add support for caching

src/cache-distributions/cache-factory.ts

@@ -0,0 +1,22 @@
+import PipCache from './pip-cache';
+import PipenvCache from './pipenv-cache';
+
+export enum PackageManagers {
+  Pip = 'pip',
+  Pipenv = 'pipenv'
+}
+
+export async function getCacheDistributor(
+  packageManager: string,
+  pythonVersion: string,
+  patterns: string | undefined
+) {
+  switch (packageManager) {
+    case PackageManagers.Pip:
+      return new PipCache(patterns);
+    case PackageManagers.Pipenv:
+      return new PipenvCache(pythonVersion, patterns);
+    default:
+      throw new Error(`Caching for '${packageManager}' is not supported`);
+  }
+}