Rename single_char_push_str to single_char_add_str

Author: ebroto

CHANGELOG.md

@@ -1939,8 +1939,8 @@ Released 2018-09-13
 [`should_assert_eq`]: https://rust-lang.github.io/rust-clippy/master/index.html#should_assert_eq
 [`should_implement_trait`]: https://rust-lang.github.io/rust-clippy/master/index.html#should_implement_trait
 [`similar_names`]: https://rust-lang.github.io/rust-clippy/master/index.html#similar_names
+[`single_char_add_str`]: https://rust-lang.github.io/rust-clippy/master/index.html#single_char_add_str
 [`single_char_pattern`]: https://rust-lang.github.io/rust-clippy/master/index.html#single_char_pattern
-[`single_char_push_str`]: https://rust-lang.github.io/rust-clippy/master/index.html#single_char_push_str
 [`single_component_path_imports`]: https://rust-lang.github.io/rust-clippy/master/index.html#single_component_path_imports
 [`single_element_loop`]: https://rust-lang.github.io/rust-clippy/master/index.html#single_element_loop
 [`single_match`]: https://rust-lang.github.io/rust-clippy/master/index.html#single_match

clippy_lints/src/lib.rs

@@ -713,8 +713,8 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         &methods::RESULT_MAP_OR_INTO_OPTION,
         &methods::SEARCH_IS_SOME,
         &methods::SHOULD_IMPLEMENT_TRAIT,
+        &methods::SINGLE_CHAR_ADD_STR,
         &methods::SINGLE_CHAR_PATTERN,
-        &methods::SINGLE_CHAR_PUSH_STR,
         &methods::SKIP_WHILE_NEXT,
         &methods::STRING_EXTEND_CHARS,
         &methods::SUSPICIOUS_MAP,
@@ -1438,8 +1438,8 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         LintId::of(&methods::RESULT_MAP_OR_INTO_OPTION),
         LintId::of(&methods::SEARCH_IS_SOME),
         LintId::of(&methods::SHOULD_IMPLEMENT_TRAIT),
+        LintId::of(&methods::SINGLE_CHAR_ADD_STR),
         LintId::of(&methods::SINGLE_CHAR_PATTERN),
-        LintId::of(&methods::SINGLE_CHAR_PUSH_STR),
         LintId::of(&methods::SKIP_WHILE_NEXT),
         LintId::of(&methods::STRING_EXTEND_CHARS),
         LintId::of(&methods::SUSPICIOUS_MAP),
@@ -1631,7 +1631,7 @@ pub fn register_plugins(store: &mut rustc_lint::LintStore, sess: &Session, conf:
         LintId::of(&methods::OPTION_MAP_OR_NONE),
         LintId::of(&methods::RESULT_MAP_OR_INTO_OPTION),
         LintId::of(&methods::SHOULD_IMPLEMENT_TRAIT),
-        LintId::of(&methods::SINGLE_CHAR_PUSH_STR),
+        LintId::of(&methods::SINGLE_CHAR_ADD_STR),
         LintId::of(&methods::STRING_EXTEND_CHARS),
         LintId::of(&methods::UNNECESSARY_FOLD),
         LintId::of(&methods::UNNECESSARY_LAZY_EVALUATIONS),

clippy_lints/src/methods/mod.rs

@@ -1290,8 +1290,8 @@ declare_clippy_lint! {
 }
 
 declare_clippy_lint! {
-    /// **What it does:** Warns when using `push_str` with a single-character string literal
-    /// where `push` with a `char` would work fine.
+    /// **What it does:** Warns when using `push_str`/`insert_str` with a single-character string literal
+    /// where `push`/`insert` with a `char` would work fine.
     ///
     /// **Why is this bad?** It's less clear that we are pushing a single character.
     ///
@@ -1300,16 +1300,18 @@ declare_clippy_lint! {
     /// **Example:**
     /// ```rust
     /// let mut string = String::new();
+    /// string.insert_str(0, "R");
     /// string.push_str("R");
     /// ```
     /// Could be written as
     /// ```rust
     /// let mut string = String::new();
+    /// string.insert(0, 'R');
     /// string.push('R');
     /// ```
-    pub SINGLE_CHAR_PUSH_STR,
+    pub SINGLE_CHAR_ADD_STR,
     style,
-    "`push_str()` used with a single-character string literal as parameter"
+    "`push_str()` or `insert_str()` used with a single-character string literal as parameter"
 }
 
