fix(examples): rename prepare script alias, add commits.json (#46)

- rename `prepare` => `prep` to avoid autoexec during `yarn install`
- add getCommits() to retrieve commits for caching and
  write to `commits.json`
- commits.json stub file

examples/commit-table-ssr/commits.json

@@ -0,0 +1 @@
+[]

examples/commit-table-ssr/package.json

@@ -6,9 +6,9 @@
     "license": "Apache-2.0",
     "scripts": {
         "clean": "rm -rf .cache build out",
-        "prepare": "yarn clean && mkdir -p out && cp commits.json out",
+        "prep": "yarn clean && mkdir -p out && cp commits.json out",
         "build-static": "tsc && node build/server/static.js",
-        "build": "yarn prepare && parcel build index.html -d out --no-source-maps --no-cache --detailed-report --public-url ./",
+        "build": "yarn prep && parcel build index.html -d out --no-source-maps --no-cache --detailed-report --public-url ./",
         "start": "tsc && node build/server/index.js"
     },
     "devDependencies": {

examples/commit-table-ssr/src/server/index.ts

@@ -1,6 +1,7 @@
 import { TLRUCache } from "@thi.ng/cache";
 import * as express from "express";
 import * as Bundler from "parcel-bundler";
+import * as fs from "fs";
 
 import { Commit } from "../common/api";
 import { ctx } from "../common/config";
@@ -13,13 +14,18 @@ import { repoCommits } from "./git";
 const rawCache = new TLRUCache<string, Commit[]>(null, { ttl: 60 * 60 * 1000 });
 const htmlCache = new TLRUCache<string, string>(null, { ttl: 60 * 60 * 1000 });
 
-// console.log("parcel:", Object.keys(parcel));
 const bundler = new Bundler("index.html", {
     outDir: "./out",
     outFile: "index.html",
     publicUrl: "/out",
 });
 
+const getCommits = async () => {
+    const commits = [...repoCommits(ctx.repo.path)];
+    fs.writeFileSync("commits.json", JSON.stringify(commits));
+    return commits;
+};
+
 const app = express();
 
 // route for browser version
@@ -34,7 +40,7 @@ app.get("/commits", (_, res) => {
     // (re)create if missing...
     rawCache.getSet(
         ctx.repo.path,
-        async () => [...repoCommits(ctx.repo.path)]
+        getCommits
     ).then(
         (commits) => res.type("json").send(commits)
     )
@@ -50,7 +56,7 @@ app.get("/ssr", (_, res) => {
         async () => buildRepoTableHTML(
             await rawCache.getSet(
                 ctx.repo.path,
-                async () => [...repoCommits(ctx.repo.path)]
+                getCommits
             )
         )
     ).then((doc) => res.send(doc))