feature: Create command system to handle actions

src/main.rs

@@ -1,5 +1,5 @@
-use clap::Parser;
-use readwise_bulk_upload::config::Config;
+use clap::{CommandFactory, Parser};
+use readwise_bulk_upload::config::{Command, Config};
 use readwise_bulk_upload::readwise::DocumentPayload;
 use readwise_bulk_upload::sql::TaskManager;
 use readwise_bulk_upload::{Error, Result};
@@ -9,8 +9,9 @@ use figment::{Figment, providers::{Serialized, Env}};
 
 #[tokio::main]
 async fn main() -> Result<()> {
+    let cli = Config::parse();
     let args: Config = Figment::new()
-        .merge(Serialized::defaults(Config::parse()))
+        .merge(Serialized::defaults(&cli))
         .merge(Env::prefixed("APP_"))
         .extract()?;
 
@@ -18,18 +19,32 @@ async fn main() -> Result<()> {
         .with_max_level(args.log_level())
         .init();
 
-    let file = File::open(args.path()).map_err(|_| {
-        Error::Runtime(format!(
-            r#"The file "{}" could not be open"#,
-            args.path().display()
-        ))
-    })?;
-
-    let documents: Vec<DocumentPayload> = serde_json::from_reader(file)?;
-
-    let task_manager = TaskManager::new().await?;
-
-    task_manager.load_tasks(documents).await?;
+    run(&cli.command).await?;
+
+    Ok(())
+}
+
+async fn run(command: &Command) -> Result<()> {
+
+    match command {
+        Command::LoadTasks { path } => {
+            let file = File::open(path).map_err(|_| {
+                Error::Runtime(format!(
+                    r#"The file "{}" could not be open"#,
+                    path.display()
+                ))
+            })?;
+
+            let documents: Vec<DocumentPayload> = serde_json::from_reader(file)?;
+
+            let task_manager = TaskManager::new().await?;
+
+            task_manager.load_tasks(documents).await?;
+        }
+        Command::None => {
+            Config::command().print_help()?;
+        }
+    }
 
     Ok(())
 }