Stack function

1 files changed, 40 insertions, 0 deletions

diff --git a/src/library/stack.rs b/src/library/stack.rs
new file mode 100644
index 00000000..b6f92e16
--- /dev/null
+++ b/src/library/stack.rs
@@ -0,0 +1,40 @@
+use super::*;
+use crate::layout::{StackChild, StackNode};
+
+/// `stack`: Stack children along an axis.
+///
+/// # Positional parameters
+/// - Children: variadic, of type `template`.
+///
+/// # Named parameters
+/// - Stacking direction: `dir`, of type `direction`.
+///
+/// # Return value
+/// A template that places its children along the specified layouting axis.
+///
+/// # Relevant types and constants
+/// - Type `direction`
+///   - `ltr`
+///   - `rtl`
+///   - `ttb`
+///   - `btt`
+pub fn stack(ctx: &mut EvalContext, args: &mut FuncArgs) -> Value {
+    let dir = args.eat_named::<Dir>(ctx, "dir").unwrap_or(Dir::TTB);
+    let children = args.eat_all::<TemplateValue>(ctx);
+
+    Value::template("stack", move |ctx| {
+        let children = children
+            .iter()
+            .map(|child| {
+                let child = ctx.exec_template(child).into();
+                StackChild::Any(child, ctx.state.aligns)
+            })
+            .collect();
+
+        ctx.push(StackNode {
+            dirs: Gen::new(ctx.state.lang.dir, dir),
+            aspect: None,
+            children,
+        });
+    })
+}