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, 19 insertions, 9 deletions

diff --git a/helix-term/src/application.rs b/helix-term/src/application.rs
index 90330751..3e0b6d59 100644
--- a/helix-term/src/application.rs
+++ b/helix-term/src/application.rs
@@ -76,17 +76,27 @@ impl Application {
             None => Ok(def_lang_conf),
         };
 
-        let theme = if let Some(theme) = &config.theme {
-            match theme_loader.load(theme) {
-                Ok(theme) => theme,
-                Err(e) => {
-                    log::warn!("failed to load theme `{}` - {}", theme, e);
+        let true_color = config.editor.true_color || crate::true_color();
+        let theme = config
+            .theme
+            .as_ref()
+            .and_then(|theme| {
+                theme_loader
+                    .load(theme)
+                    .map_err(|e| {
+                        log::warn!("failed to load theme `{}` - {}", theme, e);
+                        e
+                    })
+                    .ok()
+                    .filter(|theme| (true_color || theme.is_16_color()))
+            })
+            .unwrap_or_else(|| {
+                if true_color {
                     theme_loader.default()
+                } else {
+                    theme_loader.base16_default()
                 }
-            }
-        } else {
-            theme_loader.default()
-        };
+            });
 
         let syn_loader_conf: helix_core::syntax::Configuration = lang_conf
             .and_then(|conf| conf.try_into())