commit 3cbd81219bd19c0d9347f20661163bbd4bfa128c
Author: elkowar <5300871+elkowar@users.noreply.github.com>
Date:   Sat Sep 19 11:12:24 2020 +0200

    init

diff --git a/.gitignore b/.gitignore
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diff --git a/Cargo.lock b/Cargo.lock
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..cc7bf6c
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,27 @@
+[package]
+name = "eww"
+version = "0.1.0"
+authors = ["elkowar <5300871+elkowar@users.noreply.github.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+gtk = { version = "0.9", features = [ "v3_16" ] }
+gdk = { version = "", features = ["v3_16"] }
+gio = { version = "", features = ["v2_44"] }
+
+
+hocon = { version = "0.3", features = [ "serde-support" ]}
+
+try_match = "0.2.2"
+
+anyhow = "1.0"
+#thiserror = "1.0"
+
+
+[target.x86_64-unknown-linux-gnu]
+rustflags = [
+    "-C", "link-arg=-fuse-ld=lld",
+]
+
diff --git a/src/config/hocon_ext.rs b/src/config/hocon_ext.rs
new file mode 100644
index 0000000..ef90d3b
--- /dev/null
+++ b/src/config/hocon_ext.rs
@@ -0,0 +1,24 @@
+use hocon::Hocon;
+use std::collections::HashMap;
+
+pub trait HoconExt: Sized {
+    fn as_hash(&self) -> Option<&HashMap<String, Self>>;
+    fn as_array(&self) -> Option<&Vec<Self>>;
+}
+
+impl HoconExt for Hocon {
+    // TODO take owned self here?
+
+    fn as_hash(&self) -> Option<&HashMap<String, Self>> {
+        match self {
+            Hocon::Hash(x) => Some(x),
+            _ => None,
+        }
+    }
+    fn as_array(&self) -> Option<&Vec<Self>> {
+        match self {
+            Hocon::Array(x) => Some(x),
+            _ => None,
+        }
+    }
+}
diff --git a/src/config/mod.rs b/src/config/mod.rs
new file mode 100644
index 0000000..ec7bda2
--- /dev/null
+++ b/src/config/mod.rs
@@ -0,0 +1,173 @@
+use anyhow::*;
+use hocon::*;
+use hocon_ext::HoconExt;
+use std::collections::HashMap;
+use try_match::try_match;
+
+pub mod hocon_ext;
+
+#[derive(Debug, PartialEq)]
+pub struct WidgetDefinition {
+    pub name: String,
+    pub structure: ElementUse,
+}
+
+#[derive(Debug, PartialEq)]
+pub enum ElementUse {
+    Widget(WidgetUse),
+    Text(String),
+}
+
+#[derive(Debug, PartialEq)]
+pub struct WidgetUse {
+    pub name: String,
+    pub children: Vec<ElementUse>,
+    pub num_attrs: HashMap<String, f64>,
+    pub str_attrs: HashMap<String, String>,
+}
+
+impl WidgetUse {
+    pub fn new(name: String, children: Vec<ElementUse>) -> Self {
+        WidgetUse {
+            name,
+            children,
+            num_attrs: HashMap::new(),
+            str_attrs: HashMap::new(),
+        }
+    }
+}
+
+impl From<WidgetUse> for ElementUse {
+    fn from(other: WidgetUse) -> ElementUse {
+        ElementUse::Widget(other)
+    }
+}
+
+pub fn parse_widget_definition(text: &str) -> Result<WidgetDefinition> {
+    let hocon = parse_hocon(text)?;
+
+    let definition = hocon
+        .as_hash()
+        .ok_or_else(|| anyhow!("{:?} is not a hash", text))?;
+
+    Ok(WidgetDefinition {
+        name: definition["name"]
+            .as_string()
+            .context("name was not a string")?,
+        structure: parse_element_use(definition.get("structure").unwrap().clone())?,
+    })
+}
+
+pub fn parse_element_use(hocon: Hocon) -> Result<ElementUse> {
+    match hocon {
+        Hocon::String(s) => Ok(ElementUse::Text(s)),
+        Hocon::Hash(hash) => parse_widget_use(hash).map(ElementUse::Widget),
+        _ => Err(anyhow!("{:?} is not a valid element", hocon)),
+    }
+}
+
+pub fn parse_widget_use(data: HashMap<String, Hocon>) -> Result<WidgetUse> {
+    let (widget_name, widget_config) = data.into_iter().next().unwrap();
+    let widget_config = widget_config.as_hash().unwrap();
+
+    // TODO allow for `layout_horizontal: [ elements ]` shorthand
+
+    let children = match &widget_config.get("children") {
+        Some(Hocon::String(text)) => Ok(vec![ElementUse::Text(text.to_string())]),
+        Some(Hocon::Array(children)) => children
+            .clone()
+            .into_iter()
+            .map(parse_element_use)
+            .collect::<Result<Vec<_>>>(),
+        None => Ok(Vec::new()),
+        _ => Err(anyhow!(
+            "children must be either a list of elements or a string, but was {:?}"
+        )),
+    }?;
+
+    let str_attrs: HashMap<String, String> = widget_config
+        .into_iter()
+        .filter_map(|(key, value)| {
+            Some((
+                key.clone(),
+                try_match!(Hocon::String(x) = value).ok()?.clone(),
+            ))
+        })
+        .collect();
+
+    let num_attrs: HashMap<String, f64> = widget_config
+        .iter()
+        .filter_map(|(key, value)| {
+            Some((
+                key.to_string(),
+                try_match!(Hocon::Integer(x) = value)
+                    .map(|&x| x as f64)
+                    .or_else(|_| try_match!(Hocon::Real(x) = value).map(|&x| x as f64))
+                    .ok()?,
+            ))
+        })
+        .collect();
+
+    Ok(WidgetUse {
+        name: widget_name.to_string(),
+        children,
+        str_attrs,
+        num_attrs,
+    })
+}
+
+pub fn parse_hocon(s: &str) -> Result<Hocon> {
+    Ok(HoconLoader::new().load_str(s)?.hocon()?)
