neovim-gtk/src/settings.rs

#[cfg(target_os = "unix")]
use ui::UI;
use ui::Ui;
#[cfg(target_os = "unix")]
use gio;

#[derive(PartialEq)]
pub enum FontSource {
    Rpc,
    Gnome,
    Default,
}


pub struct Settings {
    font_source: FontSource,

    #[cfg(target_os = "unix")]
    gnome_interface_settings: gio::Settings,
}

impl Settings {

    #[cfg(target_os = "unix")]
    pub fn new() -> Settings {
        Settings { 
            font_source: FontSource::Default,
            gnome_interface_settings: gio::Settings::new("org.gnome.desktop.interface"),
        }
    }

    #[cfg(target_os = "windows")]
    pub fn new() -> Settings {
        Settings { 
            font_source: FontSource::Default,
        }
    }

    #[cfg(target_os = "unix")]
    pub fn init(&mut self, ui: &mut Ui) {
        self.gnome_interface_settings.connect_changed(|_, _| monospace_font_changed());
        self.update_font(ui);
    }

    #[cfg(target_os = "windows")]
    pub fn init(&mut self, ui: &mut Ui) {
        
    }

    #[cfg(target_os = "windows")]
    fn update_font(&mut self, ui: &mut Ui) {
    }

    #[cfg(target_os = "unix")]
    fn update_font(&mut self, ui: &mut Ui) {
        // rpc is priority for font
        if self.font_source == FontSource::Rpc {
            return;
        }

       if let Some(ref font_name) = self.gnome_interface_settings.get_string("monospace-font-name") {
           ui.set_font_desc(font_name);
           self.font_source = FontSource::Gnome;
       }
    }

    pub fn set_font_source(&mut self, src: FontSource) {
        self.font_source = src;
    }
}

#[cfg(target_os = "unix")]
fn monospace_font_changed() {
    UI.with(|ui_cell| {
        let mut ui = ui_cell.borrow_mut();

        // rpc is priority for font
        if ui.settings.font_source != FontSource::Rpc {
            ui.settings.update_font(ui);
            ui.on_redraw();
        }
    });
}