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/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import { EditorType, openDiff } from '../utils/editor.js';
import os from 'os';
import path from 'path';
import fs from 'fs';
import * as Diff from 'diff';
import { DEFAULT_DIFF_OPTIONS } from './diffOptions.js';
import { isNodeError } from '../utils/errors.js';
import { AnyDeclarativeTool, DeclarativeTool, ToolResult } from './tools.js';
/**
* A declarative tool that supports a modify operation.
*/
export interface ModifiableDeclarativeTool<TParams extends object>
extends DeclarativeTool<TParams, ToolResult> {
getModifyContext(abortSignal: AbortSignal): ModifyContext<TParams>;
}
export interface ModifyContext<ToolParams> {
getFilePath: (params: ToolParams) => string;
getCurrentContent: (params: ToolParams) => Promise<string>;
getProposedContent: (params: ToolParams) => Promise<string>;
createUpdatedParams: (
oldContent: string,
modifiedProposedContent: string,
originalParams: ToolParams,
) => ToolParams;
}
export interface ModifyResult<ToolParams> {
updatedParams: ToolParams;
updatedDiff: string;
}
/**
* Type guard to check if a declarative tool is modifiable.
*/
export function isModifiableDeclarativeTool(
tool: AnyDeclarativeTool,
): tool is ModifiableDeclarativeTool<object> {
return 'getModifyContext' in tool;
}
function createTempFilesForModify(
currentContent: string,
proposedContent: string,
file_path: string,
): { oldPath: string; newPath: string } {
const tempDir = os.tmpdir();
const diffDir = path.join(tempDir, 'gemini-cli-tool-modify-diffs');
if (!fs.existsSync(diffDir)) {
fs.mkdirSync(diffDir, { recursive: true });
}
const ext = path.extname(file_path);
const fileName = path.basename(file_path, ext);
const timestamp = Date.now();
const tempOldPath = path.join(
diffDir,
`gemini-cli-modify-${fileName}-old-${timestamp}${ext}`,
);
const tempNewPath = path.join(
diffDir,
`gemini-cli-modify-${fileName}-new-${timestamp}${ext}`,
);
fs.writeFileSync(tempOldPath, currentContent, 'utf8');
fs.writeFileSync(tempNewPath, proposedContent, 'utf8');
return { oldPath: tempOldPath, newPath: tempNewPath };
}
function getUpdatedParams<ToolParams>(
tmpOldPath: string,
tempNewPath: string,
originalParams: ToolParams,
modifyContext: ModifyContext<ToolParams>,
): { updatedParams: ToolParams; updatedDiff: string } {
let oldContent = '';
let newContent = '';
try {
oldContent = fs.readFileSync(tmpOldPath, 'utf8');
} catch (err) {
if (!isNodeError(err) || err.code !== 'ENOENT') throw err;
oldContent = '';
}
try {
newContent = fs.readFileSync(tempNewPath, 'utf8');
} catch (err) {
if (!isNodeError(err) || err.code !== 'ENOENT') throw err;
newContent = '';
}
const updatedParams = modifyContext.createUpdatedParams(
oldContent,
newContent,
originalParams,
);
const updatedDiff = Diff.createPatch(
path.basename(modifyContext.getFilePath(originalParams)),
oldContent,
newContent,
'Current',
'Proposed',
DEFAULT_DIFF_OPTIONS,
);
return { updatedParams, updatedDiff };
}
function deleteTempFiles(oldPath: string, newPath: string): void {
try {
fs.unlinkSync(oldPath);
} catch {
console.error(`Error deleting temp diff file: ${oldPath}`);
}
try {
fs.unlinkSync(newPath);
} catch {
console.error(`Error deleting temp diff file: ${newPath}`);
}
}
/**
* Triggers an external editor for the user to modify the proposed content,
* and returns the updated tool parameters and the diff after the user has modified the proposed content.
*/
export async function modifyWithEditor<ToolParams>(
originalParams: ToolParams,
modifyContext: ModifyContext<ToolParams>,
editorType: EditorType,
_abortSignal: AbortSignal,
onEditorClose: () => void,
): Promise<ModifyResult<ToolParams>> {
const currentContent = await modifyContext.getCurrentContent(originalParams);
const proposedContent =
await modifyContext.getProposedContent(originalParams);
const { oldPath, newPath } = createTempFilesForModify(
currentContent,
proposedContent,
modifyContext.getFilePath(originalParams),
);
try {
await openDiff(oldPath, newPath, editorType, onEditorClose);
const result = getUpdatedParams(
oldPath,
newPath,
originalParams,
modifyContext,
);
return result;
} finally {
deleteTempFiles(oldPath, newPath);
}
}
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