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: clear from cursor to end of line
63 * CUF (CUrsor Forward)
65 * Effect: moves cursor forward n chars
67 * CR (Carriage Return)
69 * Effect: moves cursor to column 1
71 * The following are used to clear the screen: ESC [ H ESC [ 2 J
72 * This is actually composed of two sequences:
76 * Effect: moves the cursor to upper left corner
78 * ED2 (Clear entire screen)
80 * Effect: clear the whole screen
82 * == For highlighting control characters, we also use the following two ==
85 * Effect: Uses some standout mode such as reverse video
89 * Effect: Exit standout mode
91 * == Only used if TIOCGWINSZ fails ==
92 * DSR/CPR (Report cursor position)
94 * Effect: reports current cursor position as ESC [ NNN ; MMM R
96 * == Only used in multiline mode ==
99 * Effect: moves cursor up n chars.
102 * Sequence: ESC [ n B
103 * Effect: moves cursor down n chars.
107 * If __MINGW32__ is defined, the win32 console API is used.
108 * This could probably be made to work for the msvc compiler too.
109 * This support based in part on work by Jon Griffiths.
112 #ifdef _WIN32 /* Windows platform, either MinGW or Visual Studio (MSVC) */
115 #define USE_WINCONSOLE
117 #define HAVE_UNISTD_H
119 /* Microsoft headers don't like old POSIX names */
120 #define strdup _strdup
121 #define snprintf _snprintf
125 #include <sys/ioctl.h>
128 #define HAVE_UNISTD_H
142 #include <sys/types.h>
144 #include "linenoise.h"
146 #include "stringbuf.h"
150 #define LINENOISE_DEFAULT_HISTORY_MAX_LEN 100
152 #define ctrl(C) ((C) - '@')
154 /* Use -ve numbers here to co-exist with normal unicode chars */
157 /* don't use -1 here since that indicates error */
162 SPECIAL_DELETE = -24,
165 SPECIAL_INSERT = -27,
166 SPECIAL_PAGE_UP = -28,
167 SPECIAL_PAGE_DOWN = -29,
169 /* Some handy names for other special keycodes */
174 static int history_max_len = LINENOISE_DEFAULT_HISTORY_MAX_LEN;
175 static int history_len = 0;
176 static char **history = NULL;
178 /* Structure to contain the status of the current (being edited) line */
180 stringbuf *buf; /* Current buffer. Always null terminated */
181 int pos; /* Cursor position, measured in chars */
182 int cols; /* Size of the window, in chars */
183 int nrows; /* How many rows are being used in multiline mode (>= 1) */
184 int rpos; /* The current row containing the cursor - multiline mode only */
185 int availcols; /* refreshLine() caches available cols after the prompt here */
187 stringbuf *capture; /* capture buffer, or NULL for none. Always null terminated */
188 stringbuf *output; /* used only during refreshLine() - output accumulator */
189 #if defined(USE_TERMIOS)
190 int fd; /* Terminal fd */
191 #elif defined(USE_WINCONSOLE)
192 HANDLE outh; /* Console output handle */
193 HANDLE inh; /* Console input handle */
194 int rows; /* Screen rows */
195 int x; /* Current column during output */
196 int y; /* Current row */
198 #define UBUF_MAX_CHARS 132
199 WORD ubuf[UBUF_MAX_CHARS + 1]; /* Accumulates utf16 output - one extra for final surrogate pairs */
200 int ubuflen; /* length used in ubuf */
201 int ubufcols; /* how many columns are represented by the chars in ubuf? */
206 static int fd_read(struct current *current);
207 static int getWindowSize(struct current *current);
208 static void cursorDown(struct current *current, int n);
209 static void cursorUp(struct current *current, int n);
210 static void eraseEol(struct current *current);
211 static void refreshLine(struct current *current);
212 static void refreshLineAlt(struct current *current, const char *prompt, const char *buf, int cursor_pos);
213 static void setCursorPos(struct current *current, int x);
214 static void setOutputHighlight(struct current *current, const int *props, int nprops);
215 static void set_current(struct current *current, const char *str);
217 void linenoiseHistoryFree(void) {
221 for (j = 0; j < history_len; j++)
231 EP_START, /* looking for ESC */
232 EP_ESC, /* looking for [ */
233 EP_DIGITS, /* parsing digits */
234 EP_PROPS, /* parsing digits or semicolons */
236 EP_ERROR, /* error */
238 int props[5]; /* properties are stored here */
239 int maxprops; /* size of the props[] array */
240 int numprops; /* number of properties found */
241 int termchar; /* terminator char, or 0 for any alpha */
242 int current; /* current (partial) property value */
246 * Initialise the escape sequence parser at *parser.
248 * If termchar is 0 any alpha char terminates ok. Otherwise only the given
249 * char terminates successfully.
250 * Run the parser state machine with calls to parseEscapeSequence() for each char.
252 static void initParseEscapeSeq(struct esc_parser *parser, int termchar)
254 parser->state = EP_START;
255 parser->maxprops = sizeof(parser->props) / sizeof(*parser->props);
256 parser->numprops = 0;
258 parser->termchar = termchar;
262 * Pass character 'ch' into the state machine to parse:
263 * 'ESC' '[' <digits> (';' <digits>)* <termchar>
265 * The first character must be ESC.
