Remove gui dependencies from alacritty_terminal

This commit removes font dependency from alacritty_terminal,
so it'll simplify the usage of alacritty_terminal as a library,
since you won't link to system's libraries anymore. It also
moves many alacritty related config options from it.

Fixes #3393.

27 files changed, 350 insertions, 327 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9175fcad..46510dfd 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -49,7 +49,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - To use the cell's text color for selection with a modified background, the `color.selection.text`
     variable must now be set to `CellForeground` instead of omitting it
 - URLs are no longer highlighted without a clearly delimited scheme
-- Renamed `visual_bell` to `bell`
+- Renamed config option `visual_bell` to `bell`
+- Moved config option `dynamic_title` to `window.dynamic_title`
 
 ### Fixed
 
@@ -71,6 +72,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Ingoring of default FreeType properties
 - Alacritty crashing at startup when the configured font does not exist
 
+### Removed
+
+- Deprecated `window.start_maximized` config field
+- Deprecated `render_timer` config field
+- Deprecated `persistent_logging` config field
+
 ## 0.4.3
 
 ### Fixed
diff --git a/Cargo.lock b/Cargo.lock
index 1eb8cab2..663cf8ef 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -35,6 +35,7 @@ dependencies = [
  "libc 0.2.72 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "notify 4.0.15 (registry+https://github.com/rust-lang/crates.io-index)",
+ "objc 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.10.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "rustc_tools_util 0.2.0 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.114 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -55,7 +56,6 @@ version = "0.5.0-dev"
 dependencies = [
  "base64 0.12.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "bitflags 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
- "font 0.1.0",
  "libc 0.2.72 (registry+https://github.com/rust-lang/crates.io-index)",
  "log 0.4.8 (registry+https://github.com/rust-lang/crates.io-index)",
  "mio 0.6.22 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -64,7 +64,6 @@ dependencies = [
  "mio-named-pipes 0.1.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "miow 0.3.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "nix 0.17.0 (registry+https://github.com/rust-lang/crates.io-index)",
- "objc 0.2.7 (registry+https://github.com/rust-lang/crates.io-index)",
  "parking_lot 0.10.2 (registry+https://github.com/rust-lang/crates.io-index)",
  "regex-automata 0.1.9 (registry+https://github.com/rust-lang/crates.io-index)",
  "serde 1.0.114 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/alacritty/Cargo.toml b/alacritty/Cargo.toml
index b5dc924f..c30bc370 100644
--- a/alacritty/Cargo.toml
+++ b/alacritty/Cargo.toml
@@ -36,6 +36,9 @@ xdg = "2"
 [target.'cfg(not(target_os = "macos"))'.dependencies]
 image = { version = "0.23.3", default-features = false, features = ["ico"] }
 
+[target.'cfg(target_os = "macos")'.dependencies]
+objc = "0.2.2"
+
 [target.'cfg(any(target_os = "macos", windows))'.dependencies]
 dirs = "2.0.2"
 
diff --git a/alacritty/src/cli.rs b/alacritty/src/cli.rs
index 89db20e1..1f677488 100644
--- a/alacritty/src/cli.rs
+++ b/alacritty/src/cli.rs
@@ -4,9 +4,11 @@ use std::path::PathBuf;
 use clap::{crate_authors, crate_description, crate_name, crate_version, App, Arg};
 use log::{self, error, LevelFilter};
 
-use alacritty_terminal::config::{Delta, Dimensions, Program, DEFAULT_NAME};
+use alacritty_terminal::config::Program;
 use alacritty_terminal::index::{Column, Line};
 
+use crate::config::ui_config::Delta;
+use crate::config::window::{Dimensions, DEFAULT_NAME};
 use crate::config::Config;
 
 #[cfg(not(any(target_os = "macos", windows)))]
@@ -263,35 +265,42 @@ impl Options {
         }
 
         if let Some(lcr) = self.live_config_reload {
-            config.set_live_config_reload(lcr);
+            config.ui_config.set_live_config_reload(lcr);
         }
         config.shell = self.command.or(config.shell);
 
         config.hold = self.hold;
 
-        config.set_dynamic_title(config.dynamic_title() && self.title.is_none());
-        config.window.dimensions = self.dimensions.unwrap_or(config.window.dimensions);
-        config.window.title = self.title.unwrap_or(config.window.title);
-        config.window.position = self.position.or(config.window.position);
-        config.window.embed = self.embed.and_then(|embed| embed.parse().ok());
+        let dynamic_title = config.ui_config.dynamic_title() && self.title.is_none();
+        config.ui_config.set_dynamic_title(dynamic_title);
 
-        config.window.class.instance = self.class_instance.unwrap_or(config.window.class.instance);
-        config.window.class.general = self.class_general.unwrap_or(config.window.class.general);
+        replace_if_some(&mut config.ui_config.window.dimensions, self.dimensions);
+        replace_if_some(&mut config.ui_config.window.title, self.title);
+        config.ui_config.window.position = self.position.or(config.ui_config.window.position);
+        config.ui_config.window.embed = self.embed.and_then(|embed| embed.parse().ok());
+        replace_if_some(&mut config.ui_config.window.class.instance, self.class_instance);
+        replace_if_some(&mut config.ui_config.window.class.general, self.class_general);
 
-        config.debug.print_events = self.print_events || config.debug.print_events;
-        config.debug.log_level = max(config.debug.log_level, self.log_level);
-        config.debug.ref_test = self.ref_test || config.debug.ref_test;
-        config.debug.persistent_logging =
-            self.persistent_logging || config.debug.persistent_logging;
+        config.ui_config.debug.print_events |= self.print_events;
+        config.ui_config.debug.log_level = max(config.ui_config.debug.log_level, self.log_level);
+        config.ui_config.debug.ref_test |= self.ref_test;
+        config.ui_config.debug.persistent_logging |= self.persistent_logging;
 
-        if config.debug.print_events {
-            config.debug.log_level = max(config.debug.log_level, LevelFilter::Info);
+        if config.ui_config.debug.print_events {
+            config.ui_config.debug.log_level =
+                max(config.ui_config.debug.log_level, LevelFilter::Info);
         }
 
         config
     }
 }
 
+fn replace_if_some<T>(option: &mut T, value: Option<T>) {
+    if let Some(value) = value {
+        *option = value;
+    }
+}
+
 #[cfg(test)]
 mod tests {
     use crate::cli::Options;
@@ -300,11 +309,11 @@ mod tests {
     #[test]
     fn dynamic_title_ignoring_options_by_default() {
         let config = Config::default();
-        let old_dynamic_title = config.dynamic_title();
+        let old_dynamic_title = config.ui_config.dynamic_title();
 
         let config = Options::default().into_config(config);
 
-        assert_eq!(old_dynamic_title, config.dynamic_title());
+        assert_eq!(old_dynamic_title, config.ui_config.dynamic_title());
     }
 
     #[test]
@@ -315,16 +324,16 @@ mod tests {
         options.title = Some("foo".to_owned());
         let config = options.into_config(config);
 
-        assert!(!config.dynamic_title());
+        assert!(!config.ui_config.dynamic_title());
     }
 
     #[test]
     fn dynamic_title_not_overridden_by_config() {
         let mut config = Config::default();
 
-        config.window.title = "foo".to_owned();
+        config.ui_config.window.title = "foo".to_owned();
         let config = Options::default().into_config(config);
 
-        assert!(config.dynamic_title());
+        assert!(config.ui_config.dynamic_title());
     }
 }
diff --git a/alacritty_terminal/src/config/debug.rs b/alacritty/src/config/debug.rs
index 9c9d4fde..62de0500 100644
--- a/alacritty_terminal/src/config/debug.rs
+++ b/alacritty/src/config/debug.rs
@@ -1,7 +1,7 @@
 use log::{error, LevelFilter};
 use serde::{Deserialize, Deserializer};
 
-use crate::config::{failure_default, LOG_TARGET_CONFIG};
+use alacritty_terminal::config::{failure_default, LOG_TARGET_CONFIG};
 
 /// Debugging options.
 #[serde(default)]
diff --git a/alacritty_terminal/src/config/font.rs b/alacritty/src/config/font.rs
index 6a9120c9..f718587c 100644
--- a/alacritty_terminal/src/config/font.rs
+++ b/alacritty/src/config/font.rs
@@ -5,9 +5,11 @@ use log::error;
 use serde::de::Visitor;
 use serde::{Deserialize, Deserializer};
 
+use alacritty_terminal::config::{failure_default, LOG_TARGET_CONFIG};
+
 #[cfg(target_os = "macos")]
-use crate::config::DefaultTrueBool;
-use crate::config::{failure_default, Delta, LOG_TARGET_CONFIG};
+use crate::config::ui_config::DefaultTrueBool;
+use crate::config::ui_config::Delta;
 
