1 // Copyright 2015 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
13 use std::fs::{self, File};
14 use std::io::{self, BufWriter, Read, Write};
17 use checkstyle::output_checkstyle_file;
18 use config::{Config, NewlineStyle, WriteMode};
19 use rustfmt_diff::{make_diff, output_modified, print_diff, Mismatch};
20 use syntax::codemap::FileName;
25 // Append a newline to the end of each file.
26 pub fn append_newline(s: &mut String) {
31 pub(crate) fn write_all_files<T>(
32 file_map: &[FileRecord],
35 ) -> Result<(), io::Error>
39 if config.write_mode() == WriteMode::Checkstyle {
40 ::checkstyle::output_header(out)?;
42 for &(ref filename, ref text) in file_map {
43 write_file(text, filename, out, config)?;
45 if config.write_mode() == WriteMode::Checkstyle {
46 ::checkstyle::output_footer(out)?;
52 // Prints all newlines either as `\n` or as `\r\n`.
53 pub fn write_system_newlines<T>(writer: T, text: &str, config: &Config) -> Result<(), io::Error>
57 // Buffer output, since we're writing a since char at a time.
58 let mut writer = BufWriter::new(writer);
60 let style = if config.newline_style() == NewlineStyle::Native {
67 config.newline_style()
71 NewlineStyle::Unix => write!(writer, "{}", text),
72 NewlineStyle::Windows => {
73 for c in text.chars() {
75 '\n' => write!(writer, "\r\n")?,
77 c => write!(writer, "{}", c)?,
82 NewlineStyle::Native => unreachable!(),
91 ) -> Result<bool, io::Error>
95 fn source_and_formatted_text(
99 ) -> Result<(String, String), io::Error> {
100 let mut f = File::open(filename)?;
101 let mut ori_text = String::new();
102 f.read_to_string(&mut ori_text)?;
103 let mut v = Vec::new();
104 write_system_newlines(&mut v, text, config)?;
105 let fmt_text = String::from_utf8(v).unwrap();
106 Ok((ori_text, fmt_text))
113 ) -> Result<Vec<Mismatch>, io::Error> {
114 let (ori, fmt) = source_and_formatted_text(text, filename, config)?;
115 Ok(make_diff(&ori, &fmt, 3))
118 let filename_to_path = || match *filename {
119 FileName::Real(ref path) => path,
120 _ => panic!("cannot format `{}` with WriteMode::Replace", filename),
123 match config.write_mode() {
124 WriteMode::Replace => {
125 let filename = filename_to_path();
126 if let Ok((ori, fmt)) = source_and_formatted_text(text, filename, config) {
128 // Do a little dance to make writing safer - write to a temp file
129 // rename the original to a .bk, then rename the temp file to the
131 let tmp_name = filename.with_extension("tmp");
132 let bk_name = filename.with_extension("bk");
134 // Write text to temp file
135 let tmp_file = File::create(&tmp_name)?;
136 write_system_newlines(tmp_file, text, config)?;
139 fs::rename(filename, bk_name)?;
140 fs::rename(tmp_name, filename)?;
144 WriteMode::Overwrite => {
145 // Write text directly over original file if there is a diff.
146 let filename = filename_to_path();
147 let (source, formatted) = source_and_formatted_text(text, filename, config)?;
148 if source != formatted {
149 let file = File::create(filename)?;
150 write_system_newlines(file, text, config)?;
153 WriteMode::Plain => {
154 write_system_newlines(out, text, config)?;
156 WriteMode::Display | WriteMode::Coverage => {
157 println!("{}:\n", filename);
158 write_system_newlines(out, text, config)?;
161 let filename = filename_to_path();
162 if let Ok((ori, fmt)) = source_and_formatted_text(text, filename, config) {
163 let mismatch = make_diff(&ori, &fmt, 3);
164 let has_diff = !mismatch.is_empty();
167 |line_num| format!("Diff in {} at line {}:", filename.display(), line_num),
173 WriteMode::Modified => {
174 let filename = filename_to_path();
175 if let Ok((ori, fmt)) = source_and_formatted_text(text, filename, config) {
176 let mismatch = make_diff(&ori, &fmt, 0);
177 let has_diff = !mismatch.is_empty();
178 output_modified(out, mismatch);
182 WriteMode::Checkstyle => {
183 let filename = filename_to_path();
184 let diff = create_diff(filename, text, config)?;
185 output_checkstyle_file(out, filename, diff)?;
187 WriteMode::Check => {
188 let filename = filename_to_path();
189 if let Ok((ori, fmt)) = source_and_formatted_text(text, filename, config) {
190 let mismatch = make_diff(&ori, &fmt, 3);
191 let has_diff = !mismatch.is_empty();
194 |line_num| format!("Diff in {} at line {}:", filename.display(), line_num),
200 WriteMode::None => {}
203 // when we are not in diff mode, don't indicate differing files