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authorRostislav Skudnov2016-11-24 15:04:00 +0100
committerDenys Vlasenko2016-11-24 15:04:00 +0100
commit2e4ef38743c3d4aef109b5cc04429ec1f0e2f6c8 (patch)
tree4224ad31b96cf2b03874083b80da7c4d38995817 /libbb
parentcb810c48c036f50c19b08df7e161cdb0550a2abd (diff)
downloadbusybox-2e4ef38743c3d4aef109b5cc04429ec1f0e2f6c8.zip
busybox-2e4ef38743c3d4aef109b5cc04429ec1f0e2f6c8.tar.gz
lineedit: fix handling of repeating Alt-b, Alt-f, Alt-d, Alt-Backspace
These key combinations should repeat correctly when the keys are pressed and held. Before this change, they do this erratically - many repeats are "eaten" because they are treated as unrecognized ESC seqs: ESC 0x7f is treated by Alt+baskspace, but ESC 0x7f ESC 0x7f ESC 0x7f is unrecognized. Escape sequences corresponding to these key combinations are moved from read_line_input to lineedit_read_key. Also, these key sequences are now enabled regardless of whether FEATURE_EDITING_VI is set, since Vim does not actually support these key combinations, but they are present in readline library. function old new delta static.esccmds 93 103 +10 read_line_input 3737 3687 -50 Signed-off-by: Rostislav Skudnov <rostislav@tuxera.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'libbb')
-rw-r--r--libbb/lineedit.c60
-rw-r--r--libbb/read_key.c12
2 files changed, 30 insertions, 42 deletions
diff --git a/libbb/lineedit.c b/libbb/lineedit.c
index 2cc61db..ac049f5 100644
--- a/libbb/lineedit.c
+++ b/libbb/lineedit.c
@@ -13,7 +13,6 @@
*
* This code is 'as is' with no warranty.
*/
-
/*
* Usage and known bugs:
* Terminal key codes are not extensive, more needs to be added.
@@ -23,9 +22,6 @@
* Ctrl-E also works as End.
*
* The following readline-like commands are not implemented:
- * ESC-b -- Move back one word
- * ESC-f -- Move forward one word
- * ESC-d -- Delete forward one word
* CTL-t -- Transpose two characters
*
* lineedit does not know that the terminal escape sequences do not
@@ -2483,6 +2479,24 @@ int FAST_FUNC read_line_input(line_input_t *st, const char *prompt, char *comman
while (cursor > 0 && !BB_isspace(command_ps[cursor-1]))
input_backspace();
break;
+ case KEYCODE_ALT_D: {
+ /* Delete word forward */
+ int nc, sc = cursor;
+ ctrl_right();
+ nc = cursor - sc;
+ input_backward(nc);
+ while (--nc >= 0)
+ input_delete(1);
+ break;
+ }
+ case KEYCODE_ALT_BACKSPACE: {
+ /* Delete word backward */
+ int sc = cursor;
+ ctrl_left();
+ while (sc-- > cursor)
+ input_delete(1);
+ break;
+ }
#if ENABLE_FEATURE_REVERSE_SEARCH
case CTRL('R'):
ic = ic_raw = reverse_i_search();
@@ -2625,44 +2639,6 @@ int FAST_FUNC read_line_input(line_input_t *st, const char *prompt, char *comman
vi_cmdmode = 1;
input_backward(1);
}
- /* Handle a few ESC-<key> combinations the same way
- * standard readline bindings (IOW: bash) do.
- * Often, Alt-<key> generates ESC-<key>.
- */
- ic = lineedit_read_key(read_key_buffer, 50);
- switch (ic) {
- //case KEYCODE_LEFT: - bash doesn't do this
- case 'b':
- ctrl_left();
- break;
- //case KEYCODE_RIGHT: - bash doesn't do this
- case 'f':
- ctrl_right();
- break;
- //case KEYCODE_DELETE: - bash doesn't do this
- case 'd': /* Alt-D */
- {
- /* Delete word forward */
- int nc, sc = cursor;
- ctrl_right();
- nc = cursor - sc;
- input_backward(nc);
- while (--nc >= 0)
- input_delete(1);
- break;
- }
- case '\b': /* Alt-Backspace(?) */
- case '\x7f': /* Alt-Backspace(?) */
- //case 'w': - bash doesn't do this
- {
- /* Delete word backward */
- int sc = cursor;
- ctrl_left();
- while (sc-- > cursor)
- input_delete(1);
- break;
- }
- }
break;
#endif /* FEATURE_COMMAND_EDITING_VI */
diff --git a/libbb/read_key.c b/libbb/read_key.c
index ace23de..9517868 100644
--- a/libbb/read_key.c
+++ b/libbb/read_key.c
@@ -18,8 +18,20 @@ int64_t FAST_FUNC read_key(int fd, char *buffer, int timeout)
/* Known escape sequences for cursor and function keys.
* See "Xterm Control Sequences"
* http://invisible-island.net/xterm/ctlseqs/ctlseqs.html
+ * Array should be sorted from shortest to longest.
*/
static const char esccmds[] ALIGN1 = {
+ '\x7f' |0x80,KEYCODE_ALT_BACKSPACE,
+ '\b' |0x80,KEYCODE_ALT_BACKSPACE,
+ 'd' |0x80,KEYCODE_ALT_D ,
+ /* lineedit mimics bash: Alt-f and Alt-b are forward/backward
+ * word jumps. We cheat here and make them return ALT_LEFT/RIGHT
+ * keycodes. This way, lineedit need no special code to handle them.
+ * If we'll need to distinguish them, introduce new ALT_F/B keycodes,
+ * and update lineedit to react to them.
+ */
+ 'f' |0x80,KEYCODE_ALT_RIGHT,
+ 'b' |0x80,KEYCODE_ALT_LEFT,
'O','A' |0x80,KEYCODE_UP ,
'O','B' |0x80,KEYCODE_DOWN ,
'O','C' |0x80,KEYCODE_RIGHT ,