 declare_clippy_lint! {
@@ -1390,7 +1392,7 @@ declare_lint_pass!(Methods => [
     INEFFICIENT_TO_STRING,
     NEW_RET_NO_SELF,
     SINGLE_CHAR_PATTERN,
-    SINGLE_CHAR_PUSH_STR,
+    SINGLE_CHAR_ADD_STR,
     SEARCH_IS_SOME,
     FILTER_NEXT,
     SKIP_WHILE_NEXT,
@@ -3248,7 +3250,7 @@ fn lint_single_char_push_string(cx: &LateContext<'_>, expr: &hir::Expr<'_>, args
         let sugg = format!("{}.push({})", base_string_snippet, extension_string);
         span_lint_and_sugg(
             cx,
-            SINGLE_CHAR_PUSH_STR,
+            SINGLE_CHAR_ADD_STR,
             expr.span,
             "calling `push_str()` using a single-character string literal",
             "consider using `push` with a character literal",
@@ -3268,7 +3270,7 @@ fn lint_single_char_insert_string(cx: &LateContext<'_>, expr: &hir::Expr<'_>, ar
         let sugg = format!("{}.insert({}, {})", base_string_snippet, pos_arg, extension_string);
         span_lint_and_sugg(
             cx,
-            SINGLE_CHAR_PUSH_STR,
+            SINGLE_CHAR_ADD_STR,
             expr.span,
             "calling `insert_str()` using a single-character string literal",
             "consider using `insert` with a character literal",

src/lintlist/mod.rs

@@ -2147,16 +2147,16 @@ vec![
         module: "non_expressive_names",
     },
     Lint {
-        name: "single_char_pattern",
-        group: "perf",
-        desc: "using a single-character str where a char could be used, e.g., `_.split(\"x\")`",
+        name: "single_char_add_str",
+        group: "style",
+        desc: "`push_str()` or `insert_str()` used with a single-character string literal as parameter",
         deprecation: None,
         module: "methods",
     },
     Lint {
-        name: "single_char_push_str",
-        group: "style",
-        desc: "`push_str()` used with a single-character string literal as parameter",
+        name: "single_char_pattern",
+        group: "perf",
+        desc: "using a single-character str where a char could be used, e.g., `_.split(\"x\")`",
         deprecation: None,
         module: "methods",
     },

tests/ui/single_char_insert_str.fixed renamed to tests/ui/single_char_add_str.fixed

@@ -1,5 +1,5 @@
 // run-rustfix
-#![warn(clippy::single_char_push_str)]
+#![warn(clippy::single_char_add_str)]
 
 macro_rules! get_string {
     () => {
@@ -8,6 +8,23 @@ macro_rules! get_string {
 }
 
 fn main() {
+    // `push_str` tests
+
+    let mut string = String::new();
+    string.push('R');
+    string.push('\'');
+
+    string.push('u');
+    string.push_str("st");
+    string.push_str("");
+    string.push('\x52');
+    string.push('\u{0052}');
+    string.push('a');
+
+    get_string!().push('ö');
+
+    // `insert_str` tests
+
     let mut string = String::new();
     string.insert(0, 'R');
     string.insert(1, '\'');

tests/ui/single_char_insert_str.rs renamed to tests/ui/single_char_add_str.rs

@@ -1,5 +1,5 @@
 // run-rustfix
-#![warn(clippy::single_char_push_str)]
+#![warn(clippy::single_char_add_str)]
 
 macro_rules! get_string {
     () => {
@@ -8,6 +8,23 @@ macro_rules! get_string {
 }
 
 fn main() {
+    // `push_str` tests
+
+    let mut string = String::new();
+    string.push_str("R");
+    string.push_str("'");
+
+    string.push('u');
+    string.push_str("st");
+    string.push_str("");
+    string.push_str("\x52");
+    string.push_str("\u{0052}");
+    string.push_str(r##"a"##);
+
+    get_string!().push_str("ö");
+
+    // `insert_str` tests
+
     let mut string = String::new();
     string.insert_str(0, "R");
     string.insert_str(1, "'");

