 'Could not create base commit';
+					this.sendTelemetryEvent('composer/action/finishAndCommit/failed', {
+						'failure.reason': 'error',
+						'failure.error.message': errorMessage,
+					});
+					throw new Error(errorMessage);
+				}
+			}
+
 			// Create unreachable commits from patches
-			const shas = await repo.git.patch?.createUnreachableCommitsFromPatches(params.baseCommit.sha, diffInfo);
+			const shas = await repo.git.patch?.createUnreachableCommitsFromPatches(params.baseCommit?.sha, diffInfo);
 
 			if (!shas?.length) {
 				this._context.errors.operation.count++;
@@ -1101,9 +1096,10 @@ export class ComposerWebviewProvider implements WebviewProvider<State, State, Co
 				throw new Error(errorMessage);
 			}
 
+			const baseRef = params.baseCommit?.sha ?? ((await repo.git.commits.getCommit('HEAD')) ? 'HEAD' : rootSha);
 			const resultingDiff = (
-				await repo.git.diff.getDiff?.(shas[shas.length - 1], params.baseCommit.sha, {
-					notation: '...',
+				await repo.git.diff.getDiff?.(shas[shas.length - 1], baseRef, {
+					notation: params.baseCommit?.sha ? '...' : undefined,
 				})
 			)?.contents;