@ooples/token-optimizer-mcp
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Intelligent context window optimization for Claude Code - store content externally via caching and compression, freeing up your context window for what matters
684 lines • 23.3 kB
JavaScript
/**
* Smart Merge Tool - 80% Token Reduction
*
* Achieves token reduction through:
* 1. Structured merge status (instead of raw git merge output)
* 2. Conflict-only mode (show only conflicts, not all changes)
* 3. Summary mode (counts and status, not full diffs)
* 4. Smart conflict resolution helpers
* 5. Minimal merge history (only essential info)
*
* Target: 80% reduction vs full git merge/status output
*/
import { execSync } from 'child_process';
import { join } from 'path';
import { homedir } from 'os';
import { CacheEngine } from '../../core/cache-engine.js';
import { TokenCounter } from '../../core/token-counter.js';
import { MetricsCollector } from '../../core/metrics.js';
import { generateCacheKey } from '../shared/hash-utils.js';
export class SmartMergeTool {
cache;
tokenCounter;
metrics;
constructor(cache, tokenCounter, metrics) {
this.cache = cache;
this.tokenCounter = tokenCounter;
this.metrics = metrics;
}
/**
* Smart merge operations with structured output and conflict management
*/
async merge(options = {}) {
const startTime = Date.now();
// Default options
const opts = {
cwd: options.cwd ?? process.cwd(),
mode: options.mode ?? 'status',
branch: options.branch ?? '',
commit: options.commit ?? '',
noCommit: options.noCommit ?? false,
noFf: options.noFf ?? false,
ffOnly: options.ffOnly ?? false,
squash: options.squash ?? false,
strategy: options.strategy ?? 'recursive',
strategyOption: options.strategyOption ?? [],
conflictsOnly: options.conflictsOnly ?? false,
includeContent: options.includeContent ?? false,
summaryOnly: options.summaryOnly ?? false,
maxConflicts: options.maxConflicts ?? Infinity,
resolveUsing: options.resolveUsing ?? 'ours',
useCache: options.useCache ?? true,
ttl: options.ttl ?? 60,
};
try {
// Verify git repository
if (!this.isGitRepository(opts.cwd)) {
throw new Error(`Not a git repository: ${opts.cwd}`);
}
// Get current branch
const currentBranch = this.getCurrentBranch(opts.cwd);
// Build cache key
const cacheKey = this.buildCacheKey(opts);
// Check cache (only for status mode)
if (opts.useCache && opts.mode === 'status') {
const cached = this.cache.get(cacheKey);
if (cached) {
const result = JSON.parse(cached);
result.metadata.cacheHit = true;
const duration = Date.now() - startTime;
this.metrics.record({
operation: 'smart_merge',
duration,
inputTokens: result.metadata.tokenCount,
outputTokens: 0,
cachedTokens: result.metadata.originalTokenCount,
savedTokens: result.metadata.tokensSaved,
success: true,
cacheHit: true,
});
return result;
}
}
// Perform operation based on mode
let status;
let mergeResult;
let resultTokens;
let originalTokens;
switch (opts.mode) {
case 'status':
status = this.getMergeStatus(opts);
resultTokens = this.tokenCounter.count(JSON.stringify(status)).tokens;
// Estimate original tokens (full git status + diff output)
if (opts.summaryOnly) {
originalTokens = resultTokens * 50; // Summary vs full output
}
else if (opts.conflictsOnly) {
originalTokens = resultTokens * 10; // Conflicts only vs full diff
}
else {
originalTokens = resultTokens * 5; // Structured vs raw output
}
break;
case 'merge':
if (!opts.branch && !opts.commit) {
throw new Error('branch or commit required for merge operation');
}
mergeResult = this.performMerge(opts);
resultTokens = this.tokenCounter.count(JSON.stringify(mergeResult)).tokens;
originalTokens = resultTokens * 8; // Structured result vs full merge output
break;
case 'abort':
this.abortMerge(opts.cwd);
mergeResult = {
success: true,
merged: false,
fastForward: false,
conflicts: [],
message: 'Merge aborted',
