-use std::collections::VecDeque;
+// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+use config::{Color, Config, Verbosity};
use diff;
+use std::collections::VecDeque;
+use std::io;
+use std::io::Write;
use term;
+use utils::use_colored_tty;
#[derive(Debug, PartialEq)]
pub enum DiffLine {
#[derive(Debug, PartialEq)]
pub struct Mismatch {
+ /// The line number in the formatted version.
pub line_number: u32,
+ /// The line number in the original version.
+ pub line_number_orig: u32,
+ /// The set of lines (context and old/new) in the mismatch.
pub lines: Vec<DiffLine>,
}
impl Mismatch {
- fn new(line_number: u32) -> Mismatch {
+ fn new(line_number: u32, line_number_orig: u32) -> Mismatch {
Mismatch {
- line_number: line_number,
+ line_number,
+ line_number_orig,
lines: Vec::new(),
}
}
}
+// This struct handles writing output to stdout and abstracts away the logic
+// of printing in color, if it's possible in the executing environment.
+pub struct OutputWriter {
+ terminal: Option<Box<term::Terminal<Output = io::Stdout>>>,
+}
+
+impl OutputWriter {
+ // Create a new OutputWriter instance based on the caller's preference
+ // for colorized output and the capabilities of the terminal.
+ pub fn new(color: Color) -> Self {
+ if let Some(t) = term::stdout() {
+ if use_colored_tty(color) && t.supports_color() {
+ return OutputWriter { terminal: Some(t) };
+ }
+ }
+ OutputWriter { terminal: None }
+ }
+
+ // Write output in the optionally specified color. The output is written
+ // in the specified color if this OutputWriter instance contains a
+ // Terminal in its `terminal` field.
+ pub fn writeln(&mut self, msg: &str, color: Option<term::color::Color>) {
+ match &mut self.terminal {
+ Some(ref mut t) => {
+ if let Some(color) = color {
+ t.fg(color).unwrap();
+ }
+ writeln!(t, "{}", msg).unwrap();
+ if color.is_some() {
+ t.reset().unwrap();
+ }
+ }
+ None => println!("{}", msg),
+ }
+ }
+}
+
// 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 line_number_orig = 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);
+ let mut mismatch = Mismatch::new(0, 0);
for result in diff::lines(expected, actual) {
match result {
diff::Result::Left(str) => {
- if lines_since_mismatch >= context_size {
+ if lines_since_mismatch >= context_size && lines_since_mismatch > 0 {
results.push(mismatch);
- mismatch = Mismatch::new(line_number - context_queue.len() as u32);
+ mismatch = Mismatch::new(
+ line_number - context_queue.len() as u32,
+ line_number_orig - context_queue.len() as u32,
+ );
}
while let Some(line) = context_queue.pop_front() {
}
mismatch.lines.push(DiffLine::Resulting(str.to_owned()));
+ line_number_orig += 1;
lines_since_mismatch = 0;
}
diff::Result::Right(str) => {
- if lines_since_mismatch >= context_size {
+ if lines_since_mismatch >= context_size && lines_since_mismatch > 0 {
results.push(mismatch);
- mismatch = Mismatch::new(line_number - context_queue.len() as u32);
+ mismatch = Mismatch::new(
+ line_number - context_queue.len() as u32,
+ line_number_orig - context_queue.len() as u32,
+ );
}
while let Some(line) = context_queue.pop_front() {
if lines_since_mismatch < context_size {
mismatch.lines.push(DiffLine::Context(str.to_owned()));
- } else {
+ } else if context_size > 0 {
context_queue.push_back(str);
}
line_number += 1;
+ line_number_orig += 1;
lines_since_mismatch += 1;
}
}
results
}
-pub fn print_diff<F>(diff: Vec<Mismatch>, get_section_title: F)
- where F: Fn(u32) -> String
+pub fn print_diff<F>(diff: Vec<Mismatch>, get_section_title: F, config: &Config)
+where
+ F: Fn(u32) -> String,
{
- let mut t = term::stdout().unwrap();
+ let color = config.color();
+ let line_terminator = if config.verbose() == Verbosity::Verbose {
+ "⏎"
+ } else {
+ ""
+ };
+
+ let mut writer = OutputWriter::new(color);
for mismatch in diff {
let title = get_section_title(mismatch.line_number);
- writeln!(t, "{}", title).unwrap();
+ writer.writeln(&title, None);
for line in mismatch.lines {
match line {
DiffLine::Context(ref str) => {
- t.reset().unwrap();
- writeln!(t, " {}⏎", str).unwrap();
+ writer.writeln(&format!(" {}{}", str, line_terminator), None)
}
+ DiffLine::Expected(ref str) => writer.writeln(
+ &format!("+{}{}", str, line_terminator),
+ Some(term::color::GREEN),
+ ),
+ DiffLine::Resulting(ref str) => writer.writeln(
+ &format!("-{}{}", str, line_terminator),
+ Some(term::color::RED),
+ ),
+ }
+ }
+ }
+}
+
+/// Convert a Mismatch into a serialised form which just includes
+/// enough information to modify the original file.
