From 89e9aafbb55b76a2bb1c5e78ffd7ccc1b8cfda29 Mon Sep 17 00:00:00 2001
From: Andreas Kling <awesomekling@gmail.com>
Date: Thu, 25 Apr 2019 23:05:10 +0200
Subject: [PATCH] sh: Support erasing a whole word with WERASE (^W).

---
 Userland/sh.cpp | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/Userland/sh.cpp b/Userland/sh.cpp
index cf1485552f..cd00a8dd06 100644
--- a/Userland/sh.cpp
+++ b/Userland/sh.cpp
@@ -7,6 +7,7 @@
 #include <unistd.h>
 #include <fcntl.h>
 #include <termios.h>
+#include <ctype.h>
 #include <sys/mman.h>
 #include <sys/stat.h>
 #include <sys/utsname.h>
@@ -573,6 +574,21 @@ int main(int argc, char** argv)
                 fflush(stdout);
                 continue;
             }
+            if (ch == g->termios.c_cc[VWERASE]) {
+                bool has_seen_nonspace = false;
+                while (linedx > 0) {
+                    if (isspace(linebuf[linedx - 1])) {
+                        if (has_seen_nonspace)
+                            break;
+                    } else {
+                        has_seen_nonspace = true;
+                    }
+                    putchar(0x8);
+                    --linedx;
+                }
+                fflush(stdout);
+                continue;
+            }
             if (ch == g->termios.c_cc[VKILL]) {
                 if (linedx == 0)
                     continue;