add gen manpage

CHANGELOG.md

@@ -8,6 +8,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 <!-- next-header -->
 
 ## [Unreleased]
+- added manpage
 
 ## [0.2.0] - 2022-03-09
 ### CLI

Cargo.lock

@@ -116,6 +116,16 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "clap_mangen"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0649fb4156bbd7306896025005596033879a2051f9a3aa7416ab915df1f8fdac"
+dependencies = [
+ "clap",
+ "roff",
+]
+
 [[package]]
 name = "colored"
 version = "2.0.0"
@@ -170,6 +180,7 @@ dependencies = [
  "better-panic",
  "clap",
  "clap_complete",
+ "clap_mangen",
  "colored",
  "ctrlc",
  "discord-rich-presence",
@@ -361,6 +372,12 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "roff"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b833d8d034ea094b1ea68aa6d5c740e0d04bad9d16568d08ba6f76823a114316"
+
 [[package]]
 name = "rustc-demangle"
 version = "0.1.21"

Cargo.toml

@@ -22,6 +22,7 @@ clap_complete = "3.1.1"
 colored = "2.0.0"
 discord-rich-presence = "0.2.0"
 ctrlc = "3.2.1"
+clap_mangen = "0.1.2"
 
 [dependencies.clap]
 version = "3.1.6"

src/cli/parse.rs

@@ -137,4 +137,10 @@ pub struct Cli {
         display_order = 14
     )]
     pub print_completions: Option<Shell>,
+
+    #[clap(
+        long = "print-manpage",
+        display_order = 15
+    )]
+    pub manpage: bool,
 }

src/main.rs

@@ -19,7 +19,7 @@ fn main() {
 
     let args = Cli::parse();
 
-    // * print_completions
+    // * print completions
     if let Some(shell) = args.print_completions {
         let mut clap_app = Cli::command();
         let app_name = clap_app.get_name().to_string();
@@ -28,6 +28,15 @@ fn main() {
         exit(0)
     }
 
+    // * print manpage
+    if args.manpage {
+        let clap_app = Cli::command();
+        let man = clap_mangen::Man::new(clap_app);
+
+        man.render(&mut io::stdout()).expect("generate manpage");
+        exit(0)
+    }
+
     // * start discord rpc
     execute::run(args.clone());