1 /* linenoise.c -- guerrilla line editing library against the idea that a
2 * line editing lib needs to be 20,000 lines of C code.
4 * You can find the latest source code at:
6 * http://github.com/msteveb/linenoise
7 * (forked from http://github.com/antirez/linenoise)
9 * Does a number of crazy assumptions that happen to be true in 99.9999% of
10 * the 2010 UNIX computers around.
12 * ------------------------------------------------------------------------
14 * Copyright (c) 2010, Salvatore Sanfilippo <antirez at gmail dot com>
15 * Copyright (c) 2010, Pieter Noordhuis <pcnoordhuis at gmail dot com>
16 * Copyright (c) 2011, Steve Bennett <steveb at workware dot net dot au>
18 * All rights reserved.
20 * Redistribution and use in source and binary forms, with or without
21 * modification, are permitted provided that the following conditions are
24 * * Redistributions of source code must retain the above copyright
25 * notice, this list of conditions and the following disclaimer.
27 * * Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
34 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
35 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
36 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
37 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
38 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
39 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
40 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
41 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
43 * ------------------------------------------------------------------------
46 * - http://invisible-island.net/xterm/ctlseqs/ctlseqs.html
47 * - http://www.3waylabs.com/nw/WWW/products/wizcon/vt220.html
54 * List of escape sequences used by this program, we do everything just
55 * a few sequences. In order to be so cheap we may have some
56 * flickering effect with some slow terminal, but the lesser sequences
57 * the more compatible.
61 * Effect: if n is 0 or missing, clear from cursor to end of line
62 * Effect: if n is 1, clear from beginning of line to cursor
63 * Effect: if n is 2, clear entire line
65 * CUF (CUrsor Forward)
67 * Effect: moves cursor forward of n chars
69 * CR (Carriage Return)
71 * Effect: moves cursor to column 1
73 * The following are used to clear the screen: ESC [ H ESC [ 2 J
74 * This is actually composed of two sequences:
78 * Effect: moves the cursor to upper left corner
80 * ED2 (Clear entire screen)
82 * Effect: clear the whole screen
84 * == For highlighting control characters, we also use the following two ==
87 * Effect: Uses some standout mode such as reverse video
91 * Effect: Exit standout mode
93 * == Only used if TIOCGWINSZ fails ==
94 * DSR/CPR (Report cursor position)
96 * Effect: reports current cursor position as ESC [ NNN ; MMM R
100 * If __MINGW32__ is defined, the win32 console API is used.
101 * This could probably be made to work for the msvc compiler too.
102 * This support based in part on work by Jon Griffiths.
105 #ifdef _WIN32 /* Windows platform, either MinGW or Visual Studio (MSVC) */
108 #define USE_WINCONSOLE
110 #define HAVE_UNISTD_H
112 /* Microsoft headers don't like old POSIX names */
113 #define strdup _strdup
114 #define snprintf _snprintf
118 #include <sys/ioctl.h>
119 #include <sys/poll.h>
121 #define HAVE_UNISTD_H
133 #include <sys/types.h>
135 #include "linenoise.h"
138 #define LINENOISE_DEFAULT_HISTORY_MAX_LEN 100
139 #define LINENOISE_MAX_LINE 4096
141 #define ctrl(C) ((C) - '@')
143 /* Use -ve numbers here to co-exist with normal unicode chars */
150 SPECIAL_DELETE = -24,
153 SPECIAL_INSERT = -27,
154 SPECIAL_PAGE_UP = -28,
155 SPECIAL_PAGE_DOWN = -29
158 static int history_max_len = LINENOISE_DEFAULT_HISTORY_MAX_LEN;
159 static int history_len = 0;
160 static char **history = NULL;
162 /* Structure to contain the status of the current (being edited) line */
164 char *buf; /* Current buffer. Always null terminated */
