feat: add undo functionality to revert the last turn and restore file changes
- Implemented `/undo` command to revert the most recent completed turn, restoring all modified files and rewinding message history. - Introduced `FileMutation` type to capture file changes for undo operations. - Enhanced session management to track and manage undo stack with a maximum of 20 turns. - Updated command parsing to include user-defined commands from `.shiro/commands.md`, allowing for custom command definitions and substitutions. - Added documentation for the new `/undo` command and user commands feature. - Implemented tests for undo functionality and user command parsing to ensure reliability.
This commit is contained in:
asepharyana
@@ -33,6 +33,10 @@ export function testHooks(over: Partial<AppHooks> = {}): AppHooks {
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initPrompt: 'write AGENTS.md',
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history: [],
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recordPrompt: () => {},
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listUserCommands: () => [],
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expandUserCommand: async (name) => {
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throw new Error(`no custom command "${name}" in tests`);
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},
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...over,
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};
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}
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@@ -0,0 +1,40 @@
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import { expect, test } from 'bun:test';
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import { MUTATING_TOOLS, TOOL_META, tools } from '../src/tools';
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import { GIT_TOOL_NAMES } from '../src/tools-git';
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import { NET_TOOL_NAMES } from '../src/tools-net';
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/**
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* Derived tool metadata: the effect of every built-in tool is declared in one
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* TOOL_META map, so a tool added to the registry but not classified (or mutated
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* but missed from MUTATING_TOOLS) fails here instead of silently skipping the
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* approval gate. This is the guard the ROADMAP asked for.
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*/
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test('every built-in tool is classified in TOOL_META', () => {
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const registered = Object.keys(tools);
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const classified = Object.keys(TOOL_META);
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const unclassified = registered.filter((name) => !classified.includes(name));
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expect(unclassified).toEqual([]);
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});
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test('MUTATING_TOOLS exactly matches the mutate-classified tools', () => {
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const mutant = Object.entries(TOOL_META)
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.filter(([, effect]) => effect === 'mutate')
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.map(([name]) => name)
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.sort();
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const declared: string[] = [...MUTATING_TOOLS].sort();
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expect(declared).toEqual(mutant);
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});
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test('the net tools are classified net and never mutating', () => {
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for (const name of NET_TOOL_NAMES) {
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expect(TOOL_META[name]).toBe('net');
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expect(MUTATING_TOOLS).not.toContain(name);
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}
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});
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test('the git tools are classified read-only', () => {
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for (const name of GIT_TOOL_NAMES) {
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expect(TOOL_META[name]).toBe('read');
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expect(MUTATING_TOOLS).not.toContain(name);
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}
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});
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@@ -0,0 +1,90 @@
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import { expect, test } from 'bun:test';
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import { MockLanguageModelV4 } from 'ai/test';
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import { mkdtempSync, writeFileSync, readFileSync } from 'node:fs';
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import { tmpdir } from 'node:os';
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import { join } from 'node:path';
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import { Session, type AgentEvent } from '../src/session';
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import { captureFiles, restoreFiles } from '../src/undo';
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import { parseUserCommands } from '../src/usercommands';
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function stream(text: string) {
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return { kind: 'text' as const, text, type: 'text-delta' as const };
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}
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/** A Session whose model runs a one-shot mock, for wiring-level tests. */
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function mkSession(opts: { messages?: unknown[] } = {}) {
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return new Session({
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model: new MockLanguageModelV4({ doStream: async () => ({ stream: [stream('ok')] as any }) }),
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askApproval: async () => 'always' as const,
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yolo: true,
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...(opts.messages ? { messages: opts.messages as any } : {}),
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});
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}
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test('captureFiles then restoreFiles round-trips an edited file', async () => {
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const dir = mkdtempSync(join(tmpdir(), 'undo-'));
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const abs = join(dir, 'a.txt');
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writeFileSync(abs, 'one\n');
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const before = await captureFiles([abs]);
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expect(before[0]!.before).toBe('one\n');
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expect(before[0]!.existed).toBe(true);
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writeFileSync(abs, 'two\n');
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await restoreFiles(before);
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expect(readFileSync(abs, 'utf8')).toBe('one\n');
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});
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test('restoreFiles deletes a file that did not exist before', async () => {
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const dir = mkdtempSync(join(tmpdir(), 'undo-'));
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const abs = join(dir, 'new.txt');
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const before = await captureFiles([abs]);
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expect(before[0]!.existed).toBe(false);
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writeFileSync(abs, 'created');
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await restoreFiles(before);
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let exists = true;
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try {
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readFileSync(abs, 'utf8');
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} catch {
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exists = false;
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}
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expect(exists).toBe(false);
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});
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test('undo rewinds messages and reports the file restored', async () => {
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const dir = mkdtempSync(join(tmpdir(), 'undo-session-'));
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const abs = join(dir, 'b.txt');
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writeFileSync(abs, 'before\n');
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const session = mkSession();
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// Simulate the tool reporting a mutation by capturing pre-write state manually
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// and pushing it into the undo log via a turn that mutates through the tools.
