added config file and deserialization

Cargo.toml

@@ -16,3 +16,5 @@ indexmap = "1.6.2"
 thiserror = "1.0.30"
 bitflags = "1.3.2"
 derivative = "2.2.0"
+serde = { version = "1.0", features = ["derive"] }
+toml = "0.5"

nowm.toml

@@ -0,0 +1,4 @@
+num_virtualscreens = 10
+mod_key = "Super"
+gap = 5
+kill_clients_on_exit = false

src/backends/window_event.rs

@@ -24,7 +24,9 @@ pub enum KeyState {
     Released,
 }
 
-#[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Clone, Copy)]
+#[derive(
+    Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Clone, Copy, serde::Deserialize,
+)]
 #[repr(u8)]
 pub enum ModifierKey {
     Shift,

src/main.rs

@@ -1,5 +1,7 @@
 #![allow(dead_code, unused_variables)]
 
+use std::io::Read;
+
 use log::{debug, error, info, trace, warn};
 use log4rs::{
     append::{console::ConsoleAppender, file::FileAppender},
@@ -67,8 +69,23 @@ fn main() {
 
     log_prologue();
 
-    state::WindowManager::<backends::xlib::XLib>::new(WMConfig::default())
-        .run();
+    let mut config_path = std::path::PathBuf::from(env!("HOME"));
+    config_path.push(".config/nowm.toml");
+
+    let config = std::fs::File::open(config_path)
+        .and_then(|mut file| {
+            let mut content = String::new();
+            file.read_to_string(&mut content)?;
+            Ok(content)
+        })
+        .and_then(|content| Ok(toml::from_str::<WMConfig>(&content)?))
+        .unwrap_or_else(|e| {
+            warn!("error parsing config file: {}", e);
+            info!("falling back to default config.");
+            WMConfig::default()
+        });
+
+    state::WindowManager::<backends::xlib::XLib>::new(config).run();
 }
 
 fn log_prologue() {

src/state.rs

@@ -22,10 +22,13 @@ use crate::{
     clients::{Client, ClientEntry, ClientKey, ClientState},
 };
 
+use serde::Deserialize;
+
 /**
 Contains static config data for the window manager, the sort of stuff you might want to
 be able to configure in a config file.
-*/
+ */
+#[derive(Debug, Deserialize)]
 pub struct WMConfig {
     num_virtualscreens: usize,
     mod_key: ModifierKey,