165 int bufmax; /* Size of the buffer, including space for the null termination */
166 int len; /* Number of bytes in 'buf' */
167 int chars; /* Number of chars in 'buf' (utf-8 chars) */
168 int pos; /* Cursor position, measured in chars */
169 int cols; /* Size of the window, in chars */
171 #if defined(USE_TERMIOS)
172 int fd; /* Terminal fd */
173 #elif defined(USE_WINCONSOLE)
174 HANDLE outh; /* Console output handle */
175 HANDLE inh; /* Console input handle */
176 int rows; /* Screen rows */
177 int x; /* Current column during output */
178 int y; /* Current row */
182 static int fd_read(struct current *current);
183 static int getWindowSize(struct current *current);
185 void linenoiseHistoryFree(void) {
189 for (j = 0; j < history_len; j++)
197 #if defined(USE_TERMIOS)
198 static void linenoiseAtExit(void);
199 static struct termios orig_termios; /* in order to restore at exit */
200 static int rawmode = 0; /* for atexit() function to check if restore is needed*/
201 static int atexit_registered = 0; /* register atexit just 1 time */
203 static const char *unsupported_term[] = {"dumb","cons25",NULL};
205 static int isUnsupportedTerm(void) {
206 char *term = getenv("TERM");
210 for (j = 0; unsupported_term[j]; j++) {
211 if (strcasecmp(term, unsupported_term[j]) == 0) {
219 static int enableRawMode(struct current *current) {
222 current->fd = STDIN_FILENO;
224 if (!isatty(current->fd) || isUnsupportedTerm() ||
225 tcgetattr(current->fd, &orig_termios) == -1) {
231 if (!atexit_registered) {
232 atexit(linenoiseAtExit);
233 atexit_registered = 1;
236 raw = orig_termios; /* modify the original mode */
237 /* input modes: no break, no CR to NL, no parity check, no strip char,
238 * no start/stop output control. */
239 raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
240 /* output modes - disable post processing */
241 raw.c_oflag &= ~(OPOST);
242 /* control modes - set 8 bit chars */
243 raw.c_cflag |= (CS8);
244 /* local modes - choing off, canonical off, no extended functions,
245 * no signal chars (^Z,^C) */
246 raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
247 /* control chars - set return condition: min number of bytes and timer.
248 * We want read to return every single byte, without timeout. */
249 raw.c_cc[VMIN] = 1; raw.c_cc[VTIME] = 0; /* 1 byte, no timer */
251 /* put terminal in raw mode after flushing */
252 if (tcsetattr(current->fd,TCSADRAIN,&raw) < 0) {
261 static void disableRawMode(struct current *current) {
262 /* Don't even check the return value as it's too late. */
263 if (rawmode && tcsetattr(current->fd,TCSADRAIN,&orig_termios) != -1)
267 /* At exit we'll try to fix the terminal to the initial conditions. */
268 static void linenoiseAtExit(void) {
270 tcsetattr(STDIN_FILENO, TCSADRAIN, &orig_termios);
272 linenoiseHistoryFree();
275 /* gcc/glibc insists that we care about the return code of write!
276 * Clarification: This means that a void-cast like "(void) (EXPR)"
279 #define IGNORE_RC(EXPR) if (EXPR) {}
281 /* This is fdprintf() on some systems, but use a different
282 * name to avoid conflicts
284 static void fd_printf(int fd, const char *format, ...)
290 va_start(args, format);
291 n = vsnprintf(buf, sizeof(buf), format, args);
293 IGNORE_RC(write(fd, buf, n));
296 static void clearScreen(struct current *current)
298 fd_printf(current->fd, "\x1b[H\x1b[2J");
301 static void cursorToLeft(struct current *current)
303 fd_printf(current->fd, "\r");
306 static int outputChars(struct current *current, const char *buf, int len)
308 return write(current->fd, buf, len);
311 static void outputControlChar(struct current *current, char ch)
313 fd_printf(current->fd, "\x1b[7m^%c\x1b[0m", ch);
316 static void eraseEol(struct current *current)
318 fd_printf(current->fd, "\x1b[0K");
321 static void setCursorPos(struct current *current, int x)
323 fd_printf(current->fd, "\r\x1b[%dC", x);
327 * Reads a char from 'fd', waiting at most 'timeout' milliseconds.
