Add a "yes-color" configuration option to allow overriding NO_COLOR

environment variable, which crossterm honors by default.

As noted in https://no-color.org/, "User-level configuration files
and per-instance command-line arguments should override $NO_COLOR".

book/src/configuration.md

@@ -58,6 +58,7 @@ Its settings will be merged with the configuration directory `config.toml` and t
 | `completion-replace` | Set to `true` to make completions always replace the entire word and not just the part before the cursor | `false` |
 | `auto-info` | Whether to display info boxes | `true` |
 | `true-color` | Set to `true` to override automatic detection of terminal truecolor support in the event of a false negative | `false` |
+| `yes-color` | Force override of NO_COLOR environment variable (see https://no-color.org/) | `false` |
 | `undercurl` | Set to `true` to override automatic detection of terminal undercurl support in the event of a false negative | `false` |
 | `rulers` | List of column positions at which to display the rulers. Can be overridden by language specific `rulers` in `languages.toml` file | `[]` |
 | `bufferline` | Renders a line at the top of the editor displaying open buffers. Can be `always`, `never` or `multiple` (only shown if more than one buffer is in use) | `never` |

helix-tui/src/backend/crossterm.rs

@@ -91,6 +91,9 @@ where
     W: Write,
 {
     pub fn new(buffer: W, config: &EditorConfig) -> CrosstermBackend<W> {
+        if config.yes_color {
+            crossterm::style::force_color_output(true);
+        }
         CrosstermBackend {
             buffer,
             capabilities: Capabilities::from_env_or_default(config),

helix-view/src/editor.rs

@@ -301,6 +301,8 @@ pub struct Config {
     pub true_color: bool,
     /// Set to `true` to override automatic detection of terminal undercurl support in the event of a false negative. Defaults to `false`.
     pub undercurl: bool,
+    /// Force override of NO_COLOR environment variable (see https://no-color.org/)
+    pub yes_color: bool,
     /// Search configuration.
     #[serde(default)]
     pub search: SearchConfig,
@@ -892,6 +894,7 @@ impl Default for Config {
             cursor_shape: CursorShapeConfig::default(),
             true_color: false,
             undercurl: false,
+            yes_color: false,
             search: SearchConfig::default(),
             lsp: LspConfig::default(),
             terminal: get_terminal_provider(),