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mame/3rdparty/linenoise/linenoise.c

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/* linenoise.c -- guerrilla line editing library against the idea that a
* line editing lib needs to be 20,000 lines of C code.
*
* You can find the latest source code at:
*
* http://github.com/msteveb/linenoise
* (forked from http://github.com/antirez/linenoise)
*
* Does a number of crazy assumptions that happen to be true in 99.9999% of
* the 2010 UNIX computers around.
*
* ------------------------------------------------------------------------
*
* Copyright (c) 2010, Salvatore Sanfilippo <antirez at gmail dot com>
* Copyright (c) 2010, Pieter Noordhuis <pcnoordhuis at gmail dot com>
* Copyright (c) 2011, Steve Bennett <steveb at workware dot net dot au>
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* ------------------------------------------------------------------------
*
* References:
* - http://invisible-island.net/xterm/ctlseqs/ctlseqs.html
* - http://www.3waylabs.com/nw/WWW/products/wizcon/vt220.html
*
* Bloat:
* - Completion?
*
* Unix/termios
* ------------
* List of escape sequences used by this program, we do everything just
* a few sequences. In order to be so cheap we may have some
* flickering effect with some slow terminal, but the lesser sequences
* the more compatible.
*
* EL (Erase Line)
* Sequence: ESC [ 0 K
* Effect: clear from cursor to end of line
*
* CUF (CUrsor Forward)
* Sequence: ESC [ n C
* Effect: moves cursor forward n chars
*
* CR (Carriage Return)
* Sequence: \r
* Effect: moves cursor to column 1
*
* The following are used to clear the screen: ESC [ H ESC [ 2 J
* This is actually composed of two sequences:
*
* cursorhome
* Sequence: ESC [ H
* Effect: moves the cursor to upper left corner
*
* ED2 (Clear entire screen)
* Sequence: ESC [ 2 J
* Effect: clear the whole screen
*
* == For highlighting control characters, we also use the following two ==
* SO (enter StandOut)
* Sequence: ESC [ 7 m
* Effect: Uses some standout mode such as reverse video
*
* SE (Standout End)
* Sequence: ESC [ 0 m
* Effect: Exit standout mode
*
* == Only used if TIOCGWINSZ fails ==
* DSR/CPR (Report cursor position)
* Sequence: ESC [ 6 n
* Effect: reports current cursor position as ESC [ NNN ; MMM R
*
* == Only used in multiline mode ==
* CUU (Cursor Up)
* Sequence: ESC [ n A
* Effect: moves cursor up n chars.
*
* CUD (Cursor Down)
* Sequence: ESC [ n B
* Effect: moves cursor down n chars.
*
* win32/console
* -------------
* If __MINGW32__ is defined, the win32 console API is used.
* This could probably be made to work for the msvc compiler too.
* This support based in part on work by Jon Griffiths.