+/// Each section starts with a line with three integers, space separated:
+/// lineno num_removed num_added
+/// followed by (num_added) lines of added text. The line numbers are
+/// relative to the original file.
+pub fn output_modified<W>(mut out: W, diff: Vec<Mismatch>)
+where
+ W: Write,
+{
+ for mismatch in diff {
+ let (num_removed, num_added) = mismatch.lines.iter().fold((0, 0), |(rem, add), line| {
+ match *line {
+ DiffLine::Context(_) => panic!("No Context expected"),
+ DiffLine::Expected(_) => (rem, add + 1),
+ DiffLine::Resulting(_) => (rem + 1, add),
+ }
+ });
+ // Write a header with enough information to separate the modified lines.
+ writeln!(
+ out,
+ "{} {} {}",
+ mismatch.line_number_orig, num_removed, num_added
+ ).unwrap();
+
+ for line in mismatch.lines {
+ match line {
+ DiffLine::Context(_) | DiffLine::Resulting(_) => (),
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();
+ writeln!(out, "{}", str).unwrap();
}
}
}
- t.reset().unwrap();
+ }
+}
+
+#[cfg(test)]
+mod test {
+ use super::DiffLine::*;
+ use super::{make_diff, Mismatch};
+
+ #[test]
+ fn diff_simple() {
+ let src = "one\ntwo\nthree\nfour\nfive\n";
+ let dest = "one\ntwo\ntrois\nfour\nfive\n";
+ let diff = make_diff(src, dest, 1);
+ assert_eq!(
+ diff,
+ vec![Mismatch {
+ line_number: 2,
+ line_number_orig: 2,
+ lines: vec![
+ Context("two".to_owned()),
+ Resulting("three".to_owned()),
+ Expected("trois".to_owned()),
+ Context("four".to_owned()),
+ ],
+ }]
+ );
+ }
+
+ #[test]
+ fn diff_simple2() {
+ let src = "one\ntwo\nthree\nfour\nfive\nsix\nseven\n";
+ let dest = "one\ntwo\ntrois\nfour\ncinq\nsix\nseven\n";
+ let diff = make_diff(src, dest, 1);
+ assert_eq!(
+ diff,
+ vec![
+ Mismatch {
+ line_number: 2,
+ line_number_orig: 2,
+ lines: vec![
+ Context("two".to_owned()),
+ Resulting("three".to_owned()),
+ Expected("trois".to_owned()),
+ Context("four".to_owned()),
+ ],
+ },
+ Mismatch {
+ line_number: 5,
+ line_number_orig: 5,
+ lines: vec![
+ Resulting("five".to_owned()),
+ Expected("cinq".to_owned()),
+ Context("six".to_owned()),
+ ],
+ },
+ ]
+ );
+ }
+
+ #[test]
+ fn diff_zerocontext() {
+ let src = "one\ntwo\nthree\nfour\nfive\n";
+ let dest = "one\ntwo\ntrois\nfour\nfive\n";
+ let diff = make_diff(src, dest, 0);
+ assert_eq!(
+ diff,
+ vec![Mismatch {
+ line_number: 3,
+ line_number_orig: 3,
+ lines: vec![Resulting("three".to_owned()), Expected("trois".to_owned())],
+ }]
+ );
+ }
+
+ #[test]
+ fn diff_trailing_newline() {
+ let src = "one\ntwo\nthree\nfour\nfive";
+ let dest = "one\ntwo\nthree\nfour\nfive\n";
+ let diff = make_diff(src, dest, 1);
+ assert_eq!(
+ diff,
+ vec![Mismatch {
+ line_number: 5,
+ line_number_orig: 5,
+ lines: vec![Context("five".to_owned()), Expected("".to_owned())],
+ }]
+ );
}
}
projects / rust.git / blobdiff