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.

1 files changed, 4 insertions, 2 deletions

diff --git a/alacritty_terminal/src/term/color.rs b/alacritty_terminal/src/term/color.rs
index 1cfdec6b..3c545b28 100644
--- a/alacritty_terminal/src/term/color.rs
+++ b/alacritty_terminal/src/term/color.rs
@@ -7,12 +7,14 @@ use serde::de::{Error as _, Visitor};
 use serde::{Deserialize, Deserializer, Serialize};
 use serde_yaml::Value;
 
+use alacritty_config_derive::SerdeReplace;
+
 use crate::ansi::NamedColor;
 
 /// Number of terminal colors.
 pub const COUNT: usize = 269;
 
-#[derive(Debug, Eq, PartialEq, Copy, Clone, Default, Serialize)]
+#[derive(SerdeReplace, Debug, Eq, PartialEq, Copy, Clone, Default, Serialize)]
 pub struct Rgb {
     pub r: u8,
     pub g: u8,
@@ -170,7 +172,7 @@ impl FromStr for Rgb {
 }
 
 /// RGB color optionally referencing the cell's foreground or background.
-#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+#[derive(SerdeReplace, Copy, Clone, Debug, PartialEq, Eq)]
 pub enum CellRgb {
     CellForeground,
     CellBackground,