From 6672fb71e4bbe6132f9a86c4f0631e3e13f0340f Mon Sep 17 00:00:00 2001
From: galister <22305755+galister@users.noreply.github.com>
Date: Wed, 24 Dec 2025 00:55:10 +0900
Subject: [PATCH] =?UTF-8?q?SetSprite=20=E2=86=92=20SetImage,=20remove=20fi?=
 =?UTF-8?q?fo=20&=20shell=20label?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 wayvr-ipc/src/packet_client.rs                |   2 +-
 wayvrctl/src/main.rs                          |   6 +-
 wlx-overlay-s/src/backend/task.rs             |   2 +-
 wlx-overlay-s/src/backend/wayvr/server_ipc.rs |   4 +-
 wlx-overlay-s/src/gui/README.md               |  41 +----
 wlx-overlay-s/src/gui/panel/button.rs         |  35 ++--
 wlx-overlay-s/src/gui/panel/helper.rs         | 118 ------------
 wlx-overlay-s/src/gui/panel/label.rs          | 172 +-----------------
 wlx-overlay-s/src/overlays/custom.rs          |   2 +-
 9 files changed, 27 insertions(+), 355 deletions(-)
 delete mode 100644 wlx-overlay-s/src/gui/panel/helper.rs

diff --git a/wayvr-ipc/src/packet_client.rs b/wayvr-ipc/src/packet_client.rs
index 0ed09ed..83d7e91 100644
--- a/wayvr-ipc/src/packet_client.rs
+++ b/wayvr-ipc/src/packet_client.rs
@@ -52,7 +52,7 @@ pub struct WlxHapticsParams {
 pub enum WlxModifyPanelCommand {
 	SetText(String),
 	SetColor(String),
-	SetSprite(String),
+	SetImage(String),
 	SetVisible(bool),
 	SetStickyState(bool),
 }
diff --git a/wayvrctl/src/main.rs b/wayvrctl/src/main.rs
index 7ecf454..cab0e56 100644
--- a/wayvrctl/src/main.rs
+++ b/wayvrctl/src/main.rs
@@ -132,7 +132,7 @@ async fn run_once(state: &mut WayVRClientState, args: Args) -> anyhow::Result<()
             let command = match command {
                 SubcommandPanelModify::SetText { text } => packet_client::WlxModifyPanelCommand::SetText(text),
                 SubcommandPanelModify::SetColor { hex_color } => packet_client::WlxModifyPanelCommand::SetColor(hex_color),
-                SubcommandPanelModify::SetSprite { absolute_path } => packet_client::WlxModifyPanelCommand::SetSprite(absolute_path),
+                SubcommandPanelModify::SetImage { absolute_path } => packet_client::WlxModifyPanelCommand::SetImage(absolute_path),
                 SubcommandPanelModify::SetVisible { visible_0_or_1 } => packet_client::WlxModifyPanelCommand::SetVisible(visible_0_or_1 != 0),
                 SubcommandPanelModify::SetStickyState { sticky_state_0_or_1 } => packet_client::WlxModifyPanelCommand::SetStickyState(sticky_state_0_or_1 != 0),
             };
@@ -266,11 +266,11 @@ enum SubcommandPanelModify {
         hex_color: String,
     },
     /// Set the content of a <sprite> or <image>. Max size for <sprite> is 256x256.
-    SetSprite {
+    SetImage {
         /// Absolute path to a svg, gif, png, jpeg or webp image.
