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https://github.com/topjohnwu/ndk-busybox.git
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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>
This commit is contained in:
Rostislav Skudnov
Denys Vlasenko
parent
cb810c48c0
commit
2e4ef38743
@ -1463,46 +1463,46 @@ unsigned long long bb_makedev(unsigned major, unsigned minor) FAST_FUNC;
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* yet doesn't represent any valid Unicode character.
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* Also, -1 is reserved for error indication and we don't use it. */
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enum {
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KEYCODE_UP = -2,
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KEYCODE_DOWN = -3,
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KEYCODE_RIGHT = -4,
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KEYCODE_LEFT = -5,
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KEYCODE_HOME = -6,
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KEYCODE_END = -7,
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KEYCODE_INSERT = -8,
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KEYCODE_DELETE = -9,
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KEYCODE_PAGEUP = -10,
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KEYCODE_PAGEDOWN = -11,
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// -12 is reserved for Alt/Ctrl/Shift-TAB
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KEYCODE_UP = -2,
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KEYCODE_DOWN = -3,
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KEYCODE_RIGHT = -4,
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KEYCODE_LEFT = -5,
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KEYCODE_HOME = -6,
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KEYCODE_END = -7,
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KEYCODE_INSERT = -8,
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KEYCODE_DELETE = -9,
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KEYCODE_PAGEUP = -10,
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KEYCODE_PAGEDOWN = -11,
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KEYCODE_BACKSPACE = -12, /* Used only if Alt/Ctrl/Shifted */
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KEYCODE_D = -13, /* Used only if Alted */
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#if 0
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KEYCODE_FUN1 = -13,
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KEYCODE_FUN2 = -14,
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KEYCODE_FUN3 = -15,
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KEYCODE_FUN4 = -16,
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KEYCODE_FUN5 = -17,
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KEYCODE_FUN6 = -18,
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KEYCODE_FUN7 = -19,
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KEYCODE_FUN8 = -20,
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KEYCODE_FUN9 = -21,
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KEYCODE_FUN10 = -22,
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KEYCODE_FUN11 = -23,
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KEYCODE_FUN12 = -24,
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KEYCODE_FUN1 = ,
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KEYCODE_FUN2 = ,
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KEYCODE_FUN3 = ,
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KEYCODE_FUN4 = ,
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KEYCODE_FUN5 = ,
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KEYCODE_FUN6 = ,
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KEYCODE_FUN7 = ,
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KEYCODE_FUN8 = ,
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KEYCODE_FUN9 = ,
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KEYCODE_FUN10 = ,
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KEYCODE_FUN11 = ,
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KEYCODE_FUN12 = ,
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#endif
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/* Be sure that last defined value is small enough
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* to not interfere with Alt/Ctrl/Shift bits.
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* So far we do not exceed -31 (0xfff..fffe1),
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* which gives us three upper bits in LSB to play with.
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/* ^^^^^ Be sure that last defined value is small enough.
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* Current read_key() code allows going up to -32 (0xfff..fffe0).
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* This gives three upper bits in LSB to play with:
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* KEYCODE_foo values are 0xfff..fffXX, lowest XX bits are: scavvvvv,
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* s=0 if SHIFT, c=0 if CTRL, a=0 if ALT,
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* vvvvv bits are the same for same key regardless of "shift bits".
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*/
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//KEYCODE_SHIFT_TAB = (-12) & ~0x80,
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//KEYCODE_SHIFT_... = KEYCODE_... & ~0x80,
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//KEYCODE_CTRL_UP = KEYCODE_UP & ~0x40,
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//KEYCODE_CTRL_DOWN = KEYCODE_DOWN & ~0x40,
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KEYCODE_CTRL_RIGHT = KEYCODE_RIGHT & ~0x40,
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KEYCODE_CTRL_LEFT = KEYCODE_LEFT & ~0x40,
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//KEYCODE_ALT_UP = KEYCODE_UP & ~0x20,
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//KEYCODE_ALT_DOWN = KEYCODE_DOWN & ~0x20,
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KEYCODE_ALT_RIGHT = KEYCODE_RIGHT & ~0x20,
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KEYCODE_ALT_LEFT = KEYCODE_LEFT & ~0x20,
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//KEYCODE_SHIFT_... = KEYCODE_... & ~0x80,
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KEYCODE_CTRL_RIGHT = KEYCODE_RIGHT & ~0x40,
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KEYCODE_CTRL_LEFT = KEYCODE_LEFT & ~0x40,
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KEYCODE_ALT_RIGHT = KEYCODE_RIGHT & ~0x20,
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KEYCODE_ALT_LEFT = KEYCODE_LEFT & ~0x20,
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KEYCODE_ALT_BACKSPACE = KEYCODE_BACKSPACE & ~0x20,
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KEYCODE_ALT_D = KEYCODE_D & ~0x20,
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KEYCODE_CURSOR_POS = -0x100, /* 0xfff..fff00 */
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/* How long is the longest ESC sequence we know?
