clippy: Fix doc_markdown warnings, enable by default.

clippy.toml

@@ -3,3 +3,5 @@
 # it makes sense to optimize for 64-bit and accept the performance hits on 32-bit.
 # 16 bytes is the number of bytes that fits into two 64-bit CPU registers.
 trivial-copy-size-limit = 16
+# Don't warn about these identifiers when using clippy::doc_markdown.
+doc-valid-idents = ["Direct2D", "PostScript", ".."]

src/affine.rs

@@ -78,7 +78,7 @@ impl Affine {
 
     /// An affine transform representing a rotation of `th` radians about `center`.
     ///
-    /// See [Affine::rotate] for more info.
+    /// See [`Affine::rotate()`] for more info.
     #[inline]
     pub fn rotate_about(th: f64, center: Point) -> Affine {
         let center = center.to_vec2();
@@ -96,7 +96,7 @@ impl Affine {
 
     /// An affine transformation representing a skew.
     ///
-    /// The skew_x and skew_y parameters represent skew factors for the
+    /// The `skew_x` and `skew_y` parameters represent skew factors for the
     /// horizontal and vertical directions, respectively.
     ///
     /// This is commonly used to generate a faux oblique transform for
@@ -210,7 +210,7 @@ impl Affine {
         Affine::rotate(th) * self
     }
 
-    /// `self` followed by a rotation of `th` about `center.
+    /// `self` followed by a rotation of `th` about `center`.
     ///
     /// Equivalent to `Affine::rotate_about(th, center) * self`
     #[inline]

src/bezpath.rs

@@ -1157,11 +1157,11 @@ impl PathSeg {
         a
     }
 
-    /// Minimum distance between two PathSegs
+    /// Minimum distance between two [`PathSeg`]s.
     ///
     /// Returns a tuple of the distance, the path time `t1` of the closest point
-    /// on the first PathSeg, and the path time `t2` of the closest point on the
-    /// second PathSeg.
+    /// on the first `PathSeg`, and the path time `t2` of the closest point on the
+    /// second `PathSeg`.
     pub fn min_dist(&self, other: PathSeg, accuracy: f64) -> MinDistance {
         let (distance, t1, t2) = crate::mindist::min_dist_param(
             &self.as_vec2_vec(),
@@ -1648,7 +1648,7 @@ mod tests {
         assert_eq!(expected_svg, reversed.to_svg());
     }
 
-    /// https://github.com/fonttools/fonttools/blob/bf265ce49e0cae6f032420a4c80c31d8e16285b8/Tests/pens/reverseContourPen_test.py#L7
+    // https://github.com/fonttools/fonttools/blob/bf265ce49e0cae6f032420a4c80c31d8e16285b8/Tests/pens/reverseContourPen_test.py#L7
     #[test]
     fn test_reverse_lines() {
         let mut path = BezPath::new();

src/lib.rs

@@ -70,7 +70,7 @@
 
 #![forbid(unsafe_code)]
 #![deny(missing_docs, clippy::trivially_copy_pass_by_ref)]
-#![warn(rustdoc::broken_intra_doc_links)]
+#![warn(clippy::doc_markdown, rustdoc::broken_intra_doc_links)]
 #![allow(
     clippy::unreadable_literal,
     clippy::many_single_char_names,

src/rounded_rect_radii.rs

@@ -31,9 +31,9 @@ pub struct RoundedRectRadii {
 }
 
 impl RoundedRectRadii {
-    /// Create a new RoundedRectRadii. This function takes radius values for
-    /// the four corners. The argument order is "top_left, top_right,
-    /// bottom_right, bottom_left", or clockwise starting from top_left.
+    /// Create a new `RoundedRectRadii`. This function takes radius values for
+    /// the four corners. The argument order is `top_left`, `top_right`,
+    /// `bottom_right`, `bottom_left`, or clockwise starting from `top_left`.
     pub const fn new(top_left: f64, top_right: f64, bottom_right: f64, bottom_left: f64) -> Self {
         RoundedRectRadii {
             top_left,
@@ -43,7 +43,7 @@ impl RoundedRectRadii {
         }
     }
 
-    /// Create a new RoundedRectRadii from a single radius. The `radius`
+    /// Create a new `RoundedRectRadii` from a single radius. The `radius`
     /// argument will be set as the radius for all four corners.
     pub const fn from_single_radius(radius: f64) -> Self {
         RoundedRectRadii {

src/svg.rs

@@ -393,7 +393,7 @@ impl<'a> SvgLexer<'a> {
 impl SvgArc {
     /// Checks that arc is actually a straight line.
     ///
-    /// In this case, it can be replaced with a LineTo.
+    /// In this case, it can be replaced with a `LineTo`.
     pub fn is_straight_line(&self) -> bool {
         self.radii.x.abs() <= 1e-5 || self.radii.y.abs() <= 1e-5 || self.from == self.to
     }