Load alt default theme if true color is not supported

* Move `runtime/themes/base16_default_terminal.toml` to
  `base16_theme.toml` alongside `theme.toml`
* Use `terminfo` crate to detect whether the terminal supports true
  color and, if the user has no theme configured and their terminal does
  not support true color, load the alt default theme instead of the
  normal default.

Remove `terminfo` dependency, use `COLORTERM` env instead

Prevent user from switching to an unsupported theme

Add `true-color-override` option

If the terminal is wrongly detected to not support true color,
`true-color-override = true` will override the detection.

Rename `true-color-override` to `true-color`

1 files changed, 3 insertions, 9 deletions

diff --git a/helix-view/src/editor.rs b/helix-view/src/editor.rs
index dcbcbe4f..753defa1 100644
--- a/helix-view/src/editor.rs
+++ b/helix-view/src/editor.rs
@@ -105,6 +105,8 @@ pub struct Config {
     /// Whether to display infoboxes. Defaults to true.
     pub auto_info: bool,
     pub file_picker: FilePickerConfig,
+    /// Set to `true` to override automatic detection of terminal truecolor support in the event of a false negative. Defaults to `false`.
+    pub true_color: bool,
 }
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq, Deserialize)]
@@ -137,6 +139,7 @@ impl Default for Config {
             completion_trigger_len: 2,
             auto_info: true,
             file_picker: FilePickerConfig::default(),
+            true_color: false,
         }
     }
 }
@@ -265,15 +268,6 @@ impl Editor {
         self._refresh();
     }
 
-    pub fn set_theme_from_name(&mut self, theme: &str) -> anyhow::Result<()> {
-        let theme = self
-            .theme_loader
-            .load(theme.as_ref())
-            .with_context(|| format!("failed setting theme `{}`", theme))?;
-        self.set_theme(theme);
-        Ok(())
-    }
-
     /// Refreshes the language server for a given document
     pub fn refresh_language_server(&mut self, doc_id: DocumentId) -> Option<()> {
         let doc = self.documents.get_mut(&doc_id)?;