Improvements to ANSI emulation in conemu

Signed-off-by: John Howard <jhoward@microsoft.com>

pkg/term/term_windows.go

@@ -40,8 +40,8 @@ var usingNativeConsole bool
 func StdStreams() (stdIn io.ReadCloser, stdOut, stdErr io.Writer) {
 	switch {
 	case os.Getenv("ConEmuANSI") == "ON":
-		// The ConEmu shell emulates ANSI well by default.
+		// The ConEmu terminal emulates ANSI on output streams well.
-		return os.Stdin, os.Stdout, os.Stderr
+		return windows.ConEmuStreams()
 	case os.Getenv("MSYSTEM") != "":
 		// MSYS (mingw) does not emulate ANSI well.
 		return windows.ConsoleStreams()

pkg/term/windows/console.go

@@ -8,8 +8,44 @@ import (
 	"syscall"
 
 	"github.com/Azure/go-ansiterm/winterm"
+
+	ansiterm "github.com/Azure/go-ansiterm"
+	"github.com/Sirupsen/logrus"
+	"io/ioutil"
 )
 
+// ConEmuStreams returns prepared versions of console streams,
+// for proper use in ConEmu terminal.
+// The ConEmu terminal emulates ANSI on output streams well by default.
+func ConEmuStreams() (stdIn io.ReadCloser, stdOut, stdErr io.Writer) {
+	if IsConsole(os.Stdin.Fd()) {
+		stdIn = newAnsiReader(syscall.STD_INPUT_HANDLE)
+	} else {
+		stdIn = os.Stdin
+	}
+
+	stdOut = os.Stdout
+	stdErr = os.Stderr
+
+	// WARNING (BEGIN): sourced from newAnsiWriter
+
+	logFile := ioutil.Discard
+
+	if isDebugEnv := os.Getenv(ansiterm.LogEnv); isDebugEnv == "1" {
+		logFile, _ = os.Create("ansiReaderWriter.log")
+	}
+
+	logger = &logrus.Logger{
+		Out:       logFile,
+		Formatter: new(logrus.TextFormatter),
+		Level:     logrus.DebugLevel,
+	}
+
+	// WARNING (END): sourced from newAnsiWriter
+
+	return stdIn, stdOut, stdErr
+}
+
 // ConsoleStreams returns a wrapped version for each standard stream referencing a console,
 // that handles ANSI character sequences.
 func ConsoleStreams() (stdIn io.ReadCloser, stdOut, stdErr io.Writer) {