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use std::collections::VecDeque;
use diff;
use term;
use std::io;
#[derive(Debug, PartialEq)]
pub enum DiffLine {
Context(String),
Expected(String),
Resulting(String),
}
#[derive(Debug, PartialEq)]
pub struct Mismatch {
pub line_number: u32,
pub lines: Vec<DiffLine>,
}
impl Mismatch {
fn new(line_number: u32) -> Mismatch {
Mismatch {
line_number: line_number,
lines: Vec::new(),
}
}
}
// Produces a diff between the expected output and actual output of rustfmt.
pub fn make_diff(expected: &str, actual: &str, context_size: usize) -> Vec<Mismatch> {
let mut line_number = 1;
let mut context_queue: VecDeque<&str> = VecDeque::with_capacity(context_size);
let mut lines_since_mismatch = context_size + 1;
let mut results = Vec::new();
let mut mismatch = Mismatch::new(0);
for result in diff::lines(expected, actual) {
match result {
diff::Result::Left(str) => {
if lines_since_mismatch >= context_size {
results.push(mismatch);
mismatch = Mismatch::new(line_number - context_queue.len() as u32);
}
while let Some(line) = context_queue.pop_front() {
mismatch.lines.push(DiffLine::Context(line.to_owned()));
}
mismatch.lines.push(DiffLine::Resulting(str.to_owned()));
lines_since_mismatch = 0;
}
diff::Result::Right(str) => {
if lines_since_mismatch >= context_size {
results.push(mismatch);
mismatch = Mismatch::new(line_number - context_queue.len() as u32);
}
while let Some(line) = context_queue.pop_front() {
mismatch.lines.push(DiffLine::Context(line.to_owned()));
}
mismatch.lines.push(DiffLine::Expected(str.to_owned()));
line_number += 1;
lines_since_mismatch = 0;
}
diff::Result::Both(str, _) => {
if context_queue.len() >= context_size {
let _ = context_queue.pop_front();
}
if lines_since_mismatch < context_size {
mismatch.lines.push(DiffLine::Context(str.to_owned()));
} else {
context_queue.push_back(str);
}
line_number += 1;
lines_since_mismatch += 1;
}
}
}
results.push(mismatch);
results.remove(0);
results
}
pub fn print_diff<F>(diff: Vec<Mismatch>, get_section_title: F)
where F: Fn(u32) -> String
{
if let Some(t) = term::stdout() {
print_diff_fancy(diff, get_section_title, t);
} else {
print_diff_basic(diff, get_section_title);
}
}
fn print_diff_fancy<F>(diff: Vec<Mismatch>,
get_section_title: F,
mut t: Box<term::Terminal<Output = io::Stdout>>)
where F: Fn(u32) -> String
{
for mismatch in diff {
let title = get_section_title(mismatch.line_number);
writeln!(t, "{}", title).unwrap();
for line in mismatch.lines {
match line {
DiffLine::Context(ref str) => {
t.reset().unwrap();
writeln!(t, " {}⏎", str).unwrap();
}
DiffLine::Expected(ref str) => {
t.fg(term::color::GREEN).unwrap();
writeln!(t, "+{}⏎", str).unwrap();
}
DiffLine::Resulting(ref str) => {
t.fg(term::color::RED).unwrap();
writeln!(t, "-{}⏎", str).unwrap();
}
}
}
t.reset().unwrap();
}
}
pub fn print_diff_basic<F>(diff: Vec<Mismatch>, get_section_title: F)
where F: Fn(u32) -> String
{
for mismatch in diff {
let title = get_section_title(mismatch.line_number);
println!("{}", title);
for line in mismatch.lines {
match line {
DiffLine::Context(ref str) => {
println!(" {}⏎", str);
}
DiffLine::Expected(ref str) => {
println!("+{}⏎", str);
}
DiffLine::Resulting(ref str) => {
println!("-{}⏎", str);
}
}
}
}
}
|