 /// Font config.
 ///
diff --git a/alacritty/src/config/mod.rs b/alacritty/src/config/mod.rs
index e6437d26..7fffcc39 100644
--- a/alacritty/src/config/mod.rs
+++ b/alacritty/src/config/mod.rs
@@ -11,9 +11,12 @@ use log::{error, warn};
 use alacritty_terminal::config::{Config as TermConfig, LOG_TARGET_CONFIG};
 
 mod bindings;
+pub mod debug;
+pub mod font;
 pub mod monitor;
 mod mouse;
-mod ui_config;
+pub mod ui_config;
+pub mod window;
 
 pub use crate::config::bindings::{Action, Binding, Key, ViAction};
 #[cfg(test)]
@@ -172,27 +175,6 @@ fn parse_config(contents: &str) -> Result<Config> {
 }
 
 fn print_deprecation_warnings(config: &Config) {
-    if config.window.start_maximized.is_some() {
-        warn!(
-            target: LOG_TARGET_CONFIG,
-            "Config window.start_maximized is deprecated; please use window.startup_mode instead"
-        );
-    }
-
-    if config.render_timer.is_some() {
-        warn!(
-            target: LOG_TARGET_CONFIG,
-            "Config render_timer is deprecated; please use debug.render_timer instead"
-        );
-    }
-
-    if config.persistent_logging.is_some() {
-        warn!(
-            target: LOG_TARGET_CONFIG,
-            "Config persistent_logging is deprecated; please use debug.persistent_logging instead"
-        );
-    }
-
     if config.scrolling.faux_multiplier().is_some() {
         warn!(
             target: LOG_TARGET_CONFIG,
@@ -224,6 +206,13 @@ fn print_deprecation_warnings(config: &Config) {
             "Config visual_bell has been deprecated; please use bell instead"
         )
     }
+
+    if config.ui_config.dynamic_title.is_some() {
+        warn!(
+            target: LOG_TARGET_CONFIG,
+            "Config dynamic_title is deprecated; please use window.dynamic_title instead",
+        )
+    }
 }
 
 #[cfg(test)]
diff --git a/alacritty/src/config/ui_config.rs b/alacritty/src/config/ui_config.rs
index 49e54e05..a8b1749f 100644
--- a/alacritty/src/config/ui_config.rs
+++ b/alacritty/src/config/ui_config.rs
@@ -1,13 +1,24 @@
 use log::error;
 use serde::{Deserialize, Deserializer};
 
-use alacritty_terminal::config::{failure_default, LOG_TARGET_CONFIG};
+use alacritty_terminal::config::{failure_default, Percentage, LOG_TARGET_CONFIG};
 
 use crate::config::bindings::{self, Binding, KeyBinding, MouseBinding};
+use crate::config::debug::Debug;
+use crate::config::font::Font;
 use crate::config::mouse::Mouse;
+use crate::config::window::WindowConfig;
 
 #[derive(Debug, PartialEq, Deserialize)]
 pub struct UIConfig {
+    /// Font configuration.
+    #[serde(default, deserialize_with = "failure_default")]
+    pub font: Font,
+
+    /// Window configuration.
+    #[serde(default, deserialize_with = "failure_default")]
+    pub window: WindowConfig,
+
     #[serde(default, deserialize_with = "failure_default")]
     pub mouse: Mouse,
 
@@ -18,18 +29,79 @@ pub struct UIConfig {
     /// Bindings for the mouse.
     #[serde(default = "default_mouse_bindings", deserialize_with = "deserialize_mouse_bindings")]
     pub mouse_bindings: Vec<MouseBinding>,
+
+    /// Debug options.
+    #[serde(default, deserialize_with = "failure_default")]
+    pub debug: Debug,
+
+    /// Send escape sequences using the alt key.
+    #[serde(default, deserialize_with = "failure_default")]
+    alt_send_esc: DefaultTrueBool,
+
+    /// Live config reload.
+    #[serde(default, deserialize_with = "failure_default")]
+    live_config_reload: DefaultTrueBool,
+
+    /// Background opacity from 0.0 to 1.0.
+    #[serde(default, deserialize_with = "failure_default")]
+    background_opacity: Percentage,
+
+    // TODO: DEPRECATED
+    #[serde(default, deserialize_with = "failure_default")]
+    pub dynamic_title: Option<bool>,
 }
 
 impl Default for UIConfig {
     fn default() -> Self {
         UIConfig {
-            mouse: Mouse::default(),
+            font: Default::default(),
+            window: Default::default(),
+            mouse: Default::default(),
             key_bindings: default_key_bindings(),
             mouse_bindings: default_mouse_bindings(),
+            debug: Default::default(),
+            alt_send_esc: Default::default(),
+            background_opacity: Default::default(),
+            live_config_reload: Default::default(),
+            dynamic_title: Default::default(),
         }
     }
 }
 
+impl UIConfig {
+    #[inline]
+    pub fn background_opacity(&self) -> f32 {
+        self.background_opacity.as_f32()
+    }
+
+    #[inline]
+    pub fn dynamic_title(&self) -> bool {
+        self.dynamic_title.unwrap_or_else(|| self.window.dynamic_title())
+    }
+
+    #[inline]
+    pub fn set_dynamic_title(&mut self, dynamic_title: bool) {
+        self.window.set_dynamic_title(dynamic_title);
+    }
+
+    /// Live config reload.
+    #[inline]
+    pub fn live_config_reload(&self) -> bool {
+        self.live_config_reload.0
+    }
+
+    #[inline]
+    pub fn set_live_config_reload(&mut self, live_config_reload: bool) {
+        self.live_config_reload.0 = live_config_reload;
+    }
+
+    /// Send escape sequences using the alt key.
+    #[inline]
+    pub fn alt_send_esc(&self) -> bool {
+        self.alt_send_esc.0
+    }
+}
+
 fn default_key_bindings() -> Vec<KeyBinding> {
     bindings::default_key_bindings()
 }
@@ -83,3 +155,24 @@ where
 
     Ok(bindings)
 }
+
+#[derive(Deserialize, Copy, Clone, Debug, PartialEq, Eq)]
+pub struct DefaultTrueBool(pub bool);
+
+impl Default for DefaultTrueBool {
+    fn default() -> Self {
+        DefaultTrueBool(true)
+    }
+}
+
+/// A delta for a point in a 2 dimensional plane.
+#[serde(default, bound(deserialize = "T: Deserialize<'de> + Default"))]
+#[derive(Clone, Copy, Debug, Default, Deserialize, PartialEq, Eq)]
+pub struct Delta<T: Default + PartialEq + Eq> {
+    /// Horizontal change.
+    #[serde(deserialize_with = "failure_default")]
+    pub x: T,
+    /// Vertical change.
+    #[serde(deserialize_with = "failure_default")]
+    pub y: T,
+}
diff --git a/alacritty_terminal/src/config/window.rs b/alacritty/src/config/window.rs
index b410f0a2..f866e180 100644
--- a/alacritty_terminal/src/config/window.rs
+++ b/alacritty/src/config/window.rs
@@ -4,8 +4,10 @@ use log::error;
 use serde::{Deserialize, Deserializer};
 use serde_yaml::Value;
 
-use crate::config::{failure_default, option_explicit_none, Delta, LOG_TARGET_CONFIG};
-use crate::index::{Column, Line};
+use alacritty_terminal::config::{failure_default, option_explicit_none, LOG_TARGET_CONFIG};
+use alacritty_terminal::index::{Column, Line};
+
+use crate::config::ui_config::{DefaultTrueBool, Delta};
 
 /// Default Alacritty name, used for window title and class.
 pub const DEFAULT_NAME: &str = "Alacritty";
@@ -35,7 +37,7 @@ pub struct WindowConfig {
 
     /// Startup mode.
     #[serde(deserialize_with = "failure_default")]
-    startup_mode: StartupMode,
+    pub startup_mode: StartupMode,
 
     /// Window title.
     #[serde(default = "default_title")]
@@ -53,9 +55,9 @@ pub struct WindowConfig {
     #[serde(deserialize_with = "option_explicit_none")]
     pub gtk_theme_variant: Option<String>,
 
-    // TODO: DEPRECATED
-    #[serde(deserialize_with = "failure_default")]
-    pub start_maximized: Option<bool>,
+    /// Use dynamic title.
+    #[serde(default, deserialize_with = "failure_default")]
+    dynamic_title: DefaultTrueBool,
 }
 
 pub fn default_title() -> String {
@@ -63,11 +65,14 @@ pub fn default_title() -> String {
 }
 
 impl WindowConfig {
-    pub fn startup_mode(&self) -> StartupMode {
-        match self.start_maximized {
-            Some(true) => StartupMode::Maximized,
-            _ => self.startup_mode,
-        }
+    #[inline]
+    pub fn dynamic_title(&self) -> bool {
+        self.dynamic_title.0
+    }
+
+    #[inline]
+    pub fn set_dynamic_title(&mut self, dynamic_title: bool) {
+        self.dynamic_title.0 = dynamic_title;
     }
 }
 
@@ -83,8 +88,8 @@ impl Default for WindowConfig {
             class: Default::default(),
             embed: Default::default(),
             gtk_theme_variant: Default::default(),
-            start_maximized: Default::default(),
             title: default_title(),
+            dynamic_title: Default::default(),
         }
     }
 }
diff --git a/alacritty/src/display.rs b/alacritty/src/display.rs
index 0a3bea34..ab6ed7e6 100644
--- a/alacritty/src/display.rs
+++ b/alacritty/src/display.rs
@@ -22,19 +22,23 @@ use wayland_client::{Display as WaylandDisplay, EventQueue};
 
