refactor for cross platform use

src/util.ts

@@ -0,0 +1,39 @@
+import * as glob from 'glob';
+import { lstatSync } from 'fs';
+
+export interface Config {
+    github_token: string,
+    github_ref: string,
+    github_repository: string,
+    // user provided
+    input_name?: string,
+    input_body?: string,
+    input_body_path?: string,
+    input_files?: string[],
+    input_draft?: boolean,
+}
+
+type Env = { [key: string]: string | undefined };
+
+export const parseConfig = (env: Env): Config => {
+  return {
+    github_token: env.GITHUB_TOKEN || "",
+    github_ref: (env.GITHUB_REF || ""),
+    github_repository: env.GITHUB_REPOSITORY || "",
+    input_name: env.INPUT_NAME,
+    input_body: env.INPUT_BODY,
+    input_body_path: env.INPUT_BODY_PATH,
+    input_files: (env.INPUT_FILES || "").split(","),
+    input_draft: env.INPUT_DRAFT === 'true'
+  }
+}
+
+export const paths = (patterns: string[]): string[] => {
+  return patterns.reduce((acc: string[], pattern: string): string[] => {
+    return acc.concat(glob.sync(pattern).filter(path => lstatSync(path).isFile()));
+  }, [])
+}
+
+export const isTag = (ref: string): boolean => {
+  return ref.startsWith("refs/tags/")
+}