From 43425158f4fbb961d5c365d39664912a7ebf9342 Mon Sep 17 00:00:00 2001
From: Junegunn Choi <junegunn.c@gmail.com>
Date: Wed, 23 Nov 2016 02:18:18 +0900
Subject: Make escape delay configurable via ncurses standard $ESCDELAY

Also reduce the default delay to 50ms. We should not set it to 0ms as it
breaks escape sequences on WSL. If 50ms is not enough, one can increase
the delay by setting $ESCDELAY to a larger value.
---
 src/tui/ncurses.go | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

(limited to 'src/tui')

diff --git a/src/tui/ncurses.go b/src/tui/ncurses.go
index 5a4d5382..8603fd32 100644
--- a/src/tui/ncurses.go
+++ b/src/tui/ncurses.go
@@ -23,6 +23,7 @@ import "C"
 import (
 	"fmt"
 	"os"
+	"strconv"
 	"strings"
 	"time"
 	"unicode/utf8"
@@ -103,8 +104,16 @@ func Init(theme *ColorTheme, black bool, mouse bool) {
 	C.raw() // stty dsusp undef
 	C.nonl()
 	C.keypad(C.stdscr, true)
-	C.set_escdelay(100)
-	C.timeout(100) // ESCDELAY 100ms + timeout 100ms
+
+	delay := 50
+	delayEnv := os.Getenv("ESCDELAY")
+	if len(delayEnv) > 0 {
+		num, err := strconv.Atoi(delayEnv)
+		if err == nil && num >= 0 {
+			delay = num
+		}
+	}
+	C.set_escdelay(C.int(delay))
 
 	_color = theme != nil
 	if _color {
@@ -293,8 +302,10 @@ func consume(expects ...rune) bool {
 }
 
 func escSequence() Event {
-	// nodelay is not thread-safe (e.g. <ESC><CTRL-P>)
-	// C.nodelay(C.stdscr, true)
+	C.nodelay(C.stdscr, true)
+	defer func() {
+		C.nodelay(C.stdscr, false)
+	}()
 	c := C.getch()
 	switch c {
 	case C.ERR:
-- 
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