         absolute_path: String,
     },
-    /// Set the visibility of a <div>, <rectangle>, <label> or <sprite>
+    /// Set the visibility of a <div>, <rectangle>, <label>, <sprite> or <image>
     SetVisible {
         visible_0_or_1: u8,
     },
diff --git a/wlx-overlay-s/src/backend/task.rs b/wlx-overlay-s/src/backend/task.rs
index 37cf321..cd228b9 100644
--- a/wlx-overlay-s/src/backend/task.rs
+++ b/wlx-overlay-s/src/backend/task.rs
@@ -58,7 +58,7 @@ pub enum PlayspaceTask {
 pub enum ModifyPanelCommand {
     SetText(String),
     SetColor(String),
-    SetSprite(String),
+    SetImage(String),
     SetVisible(bool),
     SetStickyState(bool),
 }
diff --git a/wlx-overlay-s/src/backend/wayvr/server_ipc.rs b/wlx-overlay-s/src/backend/wayvr/server_ipc.rs
index bd17b20..ed320d5 100644
--- a/wlx-overlay-s/src/backend/wayvr/server_ipc.rs
+++ b/wlx-overlay-s/src/backend/wayvr/server_ipc.rs
@@ -495,8 +495,8 @@ impl Connection {
                     packet_client::WlxModifyPanelCommand::SetText(text) => {
                         ModifyPanelCommand::SetText(text)
                     }
-                    packet_client::WlxModifyPanelCommand::SetSprite(sprite) => {
-                        ModifyPanelCommand::SetSprite(sprite)
+                    packet_client::WlxModifyPanelCommand::SetImage(sprite) => {
+                        ModifyPanelCommand::SetImage(sprite)
                     }
                     packet_client::WlxModifyPanelCommand::SetStickyState(sticky) => {
                         ModifyPanelCommand::SetStickyState(sticky)
diff --git a/wlx-overlay-s/src/gui/README.md b/wlx-overlay-s/src/gui/README.md
index 23bb465..d7b0cda 100644
--- a/wlx-overlay-s/src/gui/README.md
+++ b/wlx-overlay-s/src/gui/README.md
@@ -1,5 +1,9 @@
 # Custom UI Elements
 
+Elements on custom panels may be modified at runtime using `wayvrctl`.
+
+For more, refer to: `wayvrctl panel-modify --help`
+
 ### Labels
 
 #### Clock label
@@ -14,43 +18,6 @@ See the Custom Timezones section for more info on timezones. Skip `_timezone` to
 <label _source="clock" _display="time" _timezone="0" [...] />
 ```
 
-#### Fifo label
-
-Fifo label creates a fifo on your system that other programs can pipe output into.
-
-- The label will look for the last complete line to use as its text.
-- If the pipe breaks due to an IO error, re-creation is attempted after 15 seconds.
-- `_path` supports environment variables, but not `~`!
-
-```xml
-<label _source="fifo" _path="$XDG_RUNTIME_DIR/my-test-label" [...] />
-```
-
-Example script to test with:
-```bash
-for i in {0..99}; do echo "i is $i" > $XDG_RUNTIME_DIR/my-test-label; sleep 1; done
-```
-
-#### Shell Exec label
-
-This label executes a shell script using the `sh` shell.
-
-- Write lines to the script's stdout to update the label text.
-- The label will look for the last complete line to use as its text.
-- Long-running scripts are allowed, but the label is only updated while the HMD is active.
-- If the script exits successfully (code 0), it will be re-ran on the next frame. Otherwise, it will be re-ran in 15s.
-- Control the pacing from inside the script itself. For example, adding a sleep 5 will make the script execute at most once per 5 seconds.
-- `_exec` supports everything that `sh` supports!
-
-```xml
-<label _source="shell" _exec="$HOME/.local/bin/my-test-script.sh" [...] />
-```
-
-```bash
-#!/usr/bin/bash
-echo "This is my script's output!"
-```
-
 #### Battery label
 
 This is a label type that's used internally to display battery states.
diff --git a/wlx-overlay-s/src/gui/panel/button.rs b/wlx-overlay-s/src/gui/panel/button.rs
index 578b902..cdfd292 100644
--- a/wlx-overlay-s/src/gui/panel/button.rs
+++ b/wlx-overlay-s/src/gui/panel/button.rs
@@ -1,6 +1,6 @@
 use std::{
     cell::RefCell,
-    process::{Command, Stdio},
+    process::{Child, Command, Stdio},
     rc::Rc,
     str::FromStr,
     sync::{Arc, atomic::Ordering},
@@ -359,15 +359,13 @@ pub(super) fn setup_custom_button<S: 'static>(
                     carry_over: RefCell::new(None),
                 });
 
-                let piped = attribs.get_value("_update_label").is_some_and(|s| s == "1");
-
                 layout.add_event_listener::<AppState, S>(
                     attribs.widget_id,
                     EventListenerKind::InternalStateChange,
                     Box::new({
                         let state = state.clone();
