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// Copyright 2015 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
use std::fs;
use std::io::{self, Write};
use checkstyle::output_checkstyle_file;
use config::{Config, EmitMode, FileName, Verbosity};
use rustfmt_diff::{make_diff, output_modified, print_diff};
#[cfg(test)]
use formatting::FileRecord;
// Append a newline to the end of each file.
pub fn append_newline(s: &mut String) {
s.push_str("\n");
}
#[cfg(test)]
pub(crate) fn write_all_files<T>(
source_file: &[FileRecord],
out: &mut T,
config: &Config,
) -> Result<(), io::Error>
where
T: Write,
{
if config.emit_mode() == EmitMode::Checkstyle {
write!(out, "{}", ::checkstyle::header())?;
}
for &(ref filename, ref text) in source_file {
write_file(text, filename, out, config)?;
}
if config.emit_mode() == EmitMode::Checkstyle {
write!(out, "{}", ::checkstyle::footer())?;
}
Ok(())
}
pub fn write_file<T>(
formatted_text: &str,
filename: &FileName,
out: &mut T,
config: &Config,
) -> Result<bool, io::Error>
where
T: Write,
{
let filename_to_path = || match *filename {
FileName::Real(ref path) => path,
_ => panic!("cannot format `{}` and emit to files", filename),
};
match config.emit_mode() {
EmitMode::Files if config.make_backup() => {
let filename = filename_to_path();
let ori = fs::read_to_string(filename)?;
if ori != formatted_text {
// Do a little dance to make writing safer - write to a temp file
// rename the original to a .bk, then rename the temp file to the
// original.
let tmp_name = filename.with_extension("tmp");
let bk_name = filename.with_extension("bk");
fs::write(&tmp_name, formatted_text)?;
fs::rename(filename, bk_name)?;
fs::rename(tmp_name, filename)?;
}
}
EmitMode::Files => {
// Write text directly over original file if there is a diff.
let filename = filename_to_path();
let ori = fs::read_to_string(filename)?;
if ori != formatted_text {
fs::write(filename, formatted_text)?;
}
}
EmitMode::Stdout | EmitMode::Coverage => {
if config.verbose() != Verbosity::Quiet {
println!("{}:\n", filename);
}
write!(out, "{}", formatted_text)?;
}
EmitMode::ModifiedLines => {
let filename = filename_to_path();
let ori = fs::read_to_string(filename)?;
let mismatch = make_diff(&ori, formatted_text, 0);
let has_diff = !mismatch.is_empty();
output_modified(out, mismatch);
return Ok(has_diff);
}
EmitMode::Checkstyle => {
let filename = filename_to_path();
let ori = fs::read_to_string(filename)?;
let diff = make_diff(&ori, formatted_text, 3);
output_checkstyle_file(out, filename, diff)?;
}
EmitMode::Diff => {
let filename = filename_to_path();
let ori = fs::read_to_string(filename)?;
let mismatch = make_diff(&ori, formatted_text, 3);
let has_diff = !mismatch.is_empty();
print_diff(
mismatch,
|line_num| format!("Diff in {} at line {}:", filename.display(), line_num),
config,
);
return Ok(has_diff);
}
}
// when we are not in diff mode, don't indicate differing files
Ok(false)
}
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