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