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extern crate difference;
extern crate file;
use std::path::{PathBuf, Path};
use std::fs::read_dir;
use difference::Changeset;
/// Read file and normalize newlines.
///
/// `rustc` seems to always normalize `\r\n` newlines to `\n`:
///
/// ```
/// let s = "
/// ";
/// assert_eq!(s.as_bytes(), &[10]);
/// ```
///
/// so this should always be correct.
fn read_text(path: &Path) -> String {
file::get_text(path).unwrap().replace("\r\n", "\n")
}
pub fn dir_tests<F>(
paths: &[&str],
f: F
)
where
F: Fn(&str) -> String
{
for path in collect_tests(paths) {
let actual = {
let text = read_text(&path);
f(&text)
};
let path = path.with_extension("txt");
if !path.exists() {
println!("\nfile: {}", path.display());
println!("No .txt file with expected result, creating...");
file::put_text(&path, actual).unwrap();
panic!("No expected result")
}
let expected = read_text(&path);
let expected = expected.as_str();
let actual = actual.as_str();
assert_equal_text(expected, actual, &path);
}
}
fn assert_equal_text(
expected: &str,
actual: &str,
path: &Path
) {
if expected != actual {
print_difference(expected, actual, path)
}
}
fn collect_tests(paths: &[&str]) -> Vec<PathBuf> {
paths.iter().flat_map(|path| {
let path = test_data_dir().join(path);
test_from_dir(&path).into_iter()
}).collect()
}
fn test_from_dir(dir: &Path) -> Vec<PathBuf> {
let mut acc = Vec::new();
for file in read_dir(&dir).unwrap() {
let file = file.unwrap();
let path = file.path();
if path.extension().unwrap_or_default() == "rs" {
acc.push(path);
}
}
acc.sort();
acc
}
fn print_difference(expected: &str, actual: &str, path: &Path) {
let dir = project_dir();
let path = path.strip_prefix(&dir).unwrap_or_else(|_| path);
println!("\nfile: {}", path.display());
if expected.trim() == actual.trim() {
println!("whitespace difference");
println!("rewriting the file");
file::put_text(path, actual).unwrap();
} else {
let changeset = Changeset::new(actual, expected, "\n");
println!("{}", changeset);
}
panic!("Comparison failed")
}
fn project_dir() -> PathBuf {
let dir = env!("CARGO_MANIFEST_DIR");
PathBuf::from(dir)
.parent().unwrap()
.parent().unwrap()
.to_owned()
}
fn test_data_dir() -> PathBuf {
project_dir().join("tests/data")
}
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