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.
14 use std::fs::{self, File};
15 use std::io::{self, BufWriter, Read, Write};
17 use strings::string_buffer::StringBuffer;
19 use checkstyle::{output_checkstyle_file, output_footer, output_header};
20 use config::{Config, NewlineStyle, WriteMode};
21 use rustfmt_diff::{make_diff, print_diff, Mismatch};
23 // A map of the files of a crate, with their new content
24 pub type FileMap = Vec<FileRecord>;
26 pub type FileRecord = (String, StringBuffer);
28 // Append a newline to the end of each file.
29 pub fn append_newline(s: &mut StringBuffer) {
33 pub fn write_all_files<T>(file_map: &FileMap, out: &mut T, config: &Config) -> Result<(), io::Error>
37 output_header(out, config.write_mode()).ok();
38 for &(ref filename, ref text) in file_map {
39 write_file(text, filename, out, config)?;
41 output_footer(out, config.write_mode()).ok();
46 // Prints all newlines either as `\n` or as `\r\n`.
47 pub fn write_system_newlines<T>(
51 ) -> Result<(), io::Error>
55 // Buffer output, since we're writing a since char at a time.
56 let mut writer = BufWriter::new(writer);
58 let style = if config.newline_style() == NewlineStyle::Native {
65 config.newline_style()
69 NewlineStyle::Unix => write!(writer, "{}", text),
70 NewlineStyle::Windows => {
71 for (c, _) in text.chars() {
73 '\n' => write!(writer, "\r\n")?,
75 c => write!(writer, "{}", c)?,
80 NewlineStyle::Native => unreachable!(),
89 ) -> Result<bool, io::Error>
93 fn source_and_formatted_text(
97 ) -> Result<(String, String), io::Error> {
98 let mut f = File::open(filename)?;
99 let mut ori_text = String::new();
100 f.read_to_string(&mut ori_text)?;
101 let mut v = Vec::new();
102 write_system_newlines(&mut v, text, config)?;
103 let fmt_text = String::from_utf8(v).unwrap();
104 Ok((ori_text, fmt_text))
111 ) -> Result<Vec<Mismatch>, io::Error> {
112 let (ori, fmt) = source_and_formatted_text(text, filename, config)?;
113 Ok(make_diff(&ori, &fmt, 3))
116 match config.write_mode() {
117 WriteMode::Replace => {
118 if let Ok((ori, fmt)) = source_and_formatted_text(text, filename, config) {
120 // Do a little dance to make writing safer - write to a temp file
121 // rename the original to a .bk, then rename the temp file to the
123 let tmp_name = filename.to_owned() + ".tmp";
124 let bk_name = filename.to_owned() + ".bk";
126 // Write text to temp file
127 let tmp_file = File::create(&tmp_name)?;
128 write_system_newlines(tmp_file, text, config)?;
131 fs::rename(filename, bk_name)?;
132 fs::rename(tmp_name, filename)?;
136 WriteMode::Overwrite => {
137 // Write text directly over original file if there is a diff.
138 let (source, formatted) = source_and_formatted_text(text, filename, config)?;
139 if source != formatted {
140 let file = File::create(filename)?;
141 write_system_newlines(file, text, config)?;
144 WriteMode::Plain => {
145 write_system_newlines(out, text, config)?;
147 WriteMode::Display | WriteMode::Coverage => {
148 println!("{}:\n", filename);
149 write_system_newlines(out, text, config)?;
152 if let Ok((ori, fmt)) = source_and_formatted_text(text, filename, config) {
153 let mismatch = make_diff(&ori, &fmt, 3);
154 let has_diff = !mismatch.is_empty();
155 print_diff(mismatch, |line_num| {
156 format!("Diff in {} at line {}:", filename, line_num)
161 WriteMode::Checkstyle => {
162 let diff = create_diff(filename, text, config)?;
163 output_checkstyle_file(out, filename, diff)?;
167 // when we are not in diff mode, don't indicate differing files