[rustc.git] / src / tools / clippy / src / docs / case_sensitive_file_extension_comparisons.txt

### What it does
Checks for calls to `ends_with` with possible file extensions
and suggests to use a case-insensitive approach instead.

### Why is this bad?
`ends_with` is case-sensitive and may not detect files with a valid extension.

### Example
```
fn is_rust_file(filename: &str) -> bool {
    filename.ends_with(".rs")
}
```
Use instead:
```
fn is_rust_file(filename: &str) -> bool {
    let filename = std::path::Path::new(filename);
    filename.extension()
        .map_or(false, |ext| ext.eq_ignore_ascii_case("rs"))
}
```
Commit	Line	Data
f2b60f7d FG	1	### What it does
	2	Checks for calls to `ends_with` with possible file extensions
	3	and suggests to use a case-insensitive approach instead.
	4
	5	### Why is this bad?
	6	`ends_with` is case-sensitive and may not detect files with a valid extension.
	7
	8	### Example
	9	```
	10	fn is_rust_file(filename: &str) -> bool {
	11	filename.ends_with(".rs")
	12	}
	13	```
	14	Use instead:
	15	```
	16	fn is_rust_file(filename: &str) -> bool {
	17	let filename = std::path::Path::new(filename);
	18	filename.extension()
	19	.map_or(false, \|ext\| ext.eq_ignore_ascii_case("rs"))
	20	}
	21	```