Add IPC config subcommand

This patch adds a new mechanism for changing configuration options
without editing the configuration file, by sending options to running
instances through `alacritty msg`.

Each window will load Alacritty's configuration file by default and then
accept IPC messages for config updates using the `alacritty msg config`
subcommand. By default all windows will be updated, individual windows
can be addressed using `alacritty msg config --window-id
"$ALACRITTY_WINDOW_ID"`.

Each option will replace the config's current value and cannot be reset
until Alacritty is restarted or the option is overwritten with a new
value.

Configuration options are passed in the format `field.subfield=value`,
where `value` is interpreted as yaml.

Closes #472.

4 files changed, 12 insertions, 12 deletions

diff --git a/alacritty/src/config/bindings.rs b/alacritty/src/config/bindings.rs
index c48b2d75..72ea88b2 100644
--- a/alacritty/src/config/bindings.rs
+++ b/alacritty/src/config/bindings.rs
@@ -9,7 +9,7 @@ use serde::de::{self, Error as SerdeError, MapAccess, Unexpected, Visitor};
 use serde::{Deserialize, Deserializer};
 use serde_yaml::Value as SerdeValue;
 
-use alacritty_config_derive::ConfigDeserialize;
+use alacritty_config_derive::{ConfigDeserialize, SerdeReplace};
 
 use alacritty_terminal::config::Program;
 use alacritty_terminal::term::TermMode;
@@ -1191,7 +1191,7 @@ impl<'a> Deserialize<'a> for KeyBinding {
 ///
 /// Our deserialize impl wouldn't be covered by a derive(Deserialize); see the
 /// impl below.
-#[derive(Debug, Copy, Clone, Hash, Default, Eq, PartialEq)]
+#[derive(SerdeReplace, Debug, Copy, Clone, Hash, Default, Eq, PartialEq)]
 pub struct ModsWrapper(pub ModifiersState);
 
 impl ModsWrapper {
diff --git a/alacritty/src/config/font.rs b/alacritty/src/config/font.rs
index d3431171..9c431b15 100644
--- a/alacritty/src/config/font.rs
+++ b/alacritty/src/config/font.rs
@@ -4,7 +4,7 @@ use crossfont::Size as FontSize;
 use serde::de::{self, Visitor};
 use serde::{Deserialize, Deserializer};
 
-use alacritty_config_derive::ConfigDeserialize;
+use alacritty_config_derive::{ConfigDeserialize, SerdeReplace};
 
 use crate::config::ui_config::Delta;
 
@@ -129,7 +129,7 @@ impl SecondaryFontDescription {
     }
 }
 
-#[derive(Debug, Clone, PartialEq, Eq)]
+#[derive(SerdeReplace, Debug, Clone, PartialEq, Eq)]
 struct Size(FontSize);
 
 impl Default for Size {
diff --git a/alacritty/src/config/ui_config.rs b/alacritty/src/config/ui_config.rs
index 28139d27..a332b737 100644
--- a/alacritty/src/config/ui_config.rs
+++ b/alacritty/src/config/ui_config.rs
@@ -9,7 +9,7 @@ use serde::de::{Error as SerdeError, MapAccess, Visitor};
 use serde::{self, Deserialize, Deserializer};
 use unicode_width::UnicodeWidthChar;
 
-use alacritty_config_derive::ConfigDeserialize;
+use alacritty_config_derive::{ConfigDeserialize, SerdeReplace};
 use alacritty_terminal::config::{
     Config as TerminalConfig, Percentage, Program, LOG_TARGET_CONFIG,
 };
@@ -30,7 +30,7 @@ use crate::config::window::WindowConfig;
 const URL_REGEX: &str = "(ipfs:|ipns:|magnet:|mailto:|gemini:|gopher:|https:|http:|news:|file:|git:|ssh:|ftp:)\
                          [^\u{0000}-\u{001F}\u{007F}-\u{009F}<>\"\\s{-}\\^⟨⟩`]+";
 
-#[derive(ConfigDeserialize, Debug, PartialEq)]
+#[derive(ConfigDeserialize, Clone, Debug, PartialEq)]
 pub struct UiConfig {
     /// Font configuration.
     pub font: Font,
@@ -145,7 +145,7 @@ impl UiConfig {
     }
 }
 
-#[derive(Debug, PartialEq, Eq)]
+#[derive(SerdeReplace, Clone, Debug, PartialEq, Eq)]
 struct KeyBindings(Vec<KeyBinding>);
 
 impl Default for KeyBindings {
@@ -163,7 +163,7 @@ impl<'de> Deserialize<'de> for KeyBindings {
     }
 }
 
-#[derive(Debug, PartialEq, Eq)]
+#[derive(SerdeReplace, Clone, Debug, PartialEq, Eq)]
 struct MouseBindings(Vec<MouseBinding>);
 
 impl Default for MouseBindings {
@@ -223,7 +223,7 @@ pub struct Delta<T: Default> {
 }
 
 /// Regex terminal hints.
-#[derive(ConfigDeserialize, Debug, PartialEq, Eq)]
+#[derive(ConfigDeserialize, Clone, Debug, PartialEq, Eq)]
 pub struct Hints {
     /// Characters for the hint labels.
     alphabet: HintsAlphabet,
@@ -273,7 +273,7 @@ impl Hints {
     }
 }
 
-#[derive(Clone, Debug, PartialEq, Eq)]
+#[derive(SerdeReplace, Clone, Debug, PartialEq, Eq)]
 struct HintsAlphabet(String);
 
 impl Default for HintsAlphabet {
diff --git a/alacritty/src/config/window.rs b/alacritty/src/config/window.rs
index 80df87b7..5d63d60f 100644
--- a/alacritty/src/config/window.rs
+++ b/alacritty/src/config/window.rs
@@ -6,7 +6,7 @@ use log::{error, warn};
 use serde::de::{self, MapAccess, Visitor};
 use serde::{Deserialize, Deserializer, Serialize};
 
-use alacritty_config_derive::ConfigDeserialize;
+use alacritty_config_derive::{ConfigDeserialize, SerdeReplace};
 use alacritty_terminal::config::{Percentage, LOG_TARGET_CONFIG};
 use alacritty_terminal::index::Column;
 
@@ -201,7 +201,7 @@ pub struct Dimensions {
 }
 
 /// Window class hint.
-#[derive(Serialize, Debug, Clone, PartialEq, Eq)]
+#[derive(SerdeReplace, Serialize, Debug, Clone, PartialEq, Eq)]
 pub struct Class {
     pub general: String,
     pub instance: String,