*/
#ifdef _WIN32 /* Windows platform, either MinGW or Visual Studio (MSVC) */
#include <windows.h>
#include <fcntl.h>
#define USE_WINCONSOLE
#ifdef __MINGW32__
#define HAVE_UNISTD_H
#endif
#else
#include <termios.h>
#include <sys/ioctl.h>
#include <poll.h>
#define USE_TERMIOS
#define HAVE_UNISTD_H
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#include <assert.h>
#include <errno.h>
#include <string.h>
#include <signal.h>
#include <stdlib.h>
#include <sys/types.h>
#if defined(_WIN32) && !defined(__MINGW32__)
/* Microsoft headers don't like old POSIX names */
#define strdup _strdup
#define snprintf _snprintf
#endif
#include "linenoise.h"
#ifndef STRINGBUF_H
#include "stringbuf.h"
#endif
#ifndef UTF8_UTIL_H
#include "utf8.h"
#endif
#define LINENOISE_DEFAULT_HISTORY_MAX_LEN 100
/* ctrl('A') -> 0x01 */
#define ctrl(C) ((C) - '@')
/* meta('a') -> 0xe1 */
#define meta(C) ((C) | 0x80)
/* Use -ve numbers here to co-exist with normal unicode chars */
enum {
SPECIAL_NONE,
/* don't use -1 here since that indicates error */
SPECIAL_UP = -20,
SPECIAL_DOWN = -21,
SPECIAL_LEFT = -22,
SPECIAL_RIGHT = -23,
SPECIAL_DELETE = -24,
SPECIAL_HOME = -25,
SPECIAL_END = -26,
SPECIAL_INSERT = -27,
SPECIAL_PAGE_UP = -28,
SPECIAL_PAGE_DOWN = -29,
/* Some handy names for other special keycodes */
CHAR_ESCAPE = 27,
CHAR_DELETE = 127,
};
static int history_max_len = LINENOISE_DEFAULT_HISTORY_MAX_LEN;
static int history_len = 0;
static char **history = NULL;
/* Structure to contain the status of the current (being edited) line */
struct current {
stringbuf *buf; /* Current buffer. Always null terminated */
int pos; /* Cursor position, measured in chars */
int cols; /* Size of the window, in chars */
int nrows; /* How many rows are being used in multiline mode (>= 1) */
int rpos; /* The current row containing the cursor - multiline mode only */
int colsright; /* refreshLine() cached cols for insert_char() optimisation */
int colsleft; /* refreshLine() cached cols for remove_char() optimisation */
const char *prompt;
stringbuf *capture; /* capture buffer, or NULL for none. Always null terminated */
stringbuf *output; /* used only during refreshLine() - output accumulator */
#if defined(USE_TERMIOS)
int fd; /* Terminal fd */
#elif defined(USE_WINCONSOLE)
HANDLE outh; /* Console output handle */
HANDLE inh; /* Console input handle */
int rows; /* Screen rows */
int x; /* Current column during output */
int y; /* Current row */
#ifdef USE_UTF8
#define UBUF_MAX_CHARS 132
WORD ubuf[UBUF_MAX_CHARS + 1]; /* Accumulates utf16 output - one extra for final surrogate pairs */
int ubuflen; /* length used in ubuf */
int ubufcols; /* how many columns are represented by the chars in ubuf? */
#endif
#endif
};
static int fd_read(struct current *current);
static int getWindowSize(struct current *current);
static void cursorDown(struct current *current, int n);
static void cursorUp(struct current *current, int n);
static void eraseEol(struct current *current);
static void refreshLine(struct current *current);
static void refreshLineAlt(struct current *current, const char *prompt, const char *buf, int cursor_pos);
static void setCursorPos(struct current *current, int x);
static void setOutputHighlight(struct current *current, const int *props, int nprops);
static void set_current(struct current *current, const char *str);
static int fd_isatty(struct current *current)
{
#ifdef USE_TERMIOS
return isatty(current->fd);
#else
(void)current;
return 0;
#endif
}
void linenoiseHistoryFree(void) {
if (history) {
int j;
for (j = 0; j < history_len; j++)
free(history[j]);
free(history);
history = NULL;
history_len = 0;
}
}
typedef enum {
EP_START, /* looking for ESC */
EP_ESC, /* looking for [ */
EP_DIGITS, /* parsing digits */
EP_PROPS, /* parsing digits or semicolons */
EP_END, /* ok */
EP_ERROR, /* error */
} ep_state_t;
struct esc_parser {
ep_state_t state;
int props[5]; /* properties are stored here */
int maxprops; /* size of the props[] array */
int numprops; /* number of properties found */
int termchar; /* terminator char, or 0 for any alpha */
int current; /* current (partial) property value */
};
/**
* Initialise the escape sequence parser at *parser.
*
* If termchar is 0 any alpha char terminates ok. Otherwise only the given
* char terminates successfully.
* Run the parser state machine with calls to parseEscapeSequence() for each char.