-                        move |common, _data, _, _| {
-                            shell_on_tick(&state, common, piped);
+                        move |_, _, _, _| {
+                            shell_on_tick(&state);
                             Ok(EventResult::Pass)
                         }
                     }),
@@ -429,8 +427,7 @@ pub(super) fn setup_custom_button<S: 'static>(
 
 #[derive(Default)]
 struct ShellButtonMutableState {
-    reader: Option<PipeReaderThread>,
-    pid: Option<u32>,
+    child: Option<Child>,
 }
 
 struct ShellButtonState {
@@ -443,17 +440,18 @@ struct ShellButtonState {
 fn shell_on_action(state: &ShellButtonState) -> anyhow::Result<()> {
     let mut mut_state = state.mut_state.borrow_mut();
 
-    if mut_state.reader.as_ref().is_some_and(|r| !r.is_finished())
-        && let Some(pid) = mut_state.pid.as_ref()
+    if let Some(child) = mut_state.child.as_mut()
+        && let Ok(None) = child.try_wait()
     {
         log::info!("ShellExec triggered while child is still running; sending SIGUSR1");
         let _ = Command::new("kill")
             .arg("-s")
             .arg("USR1")
-            .arg(pid.to_string())
+            .arg(child.id().to_string())
             .spawn()
             .unwrap()
             .wait();
+
         return Ok(());
     }
 
@@ -464,26 +462,19 @@ fn shell_on_action(state: &ShellButtonState) -> anyhow::Result<()> {
         .spawn()
         .with_context(|| format!("Failed to run shell script: '{}'", &state.exec))?;
 
-    mut_state.pid = Some(child.id());
-    mut_state.reader = Some(PipeReaderThread::new_from_child(child));
+    mut_state.child = Some(child);
 
     Ok(())
 }
 
-fn shell_on_tick(state: &ShellButtonState, common: &mut event::CallbackDataCommon, piped: bool) {
+fn shell_on_tick(state: &ShellButtonState) {
     let mut mut_state = state.mut_state.borrow_mut();
 
-    let Some(reader) = mut_state.reader.as_mut() else {
+    let Some(child) = mut_state.child.as_mut() else {
         return;
     };
 
-    if piped && let Some(text) = reader.get_last_line() {
-        state
-            .button
-            .set_text(common, Translation::from_raw_text(&text));
-    }
-
-    if reader.is_finished() {
-        mut_state.reader = None;
+    if let Ok(Some(_)) = child.try_wait() {
+        mut_state.child = None;
     }
 }
diff --git a/wlx-overlay-s/src/gui/panel/helper.rs b/wlx-overlay-s/src/gui/panel/helper.rs
deleted file mode 100644
index a9c85fe..0000000
--- a/wlx-overlay-s/src/gui/panel/helper.rs
+++ /dev/null
@@ -1,118 +0,0 @@
-use regex::Regex;
-use std::{
-    fs,
-    io::{BufRead, BufReader},
-    process::Child,
-    sync::{
-        Arc, LazyLock,
-        mpsc::{self, Receiver},
-    },
-    thread::JoinHandle,
-};
-
-static ENV_VAR_REGEX: LazyLock<Regex> = LazyLock::new(|| {
-    Regex::new(r"\$\{([A-Z_][A-Z0-9_]*)}|\$([A-Z_][A-Z0-9_]*)").unwrap() // want panic
-});
-
-pub(super) fn expand_env_vars(template: &str) -> String {
-    ENV_VAR_REGEX
-        .replace_all(template, |caps: &regex::Captures| {
-            let var_name = caps.get(1).or_else(|| caps.get(2)).unwrap().as_str();
-            std::env::var(var_name)
-                .inspect_err(|e| log::warn!("Unable to substitute env var {var_name}: {e:?}"))
-                .unwrap_or_default()
-        })
-        .into_owned()
-}
-
-pub(super) struct PipeReaderThread {
-    receiver: Receiver<String>,
-    handle: JoinHandle<bool>,
-}
-
-impl PipeReaderThread {
-    pub fn new_from_child(mut c: Child) -> Self {
-        const BUF_LEN: usize = 128;
-        let (sender, receiver) = mpsc::sync_channel::<String>(4);
-
-        let handle = std::thread::spawn({
-            move || {
-                let stdout = c.stdout.take().unwrap();
-                let mut reader = BufReader::new(stdout);
-
-                loop {
-                    let mut buf = String::with_capacity(BUF_LEN);
-                    match reader.read_line(&mut buf) {
-                        Ok(0) => {
-                            // EOF reached
-                            break;
-                        }
-                        Ok(_) => {
-                            let _ = sender.try_send(buf);
-                        }
-                        Err(e) => {
-                            log::error!("Error reading pipe: {e:?}");
-                            break;
-                        }
-                    }
-                }
-                c.wait()
