Add a makeIndex utility

Author: billiegoose

src/__tests__/CacheFS.spec.js

@@ -0,0 +1,13 @@
+import CacheFS from "../CacheFS";
+
+const fs = new CacheFS();
+
+const treeText = require('./__fixtures__/tree.txt.js');
+
+describe("CacheFS module", () => {
+  it("print ∘ parse == id", () => {
+    let parsed = fs.parse(treeText)
+    let text = fs.print(parsed)
+    expect(text).toEqual(treeText)
+  });
+});

src/__tests__/__fixtures__/tree.txt renamed to src/__tests__/__fixtures__/tree.txt.js

@@ -1,4 +1,4 @@
-.git	777
+module.exports = `.git	777
 	hooks	777
 	info	777
 	objects	777
@@ -1765,4 +1765,4 @@ package.json	666	3996	1545535032598
 renovate.json	666	244	1545535032598
 rollup.config.js	666	804	1545535032598
 tsconfig.json	666	581	1545535032598
-webpack.config.js	666	1730	1545535032599
+webpack.config.js	666	1730	1545535032599`

src/makeIndex.js

@@ -0,0 +1,35 @@
+var fs = require('fs')
+var path = require('path')
+var symLinks = {}
+
+module.exports = (dirpath) => {
+  let str = "";
+  const printTree = (root, indent) => {
+    let files = fs.readdirSync(root)
+    for (let file of files) {
+      let fpath = `${root}/${file}`
+      let lstat = fs.lstatSync(fpath)
+      // Avoid infinite loops.
+      if (lstat.isSymbolicLink()) {
+        if (!symLinks[lstat.dev]) {
+          symLinks[lstat.dev] = {}
+        }
+        // Skip this entry if we've seen it before
+        if (symLinks[lstat.dev][lstat.ino]) {
+          continue
+        }
+        symLinks[lstat.dev][lstat.ino] = true
+      }
+      let mode = lstat.mode.toString(8);
+      str += `\n${"\t".repeat(indent)}`
+      if (lstat.isDirectory()) {
+        str += `${file}\t${mode}`;
+        printTree(fpath, indent + 1);
+      } else {
+        str += `${file}\t${mode}\t${lstat.size}\t${lstat.mtimeMs}`;
+      }
+    }
+  };
+  printTree(dirpath, 0);
+  return str.trimStart();
+}