From 1b18401ad9acc6f2fe6625b5cbb9b2b8f162536a Mon Sep 17 00:00:00 2001
From: Jesse Luehrs <doy@tozt.net>
Date: Wed, 7 Nov 2018 20:34:42 -0500
Subject: factor out into subcommands

---
 src/cli.rs | 55 +++++++++++++++++++++++++++++++++++++++----------------
 1 file changed, 39 insertions(+), 16 deletions(-)

(limited to 'src/cli.rs')

diff --git a/src/cli.rs b/src/cli.rs
index 4e1d7cb..27b2742 100644
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -1,28 +1,51 @@
 use clap;
+use failure;
 
 const _DUMMY_DEPENDENCY: &'static str = include_str!("../Cargo.toml");
 
+pub enum Command {
+    Sync,
+}
+
 pub struct Options {
-    pub username: String,
-    pub api_key: String,
+    pub command: Command,
+    pub username: Option<String>,
+    pub api_key: Option<String>,
 }
 
-pub fn get_options() -> Options {
+pub fn get_options() -> failure::Fallible<Options> {
     let matches = app_from_crate!()
-        .arg(
-            clap::Arg::with_name("username")
-                .required(true)
-                .help("last.fm username to fetch tracks for")
-        )
-        .arg(
-            clap::Arg::with_name("api_key")
-                .required(true)
-                .help("last.fm api key")
+        .subcommand(
+            clap::SubCommand::with_name("sync")
+                .about("Updates the local copy of track data from last.fm")
+                .arg(
+                    clap::Arg::with_name("username")
+                        .short("u")
+                        .long("username")
+                        .value_name("USERNAME")
+                        .required(true)
+                        .help("last.fm username to fetch tracks for")
+                )
+                .arg(
+                    clap::Arg::with_name("api-key")
+                        .short("k")
+                        .long("api-key")
+                        .value_name("API_KEY")
+                        .required(true)
+                        .help("last.fm api key")
+                )
         )
         .get_matches();
 
-    Options {
-        username: matches.value_of("username").unwrap().to_string(),
-        api_key: matches.value_of("api_key").unwrap().to_string(),
-    }
+    let (command, sub_matches) = match matches.subcommand() {
+        ("sync", Some(matches)) => (Command::Sync, matches),
+        (name, Some(_)) => bail!("unknown subcommand: {}", name),
+        (_, None) => bail!("no subcommand given"),
+    };
+
+    Ok(Options {
+        command: command,
+        username: sub_matches.value_of("username").map(|s| s.to_string()),
+        api_key: sub_matches.value_of("api-key").map(|s| s.to_string()),
+    })
 }
-- 
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