 #[cfg(target_os = "macos")]
 use font::set_font_smoothing;
-use font::{self, Rasterize};
+use font::{self, Rasterize, Rasterizer};
 
-use alacritty_terminal::config::{Font, StartupMode};
 use alacritty_terminal::event::{EventListener, OnResize};
+#[cfg(not(windows))]
 use alacritty_terminal::grid::Dimensions;
-use alacritty_terminal::index::{Column, Line, Point};
-use alacritty_terminal::message_bar::MessageBuffer;
-use alacritty_terminal::meter::Meter;
+use alacritty_terminal::index::Line;
+#[cfg(not(windows))]
+use alacritty_terminal::index::{Column, Point};
 use alacritty_terminal::selection::Selection;
 use alacritty_terminal::term::{RenderableCell, SizeInfo, Term, TermMode};
 
+use crate::config::font::Font;
+use crate::config::window::StartupMode;
 use crate::config::Config;
 use crate::event::Mouse;
+use crate::message_bar::MessageBuffer;
+use crate::meter::Meter;
 use crate::renderer::rects::{RenderLines, RenderRect};
 use crate::renderer::{self, GlyphCache, QuadRenderer};
 use crate::url::{Url, Urls};
@@ -167,10 +171,15 @@ impl Display {
             event_loop.available_monitors().next().map(|m| m.scale_factor()).unwrap_or(1.);
 
         // Guess the target window dimensions.
-        let metrics = GlyphCache::static_metrics(config.font.clone(), estimated_dpr)?;
+        let metrics = GlyphCache::static_metrics(config.ui_config.font.clone(), estimated_dpr)?;
         let (cell_width, cell_height) = compute_cell_size(config, &metrics);
-        let dimensions =
-            GlyphCache::calculate_dimensions(config, estimated_dpr, cell_width, cell_height);
+
+        let dimensions = GlyphCache::calculate_dimensions(
+            &config.ui_config.window,
+            estimated_dpr,
+            cell_width,
+            cell_height,
+        );
 
         debug!("Estimated DPR: {}", estimated_dpr);
         debug!("Estimated Cell Size: {} x {}", cell_width, cell_height);
@@ -212,11 +221,12 @@ impl Display {
         let (glyph_cache, cell_width, cell_height) =
             Self::new_glyph_cache(dpr, &mut renderer, config)?;
 
-        let mut padding_x = f32::from(config.window.padding.x) * dpr as f32;
-        let mut padding_y = f32::from(config.window.padding.y) * dpr as f32;
+        let padding = config.ui_config.window.padding;
+        let mut padding_x = f32::from(padding.x) * dpr as f32;
+        let mut padding_y = f32::from(padding.y) * dpr as f32;
 
         if let Some((width, height)) =
-            GlyphCache::calculate_dimensions(config, dpr, cell_width, cell_height)
+            GlyphCache::calculate_dimensions(&config.ui_config.window, dpr, cell_width, cell_height)
         {
             let PhysicalSize { width: w, height: h } = window.inner_size();
             if w == width && h == height {
@@ -224,7 +234,7 @@ impl Display {
             } else {
                 window.set_inner_size(PhysicalSize::new(width, height));
             }
-        } else if config.window.dynamic_padding {
+        } else if config.ui_config.window.dynamic_padding {
             // Make sure additional padding is spread evenly.
             padding_x = dynamic_padding(padding_x, viewport_size.width as f32, cell_width);
             padding_y = dynamic_padding(padding_y, viewport_size.height as f32, cell_height);
@@ -252,13 +262,13 @@ impl Display {
 
         // Clear screen.
         let background_color = config.colors.primary.background;
-        renderer.with_api(&config, &size_info, |api| {
+        renderer.with_api(&config.ui_config, config.cursor, &size_info, |api| {
             api.clear(background_color);
         });
 
         // Set subpixel anti-aliasing.
         #[cfg(target_os = "macos")]
-        set_font_smoothing(config.font.use_thin_strokes());
+        set_font_smoothing(config.ui_config.font.use_thin_strokes());
 
         #[cfg(not(any(target_os = "macos", windows)))]
         let is_x11 = event_loop.is_x11();
@@ -269,7 +279,7 @@ impl Display {
             // actually draw something into it and commit those changes.
             if is_x11 {
                 window.swap_buffers();
-                renderer.with_api(&config, &size_info, |api| {
+                renderer.with_api(&config.ui_config, config.cursor, &size_info, |api| {
                     api.finish();
                 });
             }
@@ -281,12 +291,12 @@ impl Display {
         //
         // TODO: replace `set_position` with `with_position` once available.
         // Upstream issue: https://github.com/rust-windowing/winit/issues/806.
-        if let Some(position) = config.window.position {
+        if let Some(position) = config.ui_config.window.position {
             window.set_outer_position(PhysicalPosition::from((position.x, position.y)));
         }
 
         #[allow(clippy::single_match)]
-        match config.window.startup_mode() {
+        match config.ui_config.window.startup_mode {
             StartupMode::Fullscreen => window.set_fullscreen(true),
             #[cfg(target_os = "macos")]
             StartupMode::SimpleFullscreen => window.set_simple_fullscreen(true),
@@ -315,8 +325,8 @@ impl Display {
         renderer: &mut QuadRenderer,
         config: &Config,
     ) -> Result<(GlyphCache, f32, f32), Error> {
-        let font = config.font.clone();
-        let rasterizer = font::Rasterizer::new(dpr as f32, config.font.use_thin_strokes())?;
+        let font = config.ui_config.font.clone();
+        let rasterizer = Rasterizer::new(dpr as f32, config.ui_config.font.use_thin_strokes())?;
 
         // Initialize glyph cache.
         let glyph_cache = {
@@ -387,8 +397,9 @@ impl Display {
         let cell_height = self.size_info.cell_height;
 
         // Recalculate padding.
-        let mut padding_x = f32::from(config.window.padding.x) * self.size_info.dpr as f32;
-        let mut padding_y = f32::from(config.window.padding.y) * self.size_info.dpr as f32;
+        let padding = config.ui_config.window.padding;
+        let mut padding_x = f32::from(padding.x) * self.size_info.dpr as f32;
+        let mut padding_y = f32::from(padding.y) * self.size_info.dpr as f32;
 
         // Update the window dimensions.
         if let Some(size) = update_pending.dimensions() {
@@ -398,7 +409,7 @@ impl Display {
         }
 
         // Distribute excess padding equally on all sides.
-        if config.window.dynamic_padding {
+        if config.ui_config.window.dynamic_padding {
             padding_x = dynamic_padding(padding_x, self.size_info.width, cell_width);
             padding_y = dynamic_padding(padding_y, self.size_info.height, cell_height);
         }
@@ -480,7 +491,7 @@ impl Display {
         // Drop terminal as early as possible to free lock.
         drop(terminal);
 
-        self.renderer.with_api(&config, &size_info, |api| {
+        self.renderer.with_api(&config.ui_config, config.cursor, &size_info, |api| {
             api.clear(background_color);
         });
 
@@ -491,7 +502,7 @@ impl Display {
         {
             let _sampler = self.meter.sampler();
 
-            self.renderer.with_api(&config, &size_info, |mut api| {
+            self.renderer.with_api(&config.ui_config, config.cursor, &size_info, |mut api| {
                 // Iterate over all non-empty cells in the grid.
                 for cell in grid_cells {
                     // Update URL underlines.
@@ -566,7 +577,7 @@ impl Display {
             // Relay messages to the user.
             let fg = config.colors.primary.background;
             for (i, message_text) in text.iter().rev().enumerate() {
-                self.renderer.with_api(&config, &size_info, |mut api| {
+                self.renderer.with_api(&config.ui_config, config.cursor, &size_info, |mut api| {
                     api.render_string(
                         glyph_cache,
                         Line(size_info.lines().saturating_sub(i + 1)),
@@ -597,7 +608,7 @@ impl Display {
                 // On X11 `swap_buffers` does not block for vsync. However the next OpenGl command
                 // will block to synchronize (this is `glClear` in Alacritty), which causes a
                 // permanent one frame delay.
-                self.renderer.with_api(&config, &size_info, |api| {
+                self.renderer.with_api(&config.ui_config, config.cursor, &size_info, |api| {
                     api.finish();
                 });
             }
@@ -650,14 +661,14 @@ impl Display {
         let fg = config.colors.search_bar_foreground();
         let bg = config.colors.search_bar_background();
         let line = size_info.lines() - message_bar_lines - 1;
-        self.renderer.with_api(&config, &size_info, |mut api| {
+        self.renderer.with_api(&config.ui_config, config.cursor, &size_info, |mut api| {
             api.render_string(glyph_cache, line, &text, fg, Some(bg));
         });
     }
 
     /// Draw render timer.
     fn draw_render_timer(&mut self, config: &Config, size_info: &SizeInfo) {
-        if !config.render_timer() {
+        if !config.ui_config.debug.render_timer {
             return;
         }
         let glyph_cache = &mut self.glyph_cache;
@@ -666,7 +677,7 @@ impl Display {
         let fg = config.colors.normal().black;
         let bg = config.colors.normal().red;
 
