Add manpage and completions output

CHANGELOG.md

@@ -8,6 +8,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 <!-- next-header -->
 
 ## [Unreleased] - ReleaseDate
+- Add manpage printing via `--print-manpage`
+- Add completions printing via `--print-completions`
 
 ## [1.2.1] - 2022-10-10
 - Enable multiple parallel decryptions to run in bruteforce [#414](https://github.com/svenstaro/genact/pull/414) (thanks @equal-l2)

Cargo.toml

@@ -38,7 +38,9 @@ sha2 = "0.10.6"
 yansi = "0.5"
 
 [target.'cfg(not(target_arch = "wasm32"))'.dependencies]
-clap = { version = "4.0", features = ["derive", "wrap_help"] }
+clap = { version = "4.0", features = ["derive", "cargo", "wrap_help"] }
+clap_complete = "4"
+clap_mangen = "0.2"
 ctrlc = { version = "3.2", features = ["termination"] }
 terminal_size = "0.2"
 

src/args.rs

@@ -44,6 +44,14 @@ pub struct AppConfig {
     /// Exit after running this many modules
     #[clap(long, value_parser = parse_min_1)]
     pub exit_after_modules: Option<u32>,
+
+    /// Generate completion file for a shell
+    #[clap(long = "print-completions", value_name = "shell")]
+    pub print_completions: Option<clap_complete::Shell>,
+
+    /// Generate man page
+    #[clap(long = "print-manpage")]
+    pub print_manpage: bool,
 }
 
 #[cfg(target_arch = "wasm32")]

src/main.rs

@@ -10,9 +10,27 @@ use genact::exit_handler;
 #[cfg(not(target_arch = "wasm32"))]
 #[async_std::main]
 async fn main() -> Result<()> {
+    use clap::CommandFactory;
+    use genact::args::AppConfig;
+
     yansi::Paint::enable_windows_ascii();
 
     let appconfig = parse_args();
+
+    if let Some(shell) = appconfig.print_completions {
+        let mut clap_app = AppConfig::command();
+        let app_name = clap_app.get_name().to_string();
+        clap_complete::generate(shell, &mut clap_app, app_name, &mut std::io::stdout());
+        return Ok(());
+    }
+
+    if appconfig.print_manpage {
+        let clap_app = AppConfig::command();
+        let man = clap_mangen::Man::new(clap_app);
+        man.render(&mut std::io::stdout())?;
+        return Ok(());
+    }
+
     *SPEED_FACTOR.lock().await = appconfig.speed_factor;
 
     if appconfig.list_modules_and_exit {