Save output state on disconnect

api/lua/output.lua

@@ -1,5 +1,7 @@
 -- SPDX-License-Identifier: GPL-3.0-or-later
 
+---@diagnostic disable:redefined-local
+
 ---Output management.
 ---
 ---An output is what you would call a monitor. It presents windows, your cursor, and other UI elements.
@@ -164,12 +166,7 @@ local function set_loc_horizontal(op1, op2, left_or_right, alignment)
     local other_loc = op2:loc()
     local other_res = op2:res()
 
-    if
-        self_loc == nil
-        or self_res == nil
-        or other_loc == nil
-        or other_res == nil
-    then
+    if self_loc == nil or self_res == nil or other_loc == nil or other_res == nil then
         return
     end
 
@@ -184,15 +181,9 @@ local function set_loc_horizontal(op1, op2, left_or_right, alignment)
     if alignment == "top" then
         output_module.set_loc(op1, { x = x, y = other_loc.y })
     elseif alignment == "center" then
-        output_module.set_loc(
-            op1,
-            { x = x, y = other_loc.y + (other_res.h - self_res.h) // 2 }
-        )
+        output_module.set_loc(op1, { x = x, y = other_loc.y + (other_res.h - self_res.h) // 2 })
     elseif alignment == "bottom" then
-        output_module.set_loc(
-            op1,
-            { x = x, y = other_loc.y + (other_res.h - self_res.h) }
-        )
+        output_module.set_loc(op1, { x = x, y = other_loc.y + (other_res.h - self_res.h) })
     end
 end
 
@@ -243,12 +234,7 @@ local function set_loc_vertical(op1, op2, top_or_bottom, alignment)
     local other_loc = op2:loc()
     local other_res = op2:res()
 
-    if
-        self_loc == nil
-        or self_res == nil
-        or other_loc == nil
-        or other_res == nil
-    then
+    if self_loc == nil or self_res == nil or other_loc == nil or other_res == nil then
         return
     end
 
@@ -263,15 +249,9 @@ local function set_loc_vertical(op1, op2, top_or_bottom, alignment)
     if alignment == "left" then
         output_module.set_loc(op1, { x = other_loc.x, y = y })
     elseif alignment == "center" then
-        output_module.set_loc(
-            op1,
-            { x = other_loc.x + (other_res.w - self_res.w) // 2, y = y }
-        )
+        output_module.set_loc(op1, { x = other_loc.x + (other_res.w - self_res.w) // 2, y = y })
     elseif alignment == "right" then
-        output_module.set_loc(
-            op1,
-            { x = other_loc.x + (other_res.w - self_res.w), y = y }
-        )
+        output_module.set_loc(op1, { x = other_loc.x + (other_res.w - self_res.w), y = y })
     end
 end
 
@@ -424,6 +404,11 @@ end
 ---When called, `connect_for_all` will immediately run `func` with all currently connected outputs.
 ---If a new output is connected, `func` will also be called with it.
 ---
+---This will *not* be called if it has already been called for a given connector.
+---This means turning your monitor off and on or unplugging and replugging it *to the same port*
+---won't trigger `func`. Plugging it in to a new port *will* trigger `func`.
+---This is intended to prevent duplicate setup.
+---
 ---Please note: this function will be run *after* Pinnacle processes your entire config.
 ---For example, if you define tags in `func` but toggle them directly after `connect_for_all`, nothing will happen as the tags haven't been added yet.
 ---@param func fun(output: Output) The function that will be run.

src/backend/udev.rs

@@ -88,7 +88,11 @@ use smithay_drm_extras::{
 };
 
 use crate::{
-    config::api::msg::{Args, OutgoingMsg},
+    config::{
+        api::msg::{Args, OutgoingMsg},
+        ConnectorSavedState,
+    },
+    output::OutputName,
     render::{pointer::PointerElement, take_presentation_feedback, CustomRenderElements},
     state::{Backend, CalloopData, State, SurfaceDmabufFeedback, WithState},
     window::WindowElement,
@@ -828,6 +832,15 @@ impl State {
             .unwrap_or_else(|| ("Unknown".into(), "Unknown".into()));
 
         let (phys_w, phys_h) = connector.size().unwrap_or((0, 0));
+
+        if self.space.outputs().any(|op| {
+            op.user_data()
+                .get::<UdevOutputId>()
+                .is_some_and(|op_id| op_id.crtc == crtc)
+        }) {
+            return;
+        }
+
         let output = Output::new(
             output_name,
             PhysicalProperties {
@@ -946,7 +959,18 @@ impl State {
         self.schedule_initial_render(node, crtc, self.loop_handle.clone());
 
