Auto merge of #21543 - alexcrichton:old-io, r=alexcrichton

In preparation for the I/O rejuvination of the standard library, this commit
renames the current `io` module to `old_io` in order to make room for the new
I/O modules. It is expected that the I/O RFCs will land incrementally over time
instead of all at once, and this provides a fresh clean path for new modules to
enter into as well as guaranteeing that all old infrastructure will remain in
place for some time.

As each `old_io` module is replaced it will be deprecated in-place for new
structures in `std::{io, fs, net}` (as appropriate).

This commit does *not* leave a reexport of `old_io as io` as the deprecation
lint does not currently warn on this form of use. This is quite a large breaking
change for all imports in existing code, but all functionality is retained
precisely as-is and path statements simply need to be renamed from `io` to
`old_io`.

[breaking-change]

Author: bors

Diff for: src/compiletest/compiletest.rs

@@ -24,8 +24,8 @@ extern crate getopts;
 extern crate log;
 
 use std::os;
-use std::io;
-use std::io::fs;
+use std::old_io;
+use std::old_io::fs;
 use std::str::FromStr;
 use std::thunk::Thunk;
 use getopts::{optopt, optflag, reqopt};
@@ -237,7 +237,7 @@ pub fn run_tests(config: &Config) {
     // sadly osx needs some file descriptor limits raised for running tests in
     // parallel (especially when we have lots and lots of child processes).
     // For context, see #8904
-    io::test::raise_fd_limit();
+    old_io::test::raise_fd_limit();
     // Prevent issue #21352 UAC blocking .exe containing 'patch' etc. on Windows
     // If #11207 is resolved (adding manifest to .exe) this becomes unnecessary
     os::setenv("__COMPAT_LAYER", "RunAsInvoker");

Diff for: src/compiletest/errors.rs

@@ -9,7 +9,7 @@
 // except according to those terms.
 use self::WhichLine::*;
 
-use std::io::{BufferedReader, File};
+use std::old_io::{BufferedReader, File};
 
 pub struct ExpectedError {
     pub line: uint,

Diff for: src/compiletest/header.rs

@@ -223,7 +223,7 @@ pub fn is_test_ignored(config: &Config, testfile: &Path) -> bool {
 fn iter_header<F>(testfile: &Path, mut it: F) -> bool where
     F: FnMut(&str) -> bool,
 {
-    use std::io::{BufferedReader, File};
+    use std::old_io::{BufferedReader, File};
 
     let mut rdr = BufferedReader::new(File::open(testfile).unwrap());
     for ln in rdr.lines() {

Diff for: src/compiletest/procsrv.rs

@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-use std::io::process::{ProcessExit, Command, Process, ProcessOutput};
+use std::old_io::process::{ProcessExit, Command, Process, ProcessOutput};
 use std::dynamic_lib::DynamicLibrary;
 
 fn add_target_env(cmd: &mut Command, lib_path: &str, aux_path: Option<&str>) {
@@ -47,7 +47,7 @@ pub fn run(lib_path: &str,
     match cmd.spawn() {
         Ok(mut process) => {
             for input in input.iter() {
-                process.stdin.as_mut().unwrap().write(input.as_bytes()).unwrap();
+                process.stdin.as_mut().unwrap().write_all(input.as_bytes()).unwrap();
             }
             let ProcessOutput { status, output, error } =
                 process.wait_with_output().unwrap();
@@ -79,7 +79,7 @@ pub fn run_background(lib_path: &str,
     match cmd.spawn() {
         Ok(mut process) => {
             for input in input.iter() {
-                process.stdin.as_mut().unwrap().write(input.as_bytes()).unwrap();
+                process.stdin.as_mut().unwrap().write_all(input.as_bytes()).unwrap();
             }
 
             Some(process)

Diff for: src/compiletest/runtest.rs

@@ -23,14 +23,14 @@ use util;
 
 #[cfg(target_os = "windows")]
 use std::ascii::AsciiExt;
-use std::io::File;
-use std::io::fs::PathExtensions;
-use std::io::fs;
-use std::io::net::tcp;
-use std::io::process::ProcessExit;
-use std::io::process;
-use std::io::timer;
-use std::io;
+use std::old_io::File;
+use std::old_io::fs::PathExtensions;
+use std::old_io::fs;
+use std::old_io::net::tcp;
+use std::old_io::process::ProcessExit;
+use std::old_io::process;
+use std::old_io::timer;
+use std::old_io;
 use std::os;
 use std::iter::repeat;
 use std::str;
@@ -619,7 +619,7 @@ fn find_rust_src_root(config: &Config) -> Option<Path> {
 }
 
