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, 37 insertions, 1 deletions

diff --git a/alacritty_config_derive/tests/config.rs b/alacritty_config_derive/tests/config.rs
index 4828b822..bd449ff8 100644
--- a/alacritty_config_derive/tests/config.rs
+++ b/alacritty_config_derive/tests/config.rs
@@ -1,8 +1,10 @@
 use std::sync::{Arc, Mutex};
 
 use log::{Level, Log, Metadata, Record};
+use serde::Deserialize;
 
-use alacritty_config_derive::ConfigDeserialize;
+use alacritty_config::SerdeReplace as _;
+use alacritty_config_derive::{ConfigDeserialize, SerdeReplace};
 
 #[derive(ConfigDeserialize, Debug, PartialEq, Eq)]
 enum TestEnum {
@@ -63,6 +65,7 @@ struct Test2<T: Default> {
     field3: usize,
     #[config(alias = "aliased")]
     field4: u8,
+    newtype: NewType,
 }
 
 #[derive(ConfigDeserialize, Default)]
@@ -70,6 +73,9 @@ struct Test3 {
     flatty: usize,
 }
 
+#[derive(SerdeReplace, Deserialize, Default, PartialEq, Eq, Debug)]
+struct NewType(usize);
+
 #[test]
 fn config_deserialize() {
     let logger = unsafe {
@@ -159,3 +165,33 @@ impl Log for Logger {
 
     fn flush(&self) {}
 }
+
+#[test]
+fn field_replacement() {
+    let mut test = Test::default();
+
+    let value = serde_yaml::to_value(13).unwrap();
+    test.replace("nesting.field2", value).unwrap();
+
+    assert_eq!(test.nesting.field2, Some(13));
+}
+
+#[test]
+fn replace_derive() {
+    let mut test = Test::default();
+
+    let value = serde_yaml::to_value(9).unwrap();
+    test.replace("nesting.newtype", value).unwrap();
+
+    assert_eq!(test.nesting.newtype, NewType(9));
+}
+
+#[test]
+fn replace_flatten() {
+    let mut test = Test::default();
+
+    let value = serde_yaml::to_value(7).unwrap();
+    test.replace("flatty", value).unwrap();
+
+    assert_eq!(test.flatten.flatty, 7);
+}