Add cursor style option (#928)

The default cursor can now be configured through the cursor_style field
of the config. Valid options include Block, Underline, and Beam.

The default can be restored by sending \e[0q as in VTE terminals.

Live config reloading is supported for this parameter.

1 files changed, 12 insertions, 5 deletions

diff --git a/src/ansi.rs b/src/ansi.rs
index 2b196145..ec139294 100644
--- a/src/ansi.rs
+++ b/src/ansi.rs
@@ -179,7 +179,7 @@ pub trait Handler {
     fn set_title(&mut self, &str) {}
 
     /// Set the cursor style
-    fn set_cursor_style(&mut self, _: CursorStyle) {}
+    fn set_cursor_style(&mut self, _: Option<CursorStyle>) {}
 
     /// A character to be displayed
     fn input(&mut self, _c: char) {}
@@ -344,7 +344,7 @@ pub trait Handler {
 }
 
 /// Describes shape of cursor
-#[derive(Debug, Eq, PartialEq, Copy, Clone)]
+#[derive(Debug, Eq, PartialEq, Copy, Clone, Deserialize)]
 pub enum CursorStyle {
     /// Cursor is a block like `▒`
     Block,
@@ -356,6 +356,12 @@ pub enum CursorStyle {
     Beam,
 }
 
+impl Default for CursorStyle {
+    fn default() -> CursorStyle {
+        CursorStyle::Block
+    }
+}
+
 /// Terminal modes
 #[derive(Debug, Eq, PartialEq)]
 pub enum Mode {
@@ -1070,9 +1076,10 @@ impl<'a, H, W> vte::Perform for Performer<'a, H, W>
             'u' => handler.restore_cursor_position(),
             'q' => {
                 let style = match arg_or_default!(idx: 0, default: 0) {
-                    0 ... 2 => CursorStyle::Block,
-                    3 | 4 => CursorStyle::Underline,
-                    5 | 6 => CursorStyle::Beam,
+                    0 => None,
+                    1 | 2 => Some(CursorStyle::Block),
+                    3 | 4 => Some(CursorStyle::Underline),
+                    5 | 6 => Some(CursorStyle::Beam),
                     _ => unhandled!()
                 };