329 * A timeout of -1 means to wait forever.
331 * Returns -1 if no char is received within the time or an error occurs.
333 static int fd_read_char(int fd, int timeout)
341 if (poll(&p, 1, timeout) == 0) {
345 if (read(fd, &c, 1) != 1) {
352 * Reads a complete utf-8 character
353 * and returns the unicode value, or -1 on error.
355 static int fd_read(struct current *current)
363 if (read(current->fd, &buf[0], 1) != 1) {
366 n = utf8_charlen(buf[0]);
367 if (n < 1 || n > 3) {
370 for (i = 1; i < n; i++) {
371 if (read(current->fd, &buf[i], 1) != 1) {
376 /* decode and return the character */
377 utf8_tounicode(buf, &c);
380 return fd_read_char(current->fd, -1);
384 static int getWindowSize(struct current *current)
388 if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == 0 && ws.ws_col != 0) {
389 current->cols = ws.ws_col;
393 /* Failed to query the window size. Perhaps we are on a serial terminal.
394 * Try to query the width by sending the cursor as far to the right
395 * and reading back the cursor position.
396 * Note that this is only done once per call to linenoise rather than
397 * every time the line is refreshed for efficiency reasons.
399 if (current->cols == 0) {
402 /* Move cursor far right and report cursor position, then back to the left */
403 fd_printf(current->fd, "\x1b[999C" "\x1b[6n");
405 /* Parse the response: ESC [ rows ; cols R */
406 if (fd_read_char(current->fd, 100) == 0x1b && fd_read_char(current->fd, 100) == '[') {
409 int ch = fd_read_char(current->fd, 100);
414 else if (ch == 'R') {
416 if (n != 0 && n < 1000) {
421 else if (ch >= 0 && ch <= '9') {
422 n = n * 10 + ch - '0';
434 * If escape (27) was received, reads subsequent
435 * chars to determine if this is a known special key.
437 * Returns SPECIAL_NONE if unrecognised, or -1 if EOF.
439 * If no additional char is received within a short time,
442 static int check_special(int fd)
444 int c = fd_read_char(fd, 50);
451 c2 = fd_read_char(fd, 50);
455 if (c == '[' || c == 'O') {
456 /* Potential arrow key */
463 return SPECIAL_RIGHT;
472 if (c == '[' && c2 >= '1' && c2 <= '8') {
473 /* extended escape */
474 c = fd_read_char(fd, 50);
478 return SPECIAL_INSERT;
480 return SPECIAL_DELETE;
482 return SPECIAL_PAGE_UP;
484 return SPECIAL_PAGE_DOWN;
491 while (c != -1 && c != '~') {
492 /* .e.g \e[12~ or '\e[11;2~ discard the complete sequence */
493 c = fd_read_char(fd, 50);
499 #elif defined(USE_WINCONSOLE)
501 static DWORD orig_consolemode = 0;
503 static int enableRawMode(struct current *current) {
507 current->outh = GetStdHandle(STD_OUTPUT_HANDLE);
508 current->inh = GetStdHandle(STD_INPUT_HANDLE);
510 if (!PeekConsoleInput(current->inh, &irec, 1, &n)) {
513 if (getWindowSize(current) != 0) {
516 if (GetConsoleMode(current->inh, &orig_consolemode)) {
517 SetConsoleMode(current->inh, ENABLE_PROCESSED_INPUT);
522 static void disableRawMode(struct current *current)
524 SetConsoleMode(current->inh, orig_consolemode);
527 static void clearScreen(struct current *current)
529 COORD topleft = { 0, 0 };
532 FillConsoleOutputCharacter(current->outh, ' ',
533 current->cols * current->rows, topleft, &n);
534 FillConsoleOutputAttribute(current->outh,
535 FOREGROUND_RED | FOREGROUND_BLUE | FOREGROUND_GREEN,
536 current->cols * current->rows, topleft, &n);
