New page margins API

src/library/layout/page.rs

@@ -18,14 +18,9 @@ impl PageNode {
     /// Whether the page is flipped into landscape orientation.
     pub const FLIPPED: bool = false;
 
-    /// The left margin.
-    pub const LEFT: Smart<Relative<RawLength>> = Smart::Auto;
-    /// The right margin.
-    pub const RIGHT: Smart<Relative<RawLength>> = Smart::Auto;
-    /// The top margin.
-    pub const TOP: Smart<Relative<RawLength>> = Smart::Auto;
-    /// The bottom margin.
-    pub const BOTTOM: Smart<Relative<RawLength>> = Smart::Auto;
+    /// The page margin.
+    #[property(fold)]
+    pub const MARGINS: Sides<Smart<Relative<RawLength>>> = Sides::splat(Smart::Auto);
 
     /// How many columns the page has.
     pub const COLUMNS: NonZeroUsize = NonZeroUsize::new(1).unwrap();
@@ -54,13 +49,7 @@ impl PageNode {
         styles.set_opt(Self::WIDTH, args.named("width")?);
         styles.set_opt(Self::HEIGHT, args.named("height")?);
 
-        let all = args.named("margins")?;
-        let hor = args.named("horizontal")?;
-        let ver = args.named("vertical")?;
-        styles.set_opt(Self::LEFT, args.named("left")?.or(hor).or(all));
-        styles.set_opt(Self::TOP, args.named("top")?.or(ver).or(all));
-        styles.set_opt(Self::RIGHT, args.named("right")?.or(hor).or(all));
-        styles.set_opt(Self::BOTTOM, args.named("bottom")?.or(ver).or(all));
+        styles.set_opt(Self::MARGINS, args.named("margins")?);
 
         styles.set_opt(Self::FLIPPED, args.named("flipped")?);
         styles.set_opt(Self::FILL, args.named("fill")?);
@@ -96,12 +85,7 @@ impl PageNode {
 
         // Determine the margins.
         let default = Relative::from(0.1190 * min);
-        let padding = Sides {
-            left: styles.get(Self::LEFT).unwrap_or(default),
-            right: styles.get(Self::RIGHT).unwrap_or(default),
-            top: styles.get(Self::TOP).unwrap_or(default),
-            bottom: styles.get(Self::BOTTOM).unwrap_or(default),
-        };
+        let padding = styles.get(Self::MARGINS).map(|side| side.unwrap_or(default));
 
         let mut child = self.0.clone();
 

src/model/styles.rs

@@ -7,7 +7,7 @@ use std::sync::Arc;
 
 use super::{Content, Show, ShowNode};
 use crate::diag::{At, TypResult};
-use crate::eval::{Args, Func, Node, Smart, Value};
+use crate::eval::{Args, Func, Node, RawLength, Smart, Value};
 use crate::geom::{Length, Numeric, Relative, Sides, Spec};
 use crate::library::layout::PageNode;
 use crate::library::structure::{EnumNode, ListNode};
@@ -488,6 +488,19 @@ impl Fold for Sides<Option<Relative<Length>>> {
     }
 }
 
+impl Fold for Sides<Smart<Relative<RawLength>>> {
+    type Output = Sides<Smart<Relative<RawLength>>>;
+
+    fn fold(self, outer: Self::Output) -> Self::Output {
+        Sides {
+            left: self.left.or(outer.left),
+            top: self.top.or(outer.top),
+            right: self.right.or(outer.right),
+            bottom: self.bottom.or(outer.bottom),
+        }
+    }
+}
+
 /// A scoped property barrier.
 ///
 /// Barriers interact with [scoped](StyleMap::scoped) styles: A scoped style

tests/typ/layout/page-margin.typ

@@ -11,10 +11,10 @@
 ---
 // Set individual margins.
 #set page(height: 40pt)
-[#set page(left: 0pt); #align(left)[Left]]
-[#set page(right: 0pt); #align(right)[Right]]
-[#set page(top: 0pt); #align(top)[Top]]
-[#set page(bottom: 0pt); #align(bottom)[Bottom]]
+[#set page(margins: (left: 0pt,)); #align(left)[Left]]
+[#set page(margins: (right: 0pt,)); #align(right)[Right]]
+[#set page(margins: (top: 0pt,)); #align(top)[Top]]
+[#set page(margins: (bottom: 0pt,)); #align(bottom)[Bottom]]
 
 // Ensure that specific margins override general margins.
-[#set page(margins: 0pt, left: 20pt); Overriden]
+[#set page(margins: (rest: 0pt, left: 20pt)); Overriden]

tests/typ/layout/page-marginals.typ

@@ -1,7 +1,6 @@
 #set page(
   paper: "a8",
-  margins: 30pt,
-  horizontal: 15pt,
+  margins: (x: 15pt, y: 30pt),
   header: align(horizon, {
     text(eastern)[*Typst*]
     h(1fr)
@@ -18,5 +17,5 @@ do wear it; cast it off. It is my lady, O, it is my love! O, that she knew she
 were! She speaks yet she says nothing: what of that? Her eye discourses; I will
 answer it.
 
-#set page(header: none, height: auto, top: 15pt, bottom: 25pt)
+#set page(header: none, height: auto, margins: (top: 15pt, bottom: 25pt))
 The END.

tests/typ/layout/page.typ

@@ -24,7 +24,7 @@
 // Test page fill.
 #set page(width: 80pt, height: 40pt, fill: eastern)
 #text(15pt, "Roboto", fill: white, smallcaps: true)[Typst]
-#page(width: 40pt, fill: none, margins: auto, top: 10pt)[Hi]
+#page(width: 40pt, fill: none, margins: (top: 10pt, rest: auto))[Hi]
 
 ---
 // Just page followed by pagebreak.

tests/typeset.rs

@@ -12,7 +12,7 @@ use walkdir::WalkDir;
 use typst::diag::Error;
 use typst::eval::{Smart, Value};
 use typst::frame::{Element, Frame};
-use typst::geom::{Length, RgbaColor};
+use typst::geom::{Length, RgbaColor, Sides};
 use typst::library::layout::PageNode;
 use typst::library::text::{TextNode, TextSize};
 use typst::loading::FsLoader;
@@ -64,10 +64,10 @@ fn main() {
     let mut styles = StyleMap::new();
     styles.set(PageNode::WIDTH, Smart::Custom(Length::pt(120.0).into()));
     styles.set(PageNode::HEIGHT, Smart::Auto);
-    styles.set(PageNode::LEFT, Smart::Custom(Length::pt(10.0).into()));
-    styles.set(PageNode::TOP, Smart::Custom(Length::pt(10.0).into()));
-    styles.set(PageNode::RIGHT, Smart::Custom(Length::pt(10.0).into()));
-    styles.set(PageNode::BOTTOM, Smart::Custom(Length::pt(10.0).into()));
+    styles.set(
+        PageNode::MARGINS,
+        Sides::splat(Smart::Custom(Length::pt(10.0).into())),
+    );
     styles.set(TextNode::SIZE, TextSize(Length::pt(10.0).into()));
 
     // Hook up an assert function into the global scope.