Switch from name to ratio for font stretch parameter 📐

src/library/font.rs

@@ -12,10 +12,10 @@ use super::*;
 /// # Named arguments
 /// - Font Style:                   `style`, of type `font-style`.
 /// - Font Weight:                  `weight`, of type `font-weight`.
-/// - Font Stretch:                 `stretch`, of type `font-stretch`.
 /// - Serif family definition:      `serif`, of type `font-families`.
 /// - Sans-serif family definition: `sans-serif`, of type `font-families`.
 /// - Monospace family definition:  `monospace`, of type `font-families`.
+/// - Font Stretch:                 `stretch`, of type `relative`, between 0.5 and 2.0.
 ///
 /// # Relevant types and constants
 /// - Type `font-families`
@@ -42,16 +42,6 @@ use super::*;
 ///     - `extrabold` (800)
 ///     - `black` (900)
 ///     - coerces from `integer`
-/// - Type `font-stretch`
-///     - `ultra-condensed`
-///     - `extra-condensed`
-///     - `condensed`
-///     - `semi-condensed`
-///     - `normal`
-///     - `semi-expanded`
-///     - `expanded`
-///     - `extra-expanded`
-///     - `ultra-expanded`
 pub fn font(ctx: &mut EvalContext, args: &mut ValueArgs) -> Value {
     let size = args.find::<Linear>(ctx);
     let list: Vec<_> = args.filter::<FontFamily>(ctx).map(|f| f.to_string()).collect();
@@ -160,7 +150,7 @@ typify! {
 }
 
 typify! {
-    FontStyle: "font style"
+    FontStyle: "font style",
 }
 
 typify! {
@@ -179,5 +169,15 @@ typify! {
 }
 
 typify! {
-    FontStretch: "font stretch"
+    FontStretch: "font stretch",
+    Value::Relative(relative) => {
+        let f = |stretch: Self| Relative::new(stretch.to_ratio());
+        let [min, max] = [f(Self::UltraCondensed), f(Self::UltraExpanded)];
+        let value = Self::from_ratio(relative.get());
+        return if relative < min || relative > max {
+            CastResult::Warn(value, format!("should be between {} and {}", min, max))
+        } else {
+            CastResult::Ok(value)
+        };
+    },
 }

src/library/mod.rs

@@ -23,7 +23,7 @@ pub use spacing::*;
 
 use std::fmt::{self, Display, Formatter};
 
-use fontdock::{FontStretch, FontStyle, FontWeight};
+use fontdock::{FontStyle, FontWeight};
 
 use crate::eval::{Scope, ValueAny, ValueFunc};
 use crate::exec::Softness;
@@ -81,15 +81,6 @@ pub fn new() -> Scope {
     set!(any: "bold", FontWeight::BOLD);
     set!(any: "extrabold", FontWeight::EXTRABOLD);
     set!(any: "black", FontWeight::BLACK);
-    set!(any: "ultra-condensed", FontStretch::UltraCondensed);
-    set!(any: "extra-condensed", FontStretch::ExtraCondensed);
-    set!(any: "condensed", FontStretch::Condensed);
-    set!(any: "semi-condensed", FontStretch::SemiCondensed);
-    set!(any: "normal", FontStretch::Normal);
-    set!(any: "semi-expanded", FontStretch::SemiExpanded);
-    set!(any: "expanded", FontStretch::Expanded);
-    set!(any: "extra-expanded", FontStretch::ExtraExpanded);
-    set!(any: "ultra-expanded", FontStretch::UltraExpanded);
 
     std
 }

tests/typ/library/font.typ

@@ -18,7 +18,7 @@
 #font(weight: bold)[Bold]
 
 // Set stretch (not available, matching closest).
-#font(stretch: ultra-condensed)[Condensed]
+#font(stretch: 50%)[Condensed]
 
 // Set family.
 #font("PT Sans")[Sans serif]
@@ -45,5 +45,8 @@ Emoji: 🐪, 🌋, 🏞
 // Warning: 15-19 should be between 100 and 900
 #font(weight: 2700)
 
+// Warning: 16-21 should be between 50% and 200%
+#font(stretch: 1000%)
+
 // Error: 7-27 unexpected argument
 #font(something: "invalid")