 fn run_debuginfo_lldb_test(config: &Config, props: &TestProps, testfile: &Path) {
-    use std::io::process::{Command, ProcessOutput};
+    use std::old_io::process::{Command, ProcessOutput};
 
     if config.lldb_python_dir.is_none() {
         fatal("Can't run LLDB test because LLDB's python path is not set.");
@@ -764,7 +764,7 @@ struct DebuggerCommands {
 
 fn parse_debugger_commands(file_path: &Path, debugger_prefix: &str)
                            -> DebuggerCommands {
-    use std::io::{BufferedReader, File};
+    use std::old_io::{BufferedReader, File};
 
     let command_directive = format!("{}-command", debugger_prefix);
     let check_directive = format!("{}-check", debugger_prefix);
@@ -1224,7 +1224,7 @@ fn compose_and_run_compiler(
 
 fn ensure_dir(path: &Path) {
     if path.is_dir() { return; }
-    fs::mkdir(path, io::USER_RWX).unwrap();
+    fs::mkdir(path, old_io::USER_RWX).unwrap();
 }
 
 fn compose_and_run(config: &Config, testfile: &Path,
@@ -1401,7 +1401,7 @@ fn dump_output(config: &Config, testfile: &Path, out: &str, err: &str) {
 fn dump_output_file(config: &Config, testfile: &Path,
                     out: &str, extension: &str) {
     let outfile = make_out_name(config, testfile, extension);
-    File::create(&outfile).write(out.as_bytes()).unwrap();
+    File::create(&outfile).write_all(out.as_bytes()).unwrap();
 }
 
 fn make_out_name(config: &Config, testfile: &Path, extension: &str) -> Path {

Diff for: src/doc/trpl/guessing-game.md

@@ -75,14 +75,14 @@ Let's get to it! The first thing we need to do for our guessing game is
 allow our player to input a guess. Put this in your `src/main.rs`:
 
 ```{rust,no_run}
-use std::io;
+use std::old_io;
 
 fn main() {
     println!("Guess the number!");
 
     println!("Please input your guess.");
 
-    let input = io::stdin().read_line()
+    let input = old_io::stdin().read_line()
                            .ok()
                            .expect("Failed to read line");
 
@@ -121,7 +121,7 @@ explanatory text, and then an example. Let's try to modify our code to add in th
 `random` function and see what happens:
 
 ```{rust,ignore}
-use std::io;
+use std::old_io;
 use std::rand;
 
 fn main() {
@@ -133,7 +133,7 @@ fn main() {
 
     println!("Please input your guess.");
 
-    let input = io::stdin().read_line()
+    let input = old_io::stdin().read_line()
                            .ok()
                            .expect("Failed to read line");
 
@@ -180,7 +180,7 @@ This says "please give me a random `i32` value." We can change our code to use
 this hint:
 
 ```{rust,no_run}
-use std::io;
+use std::old_io;
 use std::rand;
 
 fn main() {
@@ -192,7 +192,7 @@ fn main() {
 
     println!("Please input your guess.");
 
-    let input = io::stdin().read_line()
+    let input = old_io::stdin().read_line()
                            .ok()
                            .expect("Failed to read line");
 
@@ -233,7 +233,7 @@ unsigned integer approach. If we want a random positive number, we should ask fo
 a random positive number. Our code looks like this now:
 
 ```{rust,no_run}
-use std::io;
+use std::old_io;
 use std::rand;
 
 fn main() {
@@ -245,7 +245,7 @@ fn main() {
 
     println!("Please input your guess.");
 
-    let input = io::stdin().read_line()
+    let input = old_io::stdin().read_line()
                            .ok()
                            .expect("Failed to read line");
 
@@ -276,7 +276,7 @@ two numbers. Let's add that in, along with a `match` statement to compare our
 guess to the secret number:
 
 ```{rust,ignore}
-use std::io;
+use std::old_io;
 use std::rand;
 use std::cmp::Ordering;
 
@@ -289,7 +289,7 @@ fn main() {
 
     println!("Please input your guess.");
 
-    let input = io::stdin().read_line()
+    let input = old_io::stdin().read_line()
                            .ok()
                            .expect("Failed to read line");
 
@@ -331,7 +331,7 @@ but we've given it unsigned integers. In this case, the fix is easy, because
 we wrote the `cmp` function! Let's change it to take `u32`s:
 
 ```{rust,ignore}
-use std::io;
+use std::old_io;
 use std::rand;
 use std::cmp::Ordering;
 
