use std::fs::{self, File};
use std::io::{self, BufWriter, Read, Write};
use std::path::Path;
use checkstyle::{output_checkstyle_file, output_footer, output_header};
use config::{Config, NewlineStyle, WriteMode};
use rustfmt_diff::{make_diff, print_diff, Mismatch};
use syntax::codemap::FileName;
pub type FileMap = Vec<FileRecord>;
pub type FileRecord = (FileName, String);
pub fn append_newline(s: &mut String) {
s.push_str("\n");
}
pub fn write_all_files<T>(
file_map: &[FileRecord],
out: &mut T,
config: &Config,
) -> Result<(), io::Error>
where
T: Write,
{
output_header(out, config.write_mode()).ok();
for &(ref filename, ref text) in file_map {
write_file(text, filename, out, config)?;
}
output_footer(out, config.write_mode()).ok();
Ok(())
}
pub fn write_system_newlines<T>(writer: T, text: &str, config: &Config) -> Result<(), io::Error>
where
T: Write,
{
let mut writer = BufWriter::new(writer);
let style = if config.newline_style() == NewlineStyle::Native {
if cfg!(windows) {
NewlineStyle::Windows
} else {
NewlineStyle::Unix
}
} else {
config.newline_style()
};
match style {
NewlineStyle::Unix => write!(writer, "{}", text),
NewlineStyle::Windows => {
for c in text.chars() {
match c {
'\n' => write!(writer, "\r\n")?,
'\r' => continue,
c => write!(writer, "{}", c)?,
}
}
Ok(())
}
NewlineStyle::Native => unreachable!(),
}
}
pub fn write_file<T>(
text: &str,
filename: &FileName,
out: &mut T,
config: &Config,
) -> Result<bool, io::Error>
where
T: Write,
{
fn source_and_formatted_text(
text: &str,
filename: &Path,
config: &Config,
) -> Result<(String, String), io::Error> {
let mut f = File::open(filename)?;
let mut ori_text = String::new();
f.read_to_string(&mut ori_text)?;
let mut v = Vec::new();
write_system_newlines(&mut v, text, config)?;
let fmt_text = String::from_utf8(v).unwrap();
Ok((ori_text, fmt_text))
}
fn create_diff(
filename: &Path,
text: &str,
config: &Config,
) -> Result<Vec<Mismatch>, io::Error> {
let (ori, fmt) = source_and_formatted_text(text, filename, config)?;
Ok(make_diff(&ori, &fmt, 3))
}
let filename_to_path = || match *filename {
FileName::Real(ref path) => path,
_ => panic!("cannot format `{}` with WriteMode::Replace", filename),
};
match config.write_mode() {
WriteMode::Replace => {
let filename = filename_to_path();
if let Ok((ori, fmt)) = source_and_formatted_text(text, filename, config) {
if fmt != ori {
let tmp_name = filename.with_extension("tmp");
let bk_name = filename.with_extension("bk");
{
let tmp_file = File::create(&tmp_name)?;
write_system_newlines(tmp_file, text, config)?;
}
fs::rename(filename, bk_name)?;
fs::rename(tmp_name, filename)?;
}
}
}
WriteMode::Overwrite => {
let filename = filename_to_path();
let (source, formatted) = source_and_formatted_text(text, filename, config)?;
if source != formatted {
let file = File::create(filename)?;
write_system_newlines(file, text, config)?;
}
}
WriteMode::Plain => {
write_system_newlines(out, text, config)?;
}
WriteMode::Display | WriteMode::Coverage => {
println!("{}:\n", filename);
write_system_newlines(out, text, config)?;
}
WriteMode::Diff => {
let filename = filename_to_path();
if let Ok((ori, fmt)) = source_and_formatted_text(text, filename, config) {
let mismatch = make_diff(&ori, &fmt, 3);
let has_diff = !mismatch.is_empty();
print_diff(
mismatch,
|line_num| format!("Diff in {} at line {}:", filename.display(), line_num),
config.color(),
);
return Ok(has_diff);
}
}
WriteMode::Checkstyle => {
let filename = filename_to_path();
let diff = create_diff(filename, text, config)?;
output_checkstyle_file(out, filename, diff)?;
}
}
Ok(false)
}