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useDiffInIDE.ts
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import { randomUUID } from 'crypto'
import { basename } from 'path'
import { useEffect, useMemo, useRef, useState } from 'react'
import { logEvent } from 'src/services/analytics/index.js'
import { readFileSync } from 'src/utils/fileRead.js'
import { expandPath } from 'src/utils/path.js'
import type { PermissionOption } from '../components/permissions/FilePermissionDialog/permissionOptions.js'
import type {
MCPServerConnection,
McpSSEIDEServerConfig,
McpWebSocketIDEServerConfig,
} from '../services/mcp/types.js'
import type { ToolUseContext } from '../Tool.js'
import type { FileEdit } from '../tools/FileEditTool/types.js'
import {
getEditsForPatch,
getPatchForEdits,
} from '../tools/FileEditTool/utils.js'
import { getGlobalConfig } from '../utils/config.js'
import { getPatchFromContents } from '../utils/diff.js'
import { isENOENT } from '../utils/errors.js'
import {
callIdeRpc,
getConnectedIdeClient,
getConnectedIdeName,
hasAccessToIDEExtensionDiffFeature,
} from '../utils/ide.js'
import { WindowsToWSLConverter } from '../utils/idePathConversion.js'
import { logError } from '../utils/log.js'
import { getPlatform } from '../utils/platform.js'
type Props = {
onChange(
option: PermissionOption,
input: {
file_path: string
edits: FileEdit[]
},
): void
toolUseContext: ToolUseContext
filePath: string
edits: FileEdit[]
editMode: 'single' | 'multiple'
}
export function useDiffInIDE({
onChange,
toolUseContext,
filePath,
edits,
editMode,
}: Props): {
closeTabInIDE: () => void
showingDiffInIDE: boolean
ideName: string
hasError: boolean
} {
const isUnmounted = useRef(false)
const [hasError, setHasError] = useState(false)
const sha = useMemo(() => randomUUID().slice(0, 6), [])
const tabName = useMemo(
() => `✻ [Claude Code] ${basename(filePath)} (${sha}) ⧉`,
[filePath, sha],
)
const shouldShowDiffInIDE =
hasAccessToIDEExtensionDiffFeature(toolUseContext.options.mcpClients) &&
getGlobalConfig().diffTool === 'auto' &&
// Diffs should only be for file edits.
// File writes may come through here but are not supported for diffs.
!filePath.endsWith('.ipynb')
const ideName =
getConnectedIdeName(toolUseContext.options.mcpClients) ?? 'IDE'
async function showDiff(): Promise<void> {
if (!shouldShowDiffInIDE) {
return
}
try {
logEvent('tengu_ext_will_show_diff', {})
const { oldContent, newContent } = await showDiffInIDE(
filePath,
edits,
toolUseContext,
tabName,
)
// Skip if component has been unmounted
if (isUnmounted.current) {
return
}
logEvent('tengu_ext_diff_accepted', {})
const newEdits = computeEditsFromContents(
filePath,
oldContent,
newContent,
editMode,
)
if (newEdits.length === 0) {
// No changes -- edit was rejected (eg. reverted)
logEvent('tengu_ext_diff_rejected', {})
// We close the tab here because 'no' no longer auto-closes
const ideClient = getConnectedIdeClient(
toolUseContext.options.mcpClients,
)
if (ideClient) {
// Close the tab in the IDE
await closeTabInIDE(tabName, ideClient)
}
onChange(
{ type: 'reject' },
{
file_path: filePath,
edits: edits,
},
)
return
}
// File was modified - edit was accepted
onChange(
{ type: 'accept-once' },
{
file_path: filePath,
edits: newEdits,
},
)
} catch (error) {
logError(error as Error)
setHasError(true)
}
}
useEffect(() => {
void showDiff()
// Set flag on unmount
return () => {
isUnmounted.current = true
}
// eslint-disable-next-line react-hooks/exhaustive-deps
}, [])
return {
closeTabInIDE() {
const ideClient = getConnectedIdeClient(toolUseContext.options.mcpClients)
if (!ideClient) {
return Promise.resolve()
}
return closeTabInIDE(tabName, ideClient)
},
showingDiffInIDE: shouldShowDiffInIDE && !hasError,
ideName: ideName,
hasError,
}
}
/**
* Re-computes the edits from the old and new contents. This is necessary
* to apply any edits the user may have made to the new contents.
*/
export function computeEditsFromContents(
filePath: string,
oldContent: string,
newContent: string,
editMode: 'single' | 'multiple',
): FileEdit[] {
// Use unformatted patches, otherwise the edits will be formatted.
const singleHunk = editMode === 'single'
const patch = getPatchFromContents({
filePath,
oldContent,
newContent,
singleHunk,
})
if (patch.length === 0) {
return []
}
// For single edit mode, verify we only got one hunk
if (singleHunk && patch.length > 1) {
logError(
new Error(
`Unexpected number of hunks: ${patch.length}. Expected 1 hunk.`,
),
)
}
// Re-compute the edits to match the patch
return getEditsForPatch(patch)
}
/**
* Done if:
*
* 1. Tab is closed in IDE
* 2. Tab is saved in IDE (we then close the tab)
* 3. User selected an option in IDE
* 4. User selected an option in terminal (or hit esc)
*
* Resolves with the new file content.
