119 lines
4.0 KiB
Rust
119 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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// TODO tests
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use strings::string_buffer::StringBuffer;
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use std::collections::HashMap;
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use std::fs::{self, File};
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use std::io::{self, Write, stdout};
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use WriteMode;
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use NewlineStyle;
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use config::Config;
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// A map of the files of a crate, with their new content
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pub type FileMap = HashMap<String, StringBuffer>;
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// Append a newline to the end of each file.
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pub fn append_newlines(file_map: &mut FileMap) {
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for (_, s) in file_map.iter_mut() {
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s.push_str("\n");
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}
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}
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pub fn write_all_files(file_map: &FileMap,
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mode: WriteMode,
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config: &Config)
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-> Result<(HashMap<String, String>), io::Error> {
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let mut result = HashMap::new();
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for filename in file_map.keys() {
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let one_result = try!(write_file(&file_map[filename], filename, mode, config));
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if let Some(r) = one_result {
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result.insert(filename.clone(), r);
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}
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}
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Ok(result)
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}
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fn write_file(text: &StringBuffer,
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filename: &str,
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mode: WriteMode,
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config: &Config)
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-> Result<Option<String>, io::Error> {
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// prints all newlines either as `\n` or as `\r\n`
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fn write_system_newlines<T>(mut writer: T,
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text: &StringBuffer,
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config: &Config)
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-> Result<(), io::Error>
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where T: Write
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{
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match config.newline_style {
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NewlineStyle::Unix => write!(writer, "{}", text),
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NewlineStyle::Windows => {
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for (c, _) in text.chars() {
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match c {
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'\n' => try!(write!(writer, "\r\n")),
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'\r' => continue,
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c => try!(write!(writer, "{}", c)),
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}
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}
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Ok(())
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}
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}
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}
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match mode {
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WriteMode::Replace => {
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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.to_owned() + ".tmp";
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let bk_name = filename.to_owned() + ".bk";
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{
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// Write text to temp file
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let tmp_file = try!(File::create(&tmp_name));
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try!(write_system_newlines(tmp_file, text, config));
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}
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try!(fs::rename(filename, bk_name));
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try!(fs::rename(tmp_name, filename));
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}
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WriteMode::Overwrite => {
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// Write text directly over original file.
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let file = try!(File::create(filename));
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try!(write_system_newlines(file, text, config));
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}
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WriteMode::NewFile(extn) => {
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let filename = filename.to_owned() + "." + extn;
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let file = try!(File::create(&filename));
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try!(write_system_newlines(file, text, config));
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}
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WriteMode::Display => {
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println!("{}:\n", filename);
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let stdout = stdout();
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let stdout_lock = stdout.lock();
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try!(write_system_newlines(stdout_lock, text, config));
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}
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WriteMode::Return(_) => {
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// io::Write is not implemented for String, working around with
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// Vec<u8>
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let mut v = Vec::new();
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try!(write_system_newlines(&mut v, text, config));
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// won't panic, we are writing correct utf8
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return Ok(Some(String::from_utf8(v).unwrap()));
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}
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}
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Ok(None)
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}
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