-        self.renderer.with_api(&config, &size_info, |mut api| {
+        self.renderer.with_api(&config.ui_config, config.cursor, &size_info, |mut api| {
             api.render_string(glyph_cache, size_info.lines() - 2, &timing[..], fg, Some(bg));
         });
     }
@@ -701,8 +712,8 @@ fn dynamic_padding(padding: f32, dimension: f32, cell_dimension: f32) -> f32 {
 /// Calculate the cell dimensions based on font metrics.
 #[inline]
 fn compute_cell_size(config: &Config, metrics: &font::Metrics) -> (f32, f32) {
-    let offset_x = f64::from(config.font.offset.x);
-    let offset_y = f64::from(config.font.offset.y);
+    let offset_x = f64::from(config.ui_config.font.offset.x);
+    let offset_y = f64::from(config.ui_config.font.offset.y);
     (
         ((metrics.average_advance + offset_x) as f32).floor().max(1.),
         ((metrics.line_height + offset_y) as f32).floor().max(1.),
diff --git a/alacritty/src/event.rs b/alacritty/src/event.rs
index c651fda3..f90ebdd3 100644
--- a/alacritty/src/event.rs
+++ b/alacritty/src/event.rs
@@ -32,7 +32,6 @@ use alacritty_terminal::config::LOG_TARGET_CONFIG;
 use alacritty_terminal::event::{Event as TerminalEvent, EventListener, Notify, OnResize};
 use alacritty_terminal::grid::{Dimensions, Scroll};
 use alacritty_terminal::index::{Column, Direction, Line, Point, Side};
-use alacritty_terminal::message_bar::{Message, MessageBuffer};
 use alacritty_terminal::selection::{Selection, SelectionType};
 use alacritty_terminal::sync::FairMutex;
 use alacritty_terminal::term::cell::Cell;
@@ -47,6 +46,7 @@ use crate::config::Config;
 use crate::daemon::start_daemon;
 use crate::display::{Display, DisplayUpdate};
 use crate::input::{self, ActionContext as _, FONT_SIZE_STEP};
+use crate::message_bar::{Message, MessageBuffer};
 use crate::scheduler::{Scheduler, TimerId};
 use crate::url::{Url, Urls};
 use crate::window::Window;
@@ -312,14 +312,14 @@ impl<'a, N: Notify + 'a, T: EventListener> input::ActionContext<T> for ActionCon
 
     fn change_font_size(&mut self, delta: f32) {
         *self.font_size = max(*self.font_size + delta, Size::new(FONT_SIZE_STEP));
-        let font = self.config.font.clone().with_size(*self.font_size);
+        let font = self.config.ui_config.font.clone().with_size(*self.font_size);
         self.display_update_pending.set_font(font);
         self.terminal.dirty = true;
     }
 
     fn reset_font_size(&mut self) {
-        *self.font_size = self.config.font.size;
-        self.display_update_pending.set_font(self.config.font.clone());
+        *self.font_size = self.config.ui_config.font.size;
+        self.display_update_pending.set_font(self.config.ui_config.font.clone());
         self.terminal.dirty = true;
     }
 
@@ -636,7 +636,7 @@ impl<N: Notify + OnResize> Processor<N> {
             received_count: 0,
             suppress_chars: false,
             modifiers: Default::default(),
-            font_size: config.font.size,
+            font_size: config.ui_config.font.size,
             config,
             message_buffer,
             display,
@@ -679,7 +679,7 @@ impl<N: Notify + OnResize> Processor<N> {
         let mut scheduler = Scheduler::new();
 
         event_loop.run_return(|event, event_loop, control_flow| {
-            if self.config.debug.print_events {
+            if self.config.ui_config.debug.print_events {
                 info!("glutin event: {:?}", event);
             }
 
@@ -791,7 +791,7 @@ impl<N: Notify + OnResize> Processor<N> {
         });
 
         // Write ref tests to disk.
-        if self.config.debug.ref_test {
+        if self.config.ui_config.debug.ref_test {
             self.write_ref_test_results(&terminal.lock());
         }
     }
@@ -811,7 +811,7 @@ impl<N: Notify + OnResize> Processor<N> {
                     let display_update_pending = &mut processor.ctx.display_update_pending;
 
                     // Push current font to update its DPR.
-                    let font = processor.ctx.config.font.clone();
+                    let font = processor.ctx.config.ui_config.font.clone();
                     display_update_pending.set_font(font.with_size(*processor.ctx.font_size));
 
                     // Resize to event's dimensions, since no resize event is emitted on Wayland.
@@ -829,7 +829,18 @@ impl<N: Notify + OnResize> Processor<N> {
                 Event::ConfigReload(path) => Self::reload_config(&path, processor),
                 Event::Scroll(scroll) => processor.ctx.scroll(scroll),
                 Event::TerminalEvent(event) => match event {
-                    TerminalEvent::Title(title) => processor.ctx.window.set_title(&title),
+                    TerminalEvent::Title(title) => {
+                        let ui_config = &processor.ctx.config.ui_config;
+                        if ui_config.dynamic_title() {
+                            processor.ctx.window.set_title(&title);
+                        }
+                    },
+                    TerminalEvent::ResetTitle => {
+                        let ui_config = &processor.ctx.config.ui_config;
+                        if ui_config.dynamic_title() {
+                            processor.ctx.window.set_title(&ui_config.window.title);
+                        }
+                    },
                     TerminalEvent::Wakeup => processor.ctx.terminal.dirty = true,
                     TerminalEvent::Bell => {
                         let bell_command = processor.ctx.config.bell().command.as_ref();
@@ -983,16 +994,23 @@ impl<N: Notify + OnResize> Processor<N> {
             processor.ctx.display_update_pending.set_cursor_dirty();
         }
 
-        if processor.ctx.config.font != config.font {
+        if processor.ctx.config.ui_config.font != config.ui_config.font {
             // Do not update font size if it has been changed at runtime.
-            if *processor.ctx.font_size == processor.ctx.config.font.size {
-                *processor.ctx.font_size = config.font.size;
+            if *processor.ctx.font_size == processor.ctx.config.ui_config.font.size {
+                *processor.ctx.font_size = config.ui_config.font.size;
             }
 
-            let font = config.font.clone().with_size(*processor.ctx.font_size);
+            let font = config.ui_config.font.clone().with_size(*processor.ctx.font_size);
             processor.ctx.display_update_pending.set_font(font);
         }
 
+        // Live title reload.
+        if !config.ui_config.dynamic_title()
+            || processor.ctx.config.ui_config.window.title != config.ui_config.window.title
+        {
+            processor.ctx.window.set_title(&config.ui_config.window.title);
+        }
+
         #[cfg(not(any(target_os = "macos", windows)))]
         {
             if processor.ctx.event_loop.is_wayland() {
@@ -1002,7 +1020,7 @@ impl<N: Notify + OnResize> Processor<N> {
 
         // Set subpixel anti-aliasing.
         #[cfg(target_os = "macos")]
-        set_font_smoothing(config.font.use_thin_strokes());
+        set_font_smoothing(config.ui_config.font.use_thin_strokes());
 
         *processor.ctx.config = config;
 
diff --git a/alacritty/src/input.rs b/alacritty/src/input.rs
index 64b79002..2d865990 100644
--- a/alacritty/src/input.rs
+++ b/alacritty/src/input.rs
@@ -26,7 +26,6 @@ use alacritty_terminal::ansi::{ClearMode, Handler};
 use alacritty_terminal::event::EventListener;
 use alacritty_terminal::grid::{Dimensions, Scroll};
 use alacritty_terminal::index::{Column, Direction, Line, Point, Side};
-use alacritty_terminal::message_bar::{self, Message};
 use alacritty_terminal::selection::SelectionType;
 use alacritty_terminal::term::mode::TermMode;
 use alacritty_terminal::term::{ClipboardType, SizeInfo, Term};
@@ -36,6 +35,7 @@ use crate::clipboard::Clipboard;
 use crate::config::{Action, Binding, Config, Key, ViAction};
 use crate::daemon::start_daemon;
 use crate::event::{ClickState, Event, Mouse, TYPING_SEARCH_DELAY};
+use crate::message_bar::{self, Message};
 use crate::scheduler::{Scheduler, TimerId};
 use crate::url::{Url, Urls};
 use crate::window::Window;
@@ -894,7 +894,7 @@ impl<'a, T: EventListener, A: ActionContext<T>> Processor<'a, T, A> {
             c.encode_utf8(&mut bytes[..]);
         }
 
