Use char for trigger character

crates/ide-completion/src/lib.rs

@@ -143,7 +143,7 @@ pub fn completions(
     db: &RootDatabase,
     config: &CompletionConfig,
     position: FilePosition,
-    trigger_character: Option<&str>,
+    trigger_character: Option<char>,
 ) -> Option<Completions> {
     let ctx = &CompletionContext::new(db, position, config)?;
     let mut acc = Completions::default();
@@ -151,7 +151,7 @@ pub fn completions(
     {
         let acc = &mut acc;
         // prevent `(` from triggering unwanted completion noise
-        if trigger_character != Some("(") {
+        if trigger_character != Some('(') {
             completions::attribute::complete_attribute(acc, ctx);
             completions::attribute::complete_derive(acc, ctx);
             completions::attribute::complete_known_attribute_input(acc, ctx);

crates/ide-completion/src/tests.rs

@@ -88,7 +88,7 @@ pub(crate) fn completion_list_no_kw(ra_fixture: &str) -> String {
 
 pub(crate) fn completion_list_with_trigger_character(
     ra_fixture: &str,
-    trigger_character: Option<&str>,
+    trigger_character: Option<char>,
 ) -> String {
     completion_list_with_config(TEST_CONFIG, ra_fixture, true, trigger_character)
 }
@@ -97,7 +97,7 @@ fn completion_list_with_config(
     config: CompletionConfig,
     ra_fixture: &str,
     include_keywords: bool,
-    trigger_character: Option<&str>,
+    trigger_character: Option<char>,
 ) -> String {
     // filter out all but one builtintype completion for smaller test outputs
     let items = get_all_items(config, ra_fixture, trigger_character);
@@ -225,7 +225,7 @@ pub(crate) fn check_pattern_is_applicable(code: &str, check: impl FnOnce(SyntaxE
 pub(crate) fn get_all_items(
     config: CompletionConfig,
     code: &str,
-    trigger_character: Option<&str>,
+    trigger_character: Option<char>,
 ) -> Vec<CompletionItem> {
     let (db, position) = position(code);
     let res = crate::completions(&db, &config, position, trigger_character)

crates/ide-completion/src/tests/fn_param.rs

@@ -7,8 +7,8 @@ fn check(ra_fixture: &str, expect: Expect) {
     expect.assert_eq(&actual);
 }
 
-fn check_with_trigger_character(ra_fixture: &str, trigger_character: Option<&str>, expect: Expect) {
-    let actual = completion_list_with_trigger_character(ra_fixture, trigger_character);
+fn check_with_trigger_character(ra_fixture: &str, trigger_character: char, expect: Expect) {
+    let actual = completion_list_with_trigger_character(ra_fixture, Some(trigger_character));
     expect.assert_eq(&actual)
 }
 
@@ -124,7 +124,7 @@ fn trigger_by_l_paren() {
         r#"
 fn foo($0)
 "#,
-        Some("("),
+        '(',
         expect![[]],
     )
 }

crates/ide-completion/src/tests/visibility.rs

@@ -8,8 +8,8 @@ fn check(ra_fixture: &str, expect: Expect) {
     expect.assert_eq(&actual)
 }
 
-fn check_with_trigger_character(ra_fixture: &str, trigger_character: Option<&str>, expect: Expect) {
-    let actual = completion_list_with_trigger_character(ra_fixture, trigger_character);
+fn check_with_trigger_character(ra_fixture: &str, trigger_character: char, expect: Expect) {
+    let actual = completion_list_with_trigger_character(ra_fixture, Some(trigger_character));
     expect.assert_eq(&actual)
 }
 
@@ -20,7 +20,7 @@ fn empty_pub() {
         r#"
 pub($0)
 "#,
-        Some("("),
+        '(',
         expect![[r#"
             kw crate
             kw in

crates/ide/src/lib.rs

@@ -548,7 +548,7 @@ impl Analysis {
         &self,
         config: &CompletionConfig,
         position: FilePosition,
-        trigger_character: Option<&str>,
+        trigger_character: Option<char>,
     ) -> Cancellable<Option<Vec<CompletionItem>>> {
         self.with_db(|db| {
             ide_completion::completions(db, config, position, trigger_character).map(Into::into)

crates/rust-analyzer/src/handlers.rs

@@ -796,9 +796,10 @@ pub(crate) fn handle_completion(
     let _p = profile::span("handle_completion");
     let text_document_position = params.text_document_position.clone();
     let position = from_proto::file_position(&snap, params.text_document_position)?;
-    let completion_trigger_character = params.context.and_then(|ctx| ctx.trigger_character);
+    let completion_trigger_character =
+        params.context.and_then(|ctx| ctx.trigger_character).and_then(|s| s.chars().next());
 
-    if Some(":") == completion_trigger_character.as_deref() {
+    if Some(':') == completion_trigger_character {
         let source_file = snap.analysis.parse(position.file_id)?;
         let left_token = source_file.syntax().token_at_offset(position.offset).left_biased();
         let completion_triggered_after_single_colon = match left_token {
@@ -814,7 +815,7 @@ pub(crate) fn handle_completion(
     let items = match snap.analysis.completions(
         completion_config,
         position,
-        completion_trigger_character.as_deref(),
+        completion_trigger_character,
     )? {
         None => return Ok(None),
         Some(items) => items,