Format cursor code and add documentation

As requested a few comments have been added to the darwin code. There
also was an off by one error in the ascent calculation which has been
corrected.

The beam cursor width has also been tweaked to be slightly slimmer in
general.

All code added in this PR has also been run through the default rustfmt
to make sure the formatting is okay.

1 files changed, 6 insertions, 4 deletions

diff --git a/font/src/ft/mod.rs b/font/src/ft/mod.rs
index 7b22fb03..765e8efb 100644
--- a/font/src/ft/mod.rs
+++ b/font/src/ft/mod.rs
@@ -298,7 +298,8 @@ impl FreeTypeRasterizer {
         match glyph_key.c {
             super::UNDERLINE_CURSOR_CHAR => {
                 // Get the bottom of the bounding box
-                let size_metrics = face.ft_face.size_metrics()
+                let size_metrics = face.ft_face
+                    .size_metrics()
                     .ok_or(Error::MissingSizeMetrics)?;
                 let descent = (size_metrics.descender / 64) as i32;
 
@@ -308,10 +309,11 @@ impl FreeTypeRasterizer {
 
                 // Return the new custom glyph
                 super::get_underline_cursor_glyph(descent, width)
-            },
+            }
             super::BEAM_CURSOR_CHAR => {
                 // Get the top of the bounding box
-                let size_metrics = face.ft_face.size_metrics()
+                let size_metrics = face.ft_face
+                    .size_metrics()
                     .ok_or(Error::MissingSizeMetrics)?;
                 let ascent = (size_metrics.ascender / 64) as i32 - 1;
 
@@ -325,7 +327,7 @@ impl FreeTypeRasterizer {
 
                 // Return the new custom glyph
                 super::get_beam_cursor_glyph(ascent, height, width)
-            },
+            }
             _ => {
                 // If it's not a special char, return the normal glyph
                 Ok(RasterizedGlyph {