feat: add version flag support

Add --version (-v) flag to display package name and version.
Includes integration tests for both long and short flag variants.

Author: trevorbernard

src/main.rs

@@ -6,6 +6,10 @@ use std::io::{self, Write};
 #[derive(FromArgs)]
 /// Copy data to clipboard using OSC52 escape sequences
 struct Args {
+    #[argh(switch, short = 'v')]
+    /// show version information
+    version: bool,
+
     #[argh(positional)]
     /// file to copy (reads from stdin if not provided)
     file: Option<String>,
@@ -58,6 +62,11 @@ fn stream_to_clipboard_from_file(path: &str) -> io::Result<()> {
 fn main() -> io::Result<()> {
     let args: Args = argh::from_env();
 
+    if args.version {
+        println!("{} {}", env!("CARGO_PKG_NAME"), env!("CARGO_PKG_VERSION"));
+        return Ok(());
+    }
+
     if let Some(file_path) = &args.file {
         stream_to_clipboard_from_file(file_path)?;
     } else {

tests/integration_test.rs

@@ -0,0 +1,27 @@
+use std::process::Command;
+
+#[test]
+fn test_version_flag() {
+    let output = Command::new("cargo")
+        .args(&["run", "--", "--version"])
+        .output()
+        .expect("Failed to execute command");
+
+    assert!(output.status.success());
+    let stdout = String::from_utf8(output.stdout).expect("Invalid UTF-8");
+    let expected = format!("{} {}", env!("CARGO_PKG_NAME"), env!("CARGO_PKG_VERSION"));
+    assert_eq!(stdout.trim(), expected);
+}
+
+#[test]
+fn test_version_flag_short() {
+    let output = Command::new("cargo")
+        .args(&["run", "--", "-v"])
+        .output()
+        .expect("Failed to execute command");
+
+    assert!(output.status.success());
+    let stdout = String::from_utf8(output.stdout).expect("Invalid UTF-8");
+    let expected = format!("{} {}", env!("CARGO_PKG_NAME"), env!("CARGO_PKG_VERSION"));
+    assert_eq!(stdout.trim(), expected);
+}