537 SetConsoleCursorPosition(current->outh, topleft);
540 static void cursorToLeft(struct current *current)
542 COORD pos = { 0, (SHORT)current->y };
545 FillConsoleOutputAttribute(current->outh,
546 FOREGROUND_RED | FOREGROUND_BLUE | FOREGROUND_GREEN, current->cols, pos, &n);
550 static int outputChars(struct current *current, const char *buf, int len)
552 COORD pos = { (SHORT)current->x, (SHORT)current->y };
555 WriteConsoleOutputCharacter(current->outh, buf, len, pos, &n);
560 static void outputControlChar(struct current *current, char ch)
562 COORD pos = { (SHORT)current->x, (SHORT)current->y };
565 FillConsoleOutputAttribute(current->outh, BACKGROUND_INTENSITY, 2, pos, &n);
566 outputChars(current, "^", 1);
567 outputChars(current, &ch, 1);
570 static void eraseEol(struct current *current)
572 COORD pos = { (SHORT)current->x, (SHORT)current->y };
575 FillConsoleOutputCharacter(current->outh, ' ', current->cols - current->x, pos, &n);
578 static void setCursorPos(struct current *current, int x)
580 COORD pos = { (SHORT)x, (SHORT)current->y };
582 SetConsoleCursorPosition(current->outh, pos);
586 static int fd_read(struct current *current)
591 if (WaitForSingleObject(current->inh, INFINITE) != WAIT_OBJECT_0) {
594 if (!ReadConsoleInput (current->inh, &irec, 1, &n)) {
597 if (irec.EventType == KEY_EVENT && irec.Event.KeyEvent.bKeyDown) {
598 KEY_EVENT_RECORD *k = &irec.Event.KeyEvent;
599 if (k->dwControlKeyState & ENHANCED_KEY) {
600 switch (k->wVirtualKeyCode) {
604 return SPECIAL_RIGHT;
610 return SPECIAL_INSERT;
612 return SPECIAL_DELETE;
618 return SPECIAL_PAGE_UP;
620 return SPECIAL_PAGE_DOWN;
623 /* Note that control characters are already translated in AsciiChar */
626 return k->uChar.UnicodeChar;
628 return k->uChar.AsciiChar;
636 static int getWindowSize(struct current *current)
638 CONSOLE_SCREEN_BUFFER_INFO info;
639 if (!GetConsoleScreenBufferInfo(current->outh, &info)) {
642 current->cols = info.dwSize.X;
643 current->rows = info.dwSize.Y;
644 if (current->cols <= 0 || current->rows <= 0) {
648 current->y = info.dwCursorPosition.Y;
649 current->x = info.dwCursorPosition.X;
654 static int utf8_getchars(char *buf, int c)
657 return utf8_fromunicode(buf, c);
665 * Returns the unicode character at the given offset,
668 static int get_char(struct current *current, int pos)
670 if (pos >= 0 && pos < current->chars) {
672 int i = utf8_index(current->buf, pos);
673 (void)utf8_tounicode(current->buf + i, &c);
679 static void refreshLine(const char *prompt, struct current *current)
685 const char *buf = current->buf;
686 int chars = current->chars;
687 int pos = current->pos;
692 /* Should intercept SIGWINCH. For now, just get the size every time */
693 getWindowSize(current);
695 plen = strlen(prompt);
696 pchars = utf8_strlen(prompt, plen);
698 /* Account for a line which is too long to fit in the window.
699 * Note that control chars require an extra column
702 /* How many cols are required to the left of 'pos'?
703 * The prompt, plus one extra for each control char
705 n = pchars + utf8_strlen(buf, current->len);
707 for (i = 0; i < pos; i++) {
708 b += utf8_tounicode(buf + b, &ch);
714 /* If too many are need, strip chars off the front of 'buf'
715 * until it fits. Note that if the current char is a control character,
716 * we need one extra col.