266 * Returns the current state. The state machine is done when it returns either EP_END
269 * On EP_END, the "property/attribute" values can be read from parser->props[]
270 * of length parser->numprops.
272 static int parseEscapeSequence(struct esc_parser *parser, int ch)
274 switch (parser->state) {
276 parser->state = (ch == '\x1b') ? EP_ESC : EP_ERROR;
279 parser->state = (ch == '[') ? EP_DIGITS : EP_ERROR;
283 parser->state = EP_DIGITS;
285 if (parser->numprops + 1 < parser->maxprops) {
286 parser->props[parser->numprops++] = parser->current;
293 if (ch >= '0' && ch <= '9') {
294 parser->current = parser->current * 10 + (ch - '0');
295 parser->state = EP_PROPS;
298 /* must be terminator */
299 if (parser->termchar != ch) {
300 if (parser->termchar != 0 || !((ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z'))) {
301 parser->state = EP_ERROR;
305 parser->state = EP_END;
308 parser->state = EP_ERROR;
313 return parser->state;
316 /*#define DEBUG_REFRESHLINE*/
318 #ifdef DEBUG_REFRESHLINE
319 #define DRL(ARGS...) fprintf(dfh, ARGS)
322 static void DRL_CHAR(int ch)
325 DRL("^%c", ch + '@');
334 static void DRL_STR(const char *str)
338 int n = utf8_tounicode(str, &ch);
349 #if defined(USE_WINCONSOLE)
350 #include "linenoise-win32.c"
353 #if defined(USE_TERMIOS)
354 static void linenoiseAtExit(void);
355 static struct termios orig_termios; /* in order to restore at exit */
356 static int rawmode = 0; /* for atexit() function to check if restore is needed*/
357 static int atexit_registered = 0; /* register atexit just 1 time */
359 static const char *unsupported_term[] = {"dumb","cons25","emacs",NULL};
361 static int isUnsupportedTerm(void) {
362 char *term = getenv("TERM");
366 for (j = 0; unsupported_term[j]; j++) {
367 if (strcmp(term, unsupported_term[j]) == 0) {
375 static int enableRawMode(struct current *current) {
378 current->fd = STDIN_FILENO;
381 if (!isatty(current->fd) || isUnsupportedTerm() ||
382 tcgetattr(current->fd, &orig_termios) == -1) {
388 if (!atexit_registered) {
389 atexit(linenoiseAtExit);
390 atexit_registered = 1;
393 raw = orig_termios; /* modify the original mode */
394 /* input modes: no break, no CR to NL, no parity check, no strip char,
395 * no start/stop output control. */
396 raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
397 /* output modes - actually, no need to disable post processing */
398 /*raw.c_oflag &= ~(OPOST);*/
399 /* control modes - set 8 bit chars */
400 raw.c_cflag |= (CS8);
401 /* local modes - choing off, canonical off, no extended functions,
402 * no signal chars (^Z,^C) */
403 raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
404 /* control chars - set return condition: min number of bytes and timer.
405 * We want read to return every single byte, without timeout. */
406 raw.c_cc[VMIN] = 1; raw.c_cc[VTIME] = 0; /* 1 byte, no timer */
408 /* put terminal in raw mode after flushing */
409 if (tcsetattr(current->fd,TCSADRAIN,&raw) < 0) {
416 static void disableRawMode(struct current *current) {
417 /* Don't even check the return value as it's too late. */
418 if (rawmode && tcsetattr(current->fd,TCSADRAIN,&orig_termios) != -1)
422 /* At exit we'll try to fix the terminal to the initial conditions. */
423 static void linenoiseAtExit(void) {
425 tcsetattr(STDIN_FILENO, TCSADRAIN, &orig_termios);
427 linenoiseHistoryFree();
430 /* gcc/glibc insists that we care about the return code of write!
431 * Clarification: This means that a void-cast like "(void) (EXPR)"
434 #define IGNORE_RC(EXPR) if (EXPR) {}
437 * Output bytes directly, or accumulate output (if current->output is set)
439 static void outputChars(struct current *current, const char *buf, int len)
444 if (current->output) {
445 sb_append_len(current->output, buf, len);
448 IGNORE_RC(write(current->fd, buf, len));
452 /* Like outputChars, but using printf-style formatting
454 static void outputFormatted(struct current *current, const char *format, ...)
460 va_start(args, format);
461 n = vsnprintf(buf, sizeof(buf), format, args);
462 /* This will never happen because we are sure to use outputFormatted() only for short sequences */
463 assert(n < (int)sizeof(buf));
465 outputChars(current, buf, n);
468 static void cursorToLeft(struct current *current)
470 outputChars(current, "\r", -1);
473 static void setOutputHighlight(struct current *current, const int *props, int nprops)
475 outputChars(current, "\x1b[", -1);
477 outputFormatted(current, "%d%c", *props, (nprops == 0) ? 'm' : ';');
482 static void eraseEol(struct current *current)
484 outputChars(current, "\x1b[0K", -1);
487 static void setCursorPos(struct current *current, int x)
490 cursorToLeft(current);
493 outputFormatted(current, "\r\x1b[%dC", x);
497 static void cursorUp(struct current *current, int n)
500 outputFormatted(current, "\x1b[%dA", n);
504 static void cursorDown(struct current *current, int n)
507 outputFormatted(current, "\x1b[%dB", n);
511 void linenoiseClearScreen(void)
513 IGNORE_RC(write(STDOUT_FILENO, "\x1b[H\x1b[2J", 7));
517 * Reads a char from 'fd', waiting at most 'timeout' milliseconds.
