refactor: structure code to allow expanding cli functionality

src/cli/backup.rs

@@ -0,0 +1,12 @@
+use clap::{Args, Subcommand};
+
+#[derive(Subcommand)]
+pub enum BackupCommands {
+    List,
+}
+
+#[derive(Args)]
+pub struct BackupArgs {
+    #[command(subcommand)]
+    pub command: BackupCommands,
+}

src/cli/mod.rs

@@ -1,8 +1,23 @@
+mod backup;
+mod run;
+
+pub use backup::{BackupArgs, BackupCommands};
+pub use run::RunArgs;
+
 use crate::backup::ManagerConfig;
 use crate::server::ServerType;
-use clap::{Args, Parser, Subcommand};
+use clap::{Parser, Subcommand};
+use std::io;
 use std::path::PathBuf;
 
+#[derive(Subcommand)]
+pub enum Commands {
+    /// Run the server
+    Run(RunArgs),
+    /// Interact with the backup system without starting a server
+    Backup(BackupArgs),
+}
+
 #[derive(Parser)]
 #[command(author, version, about, long_about = None)]
 pub struct Cli {
@@ -36,7 +51,7 @@ pub struct Cli {
     )]
     pub backup: PathBuf,
 
-    /// What backup layers to employ, provided as a list of tuples name,frequency,chain_len,chains
+    /// What backup layers to employ, provided as a list of tuples name,frequency,chains,chain_len
     /// delimited by semicolons (;).
     #[arg(long, env = "ALEX_LAYERS", global = true, value_delimiter = ';')]
     pub layers: Vec<ManagerConfig>,
@@ -49,42 +64,11 @@ pub struct Cli {
     pub server_version: String,
 }
 
-#[derive(Subcommand)]
-pub enum Commands {
-    /// Run the server
-    Run(RunArgs),
-    /// Create a new backup of the server. This command should only be used when the server is not
-    /// running.
-    Backup(BackupArgs),
+impl Cli {
+    pub fn run(&self) -> io::Result<()> {
+        match &self.command {
+            Commands::Run(args) => args.run(self),
+            Commands::Backup(_) => Ok(()),
+        }
+    }
 }
-
-#[derive(Args)]
-pub struct RunArgs {
-    /// Server jar to execute
-    #[arg(
-        long,
-        value_name = "JAR_PATH",
-        default_value = "server.jar",
-        env = "ALEX_JAR"
-    )]
-    pub jar: PathBuf,
-
-    /// Java command to run the server jar with
-    #[arg(long, value_name = "JAVA_CMD", default_value_t = String::from("java"), env = "ALEX_JAVA")]
-    pub java: String,
-
-    /// XMS value in megabytes for the server instance
-    #[arg(long, default_value_t = 1024, env = "ALEX_XMS")]
-    pub xms: u64,
-    /// XMX value in megabytes for the server instance
-    #[arg(long, default_value_t = 2048, env = "ALEX_XMX")]
-    pub xmx: u64,
-
-    /// Don't actually run the server, but simply output the server configuration that would have
-    /// been ran
-    #[arg(short, long, default_value_t = false)]
-    pub dry: bool,
-}
-
-#[derive(Args)]
-pub struct BackupArgs {}

src/cli/run.rs

@@ -0,0 +1,94 @@
+use crate::cli::Cli;
+use crate::server;
+use crate::signals;
+use crate::stdin;
+use clap::Args;
+use std::io;
+use std::path::PathBuf;
+use std::sync::{Arc, Mutex};
+
+#[derive(Args)]
+pub struct RunArgs {
+    /// Server jar to execute
+    #[arg(
+        long,
+        value_name = "JAR_PATH",
+        default_value = "server.jar",
+        env = "ALEX_JAR"
+    )]
+    pub jar: PathBuf,
+
+    /// Java command to run the server jar with
+    #[arg(long, value_name = "JAVA_CMD", default_value_t = String::from("java"), env = "ALEX_JAVA")]
+    pub java: String,
+
+    /// XMS value in megabytes for the server instance
+    #[arg(long, default_value_t = 1024, env = "ALEX_XMS")]
+    pub xms: u64,
+    /// XMX value in megabytes for the server instance
+    #[arg(long, default_value_t = 2048, env = "ALEX_XMX")]
+    pub xmx: u64,
+
+    /// Don't actually run the server, but simply output the server configuration that would have
+    /// been ran
+    #[arg(short, long, default_value_t = false)]
+    pub dry: bool,
+}
+
+fn backups_thread(counter: Arc<Mutex<server::ServerProcess>>) {
+    loop {
+        let next_scheduled_time = {
+            let server = counter.lock().unwrap();
+            server.backups.next_scheduled_time().unwrap()
+        };
+
+        let now = chrono::offset::Utc::now();
+        if next_scheduled_time > now {
+            std::thread::sleep((next_scheduled_time - now).to_std().unwrap());
+        }
+
+        {
+            let mut server = counter.lock().unwrap();
+
+            // We explicitely ignore the error here, as we don't want the thread to fail
+            let _ = server.backup();
+        }
+    }
+}
+
+impl RunArgs {
+    pub fn run(&self, cli: &Cli) -> io::Result<()> {
+        let (_, mut signals) = signals::install_signal_handlers()?;
+
+        let mut cmd = server::ServerCommand::new(cli.server, &cli.server_version)
+            .java(&self.java)
+            .jar(self.jar.clone())
+            .config(cli.config.clone())
+            .world(cli.world.clone())
+            .backup(cli.backup.clone())
+            .managers(cli.layers.clone())
+            .xms(self.xms)
+            .xmx(self.xmx);
+        cmd.canonicalize()?;
+
+        if self.dry {
+            print!("{}", cmd);
+
+            return Ok(());
+        }
+
+        let counter = Arc::new(Mutex::new(cmd.spawn()?));
+
+        if !cli.layers.is_empty() {
+            let clone = Arc::clone(&counter);
+            std::thread::spawn(move || backups_thread(clone));
+        }
+
+        // Spawn thread that handles the main stdin loop
+        let clone = Arc::clone(&counter);
+        std::thread::spawn(move || stdin::handle_stdin(clone));
+
+        // Signal handler loop exits the process when necessary
+        signals::handle_signals(&mut signals, counter)
+    }
+}