@@ -344,7 +344,7 @@ fn main() {
 
     println!("Please input your guess.");
 
-    let input = io::stdin().read_line()
+    let input = old_io::stdin().read_line()
                            .ok()
                            .expect("Failed to read line");
 
@@ -397,7 +397,7 @@ Anyway, we have a `String`, but we need a `u32`. What to do? Well, there's
 a function for that:
 
 ```{rust,ignore}
-let input = io::stdin().read_line()
+let input = old_io::stdin().read_line()
                        .ok()
                        .expect("Failed to read line");
 let input_num: Option<u32> = input.parse();
@@ -429,7 +429,7 @@ let input_num: Option<u32> = "5".parse(); // input_num: Option<u32>
 Anyway, with us now converting our input to a number, our code looks like this:
 
 ```{rust,ignore}
-use std::io;
+use std::old_io;
 use std::rand;
 use std::cmp::Ordering;
 
@@ -442,7 +442,7 @@ fn main() {
 
     println!("Please input your guess.");
 
-    let input = io::stdin().read_line()
+    let input = old_io::stdin().read_line()
                            .ok()
                            .expect("Failed to read line");
     let input_num: Option<u32> = input.parse();
@@ -479,7 +479,7 @@ need to unwrap the Option. If you remember from before, `match` is a great way
 to do that. Try this code:
 
 ```{rust,no_run}
-use std::io;
+use std::old_io;
 use std::rand;
 use std::cmp::Ordering;
 
@@ -492,7 +492,7 @@ fn main() {
 
     println!("Please input your guess.");
 
-    let input = io::stdin().read_line()
+    let input = old_io::stdin().read_line()
                            .ok()
                            .expect("Failed to read line");
     let input_num: Option<u32> = input.parse();
@@ -546,7 +546,7 @@ method we can use defined on them: `trim()`. One small modification, and our
 code looks like this:
 
 ```{rust,no_run}
-use std::io;
+use std::old_io;
 use std::rand;
 use std::cmp::Ordering;
 
@@ -559,7 +559,7 @@ fn main() {
 
     println!("Please input your guess.");
 
-    let input = io::stdin().read_line()
+    let input = old_io::stdin().read_line()
                            .ok()
                            .expect("Failed to read line");
     let input_num: Option<u32> = input.trim().parse();
@@ -620,7 +620,7 @@ As we already discussed, the `loop` keyword gives us an infinite loop.
 Let's add that in:
 
 ```{rust,no_run}
-use std::io;
+use std::old_io;
 use std::rand;
 use std::cmp::Ordering;
 
@@ -635,7 +635,7 @@ fn main() {
 
         println!("Please input your guess.");
 
-        let input = io::stdin().read_line()
+        let input = old_io::stdin().read_line()
                                .ok()
                                .expect("Failed to read line");
         let input_num: Option<u32> = input.trim().parse();
@@ -696,7 +696,7 @@ Ha! `quit` actually quits. As does any other non-number input. Well, this is
 suboptimal to say the least. First, let's actually quit when you win the game:
 
 ```{rust,no_run}
-use std::io;
+use std::old_io;
 use std::rand;
 use std::cmp::Ordering;
 
@@ -711,7 +711,7 @@ fn main() {
 
         println!("Please input your guess.");
 
-        let input = io::stdin().read_line()
+        let input = old_io::stdin().read_line()
                                .ok()
                                .expect("Failed to read line");
         let input_num: Option<u32> = input.trim().parse();
@@ -752,7 +752,7 @@ we don't want to quit, we just want to ignore it. Change that `return` to
 
 
 ```{rust,no_run}
-use std::io;
+use std::old_io;
 use std::rand;
 use std::cmp::Ordering;
 
@@ -767,7 +767,7 @@ fn main() {
 
         println!("Please input your guess.");
 
-        let input = io::stdin().read_line()
+        let input = old_io::stdin().read_line()
                                .ok()
                                .expect("Failed to read line");
         let input_num: Option<u32> = input.trim().parse();
@@ -831,7 +831,7 @@ think of what it is? That's right, we don't want to print out the secret number.
 It was good for testing, but it kind of ruins the game. Here's our final source:
 
 ```{rust,no_run}
-use std::io;
+use std::old_io;
 use std::rand;
 use std::cmp::Ordering;
 
@@ -844,7 +844,7 @@ fn main() {
 
         println!("Please input your guess.");
 
-        let input = io::stdin().read_line()
+        let input = old_io::stdin().read_line()
                                .ok()
                                .expect("Failed to read line");
         let input_num: Option<u32> = input.trim().parse();