* Now shows help message when run without any arguments

* Also added instructions on SmartScreen warning

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "ddrescue_error_mapping"
 license = "AGPL-3.0-or-later"
-version = "0.5.2"
+version = "0.6.1"
 edition = "2021"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

README.md

@@ -18,7 +18,7 @@ Note the block device is the block device created with losetup. This command wil
 This will create a new device at `/dev/mapper/<device name>` which you can use with tools. Tested with DMDE (for faster recovery, set retries to 0), UFS Explorer and R-Studio
 
 ## Install
-ddr_error_mapping install binaries are available at [Releases](https://github.com/CKingX/ddrescue_error_mapping/releases) page for Windows and Linux binaries (x64 architecture only). I currently do not have a Mac to test ddr_error_mapping with, but building and running it should work regardless. (Note that ddr_error_mapping will only create the device mapping file. You still need Linux to create the device mapper block device!)
+ddr_error_mapping install binaries are available at [Releases](https://github.com/CKingX/ddrescue_error_mapping/releases) page for Windows and Linux binaries (x64 architecture only). I currently do not have a Mac to test ddr_error_mapping with, but building and running it should work regardless. (Note that ddr_error_mapping will only create the device mapping file. You still need Linux to create the device mapper block device!) On Windows, you will get SmartScreen warning. The reason is that Microsoft only trusts apps that have a lot of downloads which punishes niche or newer apps. To get around it, click More Info and now Run Anyway button will appear.
 
 ## Build Guide
 We can use cargo to build ddr_error_mapping. Currently tested with rustc version 1.60. To build, we first need to install rustup. For Windows, you can download rustup-init [here for Intel x64](https://static.rust-lang.org/rustup/dist/x86_64-pc-windows-msvc/rustup-init.exe) and [here for Intel 32-bit](https://static.rust-lang.org/rustup/dist/i686-pc-windows-msvc/rustup-init.exe). For Windows, it will offer to download build tools automatically. For Linux (make sure to install build tools like build-essentials on Ubuntu) and macOS (XCode commandline tools will be required), run this command below instead to install rustup:

src/main.rs

@@ -12,14 +12,18 @@ const PARSE_ERROR: &str = "Unable to parse ddrescue map file";
 
 fn main() {
     let args: Vec<String> = env::args().collect();
-    if args.iter().count() < 3 {
+    let arg_count = args.iter().count();
+    if arg_count < 3 {
         if let Some(arg) = args.iter().nth(1) {
             if arg.contains("--version") || arg.contains("-v") {
                 println!("{VERSION}");
             } else {
                 println!("{HELP}");
             }
         }
+        if arg_count == 1 {
+            println!("{HELP}");
+        }
         process::exit(0);
     }