         // Run any connected callbacks
+        if let Some(saved_state) = self
+            .config
+            .connector_saved_states
+            .get(&OutputName(output.name()))
         {
+            let ConnectorSavedState { loc, tags } = saved_state;
+
+            output.change_current_state(None, None, None, Some(*loc));
+            self.space.map_output(&output, *loc);
+
+            output.with_state(|state| state.tags = tags.clone());
+        } else {
             let clone = output.clone();
             self.schedule(
                 |dt| dt.state.api_state.stream.is_some(),
@@ -982,6 +1006,8 @@ impl State {
         _connector: connector::Info,
         crtc: crtc::Handle,
     ) {
+        tracing::debug!(?crtc, "connector_disconnected");
+
         let Backend::Udev(backend) = &mut self.backend else {
             unreachable!()
         };
@@ -1006,6 +1032,13 @@ impl State {
             .cloned();
 
         if let Some(output) = output {
+            self.config.connector_saved_states.insert(
+                OutputName(output.name()),
+                ConnectorSavedState {
+                    loc: output.current_location(),
+                    tags: output.with_state(|state| state.tags.clone()),
+                },
+            );
             self.space.unmap_output(&output);
         }
     }

src/config.rs

@@ -1,13 +1,21 @@
 pub mod api;
 
-use crate::config::api::{msg::ModifierMask, PinnacleSocketSource};
+use crate::{
+    config::api::{msg::ModifierMask, PinnacleSocketSource},
+    output::OutputName,
+    tag::Tag,
+};
 use std::{
+    collections::HashMap,
     path::{Path, PathBuf},
     sync::{Arc, Mutex},
 };
 
 use anyhow::Context;
-use smithay::input::keyboard::keysyms;
+use smithay::{
+    input::keyboard::keysyms,
+    utils::{Logical, Point},
+};
 use toml::Table;
 
 use api::msg::Modifier;
@@ -115,8 +123,18 @@ pub enum Key {
 pub struct Config {
     pub window_rules: Vec<(WindowRuleCondition, WindowRule)>,
     pub output_callback_ids: Vec<CallbackId>,
+    pub connector_saved_states: HashMap<OutputName, ConnectorSavedState>,
 }
 
+/// State saved when an output is disconnected. When the output is reconnected to the same
+/// connector, the saved state will apply to restore its state.
+#[derive(Debug, Default, Clone)]
+pub struct ConnectorSavedState {
+    pub loc: Point<i32, Logical>,
+    pub tags: Vec<Tag>,
+}
+
+/// Parse a metaconfig file in `config_dir`, if any.
 fn parse(config_dir: &Path) -> anyhow::Result<Metaconfig> {
     let config_dir = config_dir.join("metaconfig.toml");
 
@@ -126,6 +144,8 @@ fn parse(config_dir: &Path) -> anyhow::Result<Metaconfig> {
     toml::from_str(&metaconfig).context("Failed to deserialize toml")
 }
 
+/// Get the config dir. This is $PINNACLE_CONFIG_DIR, then $XDG_CONFIG_HOME/pinnacle,
+/// then ~/.config/pinnacle.
 pub fn get_config_dir() -> PathBuf {
     let config_dir = std::env::var("PINNACLE_CONFIG_DIR")
         .ok()
@@ -135,6 +155,9 @@ pub fn get_config_dir() -> PathBuf {
 }
 
 impl State {
+    /// Start the config in `config_dir`.
+    ///
+    /// If this method is called while a config is already running, it will be replaced.
     pub fn start_config(&mut self, config_dir: impl AsRef<Path>) -> anyhow::Result<()> {
         let config_dir = config_dir.as_ref();
 
@@ -154,7 +177,6 @@ impl State {
         self.config.window_rules.clear();
 
         tracing::debug!("Killing old config");
-
         if let Some(channel) = self.api_state.kill_channel.as_ref() {
             if let Err(err) = futures_lite::future::block_on(channel.send(())) {
                 tracing::warn!("failed to send kill ping to config future: {err}");
@@ -290,12 +312,12 @@ impl State {
             Second,
         }
 
