feat: Initial support for custom user-defined themes

src/utils.rs

@@ -21,6 +21,7 @@ use tokio_util::sync::CancellationToken;
 use crate::app::{log_and_print_error, App, AppConfig};
 use crate::cli::{self, Command};
 use crate::network::Network;
+use crate::ui::theme::ThemeDefinition;
 
 #[cfg(test)]
 #[path = "utils_tests.rs"]
@@ -140,10 +141,31 @@ fn colorize_log_line(line: &str, re: &Regex) -> String {
 }
 
 pub(super) fn load_config(path: &str) -> Result<AppConfig> {
-  let file = File::open(path).map_err(|e| anyhow!(e))?;
-  let reader = BufReader::new(file);
-  let config = serde_yaml::from_reader(reader)?;
-  Ok(config)
+  match File::open(path).map_err(|e| anyhow!(e)) {
+    Ok(file) => {
+      let reader = BufReader::new(file);
+      let config = serde_yaml::from_reader(reader)?;
+      Ok(config)
+    }
+    Err(e) => {
+      log_and_print_error(format!("Unable to open config file: {e:?}"));
+      process::exit(1);
+    }
+  }
+}
+
+pub(super) fn load_theme_config(path: &str) -> Result<Vec<ThemeDefinition>> {
+  match File::open(path).map_err(|e| anyhow!(e)) {
+    Ok(file) => {
+      let reader = BufReader::new(file);
+      let theme_config = serde_yaml::from_reader(reader)?;
+      Ok(theme_config)
+    }
+    Err(e) => {
+      log_and_print_error(format!("Unable to open theme file: {e:?}"));
+      process::exit(1);
+    }
+  }
 }
 
 pub(super) fn build_network_client(config: &AppConfig) -> Client {