feat(ipc): support for injecting additional stylesheets

src/ipc/commands.rs

@@ -27,4 +27,11 @@ pub enum Command {
         /// Variable key.
         key: Box<str>,
     },
+
+    /// Load an additional CSS stylesheet.
+    /// The sheet is automatically hot-reloaded.
+    LoadCss {
+        /// The path to the sheet.
+        path: PathBuf,
+    },
 }

src/ipc/server.rs

@@ -2,6 +2,7 @@ use super::Ipc;
 use crate::bridge_channel::BridgeChannel;
 use crate::ipc::{Command, Response};
 use crate::ironvar::get_variable_manager;
+use crate::style::load_css;
 use crate::{read_lock, send_async, try_send, write_lock};
 use color_eyre::{Report, Result};
 use glib::Continue;
@@ -106,7 +107,7 @@ impl Ipc {
             Command::Inspect => {
                 gtk::Window::set_interactive_debugging(true);
                 Response::Ok
-            },
+            }
             Command::Set { key, value } => {
                 let variable_manager = get_variable_manager();
                 let mut variable_manager = write_lock!(variable_manager);
@@ -123,6 +124,14 @@ impl Ipc {
                     None => Response::error("Variable not found"),
                 }
             }
+            Command::LoadCss { path } => {
+                if path.exists() {
+                    load_css(path);
+                    Response::Ok
+                } else {
+                    Response::error("File not found")
+                }
+            }
             Command::Ping => Response::Ok,
         }
     }

src/style.rs

@@ -1,6 +1,7 @@
 use crate::send;
 use color_eyre::{Help, Report};
 use glib::Continue;
+use gtk::ffi::GTK_STYLE_PROVIDER_PRIORITY_USER;
 use gtk::prelude::CssProviderExt;
 use gtk::{gdk, gio, CssProvider, StyleContext};
 use notify::event::{DataChange, ModifyKind};
@@ -29,7 +30,11 @@ pub fn load_css(style_path: PathBuf) {
     };
 
     let screen = gdk::Screen::default().expect("Failed to get default GTK screen");
-    StyleContext::add_provider_for_screen(&screen, &provider, 800);
+    StyleContext::add_provider_for_screen(
+        &screen,
+        &provider,
+        GTK_STYLE_PROVIDER_PRIORITY_USER as u32,
+    );
 
     let (tx, rx) = glib::MainContext::channel(glib::PRIORITY_DEFAULT);