From 327ec9c62f97d3bd828e3e3963cbda72aaed8067 Mon Sep 17 00:00:00 2001
From: Gregory Ballantine <gballantine@metaunix.net>
Date: Fri, 21 Oct 2022 00:16:25 -0400
Subject: [PATCH] Added Clap module for more advanced CLI command/argument
 handling

---
 Cargo.toml  |  1 +
 src/main.rs | 37 +++++++++++++++++++++++++++++++------
 2 files changed, 32 insertions(+), 6 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index edffc7a..bb2a8ce 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,6 +8,7 @@ license = "BSD 2-Clause"
 authors = ["Gregory Ballantine <gballantine@bitgoblin.tech>"]
 
 [dependencies]
+clap = { version = "4.0", features = ['derive'] }
 config = { version = "0.13", features = ['toml'] }
 log = "0.4"
 log4rs = "1.1"
diff --git a/src/main.rs b/src/main.rs
index a544455..2756268 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,4 @@
+use clap::{Parser, Subcommand};
 use log4rs;
 use config::Config;
 use transcoder::repository::Repository;
@@ -7,15 +8,39 @@ mod settings;
 mod transcoder;
 mod util;
 
+#[derive(Parser)]
+#[command(author, version, about, long_about = None)]
+struct Cli {
+  #[command(subcommand)]
+  command: Option<Commands>,
+}
+
+#[derive(Subcommand)]
+enum Commands {
+  /// displays version info about this program
+  ToDo {},
+}
+
 fn main() {
   // initialize the log4rs logger
   log4rs::init_file("./log4rs.yaml", Default::default()).unwrap();
 
-  // create and initialize our config and repository objects
-  let c: Config = settings::load_config();
-  let r: Repository = Repository::new(&shellexpand::tilde(&c.get_string("transcoder.repository").unwrap()));
+  // initialize the clap CLI
+  let cli = Cli::parse();
 
-  // create and start the video transcoder object
-  let t: Transcoder = Transcoder::new(c, r);
-  t.start();
+  match &cli.command {
+    // sub-commands will be handled here
+    Some(_) => todo!(),
+
+    // run the main program without any commands
+    None => {
+      // create and initialize our config and repository objects
+      let c: Config = settings::load_config();
+      let r: Repository = Repository::new(&shellexpand::tilde(&c.get_string("transcoder.repository").unwrap()));
+
+      // create and start the video transcoder object
+      let t: Transcoder = Transcoder::new(c, r);
+      t.start();
+    },
+  }
 }