Update readme, add version command

1 files changed, 29 insertions, 2 deletions

diff --git a/src/main.rs b/src/main.rs
index c6201db..833c846 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -77,6 +77,10 @@ struct Arguments {
     image_type: ImageType,
 }
 
+fn print_help() {
+    println!("Usage: wmap [-t|--type IMAGE_TYPE] [-s|--stage STAGE] [-o|--output OUTPUT_FILE] INPUT_FILE");
+}
+
 fn parse_arguments() -> Result<Arguments, lexopt::Error> {
     use lexopt::prelude::*;
 
@@ -102,7 +106,12 @@ fn parse_arguments() -> Result<Arguments, lexopt::Error> {
                 input = Some(value.string()?);
             }
             Short('h') | Long("help") => {
-                println!("Usage: wmap [-t|--type=png|svg] [-o=OUTPUT_FILE] INPUT_FILE");
+                print_help();
+                std::process::exit(0);
+            }
+            Short('v') | Long("version") => {
+                let version = env!("CARGO_PKG_VERSION");
+                println!("{version}");
                 std::process::exit(0);
             }
             _ => return Err(argument.unexpected()),
@@ -123,7 +132,7 @@ fn parse_arguments() -> Result<Arguments, lexopt::Error> {
     })
 }
 
-fn main() -> IoResult<()> {
+fn run() -> IoResult<()> {
     let arguments = parse_arguments().map_err(|_| IoError::other("Unable to parse arguments"))?;
 
     arguments.input.try_exists()?;
@@ -141,3 +150,21 @@ fn main() -> IoResult<()> {
     write(arguments.output, image_data)?;
     Ok(())
 }
+
+fn main() -> IoResult<()> {
+    let result = run();
+
+    if cfg!(debug_assertions) {
+        result
+    } else {
+        match result {
+            Ok(()) => Ok(()),
+            Err(e) => {
+                eprintln!("Error: {e}");
+                eprintln!();
+                print_help();
+                std::process::exit(1);
+            }
+        }
+    }
+}