*
* TODO: Time out after 5 mins of inactivity?
* TODO: Update auto-approval UI when IDE exits
* TODO: Close the IDE tab when the approval prompt is unmounted
*/
async function showDiffInIDE(
file_path: string,
edits: FileEdit[],
toolUseContext: ToolUseContext,
tabName: string,
): Promise<{ oldContent: string; newContent: string }> {
let isCleanedUp = false
const oldFilePath = expandPath(file_path)
let oldContent = ''
try {
oldContent = readFileSync(oldFilePath)
} catch (e: unknown) {
if (!isENOENT(e)) {
throw e
}
}
async function cleanup() {
// Careful to avoid race conditions, since this
// function can be called from multiple places.
if (isCleanedUp) {
return
}
isCleanedUp = true
// Don't fail if this fails
try {
await closeTabInIDE(tabName, ideClient)
} catch (e) {
logError(e as Error)
}
process.off('beforeExit', cleanup)
toolUseContext.abortController.signal.removeEventListener('abort', cleanup)
}
// Cleanup if the user hits esc to cancel the tool call - or on exit
toolUseContext.abortController.signal.addEventListener('abort', cleanup)
process.on('beforeExit', cleanup)
// Open the diff in the IDE
const ideClient = getConnectedIdeClient(toolUseContext.options.mcpClients)
try {
const { updatedFile } = getPatchForEdits({
filePath: oldFilePath,
fileContents: oldContent,
edits,
})
if (!ideClient || ideClient.type !== 'connected') {
throw new Error('IDE client not available')
}
let ideOldPath = oldFilePath
// Only convert paths if we're in WSL and IDE is on Windows
const ideRunningInWindows =
(ideClient.config as McpSSEIDEServerConfig | McpWebSocketIDEServerConfig)
.ideRunningInWindows === true
if (
getPlatform() === 'wsl' &&
ideRunningInWindows &&
process.env.WSL_DISTRO_NAME
) {
const converter = new WindowsToWSLConverter(process.env.WSL_DISTRO_NAME)
ideOldPath = converter.toIDEPath(oldFilePath)
}
const rpcResult = await callIdeRpc(
'openDiff',
{
old_file_path: ideOldPath,
new_file_path: ideOldPath,
new_file_contents: updatedFile,
tab_name: tabName,
},
ideClient,
)
// Convert the raw RPC result to a ToolCallResponse format
const data = Array.isArray(rpcResult) ? rpcResult : [rpcResult]
// If the user saved the file then take the new contents and resolve with that.
if (isSaveMessage(data)) {
void cleanup()
return {
oldContent: oldContent,
newContent: data[1].text,
}
} else if (isClosedMessage(data)) {
void cleanup()
return {
oldContent: oldContent,
newContent: updatedFile,
}
} else if (isRejectedMessage(data)) {
void cleanup()
return {
oldContent: oldContent,
newContent: oldContent,
}
}
// Indicates that the tool call completed with none of the expected
// results. Did the user close the IDE?
throw new Error('Not accepted')
} catch (error) {
logError(error as Error)
void cleanup()
throw error
}
}
async function closeTabInIDE(
tabName: string,
ideClient?: MCPServerConnection | undefined,
): Promise<void> {
try {
if (!ideClient || ideClient.type !== 'connected') {
throw new Error('IDE client not available')
}
// Use direct RPC to close the tab
await callIdeRpc('close_tab', { tab_name: tabName }, ideClient)
} catch (error) {
logError(error as Error)
// Don't throw - this is a cleanup operation
}
}
function isClosedMessage(data: unknown): data is { text: 'TAB_CLOSED' } {
return (
Array.isArray(data) &&
typeof data[0] === 'object' &&
data[0] !== null &&
'type' in data[0] &&
data[0].type === 'text' &&
'text' in data[0] &&
data[0].text === 'TAB_CLOSED'
)
}
function isRejectedMessage(data: unknown): data is { text: 'DIFF_REJECTED' } {
return (
Array.isArray(data) &&
typeof data[0] === 'object' &&
data[0] !== null &&
'type' in data[0] &&
data[0].type === 'text' &&
'text' in data[0] &&
data[0].text === 'DIFF_REJECTED'
)
}
function isSaveMessage(
data: unknown,
): data is [{ text: 'FILE_SAVED' }, { text: string }] {
return (
Array.isArray(data) &&
data[0]?.type === 'text' &&
data[0].text === 'FILE_SAVED' &&
typeof data[1].text === 'string'
)
}