feat: add --list-formats command, support auto-generated man pages

build.rs

@@ -16,6 +16,10 @@ use std::env;
 use std::fs;
 use std::path::Path;
 use std::process::Command;
+use clap::CommandFactory;
+
+#[path = "src/args.rs"]
+mod args;
 
 fn run_command(cmd: &str, args: &[&str]) -> Option<String> {
     let output = Command::new(cmd).args(args).output().ok()?;
@@ -104,4 +108,14 @@ fn main() {
 
     let version_path = Path::new(&out_dir).join("version.txt");
     fs::write(&version_path, &version_string).unwrap();
+
+    // Generate man page
+    let man_dir = Path::new("target").join("man");
+    fs::create_dir_all(&man_dir).unwrap();
+    let mut cmd = args::Args::command();
+    cmd = cmd.name("convertis").version(env!("CARGO_PKG_VERSION"));
+    let man = clap_mangen::Man::new(cmd);
+    let mut buffer: Vec<u8> = Default::default();
+    man.render(&mut buffer).unwrap();
+    fs::write(man_dir.join("convertis.1"), buffer).unwrap();
 }