lineedit: add support for M-b, M-f, M-d, M-Backspace

function                                             old     new   delta
ctrl_left                                              -      96     +96
ctrl_right                                             -      76     +76
static.esccmds                                        81      93     +12
read_line_input                                     3876    3885      +9
------------------------------------------------------------------------------
(add/remove: 2/0 grow/shrink: 2/0 up/down: 193/0)             Total: 193 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 29 insertions, 17 deletions

diff --git a/include/libbb.h b/include/libbb.h
index 791cdd94e..53224fa35 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -1358,25 +1358,37 @@ enum {
         KEYCODE_DELETE   =  -9,
         KEYCODE_PAGEUP   = -10,
         KEYCODE_PAGEDOWN = -11,
-
-        KEYCODE_CTRL_UP    = KEYCODE_UP    & ~0x40,
-        KEYCODE_CTRL_DOWN  = KEYCODE_DOWN  & ~0x40,
+        // -12 is reserved for Alt/Ctrl/Shift-TAB
+#if 0
+        KEYCODE_FUN1     = -13,
+        KEYCODE_FUN2     = -14,
+        KEYCODE_FUN3     = -15,
+        KEYCODE_FUN4     = -16,
+        KEYCODE_FUN5     = -17,
+        KEYCODE_FUN6     = -18,
+        KEYCODE_FUN7     = -19,
+        KEYCODE_FUN8     = -20,
+        KEYCODE_FUN9     = -21,
+        KEYCODE_FUN10    = -22,
+        KEYCODE_FUN11    = -23,
+        KEYCODE_FUN12    = -24,
+#endif
+        /* Be sure that last defined value is small enough
+         * to not interfere with Alt/Ctrl/Shift bits.
+         * So far we do not exceed -31 (0xfff..fffe1),
+         * which gives us three upper bits in LSB to play with.
+         */
+        //KEYCODE_SHIFT_TAB  = (-12)         & ~0x80,
+        //KEYCODE_SHIFT_...  = KEYCODE_...   & ~0x80,
+        //KEYCODE_CTRL_UP    = KEYCODE_UP    & ~0x40,
+        //KEYCODE_CTRL_DOWN  = KEYCODE_DOWN  & ~0x40,
         KEYCODE_CTRL_RIGHT = KEYCODE_RIGHT & ~0x40,
         KEYCODE_CTRL_LEFT  = KEYCODE_LEFT  & ~0x40,
-#if 0
-        KEYCODE_FUN1     = -12,
-        KEYCODE_FUN2     = -13,
-        KEYCODE_FUN3     = -14,
-        KEYCODE_FUN4     = -15,
-        KEYCODE_FUN5     = -16,
-        KEYCODE_FUN6     = -17,
-        KEYCODE_FUN7     = -18,
-        KEYCODE_FUN8     = -19,
-        KEYCODE_FUN9     = -20,
-        KEYCODE_FUN10    = -21,
-        KEYCODE_FUN11    = -22,
-        KEYCODE_FUN12    = -23,
-#endif
+        //KEYCODE_ALT_UP     = KEYCODE_UP    & ~0x20,
+        //KEYCODE_ALT_DOWN   = KEYCODE_DOWN  & ~0x20,
+        KEYCODE_ALT_RIGHT  = KEYCODE_RIGHT & ~0x20,
+        KEYCODE_ALT_LEFT   = KEYCODE_LEFT  & ~0x20,
+
         KEYCODE_CURSOR_POS = -0x100, /* 0xfff..fff00 */
         /* How long is the longest ESC sequence we know?
          * We want it big enough to be able to contain