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use atty::Stream;
use similar::{ChangeTag, TextDiff};
use termcolor::{Color, ColorChoice, ColorSpec, StandardStream, WriteColor};
pub fn trim_trailing_space(s: &str) -> String {
let mut lines: Vec<_> = s.lines().map(|line| line.trim_end()).collect();
while lines.last().map_or(false, |l| l.is_empty()) {
lines.pop();
}
lines.join("\n")
}
pub fn print_diff(expected: &str, actual: &str) {
let color_choice = if atty::is(Stream::Stderr) {
ColorChoice::Auto
} else {
ColorChoice::Never
};
let mut stderr = StandardStream::stderr(color_choice);
let diff = TextDiff::from_lines(expected, actual);
println!("--- expected");
println!("+++ actual");
for op in diff.ops() {
for change in diff.iter_changes(op) {
let sign = match change.tag() {
ChangeTag::Delete => {
let _ = stderr.set_color(ColorSpec::new().set_fg(Some(Color::Red)));
"-"
}
ChangeTag::Insert => {
let _ = stderr.set_color(ColorSpec::new().set_fg(Some(Color::Green)));
"+"
}
ChangeTag::Equal => " ",
};
print!("{}{}", sign, change);
let _ = stderr.reset();
}
}
}