-        if self.ctx.config().alt_send_esc()
+        if self.ctx.config().ui_config.alt_send_esc()
             && *self.ctx.received_count() == 0
             && self.ctx.modifiers().alt()
             && utf8_len == 1
@@ -1088,10 +1088,10 @@ mod tests {
     use glutin::event::{Event as GlutinEvent, VirtualKeyCode, WindowEvent};
 
     use alacritty_terminal::event::Event as TerminalEvent;
-    use alacritty_terminal::message_bar::MessageBuffer;
     use alacritty_terminal::selection::Selection;
 
     use crate::config::ClickHandler;
+    use crate::message_bar::MessageBuffer;
 
     const KEY: VirtualKeyCode = VirtualKeyCode::Key0;
 
diff --git a/alacritty_terminal/src/locale.rs b/alacritty/src/locale.rs
index 0a72e775..6c02c12c 100644
--- a/alacritty_terminal/src/locale.rs
+++ b/alacritty/src/locale.rs
@@ -9,6 +9,7 @@ use std::str;
 use libc::{setlocale, LC_ALL, LC_CTYPE};
 use log::debug;
 use objc::runtime::{Class, Object};
+use objc::{msg_send, sel, sel_impl};
 
 const FALLBACK_LOCALE: &str = "UTF-8";
 
diff --git a/alacritty/src/logging.rs b/alacritty/src/logging.rs
index a6fcf3fb..5d702999 100644
--- a/alacritty/src/logging.rs
+++ b/alacritty/src/logging.rs
@@ -15,11 +15,11 @@ use std::sync::{Arc, Mutex};
 use glutin::event_loop::EventLoopProxy;
 use log::{self, Level};
 
-use alacritty_terminal::message_bar::Message;
 use alacritty_terminal::term::color;
 
 use crate::cli::Options;
 use crate::event::Event;
+use crate::message_bar::Message;
 
 const ALACRITTY_LOG_ENV: &str = "ALACRITTY_LOG";
 
diff --git a/alacritty/src/main.rs b/alacritty/src/main.rs
index 9fbcab55..ae3ef346 100644
--- a/alacritty/src/main.rs
+++ b/alacritty/src/main.rs
@@ -1,7 +1,6 @@
 //! Alacritty - The GPU Enhanced Terminal.
 
 #![deny(clippy::all, clippy::if_not_else, clippy::enum_glob_use, clippy::wrong_pub_self_convention)]
-#![cfg_attr(feature = "nightly", feature(core_intrinsics))]
 #![cfg_attr(all(test, feature = "bench"), feature(test))]
 // With the default subsystem, 'console', windows creates an additional console
 // window for the program.
@@ -24,10 +23,6 @@ use log::{error, info};
 use winapi::um::wincon::{AttachConsole, FreeConsole, ATTACH_PARENT_PROCESS};
 
 use alacritty_terminal::event_loop::{self, EventLoop, Msg};
-#[cfg(target_os = "macos")]
-use alacritty_terminal::locale;
-use alacritty_terminal::message_bar::MessageBuffer;
-use alacritty_terminal::panic;
 use alacritty_terminal::sync::FairMutex;
 use alacritty_terminal::term::Term;
 use alacritty_terminal::tty;
@@ -40,7 +35,13 @@ mod daemon;
 mod display;
 mod event;
 mod input;
+#[cfg(target_os = "macos")]
+mod locale;
 mod logging;
+mod message_bar;
+mod meter;
+#[cfg(windows)]
+mod panic;
 mod renderer;
 mod scheduler;
 mod url;
@@ -59,8 +60,10 @@ use crate::config::monitor::Monitor;
 use crate::config::Config;
 use crate::display::Display;
 use crate::event::{Event, EventProxy, Processor};
+use crate::message_bar::MessageBuffer;
 
 fn main() {
+    #[cfg(windows)]
     panic::attach_handler();
 
     // When linked with the windows subsystem windows won't automatically attach
@@ -87,7 +90,7 @@ fn main() {
     let config = options.into_config(config);
 
     // Update the log level from config.
-    log::set_max_level(config.debug.log_level);
+    log::set_max_level(config.ui_config.debug.log_level);
 
     // Switch to home directory.
     #[cfg(target_os = "macos")]
@@ -97,7 +100,7 @@ fn main() {
     locale::set_locale_environment();
 
     // Store if log file should be deleted before moving config.
-    let persistent_logging = config.persistent_logging();
+    let persistent_logging = config.ui_config.debug.persistent_logging;
 
     // Run Alacritty.
     if let Err(err) = run(window_event_loop, config) {
@@ -161,7 +164,13 @@ fn run(window_event_loop: GlutinEventLoop<Event>, config: Config) -> Result<(),
     // renderer and input processing. Note that access to the terminal state is
     // synchronized since the I/O loop updates the state, and the display
     // consumes it periodically.
-    let event_loop = EventLoop::new(Arc::clone(&terminal), event_proxy.clone(), pty, &config);
+    let event_loop = EventLoop::new(
+        Arc::clone(&terminal),
+        event_proxy.clone(),
+        pty,
+        config.hold,
+        config.ui_config.debug.ref_test,
+    );
 
     // The event loop channel allows write requests from the event processor
     // to be sent to the pty loop and ultimately written to the pty.
@@ -171,7 +180,7 @@ fn run(window_event_loop: GlutinEventLoop<Event>, config: Config) -> Result<(),
     //
     // The monitor watches the config file for changes and reloads it. Pending
     // config changes are processed in the main loop.
-    if config.live_config_reload() {
+    if config.ui_config.live_config_reload() {
         config.config_path.as_ref().map(|path| Monitor::new(path, event_proxy.clone()));
     }
 
diff --git a/alacritty_terminal/src/message_bar.rs b/alacritty/src/message_bar.rs
index 240581ff..175f7f81 100644
--- a/alacritty_terminal/src/message_bar.rs
+++ b/alacritty/src/message_bar.rs
@@ -1,7 +1,7 @@
 use std::collections::VecDeque;
 
-use crate::term::color::Rgb;
-use crate::term::SizeInfo;
+use alacritty_terminal::term::color::Rgb;
+use alacritty_terminal::term::SizeInfo;
 
 pub const CLOSE_BUTTON_TEXT: &str = "[X]";
 const CLOSE_BUTTON_PADDING: usize = 1;
@@ -161,7 +161,7 @@ impl MessageBuffer {
 #[cfg(test)]
 mod tests {
     use super::{Message, MessageBuffer, MIN_FREE_LINES};
-    use crate::term::{color, SizeInfo};
+    use alacritty_terminal::term::{color, SizeInfo};
 
     #[test]
     fn appends_close_button() {
diff --git a/alacritty_terminal/src/meter.rs b/alacritty/src/meter.rs
index c07d901f..c07d901f 100644
--- a/alacritty_terminal/src/meter.rs
+++ b/alacritty/src/meter.rs
diff --git a/alacritty_terminal/src/panic.rs b/alacritty/src/panic.rs
index 4ec409ff..9a76df72 100644
--- a/alacritty_terminal/src/panic.rs
+++ b/alacritty/src/panic.rs
@@ -1,13 +1,7 @@
-#[cfg(windows)]
-use crate::tty::windows::win32_string;
-
-// Use the default behavior of the other platforms.
-#[cfg(not(windows))]
-pub fn attach_handler() {}
+use alacritty_terminal::tty::windows::win32_string;
 
 // Install a panic handler that renders the panic in a classical Windows error
 // dialog box as well as writes the panic to STDERR.
-#[cfg(windows)]
 pub fn attach_handler() {
     use std::{io, io::Write, panic, ptr};
     use winapi::um::winuser;
diff --git a/alacritty/src/renderer/mod.rs b/alacritty/src/renderer/mod.rs
index 99e4afbc..09682e6e 100644
--- a/alacritty/src/renderer/mod.rs
+++ b/alacritty/src/renderer/mod.rs
@@ -1,4 +1,5 @@
 use std::collections::HashMap;
+use std::fmt::{self, Display, Formatter};
 use std::fs;
 use std::hash::BuildHasherDefault;
 use std::io;
@@ -10,7 +11,8 @@ use std::time::Duration;
 
 use fnv::FnvHasher;
 use font::{
-    self, BitmapBuffer, FontDesc, FontKey, GlyphKey, Rasterize, RasterizedGlyph, Rasterizer, Size,
+    BitmapBuffer, FontDesc, FontKey, GlyphKey, Rasterize, RasterizedGlyph, Rasterizer, Size, Slant,
+    Style, Weight,
 };
 use log::{error, info};
 use notify::{watcher, DebouncedEvent, RecursiveMode, Watcher};
@@ -19,16 +21,19 @@ use crate::cursor;
 use crate::gl;
 use crate::gl::types::*;
 use crate::renderer::rects::RenderRect;
-use alacritty_terminal::config::{self, Config, Delta, Font, StartupMode};
+use alacritty_terminal::config::Cursor;
 use alacritty_terminal::index::{Column, Line};
 use alacritty_terminal::term::cell::{self, Flags};
 use alacritty_terminal::term::color::Rgb;
-use alacritty_terminal::term::{self, CursorKey, RenderableCell, RenderableCellContent, SizeInfo};
+use alacritty_terminal::term::{CursorKey, RenderableCell, RenderableCellContent, SizeInfo};
 use alacritty_terminal::thread;
-use std::fmt::{self, Display, Formatter};
 
 pub mod rects;
 
