Add undercurl config option #6196 (#6253)

If set to 'true' this option will force terminal undercurl support.

1 files changed, 9 insertions, 5 deletions

diff --git a/helix-tui/src/backend/crossterm.rs b/helix-tui/src/backend/crossterm.rs
index fba1f029..4b230f53 100644
--- a/helix-tui/src/backend/crossterm.rs
+++ b/helix-tui/src/backend/crossterm.rs
@@ -14,7 +14,10 @@ use crossterm::{
     terminal::{self, Clear, ClearType},
     Command,
 };
-use helix_view::graphics::{Color, CursorKind, Modifier, Rect, UnderlineStyle};
+use helix_view::{
+    editor::Config as EditorConfig,
+    graphics::{Color, CursorKind, Modifier, Rect, UnderlineStyle},
+};
 use once_cell::sync::OnceCell;
 use std::{
     fmt,
@@ -39,14 +42,15 @@ impl Capabilities {
     /// Detect capabilities from the terminfo database located based
     /// on the $TERM environment variable. If detection fails, returns
     /// a default value where no capability is supported.
-    pub fn from_env_or_default() -> Self {
+    pub fn from_env_or_default(config: &EditorConfig) -> Self {
         match termini::TermInfo::from_env() {
             Err(_) => Capabilities::default(),
             Ok(t) => Capabilities {
                 // Smulx, VTE: https://unix.stackexchange.com/a/696253/246284
                 // Su (used by kitty): https://sw.kovidgoyal.net/kitty/underlines
                 // WezTerm supports underlines but a lot of distros don't properly install it's terminfo
-                has_extended_underlines: t.extended_cap("Smulx").is_some()
+                has_extended_underlines: config.undercurl
+                    || t.extended_cap("Smulx").is_some()
                     || t.extended_cap("Su").is_some()
                     || vte_version() >= Some(5102)
                     || matches!(term_program().as_deref(), Some("WezTerm")),
@@ -65,10 +69,10 @@ impl<W> CrosstermBackend<W>
 where
     W: Write,
 {
-    pub fn new(buffer: W) -> CrosstermBackend<W> {
+    pub fn new(buffer: W, config: &EditorConfig) -> CrosstermBackend<W> {
         CrosstermBackend {
             buffer,
-            capabilities: Capabilities::from_env_or_default(),
+            capabilities: Capabilities::from_env_or_default(config),
             supports_keyboard_enhancement_protocol: OnceCell::new(),
         }
     }