Autodetect parser name with prettier by default (#11558)

Closes https://github.com/zed-industries/zed/issues/11517 

* Removes forced prettier parser name for languages, making `auto`
command to run prettier on every file by default.
* Moves prettier configs away from plugin language declarations into
language settings

Release Notes:

- N/A

crates/language/src/buffer.rs

@@ -479,6 +479,7 @@ pub struct Chunk<'a> {
 }
 
 /// A set of edits to a given version of a buffer, computed asynchronously.
+#[derive(Debug)]
 pub struct Diff {
     pub(crate) base_version: clock::Global,
     line_ending: LineEnding,

crates/language/src/language.rs

@@ -602,13 +602,6 @@ pub struct LanguageConfig {
     /// or a whole-word search in buffer search.
     #[serde(default)]
     pub word_characters: HashSet<char>,
-    /// The name of a Prettier parser that should be used for this language.
-    #[serde(default)]
-    pub prettier_parser_name: Option<String>,
-    /// The names of any Prettier plugins that should be used for this language.
-    #[serde(default)]
-    pub prettier_plugins: Vec<Arc<str>>,
-
     /// Whether to indent lines using tab characters, as opposed to multiple
     /// spaces.
     #[serde(default)]
@@ -700,8 +693,6 @@ impl Default for LanguageConfig {
             scope_opt_in_language_servers: Default::default(),
             overrides: Default::default(),
             word_characters: Default::default(),
-            prettier_parser_name: None,
-            prettier_plugins: Default::default(),
             collapsed_placeholder: Default::default(),
             hard_tabs: Default::default(),
             tab_size: Default::default(),
@@ -1375,14 +1366,6 @@ impl Language {
         }
     }
 
-    pub fn prettier_parser_name(&self) -> Option<&str> {
-        self.config.prettier_parser_name.as_deref()
-    }
-
-    pub fn prettier_plugins(&self) -> &Vec<Arc<str>> {
-        &self.config.prettier_plugins
-    }
-
     pub fn lsp_id(&self) -> String {
         match self.config.name.as_ref() {
             "Plain Text" => "plaintext".to_string(),

crates/language/src/language_registry.rs

@@ -715,15 +715,6 @@ impl LanguageRegistry {
             .unwrap_or_default()
     }
 
-    pub fn all_prettier_plugins(&self) -> Vec<Arc<str>> {
-        let state = self.state.read();
-        state
-            .languages
-            .iter()
-            .flat_map(|language| language.config.prettier_plugins.iter().cloned())
-            .collect()
-    }
-
     pub fn update_lsp_status(
         &self,
         server_name: LanguageServerName,

crates/language/src/language_settings.rs

@@ -89,9 +89,7 @@ pub struct LanguageSettings {
     /// How to perform a buffer format.
     pub formatter: Formatter,
     /// Zed's Prettier integration settings.
-    /// If Prettier is enabled, Zed will use this for its Prettier instance for any applicable file, if
-    /// the project has no other Prettier installed.
-    pub prettier: HashMap<String, serde_json::Value>,
+    pub prettier: PrettierSettings,
     /// Whether to use language servers to provide code intelligence.
     pub enable_language_server: bool,
     /// The list of language servers to use (or disable) for this language.
@@ -267,12 +265,12 @@ pub struct LanguageSettingsContent {
     #[serde(default)]
     pub formatter: Option<Formatter>,
     /// Zed's Prettier integration settings.
-    /// If Prettier is enabled, Zed will use this for its Prettier instance for any applicable file, if
-    /// the project has no other Prettier installed.
+    /// Allows to enable/disable formatting with Prettier
+    /// and configure default Prettier, used when no project-level Prettier installation is found.
     ///
-    /// Default: {}
+    /// Default: off
     #[serde(default)]
-    pub prettier: Option<HashMap<String, serde_json::Value>>,
+    pub prettier: Option<PrettierSettings>,
     /// Whether to use language servers to provide code intelligence.
     ///
     /// Default: true
@@ -751,6 +749,30 @@ fn merge_settings(settings: &mut LanguageSettings, src: &LanguageSettingsContent
     merge(&mut settings.inlay_hints, src.inlay_hints);
 }
 
+/// Allows to enable/disable formatting with Prettier
+/// and configure default Prettier, used when no project-level Prettier installation is found.
+/// Prettier formatting is disabled by default.
+#[derive(Default, Debug, Clone, PartialEq, Eq, Serialize, Deserialize, JsonSchema)]
+pub struct PrettierSettings {
+    /// Enables or disables formatting with Prettier for a given language.
+    #[serde(default)]
+    pub allowed: bool,
+
+    /// Forces Prettier integration to use a specific parser name when formatting files with the language.
+    #[serde(default)]
+    pub parser: Option<String>,
+
+    /// Forces Prettier integration to use specific plugins when formatting files with the language.
+    /// The default Prettier will be installed with these plugins.
+    #[serde(default)]
+    pub plugins: HashSet<String>,
+
+    /// Default Prettier options, in the format as in package.json section for Prettier.
+    /// If project installs Prettier via its package.json, these options will be ignored.
+    #[serde(flatten)]
+    pub options: HashMap<String, serde_json::Value>,
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;