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