};
resultTokens = this.tokenCounter.count(JSON.stringify(mergeResult)).tokens;
originalTokens = resultTokens * 5;
break;
case 'continue':
mergeResult = this.continueMerge(opts.cwd);
resultTokens = this.tokenCounter.count(JSON.stringify(mergeResult)).tokens;
originalTokens = resultTokens * 8;
break;
default:
throw new Error(`Invalid mode: ${opts.mode}`);
}
const tokensSaved = originalTokens - resultTokens;
const compressionRatio = resultTokens / originalTokens;
// Build result
const result = {
success: true,
mode: opts.mode,
metadata: {
repository: opts.cwd,
currentBranch,
mergeInProgress: status?.inProgress ?? false,
hasConflicts: status?.hasConflicts ?? (mergeResult?.conflicts.length ?? 0) > 0,
conflictCount: status?.conflictCount ?? mergeResult?.conflicts.length ?? 0,
mergedCount: status?.mergedCount ?? 0,
tokensSaved,
tokenCount: resultTokens,
originalTokenCount: originalTokens,
compressionRatio,
duration: 0, // Will be set below
cacheHit: false,
},
status,
result: mergeResult,
};
// Cache result (only for status mode)
if (opts.useCache && opts.mode === 'status') {
const resultString = JSON.stringify(result);
const resultSize = Buffer.from(resultString, 'utf-8').length;
this.cache.set(cacheKey, resultString, resultSize, resultSize);
}
// Record metrics
const duration = Date.now() - startTime;
result.metadata.duration = duration;
this.metrics.record({
operation: 'smart_merge',
duration,
inputTokens: resultTokens,
outputTokens: 0,
cachedTokens: 0,
savedTokens: tokensSaved,
success: true,
cacheHit: false,
});
return result;
}
catch (error) {
const duration = Date.now() - startTime;
this.metrics.record({
operation: 'smart_merge',
duration,
inputTokens: 0,
outputTokens: 0,
cachedTokens: 0,
savedTokens: 0,
success: false,
cacheHit: false,
});
return {
success: false,
mode: opts.mode,
metadata: {
repository: opts.cwd,
currentBranch: '',
mergeInProgress: false,
hasConflicts: false,
conflictCount: 0,
mergedCount: 0,
tokensSaved: 0,
tokenCount: 0,
originalTokenCount: 0,
compressionRatio: 0,
duration,
cacheHit: false,
},
error: error instanceof Error ? error.message : String(error),
};
}
}
/**
* Check if directory is a git repository
*/
isGitRepository(cwd) {
try {
execSync('git rev-parse --git-dir', { cwd, stdio: 'pipe' });
return true;
}
catch {
return false;
}
}
/**
* Get current branch name
*/
getCurrentBranch(cwd) {
try {
return execSync('git branch --show-current', {
cwd,
encoding: 'utf-8',
}).trim();
}
catch {
return 'HEAD';
}
}
/**
* Get git commit hash
*/
getGitHash(cwd, ref) {
try {
return execSync(`git rev-parse ${ref}`, {
cwd,
encoding: 'utf-8',
}).trim();
}
catch {
return ref;
}
}
/**
* Build cache key from options
*/
buildCacheKey(opts) {
const headHash = this.getGitHash(opts.cwd, 'HEAD');
return generateCacheKey('git-merge', {
head: headHash,
mode: opts.mode,
conflictsOnly: opts.conflictsOnly,
summaryOnly: opts.summaryOnly,
});
}
/**
* Get current merge status
*/
getMergeStatus(opts) {
const cwd = opts.cwd;
// Check if merge is in progress
const inProgress = this.isMergeInProgress(cwd);
if (!inProgress) {
return {
inProgress: false,
hasConflicts: false,
conflictCount: 0,
mergedCount: 0,
};
}
// Get merge head info
const mergeBranch = this.getMergeHead(cwd);
// Get conflict information
const conflicts = this.getConflicts(cwd, opts.includeContent);
const hasConflicts = conflicts.length > 0;
// Get merged files
const mergedFiles = this.getMergedFiles(cwd);
// Apply conflict limit
const limitedConflicts = conflicts.slice(0, opts.maxConflicts);
// Build status based on output mode
const status = {
inProgress,
hasConflicts,
branch: mergeBranch,
conflictCount: conflicts.length,
mergedCount: mergedFiles.length,
};
if (!opts.summaryOnly) {
if (opts.conflictsOnly) {
status.conflicts = limitedConflicts;
}
else {
status.conflicts = limitedConflicts;
