Enable ANSI support for Windows 10 Console

On Windows 10, console applications must activate ANSI support in order for colors to be supported.

src/run.rs

@@ -2,10 +2,13 @@ use common::*;
 
 use std::{convert, ffi, cmp};
 use clap::{App, Arg, ArgGroup, AppSettings};
-use misc::maybe_s;
 use configuration::DEFAULT_SHELL;
+use misc::maybe_s;
 use unicode_width::UnicodeWidthStr;
 
+#[cfg(windows)]
+use ansi_term::enable_ansi_support;
+
 macro_rules! die {
   ($($arg:tt)*) => {{
     extern crate std;
@@ -132,6 +135,11 @@ pub fn run() {
     other    => die!("Invalid argument `{}` to --color. This is a bug in just.", other),
   };
 
+  if color.active() {
+    #[cfg(windows)]
+    enable_ansi_support().ok();
+  }
+
   let set_count = matches.occurrences_of("SET");
   let mut overrides = Map::new();
   if set_count > 0 {