OODA Computer Control

// get_diff_preview tool implementation // Preview changes without applying them import fs from 'fs'; import path from 'path'; import { logAudit } from '../../audit.js'; import { detectLineEnding, normalizeLineEndings } from './lineEndings.js'; import { countOccurrences, recursiveFuzzyIndexOf } from './fuzzySearch.js'; import { generateDiff, formatInlineDiff, formatSideBySide, summarizeDiff } from './diffVisualizer.js'; export interface GetDiffPreviewArgs { path: string; search: string; replace: string; format?: 'unified' | 'inline' | 'sidebyside'; contextLines?: number; } export interface GetDiffPreviewResult { success: boolean; format: string; preview: string; stats: { additions: number; deletions: number; chunksChanged: number; }; occurrencesFound: number; } /** * Handle get_diff_preview tool call * Generates a preview of changes without applying them */ export async function handleGetDiffPreview(args: GetDiffPreviewArgs): Promise<{ content: Array<{ type: string; text: string }>; isError?: boolean; }> { const { path: filePath, search, replace, format = 'unified', contextLines = 3 } = args; try { const result = await performGetDiffPreview( filePath, search, replace, format, contextLines ); await logAudit('get_diff_preview', { path: filePath, searchLength: search.length, replaceLength: replace.length, format }, { success: result.success }); return { content: [{ type: 'text', text: formatPreviewResponse(result) }], isError: !result.success }; } catch (error: any) { await logAudit('get_diff_preview', args, null, error.message); return { content: [{ type: 'text', text: `Error: ${error.message}` }], isError: true }; } } /** * Core get_diff_preview logic */ async function performGetDiffPreview( filePath: string, search: string, replace: string, format: 'unified' | 'inline' | 'sidebyside', contextLines: number ): Promise<GetDiffPreviewResult> { // Check file exists if (!fs.existsSync(filePath)) { return { success: false, format, preview: `File not found: ${filePath}`, stats: { additions: 0, deletions: 0, chunksChanged: 0 }, occurrencesFound: 0 }; } // Read file content const content = fs.readFileSync(filePath, 'utf-8'); const fileLineEnding = detectLineEnding(content); // Normalize search string to match file's line endings const normalizedSearch = normalizeLineEndings(search, fileLineEnding); const normalizedReplace = normalizeLineEndings(replace, fileLineEnding); // Count occurrences const occurrences = countOccurrences(content, normalizedSearch); if (occurrences === 0) { // Try fuzzy match for feedback const fuzzyMatch = recursiveFuzzyIndexOf(content, normalizedSearch); return { success: false, format, preview: `Search text not found. Closest match (${Math.round(fuzzyMatch.similarity * 100)}% similar):\n"${fuzzyMatch.value.substring(0, 100)}${fuzzyMatch.value.length > 100 ? '...' : ''}"`, stats: { additions: 0, deletions: 0, chunksChanged: 0 }, occurrencesFound: 0 }; } // Generate the preview content (replace first occurrence) const index = content.indexOf(normalizedSearch); const previewContent = content.substring(0, index) + normalizedReplace + content.substring(index + normalizedSearch.length); let preview: string; const diffResult = generateDiff(content, previewContent, path.basename(filePath), contextLines); switch (format) { case 'inline': preview = formatInlineDiff(normalizedSearch, normalizedReplace); break; case 'sidebyside': preview = formatSideBySide(normalizedSearch, normalizedReplace, 50); break; case 'unified': default: preview = diffResult.unified; break; } return { success: true, format, preview, stats: { additions: diffResult.stats.additions, deletions: diffResult.stats.deletions, chunksChanged: diffResult.stats.changes }, occurrencesFound: occurrences }; } /** * Format the result for display */ function formatPreviewResponse(result: GetDiffPreviewResult): string { if (!result.success) { return result.preview; } let output = `**Diff Preview (${result.format} format)**\n`; output += `Found ${result.occurrencesFound} occurrence(s)\n\n`; if (result.format === 'unified') { output += `\`\`\`diff\n${result.preview}\n\`\`\``; } else { output += `\`\`\`\n${result.preview}\n\`\`\``; } output += `\n\n**Stats:** ${summarizeDiff({ hunks: [], unified: '', inline: '', stats: { additions: result.stats.additions, deletions: result.stats.deletions, changes: result.stats.chunksChanged } })}`; return output; }