Add font size function 🌱

src/library/mod.rs

@@ -29,6 +29,8 @@ pub fn std() -> Scope {
     std.add::<ParBreak>("par.break");
     std.add::<PageBreak>("page.break");
 
+    std.add::<FontSize>("font.size");
+
     std.add_with_metadata::<Spacing, Option<AxisKey>>("spacing", None);
 
     for (name, key) in &[("h", AxisKey::Horizontal), ("v", AxisKey::Vertical)] {
@@ -188,3 +190,33 @@ function! {
         }
     }
 }
+
+function! {
+    /// `font.size`: Set the font size.
+    #[derive(Debug, PartialEq)]
+    pub struct FontSize {
+        body: Option<SyntaxTree>,
+        size: Size,
+    }
+
+    parse(args, body, ctx) {
+        FontSize {
+            body: parse!(optional: body, ctx),
+            size: args.get_pos::<Size>()?.v,
+        }
+    }
+
+    layout(self, mut ctx) {
+        let mut style = ctx.style.text.clone();
+        style.font_size = self.size;
+
+        match &self.body {
+            Some(body) => vec![
+                SetTextStyle(style),
+                LayoutTree(body),
+                SetTextStyle(ctx.style.text.clone()),
+            ],
+            None => vec![SetTextStyle(style)]
+        }
+    }
+}

src/style.rs

@@ -72,10 +72,10 @@ impl Default for TextStyle {
         TextStyle {
             classes: vec![Regular],
             fallback: vec![Serif],
-            font_size: Size::pt(10.0),
+            font_size: Size::pt(11.0),
             word_spacing: 0.25,
             line_spacing: 1.2,
-            paragraph_spacing: 1.4,
+            paragraph_spacing: 1.5,
         }
     }
 }