✨ Add Cache (#1)

.gitignore

@@ -0,0 +1,4 @@
+.eslintcache
+.idea/
+lib/
+node_modules/

package.json

@@ -36,6 +36,7 @@
     "@typescript-eslint/eslint-plugin": "^2.31.0",
     "@typescript-eslint/parser": "^2.31.0",
     "@vuepress/shared-utils": "^1.4.1",
+    "cac": "6.5.5",
     "eslint": "^6.8.0",
     "eslint-config-airbnb-base": "^14.1.0",
     "eslint-plugin-import": "^2.20.2",
@@ -47,8 +48,7 @@
     "vue-router": "^3.1.6",
     "vuepress-types": "^0.9.1"
   },
-  "dependencies": {
-  },
+  "dependencies": {},
   "prettier": {
     "trailingComma": "all",
     "tabWidth": 2,

src/cache.ts

@@ -0,0 +1,40 @@
+import { readFileSync, writeFileSync } from 'fs';
+import { CacheData, CommitSHA, Contributor } from './types';
+
+export default class Cache {
+    cache: CacheData;
+
+    private readonly cachePath: string;
+
+    constructor(cachePath: string) {
+      this.cache = Cache.loadCache(cachePath);
+      this.cachePath = cachePath;
+    }
+
+    get(key: CommitSHA): Contributor | undefined {
+      return this.cache[key];
+    }
+
+    set(key: CommitSHA, value: Contributor): void {
+      this.cache[key] = { ...value, updatedAt: new Date() };
+    }
+
+    delete(key: CommitSHA): void {
+      delete this.cache[key];
+    }
+
+    saveCache(): void {
+      const data = JSON.stringify(this.cache);
+      writeFileSync(this.cachePath, data, { encoding: 'utf8' });
+    }
+
+    private static loadCache(cachePath: string): CacheData {
+      let file: string;
+      try {
+        file = readFileSync(cachePath, { encoding: 'utf8' });
+      } catch (e) {
+        file = '';
+      }
+      return file ? JSON.parse(file) : {};
+    }
+}

src/types.ts

@@ -0,0 +1,8 @@
+export interface Contributor {
+  name: string;
+  profileUrl: string;
+  profilePic?: string;
+  updatedAt?: Date;
+}
+export type CommitSHA = string;
+export type CacheData = Record<CommitSHA, Contributor>;