519 * A timeout of -1 means to wait forever.
521 * Returns -1 if no char is received within the time or an error occurs.
523 static int fd_read_char(int fd, int timeout)
531 if (poll(&p, 1, timeout) == 0) {
535 if (read(fd, &c, 1) != 1) {
542 * Reads a complete utf-8 character
543 * and returns the unicode value, or -1 on error.
545 static int fd_read(struct current *current)
548 char buf[MAX_UTF8_LEN];
553 if (read(current->fd, &buf[0], 1) != 1) {
556 n = utf8_charlen(buf[0]);
560 for (i = 1; i < n; i++) {
561 if (read(current->fd, &buf[i], 1) != 1) {
565 /* decode and return the character */
566 utf8_tounicode(buf, &c);
569 return fd_read_char(current->fd, -1);
575 * Stores the current cursor column in '*cols'.
576 * Returns 1 if OK, or 0 if failed to determine cursor pos.
578 static int queryCursor(struct current *current, int* cols)
580 struct esc_parser parser;
583 /* Should not be buffering this output, it needs to go immediately */
584 assert(current->output == NULL);
586 /* control sequence - report cursor location */
587 outputChars(current, "\x1b[6n", -1);
589 /* Parse the response: ESC [ rows ; cols R */
590 initParseEscapeSeq(&parser, 'R');
591 while ((ch = fd_read_char(current->fd, 100)) > 0) {
592 switch (parseEscapeSequence(&parser, ch)) {
596 if (parser.numprops == 2 && parser.props[1] < 1000) {
597 *cols = parser.props[1];
611 * Updates current->cols with the current window size (width)
613 static int getWindowSize(struct current *current)
617 if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == 0 && ws.ws_col != 0) {
618 current->cols = ws.ws_col;
622 /* Failed to query the window size. Perhaps we are on a serial terminal.
623 * Try to query the width by sending the cursor as far to the right
624 * and reading back the cursor position.
625 * Note that this is only done once per call to linenoise rather than
626 * every time the line is refreshed for efficiency reasons.
628 * In more detail, we:
629 * (a) request current cursor position,
630 * (b) move cursor far right,
631 * (c) request cursor position again,
632 * (d) at last move back to the old position.
633 * This gives us the width without messing with the externally
634 * visible cursor position.
637 if (current->cols == 0) {
640 /* If anything fails => default 80 */
644 if (queryCursor (current, &here)) {
646 setCursorPos(current, 999);
648 /* (c). Note: If (a) succeeded, then (c) should as well.
649 * For paranoia we still check and have a fallback action
650 * for (d) in case of failure..
652 if (queryCursor (current, ¤t->cols)) {
653 /* (d) Reset the cursor back to the original location. */
654 if (current->cols > here) {
655 setCursorPos(current, here);
665 * If CHAR_ESCAPE was received, reads subsequent
666 * chars to determine if this is a known special key.
668 * Returns SPECIAL_NONE if unrecognised, or -1 if EOF.
670 * If no additional char is received within a short time,
671 * CHAR_ESCAPE is returned.
673 static int check_special(int fd)
675 int c = fd_read_char(fd, 50);
682 c2 = fd_read_char(fd, 50);
686 if (c == '[' || c == 'O') {
687 /* Potential arrow key */
694 return SPECIAL_RIGHT;
703 if (c == '[' && c2 >= '1' && c2 <= '8') {
704 /* extended escape */
705 c = fd_read_char(fd, 50);
709 return SPECIAL_INSERT;
711 return SPECIAL_DELETE;
713 return SPECIAL_PAGE_UP;
715 return SPECIAL_PAGE_DOWN;
722 while (c != -1 && c != '~') {
723 /* .e.g \e[12~ or '\e[11;2~ discard the complete sequence */
724 c = fd_read_char(fd, 50);
732 static void clearOutputHighlight(struct current *current)
735 setOutputHighlight(current, &nohighlight, 1);
738 static void outputControlChar(struct current *current, char ch)
741 setOutputHighlight(current, &reverse, 1);
742 outputChars(current, "^", 1);
743 outputChars(current, &ch, 1);
744 clearOutputHighlight(current);
747 #ifndef utf8_getchars
748 static int utf8_getchars(char *buf, int c)
751 return utf8_fromunicode(buf, c);
760 * Returns the unicode character at the given offset,
763 static int get_char(struct current *current, int pos)
765 if (pos >= 0 && pos < sb_chars(current->buf)) {
767 int i = utf8_index(sb_str(current->buf), pos);
768 (void)utf8_tounicode(sb_str(current->buf) + i, &c);
774 static int char_display_width(int ch)
777 /* control chars take two positions */
781 return utf8_width(ch);
785 #ifndef NO_COMPLETION
786 static linenoiseCompletionCallback *completionCallback = NULL;
787 static void *completionUserdata = NULL;
788 static int showhints = 1;
789 static linenoiseHintsCallback *hintsCallback = NULL;
790 static linenoiseFreeHintsCallback *freeHintsCallback = NULL;
791 static void *hintsUserdata = NULL;
795 fprintf(stderr, "\x7");
800 static void freeCompletions(linenoiseCompletions *lc) {
802 for (i = 0; i < lc->len; i++)
807 static int completeLine(struct current *current) {
808 linenoiseCompletions lc = { 0, NULL };
811 completionCallback(sb_str(current->buf),&lc,completionUserdata);
815 size_t stop = 0, i = 0;
818 /* Show completion or original buffer */
820 int chars = utf8_strlen(lc.cvec[i], -1);
821 refreshLineAlt(current, current->prompt, lc.cvec[i], chars);
823 refreshLine(current);
826 c = fd_read(current);
833 i = (i+1) % (lc.len+1);
834 if (i == lc.len) beep();
836 case CHAR_ESCAPE: /* escape */
837 /* Re-show original buffer */
839 refreshLine(current);
844 /* Update buffer and return */
846 set_current(current,lc.cvec[i]);
854 freeCompletions(&lc);
855 return c; /* Return last read character */
858 /* Register a callback function to be called for tab-completion.
