there was an attempt at variable intrepolation support

Cargo.toml

@@ -11,8 +11,10 @@ gtk = { version = "0.9", features = [ "v3_16" ] }
 gdk = { version = "", features = ["v3_16"] }
 gio = { version = "", features = ["v2_44"] }
 
+regex = "1"
 
-hocon = { version = "0.3", features = [ "serde-support" ]}
+
+hocon = { version = "0.3", default-features = false, features = [ "serde-support" ]}
 
 try_match = "0.2.2"
 
@@ -20,8 +22,3 @@ anyhow = "1.0"
 #thiserror = "1.0"
 
 
-[target.x86_64-unknown-linux-gnu]
-rustflags = [
-    "-C", "link-arg=-fuse-ld=lld",
-]
-

src/config/mod.rs

@@ -1,11 +1,14 @@
 use anyhow::*;
 use hocon::*;
 use hocon_ext::HoconExt;
-use std::collections::HashMap;
+use std::{collections::HashMap, convert::TryFrom};
 use try_match::try_match;
 
 pub mod hocon_ext;
 
+#[derive(Debug, PartialEq, Eq)]
+pub struct AttrValue(pub String);
+
 #[derive(Debug, PartialEq)]
 pub struct WidgetDefinition {
     pub name: String,
@@ -22,8 +25,7 @@ pub enum ElementUse {
 pub struct WidgetUse {
     pub name: String,
     pub children: Vec<ElementUse>,
-    pub num_attrs: HashMap<String, f64>,
-    pub str_attrs: HashMap<String, String>,
+    pub attrs: HashMap<String, AttrValue>,
 }
 
 impl WidgetUse {
@@ -31,8 +33,7 @@ impl WidgetUse {
         WidgetUse {
             name,
             children,
-            num_attrs: HashMap::new(),
-            str_attrs: HashMap::new(),
+            attrs: HashMap::new(),
         }
     }
 }
@@ -85,25 +86,18 @@ pub fn parse_widget_use(data: HashMap<String, Hocon>) -> Result<WidgetUse> {
         )),
     }?;
 
-    let str_attrs: HashMap<String, String> = widget_config
+    let attrs: HashMap<String, AttrValue> = 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()?,
+                match value {
+                    Hocon::String(s) => AttrValue(s.to_string()),
+                    Hocon::Integer(n) => AttrValue(format!("{}", n)),
+                    Hocon::Real(n) => AttrValue(format!("{}", n)),
+                    Hocon::Boolean(b) => AttrValue(format!("{}", b)),
+                    _ => return None,
+                },
             ))
         })
         .collect();
@@ -111,8 +105,7 @@ pub fn parse_widget_use(data: HashMap<String, Hocon>) -> Result<WidgetUse> {
     Ok(WidgetUse {
         name: widget_name.to_string(),
         children,
-        str_attrs,
-        num_attrs,
+        attrs,
     })
 }
 
@@ -150,6 +143,7 @@ mod test {
             name: "example_widget".to_string(),
             structure: ElementUse::Widget(WidgetUse {
                 name: "layout_horizontal".to_string(),
+                attrs: HashMap::new(),
                 children: vec![
                     ElementUse::Widget(WidgetUse::new(
                         "text".to_string(),

src/main.rs

@@ -1,11 +1,14 @@
+#![feature(try_blocks)]
 extern crate gio;
 extern crate gtk;
 
-use anyhow::*;
+use anyhow::{self, Context, Result};
 use gdk::*;
 use gio::prelude::*;
 use gtk::prelude::*;
 use gtk::{Adjustment, Application, ApplicationWindow, Button, Scale};
+use regex::Regex;
+use std::{collections::HashMap, str::FromStr};
 
 pub mod config;
 pub mod widgets;
@@ -20,6 +23,7 @@ fn main() -> Result<()> {
         window.set_wmclass("noswallow", "noswallow");
         window.set_type_hint(gdk::WindowTypeHint::Dock);
         window.set_position(gtk::WindowPosition::Center);
+        window.set_keep_above(true);
 
         let element = config::parse_element_use(
             config::parse_hocon(
@@ -37,7 +41,10 @@ fn main() -> Result<()> {
             .unwrap(),
         )
         .unwrap();
-        window.add(&element_to_gtk_widget(&element).unwrap());
+
+        let widget_state = WidgetState(HashMap::new());
+
+        window.add(&element_to_gtk_widget(&widget_state, &element).unwrap());
 
         window.show_all();
     });
@@ -46,16 +53,21 @@ fn main() -> Result<()> {
     Ok(())
 }
 
-fn element_to_gtk_widget(element: &config::ElementUse) -> Option<gtk::Widget> {
+fn element_to_gtk_widget(
+    widget_state: &WidgetState,
+    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))
-        }
+        config::ElementUse::Widget(widget) => widget_use_to_gtk_container(widget_state, &widget)
+            .or(widget_use_to_gtk_widget(widget_state, &widget)),
     }
 }
 
-fn widget_use_to_gtk_container(widget: &config::WidgetUse) -> Option<gtk::Widget> {
+fn widget_use_to_gtk_container(
+    widget_state: &WidgetState,
+    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(),
@@ -63,20 +75,73 @@ fn widget_use_to_gtk_container(widget: &config::WidgetUse) -> Option<gtk::Widget
     };
 
     for child in &widget.children {
-        container_widget.add(&element_to_gtk_widget(child)?);
+        container_widget.add(&element_to_gtk_widget(widget_state, child)?);
     }
     Some(container_widget.upcast())
 }
 
-fn widget_use_to_gtk_widget(widget: &config::WidgetUse) -> Option<gtk::Widget> {
+fn widget_use_to_gtk_widget(
+    widget_state: &WidgetState,
+    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(),
+        "slider" => {
+            let slider_value: f64 = widget_state.resolve(widget.attrs.get("value")?)?;
+
+            gtk::Scale::new(
+                gtk::Orientation::Horizontal,
+                Some(&gtk::Adjustment::new(
+                    slider_value,
+                    0.0,
+                    100.0,
+                    1.0,
+                    1.0,
+                    1.0,
+                )),
+            )
+            .upcast()
+        }
 
         _ => return None,
     };
     Some(new_widget)
 }
+
+struct WidgetState(HashMap<String, config::AttrValue>);
+
+impl WidgetState {
+    pub fn resolve<T>(&self, value: &config::AttrValue) -> Option<String>
+    where
+        T: FromStr,
+    {
+        let var_pattern: Regex = Regex::new(r"\$\$\{(.*)\}").unwrap();
+        let config::AttrValue(value) = value;
+
+        let mut missing_var: Option<String> = None;
+        var_pattern.replace_all(value, |caps: &regex::Captures| {
+            self.lookup_full::<T>(&caps[1]).unwrap_or_else(|| {
+                missing_var = Some(caps[1].to_string());
+                "missing".to_string()
+            })
+        });
+
+        // TODO REEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEe
+
+        unimplemented!();
+    }
+
+    pub fn lookup_full<T>(&self, key: &str) -> Option<String>
+    where
+        T: FromStr,
+    {
+        self.resolve::<T>(self.0.get(key)?)
+    }
+}
+
+// macro_rules! build {
+//     ($var_name:ident = $value:expr ; $code:block) => {{
+//         let mut $var_name = $value;
+//         $code;
+//         $var_name
+//     }};
+// }