WIP

crates/settings2/src/settings_file.rs

@@ -0,0 +1,135 @@
+use crate::{settings_store::SettingsStore, Setting};
+use anyhow::Result;
+use fs::Fs;
+use futures::{channel::mpsc, StreamExt};
+use gpui2::{AppContext, Context};
+use std::{
+    io::ErrorKind,
+    path::{Path, PathBuf},
+    str,
+    sync::Arc,
+    time::Duration,
+};
+use util::{paths, ResultExt};
+
+pub fn register<T: Setting>(cx: &mut AppContext) {
+    cx.update_global(|store: &mut SettingsStore, cx| {
+        store.register_setting::<T>(cx);
+    });
+}
+
+pub fn get<'a, T: Setting>(cx: &'a AppContext) -> &'a T {
+    cx.global::<SettingsStore>().get(None)
+}
+
+pub fn get_local<'a, T: Setting>(location: Option<(usize, &Path)>, cx: &'a AppContext) -> &'a T {
+    cx.global::<SettingsStore>().get(location)
+}
+
+pub const EMPTY_THEME_NAME: &'static str = "empty-theme";
+
+#[cfg(any(test, feature = "test-support"))]
+pub fn test_settings() -> String {
+    let mut value = crate::settings_store::parse_json_with_comments::<serde_json::Value>(
+        crate::default_settings().as_ref(),
+    )
+    .unwrap();
+    util::merge_non_null_json_value_into(
+        serde_json::json!({
+            "buffer_font_family": "Courier",
+            "buffer_font_features": {},
+            "buffer_font_size": 14,
+            "theme": EMPTY_THEME_NAME,
+        }),
+        &mut value,
+    );
+    value.as_object_mut().unwrap().remove("languages");
+    serde_json::to_string(&value).unwrap()
+}
+
+pub fn watch_config_file(
+    executor: Arc<Background>,
+    fs: Arc<dyn Fs>,
+    path: PathBuf,
+) -> mpsc::UnboundedReceiver<String> {
+    let (tx, rx) = mpsc::unbounded();
+    executor
+        .spawn(async move {
+            let events = fs.watch(&path, Duration::from_millis(100)).await;
+            futures::pin_mut!(events);
+
+            let contents = fs.load(&path).await.unwrap_or_default();
+            if tx.unbounded_send(contents).is_err() {
+                return;
+            }
+
+            loop {
+                if events.next().await.is_none() {
+                    break;
+                }
+
+                if let Ok(contents) = fs.load(&path).await {
+                    if !tx.unbounded_send(contents).is_ok() {
+                        break;
+                    }
+                }
+            }
+        })
+        .detach();
+    rx
+}
+
+pub fn handle_settings_file_changes(
+    mut user_settings_file_rx: mpsc::UnboundedReceiver<String>,
+    cx: &mut AppContext,
+) {
+    let user_settings_content = cx.background().block(user_settings_file_rx.next()).unwrap();
+    cx.update_global(|store: &mut SettingsStore, cx| {
+        store
+            .set_user_settings(&user_settings_content, cx)
+            .log_err();
+    });
+    cx.spawn(move |mut cx| async move {
+        while let Some(user_settings_content) = user_settings_file_rx.next().await {
+            cx.update(|cx| {
+                cx.update_global(|store: &mut SettingsStore, cx| {
+                    store
+                        .set_user_settings(&user_settings_content, cx)
+                        .log_err();
+                });
+                cx.refresh_windows();
+            });
+        }
+    })
+    .detach();
+}
+
+async fn load_settings(fs: &Arc<dyn Fs>) -> Result<String> {
+    match fs.load(&paths::SETTINGS).await {
+        result @ Ok(_) => result,
+        Err(err) => {
+            if let Some(e) = err.downcast_ref::<std::io::Error>() {
+                if e.kind() == ErrorKind::NotFound {
+                    return Ok(crate::initial_user_settings_content().to_string());
+                }
+            }
+            return Err(err);
+        }
+    }
+}
+
+pub fn update_settings_file<T: Setting>(
+    fs: Arc<dyn Fs>,
+    cx: &mut AppContext,
+    update: impl 'static + Send + FnOnce(&mut T::FileContent),
+) {
+    cx.spawn(|cx| async move {
+        let old_text = load_settings(&fs).await;
+        let new_text = cx.read_global(|store: &SettingsStore, cx| {
+            store.new_text_for_update::<T>(old_text, update)
+        });
+        fs.atomic_write(paths::SETTINGS.clone(), new_text).await?;
+        anyhow::Ok(())
+    })
+    .detach_and_log_err(cx);
+}