refactored the project using the clap crate

src/app/commands/install_reveal.rs

@@ -0,0 +1,26 @@
+use std::{fs::File, io::Write};
+
+use crate::app::fs_util;
+
+const ASCIIDOC_REVEAL_VERSION: &str= "v4.1.0-rc.5";
+
+pub fn install_reveal() -> () {
+    let result = reqwest::blocking::get(url())
+        .expect("Could not download reveal. Make sure you are connected to the internet");
+
+    let binary = result.bytes().expect("could not get binary");
+
+    let home_path = home::home_dir().expect("could not find home dir");
+    let save_path = format!("{}/.docki/asciidoctor-revealjs", home_path.display());
+    let save_dir = format!("{}/.docki", home_path.display());
+
+    fs_util::create_dir_recursive(save_dir.as_str());
+
+    let mut file = File::create(save_path).expect("could not save binary");
+    file.write_all(&binary).expect("could not save binary");
+}
+
+fn url() -> String {
+    return format!("https://github.com/asciidoctor/asciidoctor-reveal.js/releases/download/{}/asciidoctor-revealjs-linux", ASCIIDOC_REVEAL_VERSION);
+}
+