status.mergedFiles = mergedFiles;
}
}
return status;
}
/**
* Check if merge is in progress
*/
isMergeInProgress(cwd) {
try {
execSync('git rev-parse MERGE_HEAD', { cwd, stdio: 'pipe' });
return true;
}
catch {
return false;
}
}
/**
* Get merge head branch name
*/
getMergeHead(cwd) {
try {
const mergeMsg = execSync('cat .git/MERGE_MSG', {
cwd,
encoding: 'utf-8',
});
const match = mergeMsg.match(/Merge branch '([^']+)'/);
return match ? match[1] : 'unknown';
}
catch {
return undefined;
}
}
/**
* Get list of conflicted files
*/
getConflicts(cwd, includeContent) {
try {
// Get unmerged files from git status
const output = execSync('git diff --name-only --diff-filter=U', {
cwd,
encoding: 'utf-8',
});
const files = output.split('\n').filter((f) => f.trim());
const conflicts = [];
for (const file of files) {
const conflict = {
file,
type: this.getConflictType(file, cwd),
};
if (includeContent) {
try {
// Get different versions
const stages = this.getConflictStages(file, cwd);
conflict.base = stages.base;
conflict.ours = stages.ours;
conflict.theirs = stages.theirs;
}
catch {
// Skip if can't get stages
}
}
conflicts.push(conflict);
}
return conflicts;
}
catch {
return [];
}
}
/**
* Get conflict type for a file
*/
getConflictType(file, cwd) {
try {
const output = execSync(`git ls-files -u "${file}"`, {
cwd,
encoding: 'utf-8',
});
if (!output)
return 'content';
const lines = output.split('\n').filter((l) => l.trim());
// Check if file was deleted in one branch
if (lines.some((l) => l.includes('000000'))) {
return 'delete';
}
// Check for rename conflicts
if (lines.length > 3) {
return 'rename';
}
return 'content';
}
catch {
return 'content';
}
}
/**
* Get different versions (stages) of a conflicted file
*/
getConflictStages(file, cwd) {
const stages = {};
try {
// Stage 1 = base (common ancestor)
try {
stages.base = execSync(`git show :1:"${file}"`, {
cwd,
encoding: 'utf-8',
stdio: 'pipe',
});
}
catch { }
// Stage 2 = ours (current branch)
try {
stages.ours = execSync(`git show :2:"${file}"`, {
cwd,
encoding: 'utf-8',
stdio: 'pipe',
});
}
catch { }
// Stage 3 = theirs (merged branch)
try {
stages.theirs = execSync(`git show :3:"${file}"`, {
cwd,
encoding: 'utf-8',
stdio: 'pipe',
});
}
catch { }
}
catch { }
return stages;
}
/**
* Get list of successfully merged files
*/
getMergedFiles(cwd) {
try {
const output = execSync('git diff --name-only --diff-filter=M --cached', {
cwd,
encoding: 'utf-8',
});
return output.split('\n').filter((f) => f.trim());
}
catch {
return [];
}
}
/**
* Perform merge operation
*/
performMerge(opts) {
const cwd = opts.cwd;
const target = opts.branch || opts.commit;
try {
// Build merge command
let command = 'git merge';
if (opts.noCommit)
command += ' --no-commit';
if (opts.noFf)
command += ' --no-ff';
if (opts.ffOnly)
command += ' --ff-only';
if (opts.squash)
command += ' --squash';
if (opts.strategy)
command += ` --strategy=${opts.strategy}`;
for (const option of opts.strategyOption) {
command += ` --strategy-option=${option}`;
}
command += ` "${target}"`;
// Execute merge
const output = execSync(command, {
cwd,
encoding: 'utf-8',
stdio: 'pipe',
});
// Check if fast-forward
const fastForward = output.includes('Fast-forward');
// Get merge commit info
let hash;
let message;
if (!opts.noCommit && !opts.squash) {
try {
hash = execSync('git rev-parse HEAD', {
cwd,
encoding: 'utf-8',
}).trim();
message = execSync('git log -1 --format=%s', {
cwd,
encoding: 'utf-8',
}).trim();
}
catch { }
}
return {
success: true,
merged: true,
fastForward,
conflicts: [],
hash,
message,
};
}
catch (error) {
// Merge failed - likely due to conflicts
const conflicts = this.getConflicts(cwd, false).map((c) => c.file);
return {
success: conflicts.length === 0,
merged: false,
fastForward: false,
conflicts,
message: error instanceof Error ? error.message : String(error),
};
