From bdb4159f5bc92f11ffcd10ff4f2649b090d63cee Mon Sep 17 00:00:00 2001
From: Zef Hemel <zef@zef.me>
Date: Tue, 21 Nov 2023 12:05:17 +0100
Subject: [PATCH] Fixes #518

---
 plugos/syscalls/fs.deno.ts | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/plugos/syscalls/fs.deno.ts b/plugos/syscalls/fs.deno.ts
index 5c419e0c..4c5eb3a7 100644
--- a/plugos/syscalls/fs.deno.ts
+++ b/plugos/syscalls/fs.deno.ts
@@ -78,7 +78,11 @@ export default function fileSystemSyscalls(root = "/"): SysCallMapping {
         const file of walk(dirPath, {
           includeDirs: false,
           // Exclude hidden files
-          skip: [/^.*\/\..+$/],
+          skip: [
+            // Dynamically builds a regexp that matches hidden directories INSIDE the rootPath
+            // (but if the rootPath is hidden, it stil lists files inside of it, fixing #130 and #518)
+            new RegExp(`^${escapeRegExp(root)}.*\\/\\..+$`),
+          ],
           maxDepth: recursive ? Infinity : 1,
         })
       ) {
@@ -97,3 +101,7 @@ export default function fileSystemSyscalls(root = "/"): SysCallMapping {
     },
   };
 }
+
+function escapeRegExp(string: string) {
+  return string.replace(/[.*+?^${}()|[\]\\]/g, "\\$&"); // $& means the whole matched string
+}