859 Returns the prior callback so that the caller may (if needed)
860 restore it when done. */
861 linenoiseCompletionCallback * linenoiseSetCompletionCallback(linenoiseCompletionCallback *fn, void *userdata) {
862 linenoiseCompletionCallback * old = completionCallback;
863 completionCallback = fn;
864 completionUserdata = userdata;
868 void linenoiseAddCompletion(linenoiseCompletions *lc, const char *str) {
869 lc->cvec = (char **)realloc(lc->cvec,sizeof(char*)*(lc->len+1));
870 lc->cvec[lc->len++] = strdup(str);
873 void linenoiseSetHintsCallback(linenoiseHintsCallback *callback, void *userdata)
875 hintsCallback = callback;
876 hintsUserdata = userdata;
879 void linenoiseSetFreeHintsCallback(linenoiseFreeHintsCallback *callback)
881 freeHintsCallback = callback;
887 static const char *reduceSingleBuf(const char *buf, int availcols, int *cursor_pos)
889 /* We have availcols columns available.
890 * If necessary, strip chars off the front of buf until *cursor_pos
891 * fits within availcols
895 int new_cursor_pos = *cursor_pos;
896 const char *pt = buf;
898 DRL("reduceSingleBuf: availcols=%d, cursor_pos=%d\n", availcols, *cursor_pos);
902 int n = utf8_tounicode(pt, &ch);
905 needcols += char_display_width(ch);
907 /* If we need too many cols, strip
908 * chars off the front of buf to make it fit.
909 * We keep 3 extra cols to the right of the cursor.
910 * 2 for possible wide chars, 1 for the last column that
913 while (needcols >= availcols - 3) {
914 n = utf8_tounicode(buf, &ch);
916 needcols -= char_display_width(ch);
919 /* and adjust the apparent cursor position */
923 /* can't remove more than this */
928 if (pos++ == *cursor_pos) {
935 DRL("\nafter reduce, needcols=%d, new_cursor_pos=%d\n", needcols, new_cursor_pos);
937 /* Done, now new_cursor_pos contains the adjusted cursor position
938 * and buf points to he adjusted start
940 *cursor_pos = new_cursor_pos;
944 static int mlmode = 0;
946 void linenoiseSetMultiLine(int enableml)
951 /* Helper of refreshSingleLine() and refreshMultiLine() to show hints
952 * to the right of the prompt.
953 * Returns 1 if a hint was shown, or 0 if not
954 * If 'display' is 0, does no output. Just returns the appropriate return code.
