fix/feat: display version at start of all CLI contexts with empty line (#30)

* feat: display version at start of all CLI executions

- Add version output to normal file processing (not just --version/--help)
- Format: 'bbl_parser 0.9.0 <git_sha> (<date>)' via vergen
- Prints only when processing files (after help early exit)
- No duplicate printing: --version/--help handled by clap separately
- Resolves issue #29

* feat: display version at start of all CLI contexts with empty line

- Print version before get_matches() for all contexts
- Version shows for: -V, --version, --help, normal execution, no params
- Format: 'bbl_parser <semver> <sha> (<date>)' via vergen
- Empty line separates version from help/output
- Add custom -V/--version args with exclusive flag
- Early exit if only --version/-V requested
- Simple approach: print once at start, no duplication
- Resolves issue #29

Author: nerdCopter

src/main.rs

@@ -262,8 +262,15 @@ fn build_command() -> Command {
         "Read and parse BBL blackbox log files. Exports to CSV by default (optionally GPX/JSON).";
 
     Command::new(env!("CARGO_PKG_NAME"))
-        .version(VERSION_STR)
         .about(about_text)
+        .arg(
+            Arg::new("version")
+                .short('V')
+                .long("version")
+                .help("Print version")
+                .action(clap::ArgAction::SetTrue)
+                .exclusive(true),
+        )
         .arg(
             Arg::new("files")
                 .help("BBL files or directories to parse. Direct file paths: .BBL, .BFL, .TXT extensions supported. Directories: recursively finds .BBL/.BFL files only (TXT files must be specified directly). Case-insensitive, supports globbing.")
@@ -310,8 +317,17 @@ fn build_command() -> Command {
 }
 
 fn main() -> Result<()> {
+    // Print version at start of every execution context
+    println!("{} {}", env!("CARGO_PKG_NAME"), VERSION_STR);
+    println!();
+
     let matches = build_command().get_matches();
 
+    // Exit if only --version/-V requested
+    if matches.get_flag("version") {
+        return Ok(());
+    }
+
     let debug = matches.get_flag("debug");
     let export_gpx = matches.get_flag("gpx") || matches.get_flag("gps");
     let export_event = matches.get_flag("event");