Allow configuration of font size

config.yaml

@@ -40,6 +40,9 @@ font:
   # Specify the monospaced font family to use
   # - Default is Iosevka Term and provided by this application
   family: Iosevka Term
+  # Specify the font size
+  # - Default is 13
+  size: 13
 
 # Settings applied by default to new buffers
 new_buffer:

data/src/config.rs

@@ -25,6 +25,7 @@ pub struct Config {
 #[derive(Debug, Clone, Default, Deserialize)]
 pub struct Font {
     pub family: Option<String>,
+    pub size: Option<u8>,
     // TODO: Do we make size, etc configurable and pass to Theme?
 }
 

src/main.rs

@@ -81,9 +81,16 @@ fn window_settings() -> iced::window::Settings {
 fn settings(
     config_load: Result<Config, config::Error>,
 ) -> iced::Settings<Result<Config, config::Error>> {
+    let default_text_size = config_load
+        .as_ref()
+        .ok()
+        .and_then(|config| config.font.size)
+        .map(f32::from)
+        .unwrap_or(theme::TEXT_SIZE);
+
     iced::Settings {
         default_font: font::MONO.clone().into(),
-        default_text_size: theme::TEXT_SIZE,
+        default_text_size,
         window: iced::window::Settings {
             ..window_settings()
         },

src/theme.rs

@@ -4,6 +4,8 @@ use iced::{application, Background, Color};
 
 use crate::widget::selectable_text;
 
+// TODO: If we use non-standard font sizes, we should consider
+// Config.font.size since it's user configurable
 pub const TEXT_SIZE: f32 = 13.0;
 pub const ICON_SIZE: f32 = 12.0;