X-Git-Url: https://git.saurik.com/redis.git/blobdiff_plain/ff4058183bc6dfdc130a7172105bb0a02f76b4ec..4eddb121563a9e50cf2ee66e2a0ff7c186dd696a:/deps/linenoise/linenoise.c

diff --git a/deps/linenoise/linenoise.c b/deps/linenoise/linenoise.c
index 0ebef2e9..18a15cc4 100644
--- a/deps/linenoise/linenoise.c
+++ b/deps/linenoise/linenoise.c
@@ -9,6 +9,8 @@
  * the 2010 UNIX computers around.
  *
  * Copyright (c) 2010, Salvatore Sanfilippo <antirez at gmail dot com>
+ * Copyright (c) 2010, Pieter Noordhuis <pcnoordhuis at gmail dot com>
+ *
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -66,6 +68,17 @@
  * CUF (CUrsor Forward)
  *    Sequence: ESC [ n C
  *    Effect: moves cursor forward of n chars
+ *
+ * The following are used to clear the screen: ESC [ H ESC [ 2 J
+ * This is actually composed of two sequences:
+ *
+ * cursorhome
+ *    Sequence: ESC [ H
+ *    Effect: moves the cursor to upper left corner
+ *
+ * ED2 (Clear entire screen)
+ *    Sequence: ESC [ 2 J
+ *    Effect: clear the whole screen
  * 
  */
 
@@ -243,10 +256,14 @@ static int completeLine(int fd, const char *prompt, char *buf, size_t buflen, si
                     if (i == lc.len) beep();
                     break;
                 case 27: /* escape */
+                    /* Re-show original buffer */
+                    if (i < lc.len) {
+                        refreshLine(fd,prompt,buf,*len,*pos,cols);
+                    }
                     stop = 1;
                     break;
                 default:
-                    /* update buffer and return */
+                    /* Update buffer and return */
                     if (i < lc.len) {
                         nwritten = snprintf(buf,buflen,"%s",lc.cvec[i]);
                         *len = *pos = nwritten;
@@ -261,6 +278,12 @@ static int completeLine(int fd, const char *prompt, char *buf, size_t buflen, si
     return c; /* Return last read character */
 }
 
+void linenoiseClearScreen(void) {
+    if (write(STDIN_FILENO,"\x1b[H\x1b[2J",7) <= 0) {
+        /* nothing to do, just to avoid warning. */
+    }
+}
+
 static int linenoisePrompt(int fd, char *buf, size_t buflen, const char *prompt) {
     size_t plen = strlen(prompt);
     size_t pos = 0;
@@ -297,10 +320,9 @@ static int linenoisePrompt(int fd, char *buf, size_t buflen, const char *prompt)
 
         switch(c) {
         case 13:    /* enter */
-        case 4:     /* ctrl-d */
             history_len--;
             free(history[history_len]);
-            return (len == 0 && c == 4) ? -1 : (int)len;
+            return (int)len;
         case 3:     /* ctrl-c */
             errno = EAGAIN;
             return -1;
@@ -314,6 +336,18 @@ static int linenoisePrompt(int fd, char *buf, size_t buflen, const char *prompt)
                 refreshLine(fd,prompt,buf,len,pos,cols);
             }
             break;
+        case 4:     /* ctrl-d, remove char at right of cursor */
+            if (len > 1 && pos < (len-1)) {
+                memmove(buf+pos,buf+pos+1,len-pos);
+                len--;
+                buf[len] = '\0';
+                refreshLine(fd,prompt,buf,len,pos,cols);
+            } else if (len == 0) {
+                history_len--;
+                free(history[history_len]);
+                return -1;
+            }
+            break;
         case 20:    /* ctrl-t */
             if (pos > 0 && pos < len) {
                 int aux = buf[pos-1];
@@ -428,6 +462,9 @@ up_down_arrow:
             pos = len;
             refreshLine(fd,prompt,buf,len,pos,cols);
             break;
+        case 12: /* ctrl+l, clear screen */
+            linenoiseClearScreen();
+            refreshLine(fd,prompt,buf,len,pos,cols);
         }
     }
     return len;