extra: Put the nail in the coffin, delete libextra

This commit shreds all remnants of libextra from the compiler and standard
distribution. Two modules, c_vec/tempfile, were moved into libstd after some
cleanup, and the other modules were moved to separate crates as seen fit.

Closes #8784
Closes #12413
Closes #12576

2 files changed, 103 insertions, 19 deletions

diff --git a/src/libstd/io/mod.rs b/src/libstd/io/mod.rs
index 869643336a9..28f6d13070e 100644
--- a/src/libstd/io/mod.rs
+++ b/src/libstd/io/mod.rs
@@ -241,40 +241,31 @@ pub use self::net::tcp::TcpStream;
 pub use self::net::udp::UdpStream;
 pub use self::pipe::PipeStream;
 pub use self::process::{Process, ProcessConfig};
+pub use self::tempfile::TempDir;
 
 pub use self::mem::{MemReader, BufReader, MemWriter, BufWriter};
 pub use self::buffered::{BufferedReader, BufferedWriter, BufferedStream,
                          LineBufferedWriter};
 pub use self::comm_adapters::{ChanReader, ChanWriter};
 
+// this comes first to get the iotest! macro
 pub mod test;
 
+mod buffered;
+mod comm_adapters;
+mod mem;
+mod result;
+mod tempfile;
+pub mod extensions;
 pub mod fs;
-
+pub mod net;
 pub mod pipe;
-
 pub mod process;
-
-pub mod net;
-
-mod mem;
-
+pub mod signal;
 pub mod stdio;
-
-mod result;
-
-pub mod extensions;
-
 pub mod timer;
-
-mod buffered;
-
-pub mod signal;
-
 pub mod util;
 
-mod comm_adapters;
-
 /// The default buffer size for various I/O operations
 // libuv recommends 64k buffers to maximize throughput
 // https://groups.google.com/forum/#!topic/libuv/oQO1HJAIDdA
diff --git a/src/libstd/io/tempfile.rs b/src/libstd/io/tempfile.rs
new file mode 100644
index 00000000000..34d6b19199a
--- /dev/null
+++ b/src/libstd/io/tempfile.rs
@@ -0,0 +1,93 @@
+// Copyright 2013 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.
+
+//! Temporary files and directories
+
+use io::fs;
+use io;
+use iter::{Iterator, range};
+use libc;
+use ops::Drop;
+use option::{Option, None, Some};
+use os;
+use path::{Path, GenericPath};
+use result::{Ok, Err};
+use sync::atomics;
+
+/// A wrapper for a path to temporary directory implementing automatic
+/// scope-based deletion.
+pub struct TempDir {
+    priv path: Option<Path>
+}
+
+impl TempDir {
+    /// Attempts to make a temporary directory inside of `tmpdir` whose name
+    /// will have the suffix `suffix`. The directory will be automatically
+    /// deleted once the returned wrapper is destroyed.
+    ///
+    /// If no directory can be created, None is returned.
+    pub fn new_in(tmpdir: &Path, suffix: &str) -> Option<TempDir> {
+        if !tmpdir.is_absolute() {
+            return TempDir::new_in(&os::make_absolute(tmpdir), suffix);
+        }
+
+        static mut CNT: atomics::AtomicUint = atomics::INIT_ATOMIC_UINT;
+
+        for _ in range(0u, 1000) {
+            let filename = format!("rs-{}-{}-{}",
+                                   unsafe { libc::getpid() },
+                                   unsafe { CNT.fetch_add(1, atomics::SeqCst) },
+                                   suffix);
+            let p = tmpdir.join(filename);
+            match fs::mkdir(&p, io::UserRWX) {
+                Err(..) => {}
+                Ok(()) => return Some(TempDir { path: Some(p) })
+            }
+        }
+        None
+    }
+
+    /// Attempts to make a temporary directory inside of `os::tmpdir()` whose
+    /// name will have the suffix `suffix`. The directory will be automatically
+    /// deleted once the returned wrapper is destroyed.
+    ///
+    /// If no directory can be created, None is returned.
+    pub fn new(suffix: &str) -> Option<TempDir> {
+        TempDir::new_in(&os::tmpdir(), suffix)
+    }
+
+    /// Unwrap the wrapped `std::path::Path` from the `TempDir` wrapper.
+    /// This discards the wrapper so that the automatic deletion of the
+    /// temporary directory is prevented.
+    pub fn unwrap(self) -> Path {
+        let mut tmpdir = self;
+        tmpdir.path.take_unwrap()
+    }
+
+    /// Access the wrapped `std::path::Path` to the temporary directory.
+    pub fn path<'a>(&'a self) -> &'a Path {
+        self.path.get_ref()
+    }
+}
+
+impl Drop for TempDir {
+    fn drop(&mut self) {
+        for path in self.path.iter() {
+            if path.exists() {
+                // FIXME: is failing the right thing to do?
+                fs::rmdir_recursive(path).unwrap();
+            }
+        }
+    }
+}
+
+// the tests for this module need to change the path using change_dir,
+// and this doesn't play nicely with other tests so these unit tests are located
+// in src/test/run-pass/tempfile.rs