+use crate::config::font::{Font, FontDescription};
+use crate::config::ui_config::{Delta, UIConfig};
+use crate::config::window::{StartupMode, WindowConfig};
+
 // Shader paths for live reload.
 static TEXT_SHADER_F_PATH: &str = concat!(env!("CARGO_MANIFEST_DIR"), "/../res/text.f.glsl");
 static TEXT_SHADER_V_PATH: &str = concat!(env!("CARGO_MANIFEST_DIR"), "/../res/text.v.glsl");
@@ -173,7 +178,7 @@ pub struct GlyphCache {
 impl GlyphCache {
     pub fn new<L>(
         mut rasterizer: Rasterizer,
-        font: &config::Font,
+        font: &Font,
         loader: &mut L,
     ) -> Result<GlyphCache, font::Error>
     where
@@ -215,14 +220,13 @@ impl GlyphCache {
 
     /// Computes font keys for (Regular, Bold, Italic, Bold Italic).
     fn compute_font_keys(
-        font: &config::Font,
+        font: &Font,
         rasterizer: &mut Rasterizer,
     ) -> Result<(FontKey, FontKey, FontKey, FontKey), font::Error> {
         let size = font.size;
 
         // Load regular font.
-        let regular_desc =
-            Self::make_desc(&font.normal(), font::Slant::Normal, font::Weight::Normal);
+        let regular_desc = Self::make_desc(&font.normal(), Slant::Normal, Weight::Normal);
 
         let regular = Self::load_regular_font(rasterizer, &regular_desc, size)?;
 
@@ -236,19 +240,17 @@ impl GlyphCache {
         };
 
         // Load bold font.
-        let bold_desc = Self::make_desc(&font.bold(), font::Slant::Normal, font::Weight::Bold);
+        let bold_desc = Self::make_desc(&font.bold(), Slant::Normal, Weight::Bold);
 
         let bold = load_or_regular(bold_desc);
 
         // Load italic font.
-        let italic_desc =
-            Self::make_desc(&font.italic(), font::Slant::Italic, font::Weight::Normal);
+        let italic_desc = Self::make_desc(&font.italic(), Slant::Italic, Weight::Normal);
 
         let italic = load_or_regular(italic_desc);
 
         // Load bold italic font.
-        let bold_italic_desc =
-            Self::make_desc(&font.bold_italic(), font::Slant::Italic, font::Weight::Bold);
+        let bold_italic_desc = Self::make_desc(&font.bold_italic(), Slant::Italic, Weight::Bold);
 
         let bold_italic = load_or_regular(bold_italic_desc);
 
@@ -265,25 +267,18 @@ impl GlyphCache {
             Err(err) => {
                 error!("{}", err);
 
-                let fallback_desc = Self::make_desc(
-                    &Font::default().normal(),
-                    font::Slant::Normal,
-                    font::Weight::Normal,
-                );
+                let fallback_desc =
+                    Self::make_desc(&Font::default().normal(), Slant::Normal, Weight::Normal);
                 rasterizer.load_font(&fallback_desc, size)
             },
         }
     }
 
-    fn make_desc(
-        desc: &config::FontDescription,
-        slant: font::Slant,
-        weight: font::Weight,
-    ) -> FontDesc {
+    fn make_desc(desc: &FontDescription, slant: Slant, weight: Weight) -> FontDesc {
         let style = if let Some(ref spec) = desc.style {
-            font::Style::Specific(spec.to_owned())
+            Style::Specific(spec.to_owned())
         } else {
-            font::Style::Description { slant, weight }
+            Style::Description { slant, weight }
         };
         FontDesc::new(desc.family.clone(), style)
     }
@@ -318,7 +313,7 @@ impl GlyphCache {
 
     pub fn update_font_size<L: LoadGlyph>(
         &mut self,
-        font: &config::Font,
+        font: &Font,
         dpr: f64,
         loader: &mut L,
     ) -> Result<(), font::Error> {
@@ -361,31 +356,30 @@ impl GlyphCache {
     /// Calculate font metrics without access to a glyph cache.
     pub fn static_metrics(font: Font, dpr: f64) -> Result<font::Metrics, font::Error> {
         let mut rasterizer = font::Rasterizer::new(dpr as f32, font.use_thin_strokes())?;
-        let regular_desc =
-            GlyphCache::make_desc(&font.normal(), font::Slant::Normal, font::Weight::Normal);
+        let regular_desc = GlyphCache::make_desc(&font.normal(), Slant::Normal, Weight::Normal);
         let regular = Self::load_regular_font(&mut rasterizer, &regular_desc, font.size)?;
         rasterizer.get_glyph(GlyphKey { font_key: regular, c: 'm', size: font.size })?;
 
         rasterizer.metrics(regular, font.size)
     }
 
-    pub fn calculate_dimensions<C>(
-        config: &Config<C>,
+    pub fn calculate_dimensions(
+        window_config: &WindowConfig,
         dpr: f64,
         cell_width: f32,
         cell_height: f32,
     ) -> Option<(u32, u32)> {
-        let dimensions = config.window.dimensions;
+        let dimensions = window_config.dimensions;
 
         if dimensions.columns_u32() == 0
             || dimensions.lines_u32() == 0
-            || config.window.startup_mode() != StartupMode::Windowed
+            || window_config.startup_mode != StartupMode::Windowed
         {
             return None;
         }
 
-        let padding_x = f64::from(config.window.padding.x) * dpr;
-        let padding_y = f64::from(config.window.padding.y) * dpr;
+        let padding_x = f64::from(window_config.padding.x) * dpr;
+        let padding_y = f64::from(window_config.padding.y) * dpr;
 
         // Calculate new size based on cols/lines specified in config.
         let grid_width = cell_width as u32 * dimensions.columns_u32();
@@ -446,13 +440,14 @@ pub struct QuadRenderer {
 }
 
 #[derive(Debug)]
-pub struct RenderApi<'a, C> {
+pub struct RenderApi<'a> {
     active_tex: &'a mut GLuint,
     batch: &'a mut Batch,
     atlas: &'a mut Vec<Atlas>,
     current_atlas: &'a mut usize,
     program: &'a mut TextShaderProgram,
-    config: &'a Config<C>,
+    config: &'a UIConfig,
+    cursor_config: Cursor,
 }
 
 #[derive(Debug)]
@@ -730,7 +725,7 @@ impl QuadRenderer {
     }
 
     /// Draw all rectangles simultaneously to prevent excessive program swaps.
-    pub fn draw_rects(&mut self, props: &term::SizeInfo, rects: Vec<RenderRect>) {
+    pub fn draw_rects(&mut self, props: &SizeInfo, rects: Vec<RenderRect>) {
         // Swap to rectangle rendering program.
         unsafe {
             // Swap program.
@@ -783,9 +778,15 @@ impl QuadRenderer {
         }
     }
 
-    pub fn with_api<F, T, C>(&mut self, config: &Config<C>, props: &term::SizeInfo, func: F) -> T
+    pub fn with_api<F, T>(
+        &mut self,
+        config: &UIConfig,
+        cursor_config: Cursor,
+        props: &SizeInfo,
+        func: F,
+    ) -> T
     where
-        F: FnOnce(RenderApi<'_, C>) -> T,
+        F: FnOnce(RenderApi<'_>) -> T,
     {
         // Flush message queue.
         if let Ok(Msg::ShaderReload) = self.rx.try_recv() {
@@ -810,6 +811,7 @@ impl QuadRenderer {
             current_atlas: &mut self.current_atlas,
             program: &mut self.program,
             config,
+            cursor_config,
         });
 
         unsafe {
@@ -838,7 +840,7 @@ impl QuadRenderer {
         })
     }
 
-    pub fn reload_shaders(&mut self, props: &term::SizeInfo) {
+    pub fn reload_shaders(&mut self, props: &SizeInfo) {
         info!("Reloading shaders...");
         let result = (TextShaderProgram::new(), RectShaderProgram::new());
         let (program, rect_program) = match result {
@@ -888,7 +890,7 @@ impl QuadRenderer {
     /// Render a rectangle.
     ///
     /// This requires the rectangle program to be activated.
-    fn render_rect(&mut self, rect: &RenderRect, size: &term::SizeInfo) {
+    fn render_rect(&mut self, rect: &RenderRect, size: &SizeInfo) {
         // Do nothing when alpha is fully transparent.
         if rect.alpha == 0. {
             return;
@@ -923,7 +925,7 @@ impl QuadRenderer {
     }
 }
 
-impl<'a, C> RenderApi<'a, C> {
+impl<'a> RenderApi<'a> {
     pub fn clear(&self, color: Rgb) {
         unsafe {
             let alpha = self.config.background_opacity();
@@ -1046,7 +1048,7 @@ impl<'a, C> RenderApi<'a, C> {
                         self.config.font.offset.x,
                         self.config.font.offset.y,
                         cursor_key.is_wide,
-                        self.config.cursor.thickness(),
+                        self.cursor_config.thickness(),
                     ))
                 });
                 self.add_render_item(cell, glyph);
@@ -1154,7 +1156,7 @@ impl<'a> LoadGlyph for LoaderApi<'a> {
     }
 }
 
