Replace default colors with an rgb gradient

src/keyboard.cr

@@ -10,6 +10,7 @@ class Keyboard
     @raw_layout = File.read(name)
     i = 0
     c = @raw_layout.chars
+
     # iterates over characters in layout
     while i < c.size
       # outputs a hashmap of characters inside [] in the layout and sets each to 0 uses
@@ -29,14 +30,30 @@ class Keyboard
   def to_s(io : IO)
     # remove character escapes
     formatted = @raw_layout.gsub(/\\(\S)/, &.[1])
-    # defines heatmap colors
+
-    colors = %i(default light_yellow yellow light_red red)
+    # an rgb gradient from purple to red
+    # defines the heatmap colors
+    colors = [
+      {74, 16, 99},
+      {113, 30, 114},
+      {137, 40, 107},
+      {160, 50, 100},
+      {183, 60, 94},
+      {207, 70, 87},
+      {230, 80, 80},
+    ]
+
     # add a keypress heatmap
-    max = @layout.to_a.sort_by { |k, v| v }.reverse.to_h.values[0]
+    max = @layout.to_a.sort_by { |_, v| v }.reverse.to_h.values[0]
     formatted = formatted.gsub(/\[(.{1,2})\]/) { |m|
       # calculate proportion of key usage to colors
-      m.colorize.fore(:white).back(colors[((@layout[m.chars[1]] * (colors.size - 1)) / max).to_i])
+      char_color = colors[((@layout[m.chars[1]] * (colors.size - 1)) / max).to_i]
+
+      # set the key color
+      m.colorize.fore(:white).back(Colorize::ColorRGB.new(char_color[0].to_u8, char_color[1].to_u8, char_color[2].to_u8))
     }
+
+    # output the result
     io << formatted
   end
 end