From: Rostislav Skudnov Date: Thu, 24 Nov 2016 14:04:00 +0000 (+0100) Subject: lineedit: fix handling of repeating Alt-b, Alt-f, Alt-d, Alt-Backspace X-Git-Tag: 1_26_0~35 X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=2e4ef38743c3d4aef109b5cc04429ec1f0e2f6c8;p=oweals%2Fbusybox.git 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 Signed-off-by: Denys Vlasenko --- diff --git a/include/libbb.h b/include/libbb.h index 20fc7329f..bdafcf5a6 100644 --- a/include/libbb.h +++ b/include/libbb.h @@ -1463,46 +1463,46 @@ unsigned long long bb_makedev(unsigned major, unsigned minor) FAST_FUNC; * yet doesn't represent any valid Unicode character. * Also, -1 is reserved for error indication and we don't use it. */ enum { - KEYCODE_UP = -2, - KEYCODE_DOWN = -3, - KEYCODE_RIGHT = -4, - KEYCODE_LEFT = -5, - KEYCODE_HOME = -6, - KEYCODE_END = -7, - KEYCODE_INSERT = -8, - KEYCODE_DELETE = -9, - KEYCODE_PAGEUP = -10, - KEYCODE_PAGEDOWN = -11, - // -12 is reserved for Alt/Ctrl/Shift-TAB + KEYCODE_UP = -2, + KEYCODE_DOWN = -3, + KEYCODE_RIGHT = -4, + KEYCODE_LEFT = -5, + KEYCODE_HOME = -6, + KEYCODE_END = -7, + KEYCODE_INSERT = -8, + KEYCODE_DELETE = -9, + KEYCODE_PAGEUP = -10, + KEYCODE_PAGEDOWN = -11, + KEYCODE_BACKSPACE = -12, /* Used only if Alt/Ctrl/Shifted */ + KEYCODE_D = -13, /* Used only if Alted */ #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_FUN1 = , + KEYCODE_FUN2 = , + KEYCODE_FUN3 = , + KEYCODE_FUN4 = , + KEYCODE_FUN5 = , + KEYCODE_FUN6 = , + KEYCODE_FUN7 = , + KEYCODE_FUN8 = , + KEYCODE_FUN9 = , + KEYCODE_FUN10 = , + KEYCODE_FUN11 = , + KEYCODE_FUN12 = , +#endif + /* ^^^^^ Be sure that last defined value is small enough. + * Current read_key() code allows going up to -32 (0xfff..fffe0). + * This gives three upper bits in LSB to play with: + * KEYCODE_foo values are 0xfff..fffXX, lowest XX bits are: scavvvvv, + * s=0 if SHIFT, c=0 if CTRL, a=0 if ALT, + * vvvvv bits are the same for same key regardless of "shift bits". */ - //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, - //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_SHIFT_... = KEYCODE_... & ~0x80, + KEYCODE_CTRL_RIGHT = KEYCODE_RIGHT & ~0x40, + KEYCODE_CTRL_LEFT = KEYCODE_LEFT & ~0x40, + KEYCODE_ALT_RIGHT = KEYCODE_RIGHT & ~0x20, + KEYCODE_ALT_LEFT = KEYCODE_LEFT & ~0x20, + KEYCODE_ALT_BACKSPACE = KEYCODE_BACKSPACE & ~0x20, + KEYCODE_ALT_D = KEYCODE_D & ~0x20, KEYCODE_CURSOR_POS = -0x100, /* 0xfff..fff00 */ /* How long is the longest ESC sequence we know? diff --git a/libbb/lineedit.c b/libbb/lineedit.c index 2cc61db40..ac049f57d 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- combinations the same way - * standard readline bindings (IOW: bash) do. - * Often, Alt- generates ESC-. - */ - 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 ace23defb..951786869 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 ,