First one-shot pass

src/config.rs

@@ -0,0 +1,82 @@
+use std::fs;
+use std::path::PathBuf;
+
+use anyhow::Result;
+use serde::{Deserialize, Serialize};
+
+#[derive(Clone, Debug, Serialize, Deserialize)]
+pub struct Config {
+    #[serde(default = "default_target_wpm")]
+    pub target_wpm: u32,
+    #[serde(default = "default_theme")]
+    pub theme: String,
+    #[serde(default = "default_keyboard_layout")]
+    pub keyboard_layout: String,
+    #[serde(default = "default_code_languages")]
+    pub code_languages: Vec<String>,
+    #[serde(default = "default_word_count")]
+    pub word_count: usize,
+}
+
+fn default_target_wpm() -> u32 {
+    35
+}
+fn default_theme() -> String {
+    "catppuccin-mocha".to_string()
+}
+fn default_keyboard_layout() -> String {
+    "qwerty".to_string()
+}
+fn default_code_languages() -> Vec<String> {
+    vec!["rust".to_string()]
+}
+fn default_word_count() -> usize {
+    20
+}
+
+impl Default for Config {
+    fn default() -> Self {
+        Self {
+            target_wpm: default_target_wpm(),
+            theme: default_theme(),
+            keyboard_layout: default_keyboard_layout(),
+            code_languages: default_code_languages(),
+            word_count: default_word_count(),
+        }
+    }
+}
+
+impl Config {
+    pub fn load() -> Result<Self> {
+        let path = Self::config_path();
+        if path.exists() {
+            let content = fs::read_to_string(&path)?;
+            let config: Config = toml::from_str(&content)?;
+            Ok(config)
+        } else {
+            Ok(Config::default())
+        }
+    }
+
+    #[allow(dead_code)]
+    pub fn save(&self) -> Result<()> {
+        let path = Self::config_path();
+        if let Some(parent) = path.parent() {
+            fs::create_dir_all(parent)?;
+        }
+        let content = toml::to_string_pretty(self)?;
+        fs::write(&path, content)?;
+        Ok(())
+    }
+
+    fn config_path() -> PathBuf {
+        dirs::config_dir()
+            .unwrap_or_else(|| PathBuf::from("."))
+            .join("keydr")
+            .join("config.toml")
+    }
+
+    pub fn target_cpm(&self) -> f64 {
+        self.target_wpm as f64 * 5.0
+    }
+}