956 static int refreshShowHints(struct current *current, const char *buf, int availcols, int display)
959 if (showhints && hintsCallback && availcols > 0) {
962 char *hint = hintsCallback(buf, &color, &bold, hintsUserdata);
967 if (bold == 1 && color == -1) color = 37;
968 if (bold || color > 0) {
969 int props[3] = { bold, color, 49 }; /* bold, color, fgnormal */
970 setOutputHighlight(current, props, 3);
972 DRL("<hint bold=%d,color=%d>", bold, color);
976 int n = utf8_tounicode(pt, &ch);
977 int width = char_display_width(ch);
979 if (width >= availcols) {
986 outputChars(current, pt, n);
989 if (bold || color > 0) {
990 clearOutputHighlight(current);
992 /* Call the function to free the hint returned. */
993 if (freeHintsCallback) freeHintsCallback(hint, hintsUserdata);
1001 static void refreshStart(struct current *current)
1003 /* We accumulate all output here */
1004 assert(current->output == NULL);
1005 current->output = sb_alloc();
1008 static void refreshEnd(struct current *current)
1010 /* Output everything at once */
1011 IGNORE_RC(write(current->fd, sb_str(current->output), sb_len(current->output)));
1012 sb_free(current->output);
1013 current->output = NULL;
1016 static void refreshStartChars(struct current *current)
1020 static void refreshNewline(struct current *current)
1023 outputChars(current, "\n", 1);
1026 static void refreshEndChars(struct current *current)
1031 static void refreshLineAlt(struct current *current, const char *prompt, const char *buf, int cursor_pos)
1043 struct esc_parser parser;
1045 #ifdef DEBUG_REFRESHLINE
1046 dfh = fopen("linenoise.debuglog", "a");
1049 /* Should intercept SIGWINCH. For now, just get the size every time */
1050 getWindowSize(current);
1052 refreshStart(current);
1054 DRL("wincols=%d, cursor_pos=%d, nrows=%d, rpos=%d\n", current->cols, cursor_pos, current->nrows, current->rpos);
1056 /* Here is the plan:
1057 * (a) move the the bottom row, going down the appropriate number of lines
1058 * (b) move to beginning of line and erase the current line
1059 * (c) go up one line and do the same, until we have erased up to the first row
1060 * (d) output the prompt, counting cols and rows, taking into account escape sequences
1061 * (e) output the buffer, counting cols and rows
1062 * (e') when we hit the current pos, save the cursor position
1063 * (f) move the cursor to the saved cursor position
1064 * (g) save the current cursor row and number of rows
1067 /* (a) - The cursor is currently at row rpos */
1068 cursorDown(current, current->nrows - current->rpos - 1);
1069 DRL("<cud=%d>", current->nrows - current->rpos - 1);
1071 /* (b), (c) - Erase lines upwards until we get to the first row */
1072 for (i = 0; i < current->nrows; i++) {
1075 cursorUp(current, 1);
1078 cursorToLeft(current);
1083 /* (d) First output the prompt. control sequences don't take up display space */
1085 displaycol = 0; /* current display column */
1086 displayrow = 0; /* current display row */
1089 refreshStartChars(current);
1094 int n = utf8_tounicode(pt, &ch);
1096 if (visible && ch == CHAR_ESCAPE) {
1097 /* The start of an escape sequence, so not visible */
1099 initParseEscapeSeq(&parser, 'm');
1100 DRL("<esc-seq-start>");
1103 if (ch == '\n' || ch == '\r') {
1104 /* treat both CR and NL the same and force wrap */
1105 refreshNewline(current);
1110 width = visible * utf8_width(ch);
1112 displaycol += width;
1113 if (displaycol >= current->cols) {
1114 /* need to wrap to the next line because of newline or if it doesn't fit
1115 * XXX this is a problem in single line mode
1117 refreshNewline(current);
1123 #ifdef USE_WINCONSOLE
1125 outputChars(current, pt, n);
1128 outputChars(current, pt, n);
1134 switch (parseEscapeSequence(&parser, ch)) {
1137 setOutputHighlight(current, parser.props, parser.numprops);
1138 DRL("<esc-seq-end,numprops=%d>", parser.numprops);
1141 DRL("<esc-seq-err>");
1148 /* Now we are at the first line with all lines erased */
1149 DRL("\nafter prompt: displaycol=%d, displayrow=%d\n", displaycol, displayrow);
1152 /* (e) output the buffer, counting cols and rows */
1154 /* In this mode we may need to trim chars from the start of the buffer until the
1155 * cursor fits in the window.
1157 pt = reduceSingleBuf(buf, current->cols - displaycol, &cursor_pos);
1168 int n = utf8_tounicode(pt, &ch);
1169 int width = char_display_width(ch);
1171 if (currentpos == cursor_pos) {
1172 /* (e') wherever we output this character is where we want the cursor */
1176 if (displaycol + width >= current->cols) {
1178 /* In single line mode stop once we print as much as we can on one line */
1182 /* need to wrap to the next line since it doesn't fit */
1183 refreshNewline(current);
1188 if (notecursor == 1) {
1189 /* (e') Save this position as the current cursor position */
1190 cursorcol = displaycol;
1191 cursorrow = displayrow;
1196 displaycol += width;
1199 outputControlChar(current, ch + '@');
1202 outputChars(current, pt, n);
1206 DRL("<w=%d>", width);
1213 /* If we didn't see the cursor, it is at the current location */
1216 cursorcol = displaycol;
1217 cursorrow = displayrow;
1220 DRL("\nafter buf: displaycol=%d, displayrow=%d, cursorcol=%d, cursorrow=%d\n\n", displaycol, displayrow, cursorcol, cursorrow);
1222 /* (f) show hints */
1223 hint = refreshShowHints(current, buf, current->cols - displaycol, 1);
1225 /* Remember how many many cols are available for insert optimisation */
1226 if (prompt == current->prompt && hint == 0) {
1227 current->availcols = current->cols - displaycol;
1230 /* Can't optimise */
1231 current->availcols = 0;
1234 refreshEndChars(current);
1236 /* (g) move the cursor to the correct place */
1237 cursorUp(current, displayrow - cursorrow);
1238 setCursorPos(current, cursorcol);
1240 /* (h) Update the number of rows if larger, but never reduce this */
1241 if (displayrow >= current->nrows) {
1242 current->nrows = displayrow + 1;
1244 /* And remember the row that the cursor is on */
1245 current->rpos = cursorrow;
1247 refreshEnd(current);
1249 #ifdef DEBUG_REFRESHLINE
1254 static void refreshLine(struct current *current)
1256 refreshLineAlt(current, current->prompt, sb_str(current->buf), current->pos);
1259 static void set_current(struct current *current, const char *str)
1261 sb_clear(current->buf);
1262 sb_append(current->buf, str);
1263 current->pos = sb_chars(current->buf);
1267 * Removes the char at 'pos'.
