feat: implement path_remove_directory and path_unlink_file system cal…

…ls (#50)

feat: add path_remove_directory and path_unlink_file system calls

Signed-off-by: prakharagarwal1 <[email protected]>

src/fs_core.ts

@@ -122,6 +122,27 @@ export class Directory {
     return entry;
   }
 
+  get_parent_dir_for_path(path: string): Directory | null {
+    if (path === "") return null;
+    let entry: File | Directory | SyncOPFSFile = this;
+    let parentEntry: File | Directory | SyncOPFSFile = entry;
+    for (const component of path.split("/")) {
+      if (component === "") break;
+      if (component === ".") continue;
+      if (!(entry instanceof Directory)) {
+        debug.log(entry);
+        return null;
+      }
+      if (entry.contents[component] === undefined) {
+        debug.log(component);
+        return null;
+      }
+      parentEntry = entry;
+      entry = entry.contents[component];
+    }
+    return parentEntry;
+  }
+
   create_entry_for_path(
     path: string,
     is_dir: boolean,

src/fs_fd.ts

@@ -314,6 +314,56 @@ export class OpenDirectory extends Fd {
       0,
     ).ret;
   }
+
+  path_unlink_file(path: string): number {
+    path = this.clean_path(path);
+    const parentDirEntry = this.dir.get_parent_dir_for_path(path);
+    const pathComponents = path.split("/");
+    const fileName = pathComponents[pathComponents.length - 1];
+    const entry = this.dir.get_entry_for_path(path);
+    if (entry === null) {
+      return wasi.ERRNO_NOENT;
+    }
+    if (entry.stat().filetype === wasi.FILETYPE_DIRECTORY) {
+      return wasi.ERRNO_ISDIR;
+    }
+    delete parentDirEntry.contents[fileName];
+    return wasi.ERRNO_SUCCESS;
+  }
+
+  path_remove_directory(path: string): number {
+    path = this.clean_path(path);
+    const parentDirEntry = this.dir.get_parent_dir_for_path(path);
+    const pathComponents = path.split("/");
+    const fileName = pathComponents[pathComponents.length - 1];
+
+    const entry = this.dir.get_entry_for_path(path);
+
+    if (entry === null) {
+      return wasi.ERRNO_NOENT;
+    }
+    if (
+      !(entry instanceof Directory) ||
+      entry.stat().filetype !== wasi.FILETYPE_DIRECTORY
+    ) {
+      return wasi.ERRNO_NOTDIR;
+    }
+    if (Object.keys(entry.contents).length !== 0) {
+      return wasi.ERRNO_NOTEMPTY;
+    }
+    if (parentDirEntry.contents[fileName] === undefined) {
+      return wasi.ERRNO_NOENT;
+    }
+    delete parentDirEntry.contents[fileName];
+    return wasi.ERRNO_SUCCESS;
+  }
+
+  clean_path(path: string): string {
+    while (path.length > 0 && path[path.length - 1] === "/") {
+      path = path.slice(0, path.length - 1);
+    }
+    return path;
+  }
 }
 
 export class PreopenDirectory extends OpenDirectory {