*/
static void initParseEscapeSeq(struct esc_parser *parser, int termchar)
{
parser->state = EP_START;
parser->maxprops = sizeof(parser->props) / sizeof(*parser->props);
parser->numprops = 0;
parser->current = 0;
parser->termchar = termchar;
}
/**
* Pass character 'ch' into the state machine to parse:
* 'ESC' '[' <digits> (';' <digits>)* <termchar>
*
* The first character must be ESC.
* Returns the current state. The state machine is done when it returns either EP_END
* or EP_ERROR.
*
* On EP_END, the "property/attribute" values can be read from parser->props[]
* of length parser->numprops.
*/
static int parseEscapeSequence(struct esc_parser *parser, int ch)
{
switch (parser->state) {
case EP_START:
parser->state = (ch == '\x1b') ? EP_ESC : EP_ERROR;
break;
case EP_ESC:
parser->state = (ch == '[') ? EP_DIGITS : EP_ERROR;
break;
case EP_PROPS:
if (ch == ';') {
parser->state = EP_DIGITS;
donedigits:
if (parser->numprops + 1 < parser->maxprops) {
parser->props[parser->numprops++] = parser->current;
parser->current = 0;
}
break;
}
/* fall through */
case EP_DIGITS:
if (ch >= '0' && ch <= '9') {
parser->current = parser->current * 10 + (ch - '0');
parser->state = EP_PROPS;
break;
}
/* must be terminator */
if (parser->termchar != ch) {
if (parser->termchar != 0 || !((ch >= 'A' && ch <= 'Z') || (ch >= 'a' && ch <= 'z'))) {
parser->state = EP_ERROR;
break;
}
}
parser->state = EP_END;
goto donedigits;
case EP_END:
parser->state = EP_ERROR;
break;
case EP_ERROR:
break;
}
return parser->state;
}
/*#define DEBUG_REFRESHLINE*/
#ifdef DEBUG_REFRESHLINE
#define DRL(ARGS...) fprintf(dfh, ARGS)
static FILE *dfh;
static void DRL_CHAR(int ch)
{
if (ch < ' ') {
DRL("^%c", ch + '@');
}
else if (ch > 127) {
DRL("\\u%04x", ch);
}
else {
DRL("%c", ch);
}
}
static void DRL_STR(const char *str)
{
while (*str) {
int ch;
int n = utf8_tounicode(str, &ch);
str += n;
DRL_CHAR(ch);
}
}
#else
#define DRL(...)
#define DRL_CHAR(ch)
#define DRL_STR(str)
#endif
#if defined(USE_WINCONSOLE)
#include "linenoise-win32.c"
#endif
#if defined(USE_TERMIOS)
static void linenoiseAtExit(void);
static struct termios orig_termios; /* in order to restore at exit */
static int rawmode = 0; /* for atexit() function to check if restore is needed*/
static int atexit_registered = 0; /* register atexit just 1 time */
static const char *unsupported_term[] = {"dumb","cons25","emacs",NULL};
static int isUnsupportedTerm(void) {
char *term = getenv("TERM");
if (term) {
int j;
for (j = 0; unsupported_term[j]; j++) {
if (strcmp(term, unsupported_term[j]) == 0) {
return 1;
}
}
}
return 0;
}
static int enableRawMode(struct current *current) {
struct termios raw;
current->fd = STDIN_FILENO;
current->cols = 0;
if (!isatty(current->fd) || isUnsupportedTerm() ||
tcgetattr(current->fd, &orig_termios) == -1) {
fatal:
errno = ENOTTY;
return -1;
}
if (!atexit_registered) {
atexit(linenoiseAtExit);
atexit_registered = 1;
}
raw = orig_termios; /* modify the original mode */
/* input modes: no break, no CR to NL, no parity check, no strip char,
* no start/stop output control. */
raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
/* output modes - actually, no need to disable post processing */
/*raw.c_oflag &= ~(OPOST);*/
/* control modes - set 8 bit chars */
raw.c_cflag |= (CS8);
/* local modes - choing off, canonical off, no extended functions,
* no signal chars (^Z,^C) */
raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
/* control chars - set return condition: min number of bytes and timer.