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@ -13,7 +13,6 @@
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*
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* This code is 'as is' with no warranty.
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*/
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/*
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* Usage and known bugs:
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* Terminal key codes are not extensive, more needs to be added.
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@ -23,9 +22,6 @@
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* Ctrl-E also works as End.
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*
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* The following readline-like commands are not implemented:
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* ESC-b -- Move back one word
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* ESC-f -- Move forward one word
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* ESC-d -- Delete forward one word
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* CTL-t -- Transpose two characters
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*
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* lineedit does not know that the terminal escape sequences do not
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@ -2483,6 +2479,24 @@ int FAST_FUNC read_line_input(line_input_t *st, const char *prompt, char *comman
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while (cursor > 0 && !BB_isspace(command_ps[cursor-1]))
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input_backspace();
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break;
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case KEYCODE_ALT_D: {
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/* Delete word forward */
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int nc, sc = cursor;
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ctrl_right();
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nc = cursor - sc;
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input_backward(nc);
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while (--nc >= 0)
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input_delete(1);
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break;
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}
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case KEYCODE_ALT_BACKSPACE: {
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/* Delete word backward */
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int sc = cursor;
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ctrl_left();
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while (sc-- > cursor)
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input_delete(1);
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break;
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}
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#if ENABLE_FEATURE_REVERSE_SEARCH
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case CTRL('R'):
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ic = ic_raw = reverse_i_search();
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@ -2625,44 +2639,6 @@ int FAST_FUNC read_line_input(line_input_t *st, const char *prompt, char *comman
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vi_cmdmode = 1;
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input_backward(1);
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}
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/* Handle a few ESC-<key> combinations the same way
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* standard readline bindings (IOW: bash) do.
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* Often, Alt-<key> generates ESC-<key>.
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*/
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ic = lineedit_read_key(read_key_buffer, 50);
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switch (ic) {
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//case KEYCODE_LEFT: - bash doesn't do this
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case 'b':
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ctrl_left();
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break;
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//case KEYCODE_RIGHT: - bash doesn't do this
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case 'f':
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ctrl_right();
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break;
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//case KEYCODE_DELETE: - bash doesn't do this
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case 'd': /* Alt-D */
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{
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/* Delete word forward */
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int nc, sc = cursor;
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ctrl_right();
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nc = cursor - sc;
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input_backward(nc);
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while (--nc >= 0)
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input_delete(1);
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break;
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}
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case '\b': /* Alt-Backspace(?) */
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case '\x7f': /* Alt-Backspace(?) */
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//case 'w': - bash doesn't do this
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{
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/* Delete word backward */
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int sc = cursor;
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ctrl_left();
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while (sc-- > cursor)
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input_delete(1);
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break;
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}
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}
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break;
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#endif /* FEATURE_COMMAND_EDITING_VI */
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@ -18,8 +18,20 @@ int64_t FAST_FUNC read_key(int fd, char *buffer, int timeout)
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/* Known escape sequences for cursor and function keys.
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* See "Xterm Control Sequences"
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* http://invisible-island.net/xterm/ctlseqs/ctlseqs.html
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* Array should be sorted from shortest to longest.
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*/
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static const char esccmds[] ALIGN1 = {
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'\x7f' |0x80,KEYCODE_ALT_BACKSPACE,
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'\b' |0x80,KEYCODE_ALT_BACKSPACE,
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'd' |0x80,KEYCODE_ALT_D ,
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/* lineedit mimics bash: Alt-f and Alt-b are forward/backward
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* word jumps. We cheat here and make them return ALT_LEFT/RIGHT
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* keycodes. This way, lineedit need no special code to handle them.
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* If we'll need to distinguish them, introduce new ALT_F/B keycodes,
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* and update lineedit to react to them.
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*/
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'f' |0x80,KEYCODE_ALT_RIGHT,
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'b' |0x80,KEYCODE_ALT_LEFT,
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'O','A' |0x80,KEYCODE_UP ,
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'O','B' |0x80,KEYCODE_DOWN ,
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'O','C' |0x80,KEYCODE_RIGHT ,
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