print config options

gb-emu/src/main.rs

@@ -2,7 +2,7 @@
 
 #[cfg(feature = "camera")]
 use camera::Webcam;
-use clap::{ArgGroup, Parser, ValueEnum};
+use clap::{ArgGroup, Parser, Subcommand, ValueEnum};
 use debug::Debugger;
 use gb_emu_lib::{
     config::ConfigManager,
@@ -53,10 +53,14 @@ impl From<SerialTargetOption> for SerialTarget {
 #[derive(Parser, Debug)]
 #[command(author, version, about, long_about = None)]
 #[command(group(ArgGroup::new("saves").args(["save","no_save"])))]
+#[command(subcommand_negates_reqs = true)]
 struct Args {
+    #[command(subcommand)]
+    command: Option<Commands>,
+
     /// Path to ROM
-    #[arg(value_hint = clap::ValueHint::FilePath)]
+    #[arg(value_hint = clap::ValueHint::FilePath, required = true)]
-    rom: PathBuf,
+    rom: Option<PathBuf>,
 
     /// Save path
     #[arg(long, value_hint = clap::ValueHint::FilePath)]
@@ -93,6 +97,25 @@ struct Args {
     record: bool,
 }
 
+#[derive(Subcommand, Debug, Clone, Copy)]
+enum Commands {
+    PrintConfig {
+        /// Which config to print
+        #[arg(long, value_enum, default_value_t = ConfigType::Base)]
+        config: ConfigType,
+
+        /// Print current config instead of default
+        #[arg(long)]
+        current: bool,
+    },
+}
+
+#[derive(ValueEnum, Debug, Clone, Copy)]
+enum ConfigType {
+    Base,
+    Standalone,
+}
+
 #[derive(Debug, Serialize, Deserialize, Clone)]
 #[serde(default)]
 pub struct StandaloneConfig {
@@ -118,6 +141,7 @@ struct Configs {
 }
 
 static CONFIGS: OnceLock<Configs> = OnceLock::new();
+const CONFIG_NAME: &str = "standalone";
 
 fn access_config<'a>() -> &'a Configs {
     CONFIGS.get().expect("accessed config before it was set!")
@@ -126,10 +150,49 @@ fn access_config<'a>() -> &'a Configs {
 fn main() {
     let args = Args::parse();
 
-    run(args);
+    if let Some(subcommand) = args.command {
+        match subcommand {
+            Commands::PrintConfig { config, current } => {
+                if let Some(string) = if current {
+                    let config_manager =
+                        ConfigManager::get().expect("Could not open config folder");
+                    match config {
+                        ConfigType::Base => ConfigManager::get_custom_config_string(
+                            config_manager.load_or_create_base_config(),
+                        )
+                        .ok(),
+                        ConfigType::Standalone => config_manager
+                            .load_custom_config::<StandaloneConfig>(CONFIG_NAME)
+                            .and_then(|v| ConfigManager::get_custom_config_string(v).ok()),
+                    }
+                } else {
+                    match config {
+                        ConfigType::Base => ConfigManager::get_custom_config_string(
+                            gb_emu_lib::config::Config::default(),
+                        )
+                        .ok(),
+                        ConfigType::Standalone => {
+                            ConfigManager::get_custom_config_string(StandaloneConfig::default())
+                                .ok()
+                        }
+                    }
+                } {
+                    println!("{string}");
+                } else {
+                    println!("Error getting config string");
+                }
+            }
+        }
+    } else {
+        run(args);
+    }
 }
 
 fn run(args: Args) -> ! {
+    let rom = args
+        .rom
+        .expect("error with clap - this shouldn't be possible!");
+
     let (sender, receiver) = channel::<EmulatorMessage>();
 
     {
@@ -142,9 +205,9 @@ fn run(args: Args) -> ! {
 
     let config_manager = ConfigManager::get().expect("Could not open config folder");
     let config = config_manager.load_or_create_base_config();
-    let standalone_config: StandaloneConfig = config_manager.load_or_create_config("standalone");
+    let standalone_config: StandaloneConfig = config_manager.load_or_create_config(CONFIG_NAME);
 
-    let rom_file = RomFile::Path(args.rom);
+    let rom_file = RomFile::Path(rom);
 
     let (rom, camera) = rom_file
         .load(

lib/src/config/mod.rs

@@ -73,6 +73,13 @@ impl ConfigManager {
             Default::default(),
         )
     }
+
+    pub fn get_custom_config_string<C>(config: C) -> Result<String, ron::Error>
+    where
+        C: Serialize,
+    {
+        ron::ser::to_string_pretty(&config, Default::default())
+    }
 }
 
 #[derive(Debug, Serialize, Deserialize, Clone)]