-                    .inspect_err(|e| log::error!("Failed to wait for child process: {e:?}"))
-                    .is_ok_and(|c| c.success())
-            }
-        });
-
-        Self { receiver, handle }
-    }
-
-    pub fn new_from_fifo(path: Arc<str>) -> Self {
-        const BUF_LEN: usize = 128;
-        let (sender, receiver) = mpsc::sync_channel::<String>(4);
-
-        let handle = std::thread::spawn({
-            move || {
-                let Ok(mut reader) = fs::File::open(&*path)
-                    .inspect_err(|e| {
-                        log::warn!("Failed to open fifo: {e:?}");
-                    })
-                    .map(|r| BufReader::new(r))
-                else {
-                    return false;
-                };
-
-                loop {
-                    let mut buf = String::with_capacity(BUF_LEN);
-                    match reader.read_line(&mut buf) {
-                        Ok(0) => {
-                            // EOF reached
-                            break;
-                        }
-                        Ok(_) => {
-                            let _ = sender.try_send(buf);
-                        }
-                        Err(e) => {
-                            log::error!("Error reading fifo: {e:?}");
-                            break;
-                        }
-                    }
-                }
-
-                true
-            }
-        });
-
-        Self { receiver, handle }
-    }
-
-    pub fn get_last_line(&mut self) -> Option<String> {
-        self.receiver.try_iter().last()
-    }
-
-    pub fn is_finished(&self) -> bool {
-        self.handle.is_finished()
-    }
-
-    pub fn check_success(self) -> bool {
-        self.handle.join().unwrap_or(false)
-    }
-}
diff --git a/wlx-overlay-s/src/gui/panel/label.rs b/wlx-overlay-s/src/gui/panel/label.rs
index e2c8a58..ea4b688 100644
--- a/wlx-overlay-s/src/gui/panel/label.rs
+++ b/wlx-overlay-s/src/gui/panel/label.rs
@@ -1,17 +1,7 @@
-use std::{
-    cell::RefCell,
-    fs,
-    os::unix::fs::FileTypeExt,
-    process::{Command, Stdio},
-    rc::Rc,
-    sync::Arc,
-    time::{Duration, Instant},
-};
+use std::rc::Rc;
 
-use anyhow::Context;
 use chrono::Local;
 use chrono_tz::Tz;
-use interprocess::os::unix::fifo_file::create_fifo;
 use wgui::{
     drawing,
     event::{self, EventCallback},
@@ -21,9 +11,7 @@ use wgui::{
     widget::{EventResult, label::WidgetLabel},
 };
 
-use crate::{gui::panel::helper::PipeReaderThread, state::AppState};
-
-use super::helper::expand_env_vars;
+use crate::state::AppState;
 
 #[allow(clippy::too_many_lines)]
 pub(super) fn setup_custom_label<S: 'static>(
@@ -37,42 +25,6 @@ pub(super) fn setup_custom_label<S: 'static>(
     };
 
     let callback: EventCallback<AppState, S> = match source {
-        "shell" => {
-            let Some(exec) = attribs.get_value("_exec") else {
-                log::warn!("label with shell source but no exec attribute!");
-                return;
-            };
-            let state = ShellLabelState {
-                exec: exec.to_string(),
-                mut_state: RefCell::new(PipeLabelMutableState {
-                    reader: None,
-                    next_try: Instant::now(),
-                }),
-                carry_over: RefCell::new(None),
-            };
-            Box::new(move |common, data, _, _| {
-                let _ = shell_on_tick(&state, common, data).inspect_err(|e| log::error!("{e:?}"));
-                Ok(EventResult::Pass)
-            })
-        }
-        "fifo" => {
-            let Some(path) = attribs.get_value("_path") else {
-                log::warn!("label with fifo source but no path attribute!");
-                return;
-            };
-            let state = FifoLabelState {
-                path: expand_env_vars(path).into(),
-                carry_over: RefCell::new(None),
-                mut_state: RefCell::new(PipeLabelMutableState {
-                    reader: None,
-                    next_try: Instant::now(),
-                }),
-            };
-            Box::new(move |common, data, _, _| {
-                fifo_on_tick(&state, common, data);
-                Ok(EventResult::Pass)
-            })
-        }
         "battery" => {
             let Some(device) = attribs
                 .get_value("_device")
@@ -186,126 +138,6 @@ pub(super) fn setup_custom_label<S: 'static>(
     );
 }
 
