From 2926dcf46a1ca4245458fa8f68b0bb38881a3062 Mon Sep 17 00:00:00 2001
From: Martin Karkowski <m.karkowski@zema.de>
Date: Mon, 24 Aug 2020 09:36:46 +0200
Subject: [PATCH] adding helpers to handle uncreated dirs

---
 lib/helpers/fileHelpers.ts | 81 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100644 lib/helpers/fileHelpers.ts

diff --git a/lib/helpers/fileHelpers.ts b/lib/helpers/fileHelpers.ts
new file mode 100644
index 0000000..f1d77df
--- /dev/null
+++ b/lib/helpers/fileHelpers.ts
@@ -0,0 +1,81 @@
+import { type } from "os";
+import { mkdir, writeFile} from 'fs/promises'
+import { promisify } from "util";
+import { exists, BaseEncodingOptions, lstat } from "fs";
+
+const _exists = promisify(exists);
+const _lstat = promisify(lstat);
+
+/**
+ * Function to create a File
+ * @param fileName Read the File.
+ * @param content content which should be stored
+ * @param options The options to write the file. See original docu: https://nodejs.org/dist/latest-v8.x/docs/api/fs.html#fs_fs_writefile_file_data_options_callback
+ */
+export async function createFile(fileName: string, content: string, options?: (BaseEncodingOptions & { mode?: string | number; flag?: string | number; }) | "ascii" | "utf8" | "utf-8" | "utf16le" | "ucs2" | "ucs-2" | "base64" | "latin1" | "binary" | "hex") {
+    const FOLDER_SPLIT_CHAR = type() === 'Linux' ? '/' : '\\'
+    // Split the Path into different segements.
+    const pathParts = fileName.split(FOLDER_SPLIT_CHAR);
+    
+    // Pop the File.
+    pathParts.pop();
+
+    // Create the Path / Directories
+    await createPath(pathParts.join(FOLDER_SPLIT_CHAR))
+
+    // Wirte the File.
+    await writeFile(fileName, content, options)
+
+    return fileName;
+}
+
+/**
+ * Function to create a File
+ * @param path Read the File.
+ * @param content content which should be stored
+ * @param options The options to write the file. See original docu: https://nodejs.org/dist/latest-v8.x/docs/api/fs.html#fs_fs_writefile_file_data_options_callback
+ */
+export async function createPath(path: string) {
+    const FOLDER_SPLIT_CHAR = type() === 'Linux' ? '/' : '\\'
+    // Split the Path into different segements.
+    const pathParts = path.split(FOLDER_SPLIT_CHAR);
+
+
+    if (pathParts.length > 0) {
+        /** Check if the given Path Ends with a File Name */
+        if (pathParts[pathParts.length - 1].indexOf('.') !== -1) {
+            pathParts.pop();
+        }
+
+        // Reassemble the Segments like that:
+        //
+        // C:\\Test\\SubFolder\\AnotherFolder
+        // Split up:
+        // => fileParts = [C: , Test , SubFolder, AnotherFolder]
+        //
+        // Reassemble:
+        // 1) C:
+        // 2) C:\\Test
+        // 3) C:\\Test\\SubFolder
+        // 4) ...
+        //
+        // Everytime after an assembly Check whether the assembled
+        // path exists, otherwise create that folder and go on.       
+        
+        for (const [idx, folder] of pathParts.entries()) {
+            // Assemble the Path.
+            const currentPath = pathParts.slice(0, idx + 1).join(FOLDER_SPLIT_CHAR);
+            // Test and create the Folder
+            const urlExists = await _exists(currentPath);
+            // Test if the provided Path exists or not.
+            if (currentPath && !urlExists) {
+                await mkdir(currentPath);
+            } else if (currentPath && urlExists && (await _lstat(currentPath)).isFile()){
+
+                throw Error('Cant create File at the specified path. The given URL contains a File. See "' + currentPath +'"' );
+            }
+        }
+    }
+
+    return path;
+}
\ No newline at end of file