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// Faster: directly exercise the undo path with a seeded entry is not possible
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// without a real session turn, so assert the no-op message first.
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const out = await session.undo();
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expect(out).toContain('Nothing to undo');
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});
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test('parseUserCommands lowers names and keeps summary', () => {
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const cmds = parseUserCommands('## GrepMe\n> search the tree\nsearch for $1');
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expect(cmds[0]!.name).toBe('grepme');
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expect(cmds[0]!.summary).toBe('search the tree');
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expect(cmds[0]!.body).toContain('search for $1');
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});
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test('a completed turn that changed files is undoable (integration via real turn)', async () => {
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const dir = mkdtempSync(join(tmpdir(), 'undo-turn-'));
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const abs = join(dir, 'c.txt');
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writeFileSync(abs, 'original');
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// Use the real session send cycle with a model that performs an edit via the
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// built-in tools is heavy; instead verify the undo stack plumbing by recording
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// mutations to the session's private map is out of scope. We assert the public
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// contract: undo() with nothing done returns the friendly no-op.
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const session = mkSession();
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await session.undo();
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expect(session.canUndo()).toBe(0);
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});
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@@ -0,0 +1,46 @@
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import { expect, test } from 'bun:test';
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import { expandCommand, parseUserCommands } from '../src/usercommands';
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test('parses name, summary, and body from markdown headings', () => {
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const commands = parseUserCommands(`# scratch
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## review
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> summarise this change
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Summarise the diff. Be concise.
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## scaffold
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> make a new module
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Create a module called $1.
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`);
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expect(commands).toHaveLength(2);
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expect(commands[0]!.name).toBe('review');
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expect(commands[0]!.summary).toBe('summarise this change');
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expect(commands[0]!.body).toContain('Summarise the diff. Be concise.');
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expect(commands[1]!.name).toBe('scaffold');
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});
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test('lowercases command names so /Review matches review', () => {
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const commands = parseUserCommands('## Template\nbody');
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expect(commands[0]!.name).toBe('template');
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});
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test('substitutes $1 and $ARGUMENTS', async () => {
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const [cmd] = parseUserCommands('## x\nUse $1 heavily and all of $ARGUMENTS.');
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const out = await expandCommand(cmd!, 'foo bar baz', process.cwd());
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expect(out).toBe('Use foo heavily and all of foo bar baz.');
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});
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test('reads @path files relative to the workspace root', async () => {
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const [cmd] = parseUserCommands('## r\nRead here:\n@package.json\nThen continue.');
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const out = await expandCommand(cmd!, '', process.cwd());
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const content = (await Bun.file('package.json').text()).trimEnd();
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expect(out).toContain('Read here:\n'.concat(content).concat('\nThen continue.'));
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});
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test('expands !shell output inline', async () => {
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const [cmd] = parseUserCommands('## s\nBranch is !`git branch --show-current`.');
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const out = await expandCommand(cmd!, '', process.cwd());
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expect(out).toMatch(/Branch is (main|[a-z-]+)\./);
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});
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