adjusted argument handling and added a version option

README.md

@@ -5,12 +5,15 @@ A command line tool to generate CD, Office and OEM keys that use the mod7 algori
 I used [this blog post](https://gurney.dev/posts/mod7/) to figure out how these keys work and how to generate them
 
 # Usage
-`mod7-keygen {-cd | -office | -oem} <integer>`
+`mod7-keygen { --cd | --office | --oem } <integer>` or `mod7-keygen { -c | -e | -o } <integer>`
 - The integer is optional, it specifies the amount of keys to generate.
 
 `mod7-keygen --check <string>`
 - Checks if the provided key is valid.
 
+`mod7-keygen { --version | -v }`
+- Prints the version of the program
+
 # Building
 Make sure you have Rust and Git installed
 - `git clone https://github.com/Tresquel/mod7-keygen.git`

src/main.rs

@@ -33,7 +33,7 @@ fn main() {
             }
 
             match args[1].to_lowercase().as_str() {
-                "-cd" => {
+                "--cd" | "-c" => {
                     println!("Generated CD key(s): ");
                     for _ in 0..amount {
                         println!("{}", generator::cd());
@@ -42,7 +42,7 @@ fn main() {
                     return;
                 }
 
-                "-office" => {
+                "--office" | "-e" => {
                     println!("Generated Office key(s): ");
                     for _ in 0..amount {
                         println!("{}", generator::office());
@@ -51,7 +51,7 @@ fn main() {
                     return;
                 }
 
-                "-oem" => {
+                "--oem" | "-o" => {
                     println!("Generated OEM key(s): ");
                     for _ in 0..amount {
                         println!("{}", generator::oem());
@@ -77,10 +77,16 @@ fn main() {
 
                 }
 
-                "-help" => {
+                "--help" | "-h" => {
                     help();
                     return;
                 }
+
+                "--version" | "-v" => {
+                    println!("mod7-keygen version 1.1.0");
+                    return;
+                }
+
                 _ => {
                     eprintln!("Invalid argument(s)!");
                     help();
@@ -92,6 +98,7 @@ fn main() {
         _ => {
             eprintln!("Invalid argument(s)!");
             help();
+            return;
         }
     }
 }