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print_with_newline / write_with_newline: don't warn about string with several `\n`s in them. 

Fixes #3126
This commit is contained in:
Matthias Krüger 2018-09-06 12:55:04 +02:00
parent 0a8ceaf8b0
commit a0f56edfc3
3 changed files with 12 additions and 2 deletions
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10
clippy_lints/src/write.rs
View File

@ -195,7 +195,10 @@ impl EarlyLintPass for Pass {
} else if mac.node.path == "print" {
span_lint(cx, PRINT_STDOUT, mac.span, "use of `print!`");
if let Some(fmtstr) = check_tts(cx, &mac.node.tts, false).0 {
if fmtstr.ends_with("\\n") && !fmtstr.ends_with("\\n\\n") {
if fmtstr.ends_with("\\n") &&
// don't warn about strings with several `\n`s (#3126)
fmtstr.matches("\\n").count() == 1
{
span_lint(
cx,
PRINT_WITH_NEWLINE,
@ -207,7 +210,10 @@ impl EarlyLintPass for Pass {
}
} else if mac.node.path == "write" {
if let Some(fmtstr) = check_tts(cx, &mac.node.tts, true).0 {
if fmtstr.ends_with("\\n") && !fmtstr.ends_with("\\n\\n") {
if fmtstr.ends_with("\\n") &&
// don't warn about strings with several `\n`s (#3126)
fmtstr.matches("\\n").count() == 1
{
span_lint(
cx,
WRITE_WITH_NEWLINE,

2
tests/ui/print_with_newline.rs
View File

@ -21,4 +21,6 @@ fn main() {
print!("\n\n");
print!("like eof\n\n");
print!("Hello {} {}\n\n", "world", "#2");
println!("\ndon't\nwarn\nfor\nmultiple\nnewlines\n"); // #3126
println!("\nbla\n\n"); // #3126
}

2
tests/ui/write_with_newline.rs
View File

@ -26,4 +26,6 @@ fn main() {
write!(&mut v, "\n\n");
write!(&mut v, "like eof\n\n");
write!(&mut v, "Hello {} {}\n\n", "world", "#2");
writeln!(&mut v, "\ndon't\nwarn\nfor\nmultiple\nnewlines\n"); // #3126
writeln!(&mut v, "\nbla\n\n"); // #3126
}