-struct PipeLabelMutableState {
-    reader: Option<PipeReaderThread>,
-    next_try: Instant,
-}
-
-struct ShellLabelState {
-    exec: String,
-    mut_state: RefCell<PipeLabelMutableState>,
-    carry_over: RefCell<Option<String>>,
-}
-
-fn shell_on_tick(
-    state: &ShellLabelState,
-    common: &mut event::CallbackDataCommon,
-    data: &mut event::CallbackData,
-) -> anyhow::Result<()> {
-    let mut mut_state = state.mut_state.borrow_mut();
-
-    if let Some(reader) = mut_state.reader.as_mut() {
-        if let Some(text) = reader.get_last_line() {
-            let label = data.obj.get_as_mut::<WidgetLabel>().unwrap();
-            label.set_text(common, Translation::from_raw_text(&text));
-        }
-
-        if reader.is_finished() && !mut_state.reader.take().unwrap().check_success() {
-            mut_state.next_try = Instant::now() + Duration::from_secs(15);
-        }
-        return Ok(());
-    } else if mut_state.next_try > Instant::now() {
-        return Ok(());
-    }
-
-    let child = Command::new("sh")
-        .arg("-c")
-        .arg(&state.exec)
-        .stdout(Stdio::piped())
-        .spawn()
-        .with_context(|| format!("Failed to run shell script: '{}'", &state.exec))?;
-
-    mut_state.reader = Some(PipeReaderThread::new_from_child(child));
-
-    Ok(())
-}
-
-struct FifoLabelState {
-    path: Arc<str>,
-    mut_state: RefCell<PipeLabelMutableState>,
-    carry_over: RefCell<Option<String>>,
-}
-
-impl FifoLabelState {
-    fn try_remove_fifo(&self) -> anyhow::Result<()> {
-        let meta = match fs::metadata(&*self.path) {
-            Ok(meta) => meta,
-            Err(e) => {
-                if fs::exists(&*self.path).unwrap_or(true) {
-                    anyhow::bail!("Could not stat existing file at {}: {e:?}", &self.path);
-                }
-                return Ok(());
-            }
-        };
-
-        if !meta.file_type().is_fifo() {
-            anyhow::bail!("Existing file at {} is not a FIFO", &self.path);
-        }
-
-        if let Err(e) = fs::remove_file(&*self.path) {
-            anyhow::bail!("Unable to remove existing FIFO at {}: {e:?}", &self.path);
-        }
-
-        Ok(())
-    }
-}
-
-impl Drop for FifoLabelState {
-    fn drop(&mut self) {
-        if let Err(e) = self.try_remove_fifo() {
-            log::debug!("{e:?}");
-        }
-    }
-}
-
-fn fifo_on_tick(
-    state: &FifoLabelState,
-    common: &mut event::CallbackDataCommon,
-    data: &mut event::CallbackData,
-) {
-    let mut mut_state = state.mut_state.borrow_mut();
-
-    let Some(reader) = mut_state.reader.as_mut() else {
-        if mut_state.next_try > Instant::now() {
-            return;
-        }
-
-        if let Err(e) = state.try_remove_fifo() {
-            mut_state.next_try = Instant::now() + Duration::from_secs(15);
-            log::warn!("Requested FIFO path is taken: {e:?}");
-            return;
-        }
-
-        if let Err(e) = create_fifo(&*state.path, 0o777) {
-            mut_state.next_try = Instant::now() + Duration::from_secs(15);
-            log::warn!("Failed to create FIFO: {e:?}");
-            return;
-        }
-
-        mut_state.reader = Some(PipeReaderThread::new_from_fifo(state.path.clone()));
-        return;
-    };
-
-    if let Some(text) = reader.get_last_line() {
-        let label = data.obj.get_as_mut::<WidgetLabel>().unwrap();
-        label.set_text(common, Translation::from_raw_text(&text));
-    }
-
-    if reader.is_finished() && !mut_state.reader.take().unwrap().check_success() {
-        mut_state.next_try = Instant::now() + Duration::from_secs(15);
-    }
-}
-
 const BAT_LOW: drawing::Color = drawing::Color::new(0.69, 0.38, 0.38, 1.);
 const BAT_NORMAL: drawing::Color = drawing::Color::new(0.55, 0.84, 0.79, 1.);
 const BAT_CHARGING: drawing::Color = drawing::Color::new(0.38, 0.50, 0.62, 1.);
diff --git a/wlx-overlay-s/src/overlays/custom.rs b/wlx-overlay-s/src/overlays/custom.rs
index 9626c72..ae8290b 100644
--- a/wlx-overlay-s/src/overlays/custom.rs
+++ b/wlx-overlay-s/src/overlays/custom.rs
@@ -112,7 +112,7 @@ fn apply_custom_command(
                 anyhow::bail!("No <label> or <Button> with such id.");
             }
         }
-        ModifyPanelCommand::SetSprite(path) => {
+        ModifyPanelCommand::SetImage(path) => {
             if let Ok(pair) = panel
                 .parser_state
                 .fetch_widget(&panel.layout.state, element)