1269 * Returns 1 if the line needs to be refreshed, 2 if not
1270 * and 0 if nothing was removed
1272 static int remove_char(struct current *current, int pos)
1274 if (pos >= 0 && pos < sb_chars(current->buf)) {
1275 int offset = utf8_index(sb_str(current->buf), pos);
1276 int nbytes = utf8_index(sb_str(current->buf) + offset, 1);
1278 /* Note that we no longer try to optimise the remove-at-end case
1279 * since control characters and wide characters mess
1280 * up the simple count
1282 sb_delete(current->buf, offset, nbytes);
1284 if (current->pos > pos) {
1293 * Insert 'ch' at position 'pos'
1295 * Returns 1 if the line needs to be refreshed, 2 if not
1296 * and 0 if nothing was inserted (no room)
1298 static int insert_char(struct current *current, int pos, int ch)
1300 if (pos >= 0 && pos <= sb_chars(current->buf)) {
1301 char buf[MAX_UTF8_LEN + 1];
1302 int offset = utf8_index(sb_str(current->buf), pos);
1303 int n = utf8_getchars(buf, ch);
1306 /* null terminate since sb_insert() requires it */
1309 /* Now we try to optimise in the simple but very common case that:
1310 * - we are inserting at EOL
1311 * - there are enough columns available
1312 * - no hints are being shown
1314 if (pos == current->pos && pos == sb_chars(current->buf)) {
1315 int width = char_display_width(ch);
1316 if (current->availcols > width) {
1317 /* Yes, can optimise */
1318 current->availcols -= width;
1322 sb_insert(current->buf, offset, buf);
1323 if (current->pos >= pos) {
1327 if (refreshShowHints(current, sb_str(current->buf), current->availcols, 0)) {
1328 /* A hint needs to be shown, so can't optimise after all */
1332 /* optimised output */
1333 outputChars(current, buf, n);
1342 * Captures up to 'n' characters starting at 'pos' for the cut buffer.
1344 * This replaces any existing characters in the cut buffer.
1346 static void capture_chars(struct current *current, int pos, int nchars)
1348 if (pos >= 0 && (pos + nchars - 1) < sb_chars(current->buf)) {
1349 int offset = utf8_index(sb_str(current->buf), pos);
1350 int nbytes = utf8_index(sb_str(current->buf) + offset, nchars);
1353 if (current->capture) {
1354 sb_clear(current->capture);
1357 current->capture = sb_alloc();
1359 sb_append_len(current->capture, sb_str(current->buf) + offset, nbytes);
1365 * Removes up to 'n' characters at cursor position 'pos'.
1367 * Returns 0 if no chars were removed or non-zero otherwise.
1369 static int remove_chars(struct current *current, int pos, int n)
1373 /* First save any chars which will be removed */
1374 capture_chars(current, pos, n);
1376 while (n-- && remove_char(current, pos)) {
1382 * Inserts the characters (string) 'chars' at the cursor position 'pos'.
1384 * Returns 0 if no chars were inserted or non-zero otherwise.
1386 static int insert_chars(struct current *current, int pos, const char *chars)
1392 int n = utf8_tounicode(chars, &ch);
1393 if (insert_char(current, pos, ch) == 0) {
1404 * Returns the keycode to process, or 0 if none.
1406 static int reverseIncrementalSearch(struct current *current)
1408 /* Display the reverse-i-search prompt and process chars */
1413 int searchpos = history_len - 1;
1419 const char *p = NULL;
1423 snprintf(rprompt, sizeof(rprompt), "(reverse-i-search)'%s': ", rbuf);
1424 refreshLineAlt(current, rprompt, sb_str(current->buf), current->pos);
1425 c = fd_read(current);
1426 if (c == ctrl('H') || c == CHAR_DELETE) {
1428 int p = utf8_index(rbuf, --rchars);
1430 rlen = strlen(rbuf);
1435 if (c == CHAR_ESCAPE) {
1436 c = check_special(current->fd);
1439 if (c == ctrl('P') || c == SPECIAL_UP) {
1440 /* Search for the previous (earlier) match */
1441 if (searchpos > 0) {
1446 else if (c == ctrl('N') || c == SPECIAL_DOWN) {
1447 /* Search for the next (later) match */
1448 if (searchpos < history_len) {
1454 else if (c >= ' ') {
1455 /* >= here to allow for null terminator */
1456 if (rlen >= (int)sizeof(rbuf) - MAX_UTF8_LEN) {
1460 n = utf8_getchars(rbuf + rlen, c);
1465 /* Adding a new char resets the search location */
1466 searchpos = history_len - 1;
1469 /* Exit from incremental search mode */
1473 /* Now search through the history for a match */
1474 for (; searchpos >= 0 && searchpos < history_len; searchpos += searchdir) {
1475 p = strstr(history[searchpos], rbuf);
1478 if (skipsame && strcmp(history[searchpos], sb_str(current->buf)) == 0) {
1479 /* But it is identical, so skip it */
1482 /* Copy the matching line and set the cursor position */
1483 set_current(current,history[searchpos]);
1484 current->pos = utf8_strlen(history[searchpos], p - history[searchpos]);
1489 /* No match, so don't add it */
1495 if (c == ctrl('G') || c == ctrl('C')) {
1496 /* ctrl-g terminates the search with no effect */
1497 set_current(current, "");
1500 else if (c == ctrl('J')) {
1501 /* ctrl-j terminates the search leaving the buffer in place */
1505 /* Go process the char normally */
1506 refreshLine(current);
1510 static int linenoiseEdit(struct current *current) {
1511 int history_index = 0;
1513 /* The latest history entry is always our current buffer, that
1514 * initially is just an empty string. */
1515 linenoiseHistoryAdd("");
1517 set_current(current, "");
1518 refreshLine(current);
1522 int c = fd_read(current);
