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 strings::string_buffer::StringBuffer;
16 use std::fs::{self, File};
17 use std::io::{self, Write, Read, stdout, BufWriter};
19 use config::{NewlineStyle, Config, WriteMode};
20 use rustfmt_diff::{make_diff, print_diff, Mismatch};
21 use checkstyle::{output_header, output_footer, output_checkstyle_file};
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>
36 output_header(out, config.write_mode).ok();
37 for &(ref filename, ref text) in file_map {
38 try!(write_file(text, filename, out, config));
40 output_footer(out, config.write_mode).ok();
45 // Prints all newlines either as `\n` or as `\r\n`.
46 pub fn write_system_newlines<T>(writer: T,
49 -> Result<(), io::Error>
52 // Buffer output, since we're writing a since char at a time.
53 let mut writer = BufWriter::new(writer);
55 let style = if config.newline_style == NewlineStyle::Native {
66 NewlineStyle::Unix => write!(writer, "{}", text),
67 NewlineStyle::Windows => {
68 for (c, _) in text.chars() {
70 '\n' => try!(write!(writer, "\r\n")),
72 c => try!(write!(writer, "{}", c)),
77 NewlineStyle::Native => unreachable!(),
81 pub fn write_file<T>(text: &StringBuffer,
85 -> Result<bool, io::Error>
89 fn source_and_formatted_text(text: &StringBuffer,
92 -> Result<(String, String), io::Error> {
93 let mut f = try!(File::open(filename));
94 let mut ori_text = String::new();
95 try!(f.read_to_string(&mut ori_text));
96 let mut v = Vec::new();
97 try!(write_system_newlines(&mut v, text, config));
98 let fmt_text = String::from_utf8(v).unwrap();
99 Ok((ori_text, fmt_text))
102 fn create_diff(filename: &str,
105 -> Result<Vec<Mismatch>, io::Error> {
106 let (ori, fmt) = try!(source_and_formatted_text(text, filename, config));
107 Ok(make_diff(&ori, &fmt, 3))
110 match config.write_mode {
111 WriteMode::Replace => {
112 if let Ok((ori, fmt)) = source_and_formatted_text(text, filename, config) {
114 // Do a little dance to make writing safer - write to a temp file
115 // rename the original to a .bk, then rename the temp file to the
117 let tmp_name = filename.to_owned() + ".tmp";
118 let bk_name = filename.to_owned() + ".bk";
120 // Write text to temp file
121 let tmp_file = try!(File::create(&tmp_name));
122 try!(write_system_newlines(tmp_file, text, config));
125 try!(fs::rename(filename, bk_name));
126 try!(fs::rename(tmp_name, filename));
130 WriteMode::Overwrite => {
131 // Write text directly over original file.
132 let file = try!(File::create(filename));
133 try!(write_system_newlines(file, text, config));
135 WriteMode::Plain => {
136 let stdout = stdout();
137 let stdout = stdout.lock();
138 try!(write_system_newlines(stdout, text, config));
140 WriteMode::Display | WriteMode::Coverage => {
141 println!("{}:\n", filename);
142 let stdout = stdout();
143 let stdout = stdout.lock();
144 try!(write_system_newlines(stdout, text, config));
147 println!("Diff of {}:\n", filename);
148 if let Ok((ori, fmt)) = source_and_formatted_text(text, filename, config) {
149 let mismatch = make_diff(&ori, &fmt, 3);
150 let has_diff = !mismatch.is_empty();
151 print_diff(mismatch, |line_num| format!("\nDiff at line {}:", line_num));
155 WriteMode::Checkstyle => {
156 let diff = try!(create_diff(filename, text, config));
157 try!(output_checkstyle_file(out, filename, diff));
161 // when we are not in diff mode, don't indicate differing files