Slightly better prettier settings and discovery

crates/language/src/language_settings.rs

@@ -47,6 +47,7 @@ pub struct LanguageSettings {
     pub show_wrap_guides: bool,
     pub wrap_guides: Vec<usize>,
     pub format_on_save: FormatOnSave,
+    pub prettier: bool,
     pub remove_trailing_whitespace_on_save: bool,
     pub ensure_final_newline_on_save: bool,
     pub formatter: Formatter,
@@ -92,6 +93,8 @@ pub struct LanguageSettingsContent {
     #[serde(default)]
     pub format_on_save: Option<FormatOnSave>,
     #[serde(default)]
+    pub prettier: Option<bool>,
+    #[serde(default)]
     pub remove_trailing_whitespace_on_save: Option<bool>,
     #[serde(default)]
     pub ensure_final_newline_on_save: Option<bool>,
@@ -398,6 +401,7 @@ fn merge_settings(settings: &mut LanguageSettings, src: &LanguageSettingsContent
     );
     merge(&mut settings.formatter, src.formatter.clone());
     merge(&mut settings.format_on_save, src.format_on_save.clone());
+    merge(&mut settings.prettier, src.prettier);
     merge(
         &mut settings.remove_trailing_whitespace_on_save,
         src.remove_trailing_whitespace_on_save,