src/main.rs

@@ -4,84 +4,31 @@ mod server;
 mod signals;
 mod stdin;
 
+use crate::cli::Cli;
 use clap::Parser;
-use cli::{Cli, Commands, RunArgs};
 use std::io;
-use std::sync::{Arc, Mutex};
 
-fn backups_thread(counter: Arc<Mutex<server::ServerProcess>>) {
-    loop {
-        let next_scheduled_time = {
-            let server = counter.lock().unwrap();
-            server.backups.next_scheduled_time().unwrap()
-        };
-
-        let now = chrono::offset::Utc::now();
-        if next_scheduled_time > now {
-            std::thread::sleep((next_scheduled_time - now).to_std().unwrap());
-        }
-
-        {
-            let mut server = counter.lock().unwrap();
-
-            // We explicitely ignore the error here, as we don't want the thread to fail
-            let _ = server.backup();
-        }
-    }
-}
-
-fn command_run(cli: &Cli, args: &RunArgs) -> io::Result<()> {
-    let (_, mut signals) = signals::install_signal_handlers()?;
-
-    let mut cmd = server::ServerCommand::new(cli.server, &cli.server_version)
-        .java(&args.java)
-        .jar(args.jar.clone())
-        .config(cli.config.clone())
-        .world(cli.world.clone())
-        .backup(cli.backup.clone())
-        .managers(cli.layers.clone())
-        .xms(args.xms)
-        .xmx(args.xmx);
-    cmd.canonicalize()?;
-
-    if args.dry {
-        print!("{}", cmd);
-
-        return Ok(());
-    }
-
-    let counter = Arc::new(Mutex::new(cmd.spawn()?));
-
-    if !cli.layers.is_empty() {
-        let clone = Arc::clone(&counter);
-        std::thread::spawn(move || backups_thread(clone));
-    }
-
-    // Spawn thread that handles the main stdin loop
-    let clone = Arc::clone(&counter);
-    std::thread::spawn(move || stdin::handle_stdin(clone));
-
-    // Signal handler loop exits the process when necessary
-    signals::handle_signals(&mut signals, counter)
-}
-
-// fn commands_backup(cli: &Cli, _args: &BackupArgs) -> io::Result<()> {
+// fn commands_backup(cli: &Cli, args: &BackupArgs) -> io::Result<()> {
 //     let metadata = server::Metadata {
 //         server_type: cli.server,
 //         server_version: cli.server_version.clone(),
 //     };
-//     let mut meta = MetaManager::new(cli.backup, cli.config, cli.world, metadata);
+//     let dirs = vec![
+//         (PathBuf::from("config"), cli.config.clone()),
+//         (PathBuf::from("worlds"), cli.world.clone()),
+//     ];
+//     let mut meta = MetaManager::new(cli.backup.clone(), dirs, metadata);
 //     meta.add_all(&cli.layers)?;
 
-//     manager.create_backup()?;
-//     manager.remove_old_backups()
+//     match &args.command {
+//         BackupCommands::List => ()
+//     }
+
+//     // manager.create_backup()?;
+//     // manager.remove_old_backups()
 // }
 
 fn main() -> io::Result<()> {
     let cli = Cli::parse();
-
-    match &cli.command {
-        Commands::Run(args) => command_run(&cli, args),
-        Commands::Backup(_) => Ok(()),
-    }
+    cli.run()
 }