Completely re-work colored output and tty handling.

This commit completely guts all of the color handling code and replaces
most of it with two new crates: wincolor and termcolor. wincolor
provides a simple API to coloring using the Windows console and
termcolor provides a platform independent coloring API tuned for
multithreaded command line programs. This required a lot more
flexibility than what the `term` crate provided, so it was dropped.
We instead switch to writing ANSI escape sequences directly and ignore
the TERMINFO database.

In addition to fixing several bugs, this commit also permits end users
to customize colors to a certain extent. For example, this command will
set the match color to magenta and the line number background to yellow:

    rg --colors 'match:fg:magenta' --colors 'line:bg:yellow' foo

For tty handling, we've adopted a hack from `git` to do tty detection in
MSYS/mintty terminals. As a result, ripgrep should get both color
detection and piping correct on Windows regardless of which terminal you
use.

Finally, switch to line buffering. Performance doesn't seem to be
impacted and it's an otherwise more user friendly option.

Fixes #37, Fixes #51, Fixes #94, Fixes #117, Fixes #182, Fixes #231

1 files changed, 5 insertions, 7 deletions

diff --git a/src/search_buffer.rs b/src/search_buffer.rs
index 16a161e1..1e8cfe8f 100644
--- a/src/search_buffer.rs
+++ b/src/search_buffer.rs
@@ -10,7 +10,7 @@ use std::cmp;
 use std::path::Path;
 
 use grep::Grep;
-use term::Terminal;
+use termcolor::WriteColor;
 
 use printer::Printer;
 use search_stream::{IterLines, Options, count_lines, is_binary};
@@ -26,7 +26,7 @@ pub struct BufferSearcher<'a, W: 'a> {
     last_line: usize,
 }
 
-impl<'a, W: Send + Terminal> BufferSearcher<'a, W> {
+impl<'a, W: WriteColor> BufferSearcher<'a, W> {
     pub fn new(
         printer: &'a mut Printer<W>,
         grep: &'a Grep,
@@ -196,10 +196,9 @@ mod tests {
     use std::path::Path;
 
     use grep::GrepBuilder;
-    use term::{Terminal, TerminfoTerminal};
 
-    use out::ColoredTerminal;
     use printer::Printer;
+    use termcolor;
 
     use super::BufferSearcher;
 
@@ -216,15 +215,14 @@ and exhibited clearly, with a label attached.\
         &Path::new("/baz.rs")
     }
 
-    type TestSearcher<'a> =
-        BufferSearcher<'a, ColoredTerminal<TerminfoTerminal<Vec<u8>>>>;
+    type TestSearcher<'a> = BufferSearcher<'a, termcolor::NoColor<Vec<u8>>>;
 
     fn search<F: FnMut(TestSearcher) -> TestSearcher>(
         pat: &str,
         haystack: &str,
         mut map: F,
     ) -> (u64, String) {
-        let outbuf = ColoredTerminal::NoColor(vec![]);
+        let outbuf = termcolor::NoColor::new(vec![]);
         let mut pp = Printer::new(outbuf).with_filename(true);
         let grep = GrepBuilder::new(pat).build().unwrap();
         let count = {