Add cursorcolumn (#4084)

* Implement cursorcolumn

* Add documentation

* Separate column style from line with fallback

* Fallback to cursorcolumn first

* Switch to non-fallback try_get_exact

Add new function `try_get_exact`, which doesn't perform fallback,
and use that instead because the fallback behaviour is being handled
manually.

1 files changed, 7 insertions, 0 deletions

diff --git a/helix-view/src/theme.rs b/helix-view/src/theme.rs
index 85f5cc13..8a1f8b7e 100644
--- a/helix-view/src/theme.rs
+++ b/helix-view/src/theme.rs
@@ -277,6 +277,13 @@ impl Theme {
             .find_map(|s| self.styles.get(s).copied())
     }
 
+    /// Get the style of a scope, without falling back to dot separated broader
+    /// scopes. For example if `ui.text.focus` is not defined in the theme, it
+    /// will return `None`, even if `ui.text` is.
+    pub fn try_get_exact(&self, scope: &str) -> Option<Style> {
+        self.styles.get(scope).copied()
+    }
+
     #[inline]
     pub fn scopes(&self) -> &[String] {
         &self.scopes