718 if (current->pos < current->chars && get_char(current, current->pos) < ' ') {
722 while (n >= current->cols && pos > 0) {
723 b = utf8_tounicode(buf, &ch);
733 /* Cursor to left edge, then the prompt */
734 cursorToLeft(current);
735 outputChars(current, prompt, plen);
737 /* Now the current buffer content */
739 /* Need special handling for control characters.
740 * If we hit 'cols', stop.
742 b = 0; /* unwritted bytes */
743 n = 0; /* How many control chars were written */
744 for (i = 0; i < chars; i++) {
746 int w = utf8_tounicode(buf + b, &ch);
750 if (pchars + i + n >= current->cols) {
754 /* A control character, so write the buffer so far */
755 outputChars(current, buf, b);
758 outputControlChar(current, ch + '@');
767 outputChars(current, buf, b);
769 /* Erase to right, move cursor to original position */
771 setCursorPos(current, pos + pchars + backup);
774 static void set_current(struct current *current, const char *str)
776 strncpy(current->buf, str, current->bufmax);
777 current->buf[current->bufmax - 1] = 0;
778 current->len = strlen(current->buf);
779 current->pos = current->chars = utf8_strlen(current->buf, current->len);
782 static int has_room(struct current *current, int bytes)
784 return current->len + bytes < current->bufmax - 1;
788 * Removes the char at 'pos'.
790 * Returns 1 if the line needs to be refreshed, 2 if not
791 * and 0 if nothing was removed
793 static int remove_char(struct current *current, int pos)
795 if (pos >= 0 && pos < current->chars) {
798 p1 = utf8_index(current->buf, pos);
799 p2 = p1 + utf8_index(current->buf + p1, 1);
802 /* optimise remove char in the case of removing the last char */
803 if (current->pos == pos + 1 && current->pos == current->chars) {
804 if (current->buf[pos] >= ' ' && utf8_strlen(current->prompt, -1) + utf8_strlen(current->buf, current->len) < current->cols - 1) {
806 fd_printf(current->fd, "\b \b");
811 /* Move the null char too */
812 memmove(current->buf + p1, current->buf + p2, current->len - p2 + 1);
813 current->len -= (p2 - p1);
816 if (current->pos > pos) {
825 * Insert 'ch' at position 'pos'
827 * Returns 1 if the line needs to be refreshed, 2 if not
828 * and 0 if nothing was inserted (no room)
830 static int insert_char(struct current *current, int pos, int ch)
833 int n = utf8_getchars(buf, ch);
835 if (has_room(current, n) && pos >= 0 && pos <= current->chars) {
838 p1 = utf8_index(current->buf, pos);
842 /* optimise the case where adding a single char to the end and no scrolling is needed */
843 if (current->pos == pos && current->chars == pos) {
844 if (ch >= ' ' && utf8_strlen(current->prompt, -1) + utf8_strlen(current->buf, current->len) < current->cols - 1) {
845 IGNORE_RC(write(current->fd, buf, n));
851 memmove(current->buf + p2, current->buf + p1, current->len - p1);
852 memcpy(current->buf + p1, buf, n);
856 if (current->pos >= pos) {
865 * Returns 0 if no chars were removed or non-zero otherwise.