+        // We can't get at the child while it's in the executor, so in order to kill it we need a
+        // channel that, when notified, will cause the child to be dropped and terminated.
         self.async_scheduler.schedule(async move {
             let which = futures_lite::future::race(
                 async move {
-                    tracing::debug!("awaiting child");
                     let _ = child.status().await;
-                    tracing::debug!("child ded");
                     Either::First
                 },
                 async move {

src/config/api/msg.rs

@@ -95,7 +95,7 @@ pub enum Msg {
     },
     AddTags {
         /// The name of the output you want these tags on.
-        output_name: String,
+        output_name: OutputName,
         tag_names: Vec<String>,
     },
     RemoveTags {

src/output.rs

@@ -9,7 +9,7 @@ use crate::{
     tag::Tag,
 };
 
-#[derive(Debug, Clone, serde::Serialize, serde::Deserialize, PartialEq, Eq)]
+#[derive(Debug, Hash, Clone, serde::Serialize, serde::Deserialize, PartialEq, Eq)]
 pub struct OutputName(pub String);
 
 impl OutputName {

src/state/api_handlers.rs

@@ -11,8 +11,11 @@ use smithay::{
 };
 
 use crate::{
-    config::api::msg::{
-        Args, CallbackId, KeyIntOrString, Msg, OutgoingMsg, Request, RequestId, RequestResponse,
+    config::{
+        api::msg::{
+            Args, CallbackId, KeyIntOrString, Msg, OutgoingMsg, Request, RequestId, RequestResponse,
+        },
+        ConnectorSavedState,
     },
     focus::FocusTarget,
     tag::Tag,
@@ -267,12 +270,27 @@ impl State {
                 output_name,
                 tag_names,
             } => {
+                let new_tags = tag_names.into_iter().map(Tag::new).collect::<Vec<_>>();
+                if let Some(saved_state) = self.config.connector_saved_states.get_mut(&output_name)
+                {
+                    let mut tags = saved_state.tags.clone();
+                    tags.extend(new_tags.clone());
+                    saved_state.tags = tags;
+                } else {
+                    self.config.connector_saved_states.insert(
+                        output_name.clone(),
+                        ConnectorSavedState {
+                            tags: new_tags.clone(),
+                            ..Default::default()
+                        },
+                    );
+                }
+
                 if let Some(output) = self
                     .space
                     .outputs()
-                    .find(|output| output.name() == output_name)
+                    .find(|output| output.name() == output_name.0)
                 {
-                    let new_tags = tag_names.into_iter().map(Tag::new).collect::<Vec<_>>();
                     output.with_state(|state| {
                         state.tags.extend(new_tags.clone());
                         tracing::debug!("tags added, are now {:?}", state.tags);
@@ -294,8 +312,15 @@ impl State {
                 }
             }
             Msg::RemoveTags { tag_ids } => {
-                let tags = tag_ids.into_iter().filter_map(|tag_id| tag_id.tag(self));
+                let tags = tag_ids
+                    .into_iter()
+                    .filter_map(|tag_id| tag_id.tag(self))
+                    .collect::<Vec<_>>();
+
                 for tag in tags {
+                    for saved_state in self.config.connector_saved_states.values_mut() {
+                        saved_state.tags.retain(|tg| tg != &tag);
+                    }
                     let Some(output) = tag.output(self) else { continue };
                     output.with_state(|state| {
                         state.tags.retain(|tg| tg != &tag);
@@ -331,6 +356,24 @@ impl State {
                 self.config.output_callback_ids.push(callback_id);
             }
             Msg::SetOutputLocation { output_name, x, y } => {
+                if let Some(saved_state) = self.config.connector_saved_states.get_mut(&output_name)
+                {
+                    if let Some(x) = x {
+                        saved_state.loc.x = x;
+                    }
+                    if let Some(y) = y {
+                        saved_state.loc.y = y;
+                    }
+                } else {
+                    self.config.connector_saved_states.insert(
+                        output_name.clone(),
+                        ConnectorSavedState {
+                            loc: (x.unwrap_or_default(), y.unwrap_or_default()).into(),
+                            ..Default::default()
+                        },
+                    );
+                }
+
                 let Some(output) = output_name.output(self) else { return };
                 let mut loc = output.current_location();
                 if let Some(x) = x {

src/window/window_state.rs

@@ -327,7 +327,6 @@ impl WindowElementState {
 impl Default for WindowElementState {
     fn default() -> Self {
         Self {
-            // INFO: I think this will assign the id on use of the state, not on window spawn.
             id: WindowId::next(),
             loc_request_state: LocationRequestState::Idle,
             tags: vec![],