Flag FURB105 with starred kwargs (#7630)

crates/ruff_linter/resources/test/fixtures/refurb/FURB105.py

@@ -16,6 +16,7 @@ print("foo", "", sep="")
 print("foo", "", "bar", sep="")
 print("", *args)
 print("", *args, sep="")
+print("", **kwargs)
 
 # OK.
 
@@ -29,4 +30,3 @@ print("", "foo", sep=",")
 print("foo", "", sep=",")
 print("foo", "", "bar", "", sep=",")
 print("", "", **kwargs)
-print("", **kwargs)

crates/ruff_linter/src/rules/refurb/rules/print_empty_string.rs

@@ -57,27 +57,22 @@ impl Violation for PrintEmptyString {
 
 /// FURB105
 pub(crate) fn print_empty_string(checker: &mut Checker, call: &ast::ExprCall) {
-    // Avoid flagging, e.g., `print("", "", **kwargs)`.
-    if call
-        .arguments
-        .keywords
-        .iter()
-        .any(|keyword| keyword.arg.is_none())
-    {
-        return;
-    }
-
     if checker
         .semantic()
         .resolve_call_path(&call.func)
         .as_ref()
         .is_some_and(|call_path| matches!(call_path.as_slice(), ["", "print"]))
     {
-        // Ex) `print("", sep="")`
+        // Ex) `print("", sep="")` or `print("", "", **kwargs)`
         let empty_separator = call
             .arguments
             .find_keyword("sep")
-            .map_or(false, |keyword| is_empty_string(&keyword.value));
+            .map_or(false, |keyword| is_empty_string(&keyword.value))
+            && !call
+                .arguments
+                .keywords
+                .iter()
+                .any(|keyword| keyword.arg.is_none());
 
         // Avoid flagging, e.g., `print("", "", sep="sep")`
         if !empty_separator && call.arguments.args.len() != 1 {

crates/ruff_linter/src/rules/refurb/snapshots/ruff_linter__rules__refurb__tests__FURB105_FURB105.py.snap

@@ -291,7 +291,7 @@ FURB105.py:16:1: FURB105 [*] Unnecessary empty string passed to `print`
    16 |+print("foo", "bar", sep="")
 17 17 | print("", *args)
 18 18 | print("", *args, sep="")
-19 19 | 
+19 19 | print("", **kwargs)
 
 FURB105.py:18:1: FURB105 [*] Unnecessary empty string passed to `print`
    |
@@ -299,8 +299,7 @@ FURB105.py:18:1: FURB105 [*] Unnecessary empty string passed to `print`
 17 | print("", *args)
 18 | print("", *args, sep="")
    | ^^^^^^^^^^^^^^^^^^^^^^^^ FURB105
-19 | 
+19 | print("", **kwargs)
-20 | # OK.
    |
    = help: Remove empty string
 
@@ -310,8 +309,29 @@ FURB105.py:18:1: FURB105 [*] Unnecessary empty string passed to `print`
 17 17 | print("", *args)
 18    |-print("", *args, sep="")
    18 |+print(*args, sep="")
-19 19 | 
+19 19 | print("", **kwargs)
-20 20 | # OK.
+20 20 | 
-21 21 | 
+21 21 | # OK.
+
+FURB105.py:19:1: FURB105 [*] Unnecessary empty string passed to `print`
+   |
+17 | print("", *args)
+18 | print("", *args, sep="")
+19 | print("", **kwargs)
+   | ^^^^^^^^^^^^^^^^^^^ FURB105
+20 | 
+21 | # OK.
+   |
+   = help: Remove empty string
+
+ℹ Suggested fix
+16 16 | print("foo", "", "bar", sep="")
+17 17 | print("", *args)
+18 18 | print("", *args, sep="")
+19    |-print("", **kwargs)
+   19 |+print(**kwargs)
+20 20 | 
+21 21 | # OK.
+22 22 |