867 static int remove_chars(struct current *current, int pos, int n)
870 while (n-- && remove_char(current, pos)) {
876 #ifndef NO_COMPLETION
877 static linenoiseCompletionCallback *completionCallback = NULL;
881 fprintf(stderr, "\x7");
886 static void freeCompletions(linenoiseCompletions *lc) {
888 for (i = 0; i < lc->len; i++)
893 static int completeLine(struct current *current) {
894 linenoiseCompletions lc = { 0, NULL };
897 completionCallback(current->buf,&lc);
901 size_t stop = 0, i = 0;
904 /* Show completion or original buffer */
906 struct current tmp = *current;
907 tmp.buf = lc.cvec[i];
908 tmp.pos = tmp.len = strlen(tmp.buf);
909 tmp.chars = utf8_strlen(tmp.buf, tmp.len);
910 refreshLine(current->prompt, &tmp);
912 refreshLine(current->prompt, current);
915 c = fd_read(current);
922 i = (i+1) % (lc.len+1);
923 if (i == lc.len) beep();
925 case 27: /* escape */
926 /* Re-show original buffer */
928 refreshLine(current->prompt, current);
933 /* Update buffer and return */
935 set_current(current,lc.cvec[i]);
943 freeCompletions(&lc);
944 return c; /* Return last read character */
947 /* Register a callback function to be called for tab-completion. */
948 void linenoiseSetCompletionCallback(linenoiseCompletionCallback *fn) {
949 completionCallback = fn;
952 void linenoiseAddCompletion(linenoiseCompletions *lc, const char *str) {
953 lc->cvec = (char **)realloc(lc->cvec,sizeof(char*)*(lc->len+1));
954 lc->cvec[lc->len++] = strdup(str);
959 static int linenoisePrompt(struct current *current) {
960 int history_index = 0;
962 /* The latest history entry is always our current buffer, that
963 * initially is just an empty string. */
964 linenoiseHistoryAdd("");
966 set_current(current, "");
967 refreshLine(current->prompt, current);
971 int c = fd_read(current);
973 #ifndef NO_COMPLETION
974 /* Only autocomplete when the callback is set. It returns < 0 when
975 * there was an error reading from fd. Otherwise it will return the
976 * character that should be handled next. */
977 if (c == '\t' && current->pos == current->chars && completionCallback != NULL) {
978 c = completeLine(current);
979 /* Return on errors */
980 if (c < 0) return current->len;
981 /* Read next character when 0 */
982 if (c == 0) continue;
987 if (c == -1) return current->len;
989 if (c == 27) { /* escape sequence */
990 c = check_special(current->fd);
994 case '\r': /* enter */
996 free(history[history_len]);
998 case ctrl('C'): /* ctrl-c */
1001 case 127: /* backspace */
1003 if (remove_char(current, current->pos - 1) == 1) {
1004 refreshLine(current->prompt, current);
1007 case ctrl('D'): /* ctrl-d */
1008 if (current->len == 0) {
1009 /* Empty line, so EOF */
1011 free(history[history_len]);
1014 /* Otherwise fall through to delete char to right of cursor */
1015 case SPECIAL_DELETE:
1016 if (remove_char(current, current->pos) == 1) {
1017 refreshLine(current->prompt, current);
1020 case SPECIAL_INSERT:
1021 /* Ignore. Expansion Hook.
1022 * Future possibility: Toggle Insert/Overwrite Modes
1025 case ctrl('W'): /* ctrl-w */
1026 /* eat any spaces on the left */
1028 int pos = current->pos;
1029 while (pos > 0 && get_char(current, pos - 1) == ' ') {
1033 /* now eat any non-spaces on the left */
1034 while (pos > 0 && get_char(current, pos - 1) != ' ') {
1038 if (remove_chars(current, pos, current->pos - pos)) {
1039 refreshLine(current->prompt, current);
1043 case ctrl('R'): /* ctrl-r */
1045 /* Display the reverse-i-search prompt and process chars */
1050 int searchpos = history_len - 1;
1055 const char *p = NULL;
1059 snprintf(rprompt, sizeof(rprompt), "(reverse-i-search)'%s': ", rbuf);
