feat: autogenerating configs

Author: radstevee

src/config.rs

@@ -3,6 +3,7 @@ use std::{fs, io, path::{Path, PathBuf}};
 use proc_macros::serial_snake;
 
 #[serial_snake]
+#[derive(Default)]
 pub struct Config {
     java_8_home: String,
     java_16_home: String,
@@ -24,8 +25,7 @@ impl Config {
 
 pub fn read_config<P: AsRef<Path>>(path: P) -> io::Result<Config> {
     let content = fs::read_to_string(path)?;
-    match toml::from_str::<Config>(&content) {
-        Ok(c) => Ok(c),
-        Err(err) => Err(io::Error::new(io::ErrorKind::Other, err.to_string()))
-    }
+    toml::from_str::<Config>(&content).map_err(
+        |e| io::Error::new(io::ErrorKind::Other, e.to_string())
+    )
 }

src/main.rs

@@ -1,13 +1,15 @@
 use bin_patch_gen::build_tools::{
     download_buildtools, find_file, run_buildtools, VANILLA_JAR_REGEX,
 };
+use bin_patch_gen::config::Config;
 use bin_patch_gen::jar::extract_jar;
 use bin_patch_gen::util::dir::create_temp_dir;
 use bin_patch_gen::util::TimeFormatter;
 use bin_patch_gen::version::fetch_versions;
 use bin_patch_gen::{config, jar, prepare_extraction_path, write_patch, MinecraftVersion, JAR_VERSIONS_PATH};
 use regex::Regex;
-use std::path::Path;
+use std::fs;
+use std::path::{Path, PathBuf};
 use tracing::info;
 use tracing_subscriber::fmt::format;
 
@@ -20,6 +22,12 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
 
     tracing_subscriber::fmt().event_format(fmt).init();
 
+    let config_file = PathBuf::from("config.toml");
+    if !fs::exists(&config_file)? {
+        fs::write(config_file, toml::to_string_pretty(&Config::default())?)?;
+        info!("Generated default config file.")
+    }
+
     let config = config::read_config("config.toml")?;
 
     info!("Fetching versions...");