* We want read to return every single byte, without timeout. */
raw.c_cc[VMIN] = 1; raw.c_cc[VTIME] = 0; /* 1 byte, no timer */
/* put terminal in raw mode after flushing */
if (tcsetattr(current->fd,TCSADRAIN,&raw) < 0) {
goto fatal;
}
rawmode = 1;
return 0;
}
static void disableRawMode(struct current *current) {
/* Don't even check the return value as it's too late. */
if (rawmode && tcsetattr(current->fd,TCSADRAIN,&orig_termios) != -1)
rawmode = 0;
}
/* At exit we'll try to fix the terminal to the initial conditions. */
static void linenoiseAtExit(void) {
if (rawmode) {
tcsetattr(STDIN_FILENO, TCSADRAIN, &orig_termios);
}
linenoiseHistoryFree();
}
/* gcc/glibc insists that we care about the return code of write!
* Clarification: This means that a void-cast like "(void) (EXPR)"
* does not work.
*/
#define IGNORE_RC(EXPR) if (EXPR) {}
/**
* Output bytes directly, or accumulate output (if current->output is set)
*/
static void outputChars(struct current *current, const char *buf, int len)
{
if (len < 0) {
len = strlen(buf);
}
if (current->output) {
sb_append_len(current->output, buf, len);
}
else {
IGNORE_RC(write(current->fd, buf, len));
}
}
/* Like outputChars, but using printf-style formatting
*/
static void outputFormatted(struct current *current, const char *format, ...)
{
va_list args;
char buf[64];
int n;
va_start(args, format);
n = vsnprintf(buf, sizeof(buf), format, args);
/* This will never happen because we are sure to use outputFormatted() only for short sequences */
assert(n < (int)sizeof(buf));
va_end(args);
outputChars(current, buf, n);
}
static void cursorToLeft(struct current *current)
{
outputChars(current, "\r", -1);
}
static void setOutputHighlight(struct current *current, const int *props, int nprops)
{
outputChars(current, "\x1b[", -1);
while (nprops--) {
outputFormatted(current, "%d%c", *props, (nprops == 0) ? 'm' : ';');
props++;
}
}
static void eraseEol(struct current *current)
{
outputChars(current, "\x1b[0K", -1);
}
static void setCursorPos(struct current *current, int x)
{
if (x == 0) {
cursorToLeft(current);
}
else {
outputFormatted(current, "\r\x1b[%dC", x);
}
}
static void cursorUp(struct current *current, int n)
{
if (n) {
outputFormatted(current, "\x1b[%dA", n);
}
}
static void cursorDown(struct current *current, int n)
{
if (n) {
outputFormatted(current, "\x1b[%dB", n);
}
}
void linenoiseClearScreen(void)
{
IGNORE_RC(write(STDOUT_FILENO, "\x1b[H\x1b[2J", 7));
}
/**
* Reads a char from 'fd', waiting at most 'timeout' milliseconds.
*
* A timeout of -1 means to wait forever.
*
* Returns -1 if no char is received within the time or an error occurs.
*/
static int fd_read_char(int fd, int timeout)
{
struct pollfd p;
unsigned char c;
p.fd = fd;
p.events = POLLIN;
if (poll(&p, 1, timeout) == 0) {
/* timeout */
return -1;
}
if (read(fd, &c, 1) != 1) {
return -1;
}
return c;
}
/**
* Reads a complete utf-8 character
* and returns the unicode value, or -1 on error.
*/
static int fd_read(struct current *current)
{
#ifdef USE_UTF8
char buf[MAX_UTF8_LEN];
int n;
int i;
int c;
if (read(current->fd, &buf[0], 1) != 1) {
return -1;
}
n = utf8_charlen(buf[0]);
if (n < 1) {
return -1;
}
for (i = 1; i < n; i++) {
if (read(current->fd, &buf[i], 1) != 1) {
return -1;
}
}
/* decode and return the character */
utf8_tounicode(buf, &c);
return c;
#else
return fd_read_char(current->fd, -1);
#endif
}
/**
* Stores the current cursor column in '*cols'.