1060 refreshLine(rprompt, current);
1061 c = fd_read(current);
1062 if (c == ctrl('H') || c == 127) {
1064 int p = utf8_index(rbuf, --rchars);
1066 rlen = strlen(rbuf);
1072 c = check_special(current->fd);
1075 if (c == ctrl('P') || c == SPECIAL_UP) {
1076 /* Search for the previous (earlier) match */
1077 if (searchpos > 0) {
1082 else if (c == ctrl('N') || c == SPECIAL_DOWN) {
1083 /* Search for the next (later) match */
1084 if (searchpos < history_len) {
1090 else if (c >= ' ') {
1091 if (rlen >= (int)sizeof(rbuf) + 3) {
1095 n = utf8_getchars(rbuf + rlen, c);
1100 /* Adding a new char resets the search location */
1101 searchpos = history_len - 1;
1104 /* Exit from incremental search mode */
1108 /* Now search through the history for a match */
1109 for (; searchpos >= 0 && searchpos < history_len; searchpos += searchdir) {
1110 p = strstr(history[searchpos], rbuf);
1113 if (skipsame && strcmp(history[searchpos], current->buf) == 0) {
1114 /* But it is identical, so skip it */
1117 /* Copy the matching line and set the cursor position */
1118 set_current(current,history[searchpos]);
1119 current->pos = utf8_strlen(history[searchpos], p - history[searchpos]);
1124 /* No match, so don't add it */
1130 if (c == ctrl('G') || c == ctrl('C')) {
1131 /* ctrl-g terminates the search with no effect */
1132 set_current(current, "");
1135 else if (c == ctrl('J')) {
1136 /* ctrl-j terminates the search leaving the buffer in place */
1139 /* Go process the char normally */
1140 refreshLine(current->prompt, current);
1144 case ctrl('T'): /* ctrl-t */
1145 if (current->pos > 0 && current->pos <= current->chars) {
1146 /* If cursor is at end, transpose the previous two chars */
1147 int fixer = (current->pos == current->chars);
1148 c = get_char(current, current->pos - fixer);
1149 remove_char(current, current->pos - fixer);
1150 insert_char(current, current->pos - 1, c);
1151 refreshLine(current->prompt, current);
1154 case ctrl('V'): /* ctrl-v */
1155 if (has_room(current, 3)) {
1156 /* Insert the ^V first */
1157 if (insert_char(current, current->pos, c)) {
1158 refreshLine(current->prompt, current);
1159 /* Now wait for the next char. Can insert anything except \0 */
1160 c = fd_read(current);
1162 /* Remove the ^V first */
1163 remove_char(current, current->pos - 1);
1165 /* Insert the actual char */
1166 insert_char(current, current->pos, c);
1168 refreshLine(current->prompt, current);
1174 if (current->pos > 0) {
1176 refreshLine(current->prompt, current);
1181 if (current->pos < current->chars) {
1183 refreshLine(current->prompt, current);
1186 case SPECIAL_PAGE_UP:
1187 dir = history_len - history_index - 1; /* move to start of history */
1188 goto history_navigation;
1189 case SPECIAL_PAGE_DOWN:
1190 dir = -history_index; /* move to 0 == end of history, i.e. current */
1191 goto history_navigation;
1195 goto history_navigation;
1199 if (history_len > 1) {
1200 /* Update the current history entry before to
1201 * overwrite it with tne next one. */
1202 free(history[history_len - 1 - history_index]);
1203 history[history_len - 1 - history_index] = strdup(current->buf);
1204 /* Show the new entry */
1205 history_index += dir;
1206 if (history_index < 0) {
1209 } else if (history_index >= history_len) {
1210 history_index = history_len - 1;
1213 set_current(current, history[history_len - 1 - history_index]);
1214 refreshLine(current->prompt, current);
1217 case ctrl('A'): /* Ctrl+a, go to the start of the line */
1220 refreshLine(current->prompt, current);
1222 case ctrl('E'): /* ctrl+e, go to the end of the line */
1224 current->pos = current->chars;
1225 refreshLine(current->prompt, current);
