feat: 配置加载模块

src/core/config.ts

@@ -0,0 +1,66 @@
+import { existsSync } from "node:fs";
+import { readFile } from "node:fs/promises";
+import { join, dirname } from "node:path";
+import { parse as parseYaml } from "yaml";
+import { defaultConfig } from "../defaults/config.ts";
+import type { RuneConfig } from "../types.ts";
+import { RUNE_DIR, CONFIG_FILE, CHANGES_DIR, ARCHIVE_DIR } from "../types.ts";
+
+export function findProjectRoot(
+  startDir: string = process.cwd(),
+): string | null {
+  let dir = startDir;
+  while (true) {
+    if (existsSync(join(dir, RUNE_DIR))) {
+      return dir;
+    }
+    const parent = dirname(dir);
+    if (parent === dir) return null;
+    dir = parent;
+  }
+}
+
+export async function loadConfig(projectRoot: string): Promise<RuneConfig> {
+  const configPath = join(projectRoot, RUNE_DIR, CONFIG_FILE);
+  try {
+    const content = await readFile(configPath, "utf-8");
+    const userConfig = parseYaml(content) as Partial<RuneConfig> | null;
+    if (!userConfig?.stages) {
+      return structuredClone(defaultConfig);
+    }
+    return mergeConfig(userConfig);
+  } catch {
+    return structuredClone(defaultConfig);
+  }
+}
+
+function mergeConfig(userConfig: Partial<RuneConfig>): RuneConfig {
+  const result: RuneConfig = { stages: {} };
+  const stageKeys = ["discuss", "plan", "build", "archive"] as const;
+
+  for (const stage of stageKeys) {
+    if (userConfig.stages?.[stage]) {
+      result.stages[stage] = userConfig.stages[stage]!;
+    } else if (defaultConfig.stages[stage]) {
+      result.stages[stage] = structuredClone(defaultConfig.stages[stage]!);
+    }
+  }
+
+  return result;
+}
+
+export function getRuneDir(projectRoot: string): string {
+  return join(projectRoot, RUNE_DIR);
+}
+
+export function getChangesDir(projectRoot: string): string {
+  return join(projectRoot, RUNE_DIR, CHANGES_DIR);
+}
+
+export function getArchiveDir(projectRoot: string): string {
+  return join(projectRoot, RUNE_DIR, ARCHIVE_DIR);
+}
+
+export function getChangeDir(projectRoot: string, changeName: string): string {
+  return join(projectRoot, RUNE_DIR, CHANGES_DIR, changeName);
+}