* Returns 1 if OK, or 0 if failed to determine cursor pos.
*/
static int queryCursor(struct current *current, int* cols)
{
struct esc_parser parser;
int ch;
/* Should not be buffering this output, it needs to go immediately */
assert(current->output == NULL);
/* control sequence - report cursor location */
outputChars(current, "\x1b[6n", -1);
/* Parse the response: ESC [ rows ; cols R */
initParseEscapeSeq(&parser, 'R');
while ((ch = fd_read_char(current->fd, 100)) > 0) {
switch (parseEscapeSequence(&parser, ch)) {
default:
continue;
case EP_END:
if (parser.numprops == 2 && parser.props[1] < 1000) {
*cols = parser.props[1];
return 1;
}
break;
case EP_ERROR:
break;
}
/* failed */
break;
}
return 0;
}
/**
* Updates current->cols with the current window size (width)
*/
static int getWindowSize(struct current *current)
{
struct winsize ws;
if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == 0 && ws.ws_col != 0) {
current->cols = ws.ws_col;
return 0;
}
/* Failed to query the window size. Perhaps we are on a serial terminal.
* Try to query the width by sending the cursor as far to the right
* and reading back the cursor position.
* Note that this is only done once per call to linenoise rather than
* every time the line is refreshed for efficiency reasons.
*
* In more detail, we:
* (a) request current cursor position,
* (b) move cursor far right,
* (c) request cursor position again,
* (d) at last move back to the old position.
* This gives us the width without messing with the externally
* visible cursor position.
*/
if (current->cols == 0) {
int here;
/* If anything fails => default 80 */
current->cols = 80;
/* (a) */
if (queryCursor (current, &here)) {
/* (b) */
setCursorPos(current, 999);
/* (c). Note: If (a) succeeded, then (c) should as well.
* For paranoia we still check and have a fallback action
* for (d) in case of failure..
*/
if (queryCursor (current, &current->cols)) {
/* (d) Reset the cursor back to the original location. */
if (current->cols > here) {
setCursorPos(current, here);
}
}
}
}
return 0;
}
/**
* If CHAR_ESCAPE was received, reads subsequent
* chars to determine if this is a known special key.
*
* Returns SPECIAL_NONE if unrecognised, or -1 if EOF.
*
* If no additional char is received within a short time,
* CHAR_ESCAPE is returned.
*/
static int check_special(int fd)
{
int c = fd_read_char(fd, 50);
int c2;
if (c < 0) {
return CHAR_ESCAPE;
}
else if (c >= 'a' && c <= 'z') {
/* esc-a => meta-a */
return meta(c);
}
c2 = fd_read_char(fd, 50);
if (c2 < 0) {
return c2;
}
if (c == '[' || c == 'O') {
/* Potential arrow key */
switch (c2) {
case 'A':
return SPECIAL_UP;
case 'B':
return SPECIAL_DOWN;
case 'C':
return SPECIAL_RIGHT;
case 'D':
return SPECIAL_LEFT;
case 'F':
return SPECIAL_END;
case 'H':
return SPECIAL_HOME;
}
}
if (c == '[' && c2 >= '1' && c2 <= '8') {
/* extended escape */
c = fd_read_char(fd, 50);
if (c == '~') {
switch (c2) {
case '2':
return SPECIAL_INSERT;
case '3':
return SPECIAL_DELETE;
case '5':
return SPECIAL_PAGE_UP;
case '6':
return SPECIAL_PAGE_DOWN;
case '7':
return SPECIAL_HOME;
case '8':
return SPECIAL_END;
}
}
while (c != -1 && c != '~') {
/* .e.g \e[12~ or '\e[11;2~ discard the complete sequence */
c = fd_read_char(fd, 50);
}
}
return SPECIAL_NONE;
}
#endif
static void clearOutputHighlight(struