1 files changed, 71 insertions, 0 deletions
diff --git a/fs/ensure_symlink.ts b/fs/ensure_symlink.ts
new file mode 100644
index 000000000..fbb89948e
--- /dev/null
+++ b/fs/ensure_symlink.ts
@@ -0,0 +1,71 @@
+// Copyright 2018-2019 the Deno authors. All rights reserved. MIT license.
+import * as path from "./path/mod.ts";
+import { ensureDir, ensureDirSync } from "./ensure_dir.ts";
+import { exists, existsSync } from "./exists.ts";
+import { PathType, getFileInfoType } from "./utils.ts";
+
+const isWindows = Deno.platform.os === "win";
+
+/**
+ * Ensures that the link exists.
+ * If the directory structure does not exist, it is created.
+ *
+ * @param src the source file path
+ * @param dest the destination link path
+ */
+export async function ensureSymlink(src: string, dest: string): Promise<void> {
+  const srcStatInfo = await Deno.lstat(src);
+  const srcFilePathType = getFileInfoType(srcStatInfo);
+
+  if (await exists(dest)) {
+    const destStatInfo = await Deno.lstat(dest);
+    const destFilePathType = getFileInfoType(destStatInfo);
+    if (destFilePathType !== PathType.symlink) {
+      throw new Error(
+        `Ensure path exists, expected 'symlink', got '${destFilePathType}'`
+      );
+    }
+    return;
+  }
+
+  await ensureDir(path.dirname(dest));
+
+  // TODO(axetroy): remove this if condition. refs: https://github.com/denoland/deno/issues/2169
+  if (isWindows) {
+    await Deno.symlink(src, dest, srcFilePathType || undefined);
+  } else {
+    await Deno.symlink(src, dest);
+  }
+}
+
+/**
+ * Ensures that the link exists.
+ * If the directory structure does not exist, it is created.
+ *
+ * @param src the source file path
+ * @param dest the destination link path
+ */
+export function ensureSymlinkSync(src: string, dest: string): void {
+  const srcStatInfo = Deno.lstatSync(src);
+  const srcFilePathType = getFileInfoType(srcStatInfo);
+
+  if (existsSync(dest)) {
+    const destStatInfo = Deno.lstatSync(dest);
+    const destFilePathType = getFileInfoType(destStatInfo);
+    if (destFilePathType !== PathType.symlink) {
+      throw new Error(
+        `Ensure path exists, expected 'symlink', got '${destFilePathType}'`
+      );
+    }
+    return;
+  }
+
+  ensureDirSync(path.dirname(dest));
+
+  // TODO(axetroy): remove this if condition. refs: https://github.com/denoland/deno/issues/2169
+  if (isWindows) {
+    Deno.symlinkSync(src, dest, srcFilePathType || undefined);
+  } else {
+    Deno.symlinkSync(src, dest);
+  }
+}