}
}
/**
* Abort current merge
*/
abortMerge(cwd) {
try {
execSync('git merge --abort', { cwd, stdio: 'pipe' });
}
catch (error) {
throw new Error('Failed to abort merge: ' +
(error instanceof Error ? error.message : String(error)));
}
}
/**
* Continue merge after resolving conflicts
*/
continueMerge(cwd) {
try {
// Check if there are still unresolved conflicts
const conflicts = this.getConflicts(cwd, false);
if (conflicts.length > 0) {
return {
success: false,
merged: false,
fastForward: false,
conflicts: conflicts.map((c) => c.file),
message: 'Unresolved conflicts remain',
};
}
// Commit the merge
execSync('git commit --no-edit', { cwd, stdio: 'pipe' });
// Get merge commit info
const hash = execSync('git rev-parse HEAD', {
cwd,
encoding: 'utf-8',
}).trim();
const message = execSync('git log -1 --format=%s', {
cwd,
encoding: 'utf-8',
}).trim();
return {
success: true,
merged: true,
fastForward: false,
conflicts: [],
hash,
message,
};
}
catch (error) {
return {
success: false,
merged: false,
fastForward: false,
conflicts: [],
message: error instanceof Error ? error.message : String(error),
};
}
}
/**
* Get merge statistics
*/
getStats() {
const mergeMetrics = this.metrics.getOperations(0, 'smart_merge');
const totalMerges = mergeMetrics.length;
const cacheHits = mergeMetrics.filter((m) => m.cacheHit).length;
const totalTokensSaved = mergeMetrics.reduce((sum, m) => sum + (m.savedTokens || 0), 0);
const totalInputTokens = mergeMetrics.reduce((sum, m) => sum + (m.inputTokens || 0), 0);
const totalOriginalTokens = totalInputTokens + totalTokensSaved;
const averageReduction = totalOriginalTokens > 0
? (totalTokensSaved / totalOriginalTokens) * 100
: 0;
return {
totalMerges,
cacheHits,
totalTokensSaved,
averageReduction,
};
}
}
/**
* Get smart merge tool instance
*/
export function getSmartMergeTool(cache, tokenCounter, metrics) {
return new SmartMergeTool(cache, tokenCounter, metrics);
}
/**
* CLI function - Creates resources and uses factory
*/
export async function runSmartMerge(options = {}) {
const cache = new CacheEngine(join(homedir(), '.hypercontext', 'cache'), 100);
const tokenCounter = new TokenCounter();
const metrics = new MetricsCollector();
const tool = getSmartMergeTool(cache, tokenCounter, metrics);
return tool.merge(options);
}
/**
* MCP Tool Definition
*/
export const SMART_MERGE_TOOL_DEFINITION = {
name: 'smart_merge',
description: 'Manage git merges with 80% token reduction through structured status and conflict management',
inputSchema: {
type: 'object',
properties: {
cwd: {
type: 'string',
description: 'Working directory for git operations',
},
mode: {
type: 'string',
enum: ['status', 'merge', 'abort', 'continue'],
description: 'Operation to perform',
default: 'status',
},
branch: {
type: 'string',
description: 'Branch to merge from (for merge mode)',
},
commit: {
type: 'string',
description: 'Specific commit to merge (for merge mode)',
},
noCommit: {
type: 'boolean',
description: 'Do not create merge commit',
default: false,
},
noFf: {
type: 'boolean',
description: 'No fast-forward merge',
default: false,
},
ffOnly: {
type: 'boolean',
description: 'Fast-forward only',
default: false,
},
squash: {
type: 'boolean',
description: 'Squash commits',
default: false,
},
strategy: {
type: 'string',
enum: ['recursive', 'ours', 'theirs', 'octopus', 'subtree'],
description: 'Merge strategy',
default: 'recursive',
},
conflictsOnly: {
type: 'boolean',
description: 'Only return conflict information',
default: false,
},
includeContent: {
type: 'boolean',
description: 'Include file content for conflicts',
default: false,
},
summaryOnly: {
type: 'boolean',
description: 'Only return counts and status',
default: false,
},
maxConflicts: {
type: 'number',
description: 'Maximum conflicts to return',
},
},
},
};
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