1227 case ctrl('U'): /* Ctrl+u, delete to beginning of line. */
1228 if (remove_chars(current, 0, current->pos)) {
1229 refreshLine(current->prompt, current);
1232 case ctrl('K'): /* Ctrl+k, delete from current to end of line. */
1233 if (remove_chars(current, current->pos, current->chars - current->pos)) {
1234 refreshLine(current->prompt, current);
1237 case ctrl('L'): /* Ctrl+L, clear screen */
1238 clearScreen(current);
1239 /* Force recalc of window size for serial terminals */
1241 refreshLine(current->prompt, current);
1244 /* Only tab is allowed without ^V */
1245 if (c == '\t' || c >= ' ') {
1246 if (insert_char(current, current->pos, c) == 1) {
1247 refreshLine(current->prompt, current);
1253 return current->len;
1256 char *linenoise(const char *prompt)
1259 struct current current;
1260 char buf[LINENOISE_MAX_LINE];
1262 if (enableRawMode(¤t) == -1) {
1263 printf("%s", prompt);
1265 if (fgets(buf, sizeof(buf), stdin) == NULL) {
1268 count = strlen(buf);
1269 if (count && buf[count-1] == '\n') {
1277 current.bufmax = sizeof(buf);
1281 current.prompt = prompt;
1283 count = linenoisePrompt(¤t);
1284 disableRawMode(¤t);
1293 /* Using a circular buffer is smarter, but a bit more complex to handle. */
1294 int linenoiseHistoryAdd(const char *line) {
1297 if (history_max_len == 0) return 0;
1298 if (history == NULL) {
1299 history = (char **)malloc(sizeof(char*)*history_max_len);
1300 if (history == NULL) return 0;
1301 memset(history,0,(sizeof(char*)*history_max_len));
1304 /* do not insert duplicate lines into history */
1305 if (history_len > 0 && strcmp(line, history[history_len - 1]) == 0) {
1309 linecopy = strdup(line);
1310 if (!linecopy) return 0;
1311 if (history_len == history_max_len) {
1313 memmove(history,history+1,sizeof(char*)*(history_max_len-1));
1316 history[history_len] = linecopy;
1321 int linenoiseHistoryGetMaxLen(void) {
1322 return history_max_len;
1325 int linenoiseHistorySetMaxLen(int len) {
1328 if (len < 1) return 0;
1330 int tocopy = history_len;
1332 newHistory = (char **)malloc(sizeof(char*)*len);
1333 if (newHistory == NULL) return 0;
1334 if (len < tocopy) tocopy = len;
1335 memcpy(newHistory,history+(history_max_len-tocopy), sizeof(char*)*tocopy);
1337 history = newHistory;
1339 history_max_len = len;
1340 if (history_len > history_max_len)
1341 history_len = history_max_len;
1345 /* Save the history in the specified file. On success 0 is returned
1346 * otherwise -1 is returned. */
1347 int linenoiseHistorySave(const char *filename) {
1348 FILE *fp = fopen(filename,"w");
1351 if (fp == NULL) return -1;
1352 for (j = 0; j < history_len; j++) {
1353 const char *str = history[j];
1354 /* Need to encode backslash, nl and cr */
1359 else if (*str == '\n') {
1362 else if (*str == '\r') {
1377 /* Load the history from the specified file. If the file does not exist
1378 * zero is returned and no operation is performed.
1380 * If the file exists and the operation succeeded 0 is returned, otherwise
1381 * on error -1 is returned. */
1382 int linenoiseHistoryLoad(const char *filename) {
1383 FILE *fp = fopen(filename,"r");
1384 char buf[LINENOISE_MAX_LINE];
1386 if (fp == NULL) return -1;
1388 while (fgets(buf,LINENOISE_MAX_LINE,fp) != NULL) {
1391 /* Decode backslash escaped values */
1392 for (src = dest = buf; *src; src++) {
1400 else if (*src == 'r') {
1408 /* Remove trailing newline */
1409 if (dest != buf && (dest[-1] == '\n' || dest[-1] == '\r')) {
1414 linenoiseHistoryAdd(buf);
1420 /* Provide access to the history buffer.
1422 * If 'len' is not NULL, the length is stored in *len.
1424 char **linenoiseHistory(int *len) {