refactor: extract git worktree parser from atlas hook

src/hooks/atlas/index.ts

@@ -1,5 +1,4 @@
 import type { PluginInput } from "@opencode-ai/plugin"
-import { execSync } from "node:child_process"
 import { existsSync, readdirSync } from "node:fs"
 import { join } from "node:path"
 import {
@@ -12,6 +11,7 @@ import { findNearestMessageWithFields, MESSAGE_STORAGE } from "../../features/ho
 import { log } from "../../shared/logger"
 import { createSystemDirective, SYSTEM_DIRECTIVE_PREFIX, SystemDirectiveTypes } from "../../shared/system-directive"
 import { isCallerOrchestrator, getMessageDir } from "../../shared/session-utils"
+import { collectGitDiffStats, formatFileChanges } from "../../shared/git-worktree"
 import type { BackgroundManager } from "../../features/background-agent"
 
 export const HOOK_NAME = "atlas"
@@ -269,113 +269,6 @@ function extractSessionIdFromOutput(output: string): string {
   return match?.[1] ?? "<session_id>"
 }
 
-interface GitFileStat {
-  path: string
-  added: number
-  removed: number
-  status: "modified" | "added" | "deleted"
-}
-
-function getGitDiffStats(directory: string): GitFileStat[] {
-  try {
-    const output = execSync("git diff --numstat HEAD", {
-      cwd: directory,
-      encoding: "utf-8",
-      timeout: 5000,
-      stdio: ["pipe", "pipe", "pipe"],
-    }).trim()
-
-    if (!output) return []
-
-    const statusOutput = execSync("git status --porcelain", {
-      cwd: directory,
-      encoding: "utf-8",
-      timeout: 5000,
-      stdio: ["pipe", "pipe", "pipe"],
-    }).trim()
-
-    const statusMap = new Map<string, "modified" | "added" | "deleted">()
-    for (const line of statusOutput.split("\n")) {
-      if (!line) continue
-      const status = line.substring(0, 2).trim()
-      const filePath = line.substring(3)
-      if (status === "A" || status === "??") {
-        statusMap.set(filePath, "added")
-      } else if (status === "D") {
-        statusMap.set(filePath, "deleted")
-      } else {
-        statusMap.set(filePath, "modified")
-      }
-    }
-
-    const stats: GitFileStat[] = []
-    for (const line of output.split("\n")) {
-      const parts = line.split("\t")
-      if (parts.length < 3) continue
-
-      const [addedStr, removedStr, path] = parts
-      const added = addedStr === "-" ? 0 : parseInt(addedStr, 10)
-      const removed = removedStr === "-" ? 0 : parseInt(removedStr, 10)
-
-      stats.push({
-        path,
-        added,
-        removed,
-        status: statusMap.get(path) ?? "modified",
-      })
-    }
-
-    return stats
-  } catch {
-    return []
-  }
-}
-
-function formatFileChanges(stats: GitFileStat[], notepadPath?: string): string {
-  if (stats.length === 0) return "[FILE CHANGES SUMMARY]\nNo file changes detected.\n"
-
-  const modified = stats.filter((s) => s.status === "modified")
-  const added = stats.filter((s) => s.status === "added")
-  const deleted = stats.filter((s) => s.status === "deleted")
-
-  const lines: string[] = ["[FILE CHANGES SUMMARY]"]
-
-  if (modified.length > 0) {
-    lines.push("Modified files:")
-    for (const f of modified) {
-      lines.push(`  ${f.path}  (+${f.added}, -${f.removed})`)
-    }
-    lines.push("")
-  }
-
-  if (added.length > 0) {
-    lines.push("Created files:")
-    for (const f of added) {
-      lines.push(`  ${f.path}  (+${f.added})`)
-    }
-    lines.push("")
-  }
-
-  if (deleted.length > 0) {
-    lines.push("Deleted files:")
-    for (const f of deleted) {
-      lines.push(`  ${f.path}  (-${f.removed})`)
-    }
-    lines.push("")
-  }
-
-  if (notepadPath) {
-    const notepadStat = stats.find((s) => s.path.includes("notepad") || s.path.includes(".sisyphus"))
-    if (notepadStat) {
-      lines.push("[NOTEPAD UPDATED]")
-      lines.push(`  ${notepadStat.path}  (+${notepadStat.added})`)
-      lines.push("")
-    }
-  }
-
-  return lines.join("\n")
-}
-
 interface ToolExecuteAfterInput {
   tool: string
   sessionID?: string
@@ -750,8 +643,8 @@ export function createAtlasHook(
       }
       
       if (output.output && typeof output.output === "string") {
-        const gitStats = getGitDiffStats(ctx.directory)
-        const fileChanges = formatFileChanges(gitStats)
+    const gitStats = collectGitDiffStats(ctx.directory)
+    const fileChanges = formatFileChanges(gitStats)
         const subagentSessionId = extractSessionIdFromOutput(output.output)
 
         const boulderState = readBoulderState(ctx.directory)