tests/ui/single_char_add_str.stderr

@@ -0,0 +1,82 @@
+error: calling `push_str()` using a single-character string literal
+  --> $DIR/single_char_add_str.rs:14:5
+   |
+LL |     string.push_str("R");
+   |     ^^^^^^^^^^^^^^^^^^^^ help: consider using `push` with a character literal: `string.push('R')`
+   |
+   = note: `-D clippy::single-char-add-str` implied by `-D warnings`
+
+error: calling `push_str()` using a single-character string literal
+  --> $DIR/single_char_add_str.rs:15:5
+   |
+LL |     string.push_str("'");
+   |     ^^^^^^^^^^^^^^^^^^^^ help: consider using `push` with a character literal: `string.push('/'')`
+
+error: calling `push_str()` using a single-character string literal
+  --> $DIR/single_char_add_str.rs:20:5
+   |
+LL |     string.push_str("/x52");
+   |     ^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `push` with a character literal: `string.push('/x52')`
+
+error: calling `push_str()` using a single-character string literal
+  --> $DIR/single_char_add_str.rs:21:5
+   |
+LL |     string.push_str("/u{0052}");
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `push` with a character literal: `string.push('/u{0052}')`
+
+error: calling `push_str()` using a single-character string literal
+  --> $DIR/single_char_add_str.rs:22:5
+   |
+LL |     string.push_str(r##"a"##);
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `push` with a character literal: `string.push('a')`
+
+error: calling `push_str()` using a single-character string literal
+  --> $DIR/single_char_add_str.rs:24:5
+   |
+LL |     get_string!().push_str("ö");
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `push` with a character literal: `get_string!().push('ö')`
+
+error: calling `insert_str()` using a single-character string literal
+  --> $DIR/single_char_add_str.rs:29:5
+   |
+LL |     string.insert_str(0, "R");
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `insert` with a character literal: `string.insert(0, 'R')`
+
+error: calling `insert_str()` using a single-character string literal
+  --> $DIR/single_char_add_str.rs:30:5
+   |
+LL |     string.insert_str(1, "'");
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `insert` with a character literal: `string.insert(1, '/'')`
+
+error: calling `insert_str()` using a single-character string literal
+  --> $DIR/single_char_add_str.rs:35:5
+   |
+LL |     string.insert_str(0, "/x52");
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `insert` with a character literal: `string.insert(0, '/x52')`
+
+error: calling `insert_str()` using a single-character string literal
+  --> $DIR/single_char_add_str.rs:36:5
+   |
+LL |     string.insert_str(0, "/u{0052}");
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `insert` with a character literal: `string.insert(0, '/u{0052}')`
+
+error: calling `insert_str()` using a single-character string literal
+  --> $DIR/single_char_add_str.rs:38:5
+   |
+LL |     string.insert_str(x, r##"a"##);
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `insert` with a character literal: `string.insert(x, 'a')`
+
+error: calling `insert_str()` using a single-character string literal
+  --> $DIR/single_char_add_str.rs:40:5
+   |
+LL |     string.insert_str(Y, r##"a"##);
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `insert` with a character literal: `string.insert(Y, 'a')`
+
+error: calling `insert_str()` using a single-character string literal
+  --> $DIR/single_char_add_str.rs:42:5
+   |
+LL |     get_string!().insert_str(1, "?");
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ help: consider using `insert` with a character literal: `get_string!().insert(1, '?')`
+
+error: aborting due to 13 previous errors
+

tests/ui/single_char_insert_str.stderr

@@ -12,12 +12,6 @@ fn main() {
 
     let y = "x";
     x.split(y);
-    // Not yet testing for multi-byte characters
-    // Changing `r.len() == 1` to `r.chars().count() == 1` in `lint_clippy::single_char_pattern`
-    // should have done this but produced an ICE
-    //
-    // We may not want to suggest changing these anyway
-    // See: https://github.com/rust-lang/rust-clippy/issues/650#issuecomment-184328984
     x.split('ß');
     x.split('ℝ');
     x.split('💣');

tests/ui/single_char_pattern.fixed

@@ -12,12 +12,6 @@ fn main() {
 
     let y = "x";
     x.split(y);
-    // Not yet testing for multi-byte characters
-    // Changing `r.len() == 1` to `r.chars().count() == 1` in `lint_clippy::single_char_pattern`
-    // should have done this but produced an ICE
-    //
-    // We may not want to suggest changing these anyway
-    // See: https://github.com/rust-lang/rust-clippy/issues/650#issuecomment-184328984
     x.split("ß");
     x.split("ℝ");
     x.split("💣");