Flip on typing config to be opt-in, better defaults

Author: Veykril

src/tools/rust-analyzer/crates/ide/src/lib.rs

@@ -404,17 +404,11 @@ impl Analysis {
         &self,
         position: FilePosition,
         char_typed: char,
-        chars_to_exclude: Option<String>,
     ) -> Cancellable<Option<SourceChange>> {
         // Fast path to not even parse the file.
         if !typing::TRIGGER_CHARS.contains(char_typed) {
             return Ok(None);
         }
-        if let Some(chars_to_exclude) = chars_to_exclude {
-            if chars_to_exclude.contains(char_typed) {
-                return Ok(None);
-            }
-        }
 
         self.with_db(|db| typing::on_char_typed(db, position, char_typed))
     }

src/tools/rust-analyzer/crates/rust-analyzer/src/config.rs

@@ -326,8 +326,16 @@ config_data! {
         /// Show documentation.
         signatureInfo_documentation_enable: bool                       = true,
 
-        /// Specify the characters to exclude from triggering typing assists. The default trigger characters are `.`, `=`, `<`, `>`, `{`, and `(`.
-        typing_excludeChars: Option<String> = Some("|<".to_owned()),
+        /// Specify the characters allowed to invoke special on typing triggers.
+        /// - typing `=` after `let` tries to smartly add `;` if `=` is followed by an existing expression
+        /// - typing `=` between two expressions adds `;` when in statement position
+        /// - typing `=` to turn an assignment into an equality comparison removes `;` when in expression position
+        /// - typing `.` in a chain method call auto-indents
+        /// - typing `{` or `(` in front of an expression inserts a closing `}` or `)` after the expression
+        /// - typing `{` in a use item adds a closing `}` in the right place
+        /// - typing `>` to complete a return type `->` will insert a whitespace after it
+        /// - typing `<` in a path or type position inserts a closing `>` after the path or type.
+        typing_triggerChars: Option<String> = Some("=.".to_owned()),
 
 
         /// Enables automatic discovery of projects using [`DiscoverWorkspaceConfig::command`].
@@ -2251,8 +2259,8 @@ impl Config {
         }
     }
 
-    pub fn typing_exclude_chars(&self) -> Option<String> {
-        self.typing_excludeChars().clone()
+    pub fn typing_trigger_chars(&self) -> &str {
+        self.typing_triggerChars().as_deref().unwrap_or_default()
     }
 
     // VSCode is our reference implementation, so we allow ourselves to work around issues by

src/tools/rust-analyzer/crates/rust-analyzer/src/handlers/request.rs

@@ -434,29 +434,24 @@ pub(crate) fn handle_on_type_formatting(
     params: lsp_types::DocumentOnTypeFormattingParams,
 ) -> anyhow::Result<Option<Vec<lsp_ext::SnippetTextEdit>>> {
     let _p = tracing::info_span!("handle_on_type_formatting").entered();
+    let char_typed = params.ch.chars().next().unwrap_or('\0');
+    if !snap.config.typing_trigger_chars().contains(char_typed) {
+        return Ok(None);
+    }
+
     let mut position = from_proto::file_position(&snap, params.text_document_position)?;
     let line_index = snap.file_line_index(position.file_id)?;
 
     // in `ide`, the `on_type` invariant is that
     // `text.char_at(position) == typed_char`.
     position.offset -= TextSize::of('.');
-    let char_typed = params.ch.chars().next().unwrap_or('\0');
 
     let text = snap.analysis.file_text(position.file_id)?;
     if stdx::never!(!text[usize::from(position.offset)..].starts_with(char_typed)) {
         return Ok(None);
     }
 
-    // We have an assist that inserts ` ` after typing `->` in `fn foo() ->{`,
-    // but it requires precise cursor positioning to work, and one can't
-    // position the cursor with on_type formatting. So, let's just toggle this
-    // feature off here, hoping that we'll enable it one day, 😿.
-    if char_typed == '>' {
-        return Ok(None);
-    }
-    let chars_to_exclude = snap.config.typing_exclude_chars();
-
-    let edit = snap.analysis.on_char_typed(position, char_typed, chars_to_exclude)?;
+    let edit = snap.analysis.on_char_typed(position, char_typed)?;
     let edit = match edit {
         Some(it) => it,
         None => return Ok(None),

src/tools/rust-analyzer/docs/user/generated_config.adoc

@@ -1051,10 +1051,18 @@ Show full signature of the callable. Only shows parameters if disabled.
 --
 Show documentation.
 --
-[[rust-analyzer.typing.excludeChars]]rust-analyzer.typing.excludeChars (default: `"|<"`)::
-+
---
-Specify the characters to exclude from triggering typing assists. The default trigger characters are `.`, `=`, `<`, `>`, `{`, and `(`.
+[[rust-analyzer.typing.triggerChars]]rust-analyzer.typing.triggerChars (default: `"=."`)::
++
+--
+Specify the characters allowed to invoke special on typing triggers.
+- typing `=` after `let` tries to smartly add `;` if `=` is followed by an existing expression
+- typing `=` between two expressions adds `;` when in statement position
+- typing `=` to turn an assignment into an equality comparison removes `;` when in expression position
+- typing `.` in a chain method call auto-indents
+- typing `{` or `(` in front of an expression inserts a closing `}` or `)` after the expression
+- typing `{` in a use item adds a closing `}` in the right place
+- typing `>` to complete a return type `->` will insert a whitespace after it
+- typing `<` in a path or type position inserts a closing `>` after the path or type.
 --
 [[rust-analyzer.vfs.extraIncludes]]rust-analyzer.vfs.extraIncludes (default: `[]`)::
 +

src/tools/rust-analyzer/editors/code/package.json

@@ -2745,9 +2745,9 @@
             {
                 "title": "typing",
                 "properties": {
-                    "rust-analyzer.typing.excludeChars": {
-                        "markdownDescription": "Specify the characters to exclude from triggering typing assists. The default trigger characters are `.`, `=`, `<`, `>`, `{`, and `(`.",
-                        "default": "|<",
+                    "rust-analyzer.typing.triggerChars": {
+                        "markdownDescription": "Specify the characters allowed to invoke special on typing triggers.\n- typing `=` after `let` tries to smartly add `;` if `=` is followed by an existing expression\n- typing `=` between two expressions adds `;` when in statement position\n- typing `=` to turn an assignment into an equality comparison removes `;` when in expression position\n- typing `.` in a chain method call auto-indents\n- typing `{` or `(` in front of an expression inserts a closing `}` or `)` after the expression\n- typing `{` in a use item adds a closing `}` in the right place\n- typing `>` to complete a return type `->` will insert a whitespace after it\n- typing `<` in a path or type position inserts a closing `>` after the path or type.",
+                        "default": "=.",
                         "type": [
                             "null",
                             "string"