Exctract cursor code

src/cursor.rs

@@ -0,0 +1,31 @@
+use cairo;
+use ui_model::Color;
+use shell::{Shell, NvimMode};
+
+pub struct Cursor {
+}
+
+impl Cursor {
+    pub fn new() -> Cursor {
+        Cursor {  }
+    }
+
+    pub fn draw(&self, ctx: &cairo::Context, shell: &Shell, 
+                char_width: f64, line_height: f64, line_y: f64, double_width: bool, bg: &Color) {
+        let current_point = ctx.get_current_point();
+        ctx.set_source_rgba(1.0 - bg.0, 1.0 - bg.1, 1.0 - bg.2, 0.5);
+
+        let cursor_width = if shell.mode == NvimMode::Insert {
+            char_width / 5.0
+        } else {
+            if double_width {
+                char_width * 2.0
+            } else {
+                char_width
+            }
+        };
+
+        ctx.rectangle(current_point.0, line_y, cursor_width, line_height);
+        ctx.fill();
+    }
+}