-impl<'a, C> LoadGlyph for RenderApi<'a, C> {
+impl<'a> LoadGlyph for RenderApi<'a> {
     fn load_glyph(&mut self, rasterized: &RasterizedGlyph) -> Glyph {
         load_glyph(self.active_tex, self.atlas, self.current_atlas, rasterized)
     }
@@ -1164,7 +1166,7 @@ impl<'a, C> LoadGlyph for RenderApi<'a, C> {
     }
 }
 
-impl<'a, C> Drop for RenderApi<'a, C> {
+impl<'a> Drop for RenderApi<'a> {
     fn drop(&mut self) {
         if !self.batch.is_empty() {
             self.render_batch();
@@ -1251,7 +1253,7 @@ impl TextShaderProgram {
         }
     }
 
-    fn set_term_uniforms(&self, props: &term::SizeInfo) {
+    fn set_term_uniforms(&self, props: &SizeInfo) {
         unsafe {
             gl::Uniform2f(self.u_cell_dim, props.cell_width, props.cell_height);
         }
diff --git a/alacritty/src/window.rs b/alacritty/src/window.rs
index 450329d4..89f16b7a 100644
--- a/alacritty/src/window.rs
+++ b/alacritty/src/window.rs
@@ -33,12 +33,12 @@ use glutin::{self, ContextBuilder, PossiblyCurrent, WindowedContext};
 #[cfg(windows)]
 use winapi::shared::minwindef::WORD;
 
-use alacritty_terminal::config::{Decorations, StartupMode, WindowConfig};
 #[cfg(not(windows))]
 use alacritty_terminal::index::Point;
 #[cfg(not(windows))]
 use alacritty_terminal::term::SizeInfo;
 
+use crate::config::window::{Decorations, StartupMode, WindowConfig};
 use crate::config::Config;
 use crate::gl;
 
@@ -154,7 +154,8 @@ impl Window {
         size: Option<PhysicalSize<u32>>,
         #[cfg(not(any(target_os = "macos", windows)))] wayland_event_queue: Option<&EventQueue>,
     ) -> Result<Window> {
-        let window_builder = Window::get_platform_window(&config.window.title, &config.window);
+        let window_config = &config.ui_config.window;
+        let window_builder = Window::get_platform_window(&window_config.title, &window_config);
 
         // Disable vsync on Wayland.
         #[cfg(not(any(target_os = "macos", windows)))]
@@ -180,7 +181,7 @@ impl Window {
         {
             if event_loop.is_x11() {
                 // On X11, embed the window inside another if the parent ID has been set.
-                if let Some(parent_window_id) = config.window.embed {
+                if let Some(parent_window_id) = window_config.embed {
                     x_embed_window(windowed_context.window(), parent_window_id);
                 }
             } else {
@@ -265,7 +266,7 @@ impl Window {
             .with_visible(false)
             .with_transparent(true)
             .with_decorations(decorations)
-            .with_maximized(window_config.startup_mode() == StartupMode::Maximized)
+            .with_maximized(window_config.startup_mode == StartupMode::Maximized)
             .with_window_icon(icon.ok())
             // X11.
             .with_class(class.instance.clone(), class.general.clone())
@@ -293,7 +294,7 @@ impl Window {
             .with_visible(false)
             .with_decorations(decorations)
             .with_transparent(true)
-            .with_maximized(window_config.startup_mode() == StartupMode::Maximized)
+            .with_maximized(window_config.startup_mode == StartupMode::Maximized)
             .with_window_icon(icon.ok())
     }
 
@@ -303,7 +304,7 @@ impl Window {
             .with_title(title)
             .with_visible(false)
             .with_transparent(true)
-            .with_maximized(window_config.startup_mode() == StartupMode::Maximized);
+            .with_maximized(window_config.startup_mode == StartupMode::Maximized);
 
         match window_config.decorations {
             Decorations::Full => window,
diff --git a/alacritty_terminal/Cargo.toml b/alacritty_terminal/Cargo.toml
index 3e796ba6..15edec3f 100644
--- a/alacritty_terminal/Cargo.toml
+++ b/alacritty_terminal/Cargo.toml
@@ -11,7 +11,6 @@ edition = "2018"
 [dependencies]
 libc = "0.2"
 bitflags = "1"
-font = { path = "../font", features = ["force_system_fontconfig"] }
 parking_lot = "0.10.2"
 serde = { version = "1", features = ["derive"] }
 serde_yaml = "0.8"
@@ -38,12 +37,8 @@ winapi = { version = "0.3.7", features = [
 ]}
 mio-anonymous-pipes = "0.1"
 
-[target.'cfg(target_os = "macos")'.dependencies]
-objc = "0.2.2"
-
 [features]
 default = ["winpty"]
-nightly = []
 bench = []
 
 [dev-dependencies]
diff --git a/alacritty_terminal/src/config/mod.rs b/alacritty_terminal/src/config/mod.rs
index 83dcd7b8..98579a69 100644
--- a/alacritty_terminal/src/config/mod.rs
+++ b/alacritty_terminal/src/config/mod.rs
@@ -8,19 +8,13 @@ use serde_yaml::Value;
 
 mod bell;
 mod colors;
-mod debug;
-mod font;
 mod scrolling;
-mod window;
 
 use crate::ansi::CursorStyle;
 
 pub use crate::config::bell::{BellAnimation, BellConfig};
 pub use crate::config::colors::Colors;
-pub use crate::config::debug::Debug;
-pub use crate::config::font::{Font, FontDescription};
 pub use crate::config::scrolling::Scrolling;
-pub use crate::config::window::{Decorations, Dimensions, StartupMode, WindowConfig, DEFAULT_NAME};
 
 pub const LOG_TARGET_CONFIG: &str = "alacritty_config";
 const MAX_SCROLLBACK_LINES: u32 = 100_000;
@@ -31,18 +25,10 @@ pub type MockConfig = Config<HashMap<String, serde_yaml::Value>>;
 /// Top-level config type.
 #[derive(Debug, PartialEq, Default, Deserialize)]
 pub struct Config<T> {
-    /// Pixel padding.
-    #[serde(default, deserialize_with = "failure_default")]
-    pub padding: Option<Delta<u8>>,
-
     /// TERM env variable.
     #[serde(default, deserialize_with = "failure_default")]
     pub env: HashMap<String, String>,
 
-    /// Font configuration.
-    #[serde(default, deserialize_with = "failure_default")]
-    pub font: Font,
-
     /// Should draw bold text with brighter colors instead of bold font.
     #[serde(default, deserialize_with = "failure_default")]
     draw_bold_text_with_bright_colors: bool,
@@ -50,14 +36,6 @@ pub struct Config<T> {
     #[serde(default, deserialize_with = "failure_default")]
     pub colors: Colors,
 
-    /// Background opacity from 0.0 to 1.0.
-    #[serde(default, deserialize_with = "failure_default")]
-    background_opacity: Percentage,
-
-    /// Window configuration.
-    #[serde(default, deserialize_with = "failure_default")]
-    pub window: WindowConfig,
-
     #[serde(default, deserialize_with = "failure_default")]
     pub selection: Selection,
 
@@ -73,14 +51,6 @@ pub struct Config<T> {
     #[serde(default, deserialize_with = "failure_default")]
     bell: BellConfig,
 
-    /// Use dynamic title.
-    #[serde(default, deserialize_with = "failure_default")]
-    dynamic_title: DefaultTrueBool,
-
-    /// Live config reload.
-    #[serde(default, deserialize_with = "failure_default")]
-    live_config_reload: DefaultTrueBool,
-
     /// How much scrolling history to keep.
     #[serde(default, deserialize_with = "failure_default")]
     pub scrolling: Scrolling,
@@ -94,18 +64,10 @@ pub struct Config<T> {
     #[serde(default, deserialize_with = "failure_default")]
     pub winpty_backend: bool,
 
-    /// Send escape sequences using the alt key.
-    #[serde(default, deserialize_with = "failure_default")]
-    alt_send_esc: DefaultTrueBool,
-
     /// Shell startup directory.
     #[serde(default, deserialize_with = "option_explicit_none")]
     pub working_directory: Option<PathBuf>,
 
-    /// Debug options.
-    #[serde(default, deserialize_with = "failure_default")]
-    pub debug: Debug,
-
     /// Additional configuration options not directly required by the terminal.
     #[serde(flatten)]
     pub ui_config: T,
@@ -121,14 +83,6 @@ pub struct Config<T> {
     // TODO: REMOVED
     #[serde(default, deserialize_with = "failure_default")]
     pub tabspaces: Option<usize>,
-
-    // TODO: DEPRECATED
-    #[serde(default, deserialize_with = "failure_default")]
-    pub render_timer: Option<bool>,
-
-    // TODO: DEPRECATED
-    #[serde(default, deserialize_with = "failure_default")]
-    pub persistent_logging: Option<bool>,
 }
 
 impl<T> Config<T> {
@@ -137,50 +91,6 @@ impl<T> Config<T> {
         self.draw_bold_text_with_bright_colors
     }
 
