linenoise: Ctrl-U deletes only to the left.

Ctrl-U does not traditionally delete the entire line
in line editors or text editors. Rather, it is a
"super backspace" to the beginning of the line.

* linenoise/linenoise.c (edit_delete_prev_all): New
static function.
(edit): Replace CTRL_U action with call to
edit_delete_prev_all.

1 files changed, 11 insertions, 4 deletions

diff --git a/linenoise/linenoise.c b/linenoise/linenoise.c
index 0fcd89fb..273e7645 100644
--- a/linenoise/linenoise.c
+++ b/linenoise/linenoise.c
@@ -687,6 +687,15 @@ static void edit_backspace(lino_t *l) {
     }
 }
 
+/* Delete all characters to left of cursor. */
+static void edit_delete_prev_all(lino_t *l)
+{
+    memmove(l->data, l->data + l->dpos, l->dlen - l->dpos + 1);
+    l->dlen -= l->dpos;
+    l->dpos = 0;
+    refresh_line(l);
+}
+
 /* Delete the previosu word, maintaining the cursor at the start of the
  * current word. */
 static void edit_delete_prev_word(lino_t *l) {
@@ -877,10 +886,8 @@ static int edit(lino_t *l, const char *prompt)
                 return -1;
             }
             break;
-        case CTRL_U: /* delete the whole line. */
-            l->data[0] = '\0';
-            l->dpos = l->dlen = 0;
-            refresh_line(l);
+        case CTRL_U:
+            edit_delete_prev_all(l);
             break;
         case CTRL_V: /* insert next char verbatim */
             verbatim = 1;