Add adjust-cursor-height metric

src/config/Config.zig

@@ -247,7 +247,8 @@ const c = @cImport({
 ///
 ///   * The font will be centered vertically in the cell.
 ///
-///   * The cursor will remain the same size as the font.
+///   * The cursor will remain the same size as the font, unless adjusted with
+///     `adjust-cursor-height`.
 ///
 ///   * Powerline glyphs will be adjusted along with the cell height so
 ///     that things like status lines continue to look aligned.
@@ -259,6 +260,7 @@ const c = @cImport({
 @"adjust-strikethrough-position": ?MetricModifier = null,
 @"adjust-strikethrough-thickness": ?MetricModifier = null,
 @"adjust-cursor-thickness": ?MetricModifier = null,
+@"adjust-cursor-height": ?MetricModifier = null,
 
 /// The method to use for calculating the cell width of a grapheme cluster.
 /// The default value is `unicode` which uses the Unicode standard to determine

src/font/SharedGridSet.zig

@@ -427,6 +427,7 @@ pub const DerivedConfig = struct {
     @"adjust-strikethrough-position": ?Metrics.Modifier,
     @"adjust-strikethrough-thickness": ?Metrics.Modifier,
     @"adjust-cursor-thickness": ?Metrics.Modifier,
+    @"adjust-cursor-height": ?Metrics.Modifier,
 
     /// Initialize a DerivedConfig. The config should be either a
     /// config.Config or another DerivedConfig to clone from.
@@ -461,6 +462,7 @@ pub const DerivedConfig = struct {
             .@"adjust-strikethrough-position" = config.@"adjust-strikethrough-position",
             .@"adjust-strikethrough-thickness" = config.@"adjust-strikethrough-thickness",
             .@"adjust-cursor-thickness" = config.@"adjust-cursor-thickness",
+            .@"adjust-cursor-height" = config.@"adjust-cursor-height",
 
             // This must be last so the arena contains all our allocations
             // from above since Zig does assignment in order.
@@ -598,6 +600,7 @@ pub const Key = struct {
             if (config.@"adjust-strikethrough-position") |m| try set.put(alloc, .strikethrough_position, m);
             if (config.@"adjust-strikethrough-thickness") |m| try set.put(alloc, .strikethrough_thickness, m);
             if (config.@"adjust-cursor-thickness") |m| try set.put(alloc, .cursor_thickness, m);
+            if (config.@"adjust-cursor-height") |m| try set.put(alloc, .cursor_height, m);
             break :set set;
         };
 

src/font/face/Metrics.zig

@@ -25,6 +25,9 @@ strikethrough_thickness: u32,
 /// because it is not determined by fonts but rather by user configuration.
 cursor_thickness: u32 = 1,
 
+/// cursor height as a percentage of cell_height
+cursor_height: u32 = 100,
+
 /// Original cell width and height. These are used to render the cursor
 /// in the original cell size after modification.
 original_cell_width: ?u32 = null,
@@ -32,6 +35,9 @@ original_cell_height: ?u32 = null,
 
 /// Apply a set of modifiers.
 pub fn apply(self: *Metrics, mods: ModifierSet) void {
+    if (mods.get(.cursor_height)) |mod| {
+        self.cursor_height = mod.apply(self.cursor_height);
+    }
     var it = mods.iterator();
     while (it.next()) |entry| {
         switch (entry.key_ptr.*) {
@@ -45,10 +51,9 @@ pub fn apply(self: *Metrics, mods: ModifierSet) void {
                 const new = @max(entry.value_ptr.apply(original), 1);
                 if (new == original) continue;
 
-                // Preserve the original cell width and height if not set.
                 if (self.original_cell_width == null) {
                     self.original_cell_width = self.cell_width;
-                    self.original_cell_height = self.cell_height;
+                    self.original_cell_height = self.cell_height * self.cursor_height / 100;
                 }
 
                 // Set the new value