+}
+
+#[cfg(test)]
+mod test {
+    use super::*;
+
+    const EXAMPLE_CONFIG: &'static str = r#"{
+        name: "example_widget"
+        structure {
+            layout_horizontal {
+                children: [
+                    { text { children: "hi", color: "red" } }
+                    { text: {} }
+                ]
+            }
+        }
+    }"#;
+
+    #[test]
+    fn test_parse() {
+        assert_eq!(
+            parse_element_use(Hocon::String("hi".to_string())).unwrap(),
+            ElementUse::Text("hi".to_string())
+        );
+    }
+
+    #[test]
+    fn test_parse_widget_definition() {
+        let expected = WidgetDefinition {
+            name: "example_widget".to_string(),
+            structure: ElementUse::Widget(WidgetUse {
+                name: "layout_horizontal".to_string(),
+                children: vec![
+                    ElementUse::Widget(WidgetUse::new(
+                        "text".to_string(),
+                        vec![ElementUse::Text("hi".to_string())],
+                    )),
+                    ElementUse::Widget(WidgetUse::new("text".to_string(), vec![])),
+                ],
+            }),
+        };
+
+        let parsed_hocon = parse_hocon("{ text: { children: \"hi\" } }").unwrap();
+        assert_eq!(
+            parse_element_use(parsed_hocon).unwrap(),
+            ElementUse::Widget(WidgetUse::new(
+                "text".to_string(),
+                vec![ElementUse::Text("hi".to_string())]
+            ))
+        );
+        assert_eq!(parse_widget_definition(EXAMPLE_CONFIG).unwrap(), expected);
+    }
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..793adf1
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,82 @@
+extern crate gio;
+extern crate gtk;
+
+use anyhow::*;
+use gdk::*;
+use gio::prelude::*;
+use gtk::prelude::*;
+use gtk::{Adjustment, Application, ApplicationWindow, Button, Scale};
+
+pub mod config;
+pub mod widgets;
+
+fn main() -> Result<()> {
+    let application = Application::new(Some("de.elkowar.eww"), Default::default())
+        .expect("failed to initialize GTK application");
+
+    application.connect_activate(|app| {
+        let window = ApplicationWindow::new(app);
+        window.set_title("Eww");
+        window.set_wmclass("noswallow", "noswallow");
+        window.set_type_hint(gdk::WindowTypeHint::Dock);
+        window.set_position(gtk::WindowPosition::Center);
+
+        let element = config::parse_element_use(
+            config::parse_hocon(
+                r#"{
+            layout_horizontal: {
+                children: [
+                    "hi",
+                    { button: { children: "click me you" } }
+                    { slider: {} }
+                    "hu"
+                ]
+            }
+        }"#,
+            )
+            .unwrap(),
+        )
+        .unwrap();
+        window.add(&element_to_gtk_widget(&element).unwrap());
+
+        window.show_all();
+    });
+
+    application.run(&[]);
+    Ok(())
+}
+
+fn element_to_gtk_widget(element: &config::ElementUse) -> Option<gtk::Widget> {
+    match element {
+        config::ElementUse::Text(text) => Some(gtk::Label::new(Some(&text)).upcast()),
+        config::ElementUse::Widget(widget) => {
+            widget_use_to_gtk_container(&widget).or(widget_use_to_gtk_widget(&widget))
+        }
+    }
+}
+
+fn widget_use_to_gtk_container(widget: &config::WidgetUse) -> Option<gtk::Widget> {
+    let container_widget: gtk::Container = match widget.name.as_str() {
+        "layout_horizontal" => gtk::Box::new(gtk::Orientation::Horizontal, 0).upcast(),
+        "button" => gtk::Button::new().upcast(),
+        _ => return None,
+    };
+
+    for child in &widget.children {
+        container_widget.add(&element_to_gtk_widget(child)?);
+    }
+    Some(container_widget.upcast())
+}
+
+fn widget_use_to_gtk_widget(widget: &config::WidgetUse) -> Option<gtk::Widget> {
+    let new_widget: gtk::Widget = match widget.name.as_str() {
+        "slider" => gtk::Scale::new(
+            gtk::Orientation::Horizontal,
+            Some(&gtk::Adjustment::new(50.0, 0.0, 100.0, 1.0, 1.0, 1.0)),
+        )
+        .upcast(),
+
+        _ => return None,
+    };
+    Some(new_widget)
+}
diff --git a/src/widgets/mod.rs b/src/widgets/mod.rs
new file mode 100644
index 0000000..e69de29