From: Steve Bennett <steveb@workware.net.au>
Date: Thu, 30 Sep 2010 22:23:28 +0000 (+1000)
Subject: Highlight control characters
X-Git-Url: https://git.lizzy.rs/?a=commitdiff_plain;h=682e08387837e29d923a0f53f473c5863686453f;p=linenoise.git

Highlight control characters

Signed-off-by: Steve Bennett <steveb@workware.net.au>
---

diff --git a/linenoise.c b/linenoise.c
index 0812467..c496841 100644
--- a/linenoise.c
+++ b/linenoise.c
@@ -81,6 +81,14 @@
  *    Sequence: ESC [ 2 J
  *    Effect: clear the whole screen
  * 
+ * For highlighting control characters, we also use:
+ * SO (enter StandOut)
+ *    Sequence: ESC [ 7 m
+ *    Effect: Uses some standout mode such as reverse video
+ *
+ * SE (Standout End)
+ *    Sequence: ESC [ 0 m
+ *    Effect: Exit standout mode
  */
 
 #include <termios.h>
@@ -210,9 +218,8 @@ static void refreshLine(int fd, const char *prompt, char *buf, size_t len, size_
         if (buf[i] < ' ') {
             write(fd, buf + p, i - p);
             p = i + 1;
-            seq[0] = '^';
-            seq[1] = buf[i] + '@';
-            write(fd, seq, 2);
+            snprintf(seq,64,"\033[7m^%c\033[0m", buf[i] + '@');
+            if (write(fd,seq,strlen(seq)) == -1) return;
             if (i < pos) {
                 extra++;
             }