1524 #ifndef NO_COMPLETION
1525 /* Only autocomplete when the callback is set. It returns < 0 when
1526 * there was an error reading from fd. Otherwise it will return the
1527 * character that should be handled next. */
1528 if (c == '\t' && current->pos == sb_chars(current->buf) && completionCallback != NULL) {
1529 c = completeLine(current);
1532 if (c == ctrl('R')) {
1533 /* reverse incremental search will provide an alternative keycode or 0 for none */
1534 c = reverseIncrementalSearch(current);
1535 /* go on to process the returned char normally */
1539 if (c == CHAR_ESCAPE) { /* escape sequence */
1540 c = check_special(current->fd);
1544 /* Return on errors */
1545 return sb_len(current->buf);
1551 case '\r': /* enter */
1553 free(history[history_len]);
1554 current->pos = sb_chars(current->buf);
1555 if (mlmode || hintsCallback) {
1557 refreshLine(current);
1560 return sb_len(current->buf);
1561 case ctrl('C'): /* ctrl-c */
1564 case ctrl('Z'): /* ctrl-z */
1566 /* send ourselves SIGSUSP */
1567 disableRawMode(current);
1570 enableRawMode(current);
1571 refreshLine(current);
1574 case CHAR_DELETE: /* backspace */
1576 if (remove_char(current, current->pos - 1) == 1) {
1577 refreshLine(current);
1580 case ctrl('D'): /* ctrl-d */
1581 if (sb_len(current->buf) == 0) {
1582 /* Empty line, so EOF */
1584 free(history[history_len]);
1587 /* Otherwise fall through to delete char to right of cursor */
1588 case SPECIAL_DELETE:
1589 if (remove_char(current, current->pos) == 1) {
1590 refreshLine(current);
1593 case SPECIAL_INSERT:
1594 /* Ignore. Expansion Hook.
1595 * Future possibility: Toggle Insert/Overwrite Modes
1598 case ctrl('W'): /* ctrl-w, delete word at left. save deleted chars */
1599 /* eat any spaces on the left */
1601 int pos = current->pos;
1602 while (pos > 0 && get_char(current, pos - 1) == ' ') {
1606 /* now eat any non-spaces on the left */
1607 while (pos > 0 && get_char(current, pos - 1) != ' ') {
1611 if (remove_chars(current, pos, current->pos - pos)) {
1612 refreshLine(current);
1616 case ctrl('T'): /* ctrl-t */
1617 if (current->pos > 0 && current->pos <= sb_chars(current->buf)) {
1618 /* If cursor is at end, transpose the previous two chars */
1619 int fixer = (current->pos == sb_chars(current->buf));
1620 c = get_char(current, current->pos - fixer);
1621 remove_char(current, current->pos - fixer);
1622 insert_char(current, current->pos - 1, c);
1623 refreshLine(current);
1626 case ctrl('V'): /* ctrl-v */
1627 /* Insert the ^V first */
1628 if (insert_char(current, current->pos, c)) {
1629 refreshLine(current);
1630 /* Now wait for the next char. Can insert anything except \0 */
1631 c = fd_read(current);
1633 /* Remove the ^V first */
1634 remove_char(current, current->pos - 1);
1636 /* Insert the actual char, can't be error or null */
1637 insert_char(current, current->pos, c);
1639 refreshLine(current);
1644 if (current->pos > 0) {
1646 refreshLine(current);
1651 if (current->pos < sb_chars(current->buf)) {
1653 refreshLine(current);
1656 case SPECIAL_PAGE_UP:
1657 dir = history_len - history_index - 1; /* move to start of history */
1658 goto history_navigation;
1659 case SPECIAL_PAGE_DOWN:
1660 dir = -history_index; /* move to 0 == end of history, i.e. current */
1661 goto history_navigation;
1665 goto history_navigation;
1669 if (history_len > 1) {
1670 /* Update the current history entry before to
1671 * overwrite it with tne next one. */
1672 free(history[history_len - 1 - history_index]);
1673 history[history_len - 1 - history_index] = strdup(sb_str(current->buf));
1674 /* Show the new entry */
1675 history_index += dir;
1676 if (history_index < 0) {
1679 } else if (history_index >= history_len) {
1680 history_index = history_len - 1;
1683 set_current(current, history[history_len - 1 - history_index]);
1684 refreshLine(current);
1687 case ctrl('A'): /* Ctrl+a, go to the start of the line */
1690 refreshLine(current);
1692 case ctrl('E'): /* ctrl+e, go to the end of the line */
1694 current->pos = sb_chars(current->buf);
1695 refreshLine(current);
1697 case ctrl('U'): /* Ctrl+u, delete to beginning of line, save deleted chars. */
1698 if (remove_chars(current, 0, current->pos)) {
1699 refreshLine(current);
1702 case ctrl('K'): /* Ctrl+k, delete from current to end of line, save deleted chars. */
1703 if (remove_chars(current, current->pos, sb_chars(current->buf) - current->pos)) {
1704 refreshLine(current);
1707 case ctrl('Y'): /* Ctrl+y, insert saved chars at current position */
1708 if (current->capture && insert_chars(current, current->pos, sb_str(current->capture))) {
1709 refreshLine(current);
1712 case ctrl('L'): /* Ctrl+L, clear screen */
1713 linenoiseClearScreen();
1714 /* Force recalc of window size for serial terminals */
1717 refreshLine(current);
1720 /* Only tab is allowed without ^V */
1721 if (c == '\t' || c >= ' ') {
1722 if (insert_char(current, current->pos, c) == 1) {
1723 refreshLine(current);
1729 return sb_len(current->buf);
1732 int linenoiseColumns(void)
1734 struct current current;
1735 enableRawMode (¤t);
1736 getWindowSize (¤t);
1737 disableRawMode (¤t);
1738 return current.cols;
1742 * Reads a line from the file handle (without the trailing NL or CRNL)
1743 * and returns it in a stringbuf.
