feat(custom): progress bar widget.

Resolves partially #68.

src/modules/custom/mod.rs

@@ -2,6 +2,7 @@ mod r#box;
 mod button;
 mod image;
 mod label;
+mod progress;
 mod slider;
 
 use self::image::ImageWidget;
@@ -10,6 +11,7 @@ use self::r#box::BoxWidget;
 use self::slider::SliderWidget;
 use crate::config::CommonConfig;
 use crate::modules::custom::button::ButtonWidget;
+use crate::modules::custom::progress::ProgressWidget;
 use crate::modules::{Module, ModuleInfo, ModuleUpdateEvent, ModuleWidget, WidgetContext};
 use crate::popup::WidgetGeometry;
 use crate::script::Script;
@@ -52,6 +54,7 @@ pub enum Widget {
     Button(ButtonWidget),
     Image(ImageWidget),
     Slider(SliderWidget),
+    Progress(ProgressWidget),
 }
 
 #[derive(Clone, Copy)]
@@ -76,6 +79,7 @@ impl Widget {
             Widget::Button(widget) => parent.add(&widget.into_widget(context)),
             Widget::Image(widget) => parent.add(&widget.into_widget(context)),
             Widget::Slider(widget) => parent.add(&widget.into_widget(context)),
+            Widget::Progress(widget) => parent.add(&widget.into_widget(context)),
         }
     }
 }

src/modules/custom/progress.rs

@@ -0,0 +1,93 @@
+use super::{try_get_orientation, CustomWidget, CustomWidgetContext};
+use crate::dynamic_string::DynamicString;
+use crate::script::{OutputStream, Script, ScriptInput};
+use crate::send;
+use gtk::prelude::*;
+use gtk::{Orientation, ProgressBar};
+use serde::Deserialize;
+use tokio::spawn;
+use tracing::error;
+
+#[derive(Debug, Deserialize, Clone)]
+pub struct ProgressWidget {
+    name: Option<String>,
+    class: Option<String>,
+    orientation: Option<String>,
+    label: Option<String>,
+    value: Option<ScriptInput>,
+    #[serde(default = "default_max")]
+    max: f64,
+    length: Option<i32>,
+}
+
+const fn default_max() -> f64 {
+    100.0
+}
+
+// TODO: Reduce duplication with slider, other widgets.
+impl CustomWidget for ProgressWidget {
+    type Widget = ProgressBar;
+
+    fn into_widget(self, context: CustomWidgetContext) -> Self::Widget {
+        let mut builder = ProgressBar::builder();
+
+        if let Some(name) = self.name {
+            builder = builder.name(name);
+        }
+
+        if let Some(orientation) = self.orientation {
+            builder = builder
+                .orientation(try_get_orientation(&orientation).unwrap_or(context.bar_orientation));
+        }
+
+        if let Some(length) = self.length {
+            builder = match context.bar_orientation {
+                Orientation::Horizontal => builder.width_request(length),
+                Orientation::Vertical => builder.height_request(length),
+                _ => builder,
+            }
+        }
+
+        let progress = builder.build();
+
+        if let Some(class) = self.class {
+            progress.style_context().add_class(&class);
+        }
+
+        if let Some(value) = self.value {
+            let script = Script::from(value);
+            let progress = progress.clone();
+
+            let (tx, rx) = glib::MainContext::channel(glib::PRIORITY_DEFAULT);
+
+            spawn(async move {
+                script
+                    .run(None, move |stream, _success| match stream {
+                        OutputStream::Stdout(out) => match out.parse::<f64>() {
+                            Ok(value) => send!(tx, value),
+                            Err(err) => error!("{err:?}"),
+                        },
+                        OutputStream::Stderr(err) => error!("{err:?}"),
+                    })
+                    .await;
+            });
+
+            rx.attach(None, move |value| {
+                progress.set_fraction(value / self.max);
+                Continue(true)
+            });
+        }
+
+        if let Some(text) = self.label {
+            let progress = progress.clone();
+            progress.set_show_text(true);
+
+            DynamicString::new(&text, move |string| {
+                progress.set_text(Some(&string));
+                Continue(true)
+            });
+        }
+
+        progress
+    }
+}

src/modules/custom/slider.rs

@@ -1,4 +1,4 @@
-use crate::modules::custom::{try_get_orientation, CustomWidget, CustomWidgetContext, ExecEvent};
+use super::{try_get_orientation, CustomWidget, CustomWidgetContext, ExecEvent};
 use crate::popup::Popup;
 use crate::script::{OutputStream, Script, ScriptInput};
 use crate::{send, try_send};