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>(
34 file_map: &[FileRecord],
37 ) -> Result<(), io::Error>
41 output_header(out, config.write_mode()).ok();
42 for &(ref filename, ref text) in file_map {
43 write_file(text, filename, out, config)?;
45 output_footer(out, config.write_mode()).ok();
50 // Prints all newlines either as `\n` or as `\r\n`.
51 pub fn write_system_newlines<T>(
55 ) -> Result<(), io::Error>
59 // Buffer output, since we're writing a since char at a time.
60 let mut writer = BufWriter::new(writer);
62 let style = if config.newline_style() == NewlineStyle::Native {
69 config.newline_style()
73 NewlineStyle::Unix => write!(writer, "{}", text),
74 NewlineStyle::Windows => {
75 for (c, _) in text.chars() {
77 '\n' => write!(writer, "\r\n")?,
79 c => write!(writer, "{}", c)?,
84 NewlineStyle::Native => unreachable!(),
93 ) -> Result<bool, io::Error>
97 fn source_and_formatted_text(
101 ) -> Result<(String, String), io::Error> {
102 let mut f = File::open(filename)?;
103 let mut ori_text = String::new();
104 f.read_to_string(&mut ori_text)?;
105 let mut v = Vec::new();
106 write_system_newlines(&mut v, text, config)?;
107 let fmt_text = String::from_utf8(v).unwrap();
108 Ok((ori_text, fmt_text))
115 ) -> Result<Vec<Mismatch>, io::Error> {
116 let (ori, fmt) = source_and_formatted_text(text, filename, config)?;
117 Ok(make_diff(&ori, &fmt, 3))
120 match config.write_mode() {
121 WriteMode::Replace => {
122 if let Ok((ori, fmt)) = source_and_formatted_text(text, filename, config) {
124 // Do a little dance to make writing safer - write to a temp file
125 // rename the original to a .bk, then rename the temp file to the
127 let tmp_name = filename.to_owned() + ".tmp";
128 let bk_name = filename.to_owned() + ".bk";
130 // Write text to temp file
131 let tmp_file = File::create(&tmp_name)?;
132 write_system_newlines(tmp_file, text, config)?;
135 fs::rename(filename, bk_name)?;
136 fs::rename(tmp_name, filename)?;
140 WriteMode::Overwrite => {
141 // Write text directly over original file if there is a diff.
142 let (source, formatted) = source_and_formatted_text(text, filename, config)?;
143 if source != formatted {
144 let file = File::create(filename)?;
145 write_system_newlines(file, text, config)?;
148 WriteMode::Plain => {
149 write_system_newlines(out, text, config)?;
151 WriteMode::Display | WriteMode::Coverage => {
152 println!("{}:\n", filename);
153 write_system_newlines(out, text, config)?;
156 if let Ok((ori, fmt)) = source_and_formatted_text(text, filename, config) {
157 let mismatch = make_diff(&ori, &fmt, 3);
158 let has_diff = !mismatch.is_empty();
161 |line_num| format!("Diff in {} at line {}:", filename, line_num),
167 WriteMode::Checkstyle => {
168 let diff = create_diff(filename, text, config)?;
169 output_checkstyle_file(out, filename, diff)?;
173 // when we are not in diff mode, don't indicate differing files