1744 * Returns NULL if no characters are read before EOF or error.
1746 * Note that the character count will *not* be correct for lines containing
1747 * utf8 sequences. Do not rely on the character count.
1749 static stringbuf *sb_getline(FILE *fh)
1751 stringbuf *sb = sb_alloc();
1755 while ((c = getc(fh)) != EOF) {
1762 if (c == '\n' || c == '\r') {
1766 /* ignore the effect of character count for partial utf8 sequences */
1767 sb_append_len(sb, &ch, 1);
1776 char *linenoise(const char *prompt)
1779 struct current current;
1782 memset(¤t, 0, sizeof(current));
1784 if (enableRawMode(¤t) == -1) {
1785 printf("%s", prompt);
1787 sb = sb_getline(stdin);
1790 current.buf = sb_alloc();
1793 current.prompt = prompt;
1795 count = linenoiseEdit(¤t);
1797 disableRawMode(¤t);
1800 sb_free(current.capture);
1802 sb_free(current.buf);
1807 return sb ? sb_to_string(sb) : NULL;
1810 /* Using a circular buffer is smarter, but a bit more complex to handle. */
1811 int linenoiseHistoryAddAllocated(char *line) {
1813 if (history_max_len == 0) {
1818 if (history == NULL) {
1819 history = (char **)calloc(sizeof(char*), history_max_len);
1822 /* do not insert duplicate lines into history */
1823 if (history_len > 0 && strcmp(line, history[history_len - 1]) == 0) {
1827 if (history_len == history_max_len) {
1829 memmove(history,history+1,sizeof(char*)*(history_max_len-1));
1832 history[history_len] = line;
1837 int linenoiseHistoryAdd(const char *line) {
1838 return linenoiseHistoryAddAllocated(strdup(line));
1841 int linenoiseHistoryGetMaxLen(void) {
1842 return history_max_len;
1845 int linenoiseHistorySetMaxLen(int len) {
1848 if (len < 1) return 0;
1850 int tocopy = history_len;
1852 newHistory = (char **)calloc(sizeof(char*), len);
1854 /* If we can't copy everything, free the elements we'll not use. */
1858 for (j = 0; j < tocopy-len; j++) free(history[j]);
1861 memcpy(newHistory,history+(history_len-tocopy), sizeof(char*)*tocopy);
1863 history = newHistory;
1865 history_max_len = len;
1866 if (history_len > history_max_len)
1867 history_len = history_max_len;
1871 /* Save the history in the specified file. On success 0 is returned
1872 * otherwise -1 is returned. */
1873 int linenoiseHistorySave(const char *filename) {
1874 FILE *fp = fopen(filename,"w");
1877 if (fp == NULL) return -1;
1878 for (j = 0; j < history_len; j++) {
1879 const char *str = history[j];
1880 /* Need to encode backslash, nl and cr */
1885 else if (*str == '\n') {
1888 else if (*str == '\r') {
1903 /* Load the history from the specified file.
1905 * If the file does not exist or can't be opened, no operation is performed
1906 * and -1 is returned.
1907 * Otherwise 0 is returned.
1909 int linenoiseHistoryLoad(const char *filename) {
1910 FILE *fp = fopen(filename,"r");
1913 if (fp == NULL) return -1;
1915 while ((sb = sb_getline(fp)) != NULL) {
1916 /* Take the stringbuf and decode backslash escaped values */
1917 char *buf = sb_to_string(sb);
1921 for (src = buf; *src; src++) {
1929 else if (*src == 'r') {
1939 linenoiseHistoryAddAllocated(buf);
1945 /* Provide access to the history buffer.
1947 * If 'len' is not NULL, the length is stored in *len.
1949 char **linenoiseHistory(int *len) {