-    /// Should show render timer.
-    #[inline]
-    pub fn render_timer(&self) -> bool {
-        self.render_timer.unwrap_or(self.debug.render_timer)
-    }
-
-    /// Live config reload.
-    #[inline]
-    pub fn live_config_reload(&self) -> bool {
-        self.live_config_reload.0
-    }
-
-    #[inline]
-    pub fn set_live_config_reload(&mut self, live_config_reload: bool) {
-        self.live_config_reload.0 = live_config_reload;
-    }
-
-    #[inline]
-    pub fn dynamic_title(&self) -> bool {
-        self.dynamic_title.0
-    }
-
-    #[inline]
-    pub fn set_dynamic_title(&mut self, dynamic_title: bool) {
-        self.dynamic_title.0 = dynamic_title;
-    }
-
-    /// Send escape sequences using the alt key.
-    #[inline]
-    pub fn alt_send_esc(&self) -> bool {
-        self.alt_send_esc.0
-    }
-
-    /// Keep the log file after quitting Alacritty.
-    #[inline]
-    pub fn persistent_logging(&self) -> bool {
-        self.persistent_logging.unwrap_or(self.debug.persistent_logging)
-    }
-
-    #[inline]
-    pub fn background_opacity(&self) -> f32 {
-        self.background_opacity.0 as f32
-    }
-
     #[inline]
     pub fn bell(&self) -> &BellConfig {
         self.visual_bell.as_ref().unwrap_or(&self.bell)
@@ -294,18 +204,6 @@ impl Program {
     }
 }
 
-/// A delta for a point in a 2 dimensional plane.
-#[serde(default, bound(deserialize = "T: Deserialize<'de> + Default"))]
-#[derive(Clone, Copy, Debug, Default, Deserialize, PartialEq, Eq)]
-pub struct Delta<T: Default + PartialEq + Eq> {
-    /// Horizontal change.
-    #[serde(deserialize_with = "failure_default")]
-    pub x: T,
-    /// Vertical change.
-    #[serde(deserialize_with = "failure_default")]
-    pub y: T,
-}
-
 /// Wrapper around f32 that represents a percentage value between 0.0 and 1.0.
 #[derive(Clone, Copy, Debug, PartialEq)]
 pub struct Percentage(f32);
@@ -320,6 +218,10 @@ impl Percentage {
             value
         })
     }
+
+    pub fn as_f32(self) -> f32 {
+        self.0
+    }
 }
 
 impl Default for Percentage {
diff --git a/alacritty_terminal/src/event.rs b/alacritty_terminal/src/event.rs
index 863a2fbf..c7129b24 100644
--- a/alacritty_terminal/src/event.rs
+++ b/alacritty_terminal/src/event.rs
@@ -8,6 +8,7 @@ use crate::term::{ClipboardType, SizeInfo};
 pub enum Event {
     MouseCursorDirty,
     Title(String),
+    ResetTitle,
     ClipboardStore(ClipboardType, String),
     ClipboardLoad(ClipboardType, Arc<dyn Fn(&str) -> String + Sync + Send + 'static>),
     Wakeup,
@@ -20,6 +21,7 @@ impl Debug for Event {
         match self {
             Event::MouseCursorDirty => write!(f, "MouseCursorDirty"),
             Event::Title(title) => write!(f, "Title({})", title),
+            Event::ResetTitle => write!(f, "ResetTitle"),
             Event::ClipboardStore(ty, text) => write!(f, "ClipboardStore({:?}, {})", ty, text),
             Event::ClipboardLoad(ty, _) => write!(f, "ClipboardLoad({:?})", ty),
             Event::Wakeup => write!(f, "Wakeup"),
diff --git a/alacritty_terminal/src/event_loop.rs b/alacritty_terminal/src/event_loop.rs
index 156510b0..43e8a302 100644
--- a/alacritty_terminal/src/event_loop.rs
+++ b/alacritty_terminal/src/event_loop.rs
@@ -15,7 +15,6 @@ use mio::{self, Events, PollOpt, Ready};
 use mio_extras::channel::{self, Receiver, Sender};
 
 use crate::ansi;
-use crate::config::Config;
 use crate::event::{self, Event, EventListener};
 use crate::sync::FairMutex;
 use crate::term::{SizeInfo, Term};
@@ -155,11 +154,12 @@ where
     U: EventListener + Send + 'static,
 {
     /// Create a new event loop.
-    pub fn new<V>(
+    pub fn new(
         terminal: Arc<FairMutex<Term<U>>>,
         event_proxy: U,
         pty: T,
-        config: &Config<V>,
+        hold: bool,
+        ref_test: bool,
     ) -> EventLoop<T, U> {
         let (tx, rx) = channel::channel();
         EventLoop {
@@ -169,8 +169,8 @@ where
             rx,
             terminal,
             event_proxy,
-            hold: config.hold,
-            ref_test: config.debug.ref_test,
+            hold,
+            ref_test,
         }
     }
 
diff --git a/alacritty_terminal/src/lib.rs b/alacritty_terminal/src/lib.rs
index 7130218b..2f3beeb0 100644
--- a/alacritty_terminal/src/lib.rs
+++ b/alacritty_terminal/src/lib.rs
@@ -1,24 +1,14 @@
 //! Alacritty - The GPU Enhanced Terminal.
 
 #![deny(clippy::all, clippy::if_not_else, clippy::enum_glob_use, clippy::wrong_pub_self_convention)]
-#![cfg_attr(feature = "nightly", feature(core_intrinsics))]
 #![cfg_attr(all(test, feature = "bench"), feature(test))]
 
-#[cfg(target_os = "macos")]
-#[macro_use]
-extern crate objc;
-
 pub mod ansi;
 pub mod config;
 pub mod event;
 pub mod event_loop;
 pub mod grid;
 pub mod index;
-#[cfg(target_os = "macos")]
-pub mod locale;
-pub mod message_bar;
-pub mod meter;
-pub mod panic;
 pub mod selection;
 pub mod sync;
 pub mod term;
diff --git a/alacritty_terminal/src/term/mod.rs b/alacritty_terminal/src/term/mod.rs
index f3f22d47..5a59b55b 100644
--- a/alacritty_terminal/src/term/mod.rs
+++ b/alacritty_terminal/src/term/mod.rs
@@ -721,14 +721,8 @@ pub struct Term<T> {
     /// Current title of the window.
     title: Option<String>,
 
-    /// Default title for resetting it.
-    default_title: String,
-
-    /// Whether to permit updating the terminal title.
-    dynamic_title: bool,
-
     /// Stack of saved window titles. When a title is popped from this stack, the `title` for the
-    /// term is set, and the Glutin window's title attribute is changed through the event listener.
+    /// term is set.
     title_stack: Vec<Option<String>>,
 
     /// Current forwards and backwards buffer search regexes.
@@ -777,11 +771,9 @@ impl<T> Term<T> {
             cursor_style: None,
             default_cursor_style: config.cursor.style,
             vi_mode_cursor_style: config.cursor.vi_mode_style,
-            dynamic_title: config.dynamic_title(),
             event_proxy,
             is_focused: true,
             title: None,
-            default_title: config.window.title.clone(),
             title_stack: Vec::new(),
             selection: None,
             regex_search: None,
@@ -808,14 +800,12 @@ impl<T> Term<T> {
         self.default_cursor_style = config.cursor.style;
         self.vi_mode_cursor_style = config.cursor.vi_mode_style;
 
-        self.default_title = config.window.title.clone();
-        self.dynamic_title = config.dynamic_title();
+        let title_event = match &self.title {
+            Some(title) => Event::Title(title.clone()),
+            None => Event::ResetTitle,
+        };
 
-        if self.dynamic_title {
-            self.set_title(self.title.clone());
-        } else {
-            self.event_proxy.send_event(Event::Title(self.default_title.clone()));
-        }
+        self.event_proxy.send_event(title_event);
 
         if self.mode.contains(TermMode::ALT_SCREEN) {
             self.inactive_grid.update_history(config.scrolling.history() as usize);
@@ -2167,10 +2157,12 @@ impl<T: EventListener> Handler for Term<T> {
 
         self.title = title.clone();
 
-        if self.dynamic_title {
-            let title = title.unwrap_or_else(|| self.default_title.clone());
-            self.event_proxy.send_event(Event::Title(title));
-        }
+        let title_event = match title {
+            Some(title) => Event::Title(title),
+            None => Event::ResetTitle,
+        };
+
+        self.event_proxy.send_event(title_event);
     }
 
     #[inline]
diff --git a/alacritty_terminal/src/tty/windows/conpty.rs b/alacritty_terminal/src/tty/windows/conpty.rs
index be147b49..fa9f8b5a 100644
--- a/alacritty_terminal/src/tty/windows/conpty.rs
+++ b/alacritty_terminal/src/tty/windows/conpty.rs
@@ -125,8 +125,7 @@ pub fn new<C>(config: &Config<C>, size: &SizeInfo, _window_id: Option<usize>) ->
 
     let mut startup_info_ex: STARTUPINFOEXW = Default::default();
 
-    let title = win32_string(&config.window.title);
-    startup_info_ex.StartupInfo.lpTitle = title.as_ptr() as LPWSTR;
+    startup_info_ex.StartupInfo.lpTitle = std::ptr::null_mut() as LPWSTR;
 
     startup_info_ex.StartupInfo.cb = mem::size_of::<STARTUPINFOEXW>() as u32;