refactor directory structure and modularize a few common functions

lib/install.js

@@ -0,0 +1,57 @@
+import path from "path";
+import fs from "fs";
+import downloader from "careful-downloader";
+import logSymbols from "log-symbols";
+import { getPkgVersion, getReleaseUrl, getReleaseFilename, getBinFilename, getBinVersion, getChecksumFilename, isExtended } from "./utils.js";
+
+installHugo()
+  .then((bin) =>
+    // try querying hugo's version via CLI
+     getBinVersion(bin),
+  )
+  .then((version) => {
+    // print output of `hugo version` to console
+    console.log(`${logSymbols.success} Hugo installed successfully!`);
+    console.log(version);
+  })
+  .catch((error) => {
+    // pass whatever error occured along the way to console
+    console.error(`${logSymbols.error} Hugo installation failed. :(`);
+    throw error;
+  });
+
+async function installHugo() {
+  const version = getPkgVersion();
+  const releaseFile = getReleaseFilename(version);
+  const checksumFile = getChecksumFilename(version);
+  const binFile = getBinFilename();
+
+  // stop here if there's nothing we can download
+  if (!releaseFile) {
+    throw new Error(`Are you sure this platform is supported? See: https://github.com/gohugoio/hugo/releases/tag/v${version}`);
+  }
+
+  // warn if platform doesn't support Hugo Extended, proceed with vanilla Hugo
+  if (!isExtended(releaseFile)) {
+    console.warn(`${logSymbols.info} Hugo Extended isn't supported on this platform, downloading vanilla Hugo instead.`);
+  }
+
+  const download = await downloader(
+    getReleaseUrl(version, releaseFile),
+    getReleaseUrl(version, checksumFile),
+    {
+      filename: releaseFile,
+      destDir: "vendor",
+      cleanDestDir: false,
+      algorithm: "sha256",
+      encoding: "binary",
+      extract: true,
+    },
+  );
+
+  // ensure hugo[.exe] is executable
+  fs.chmodSync(path.join(download, binFile), 0o755);
+
+  // return the full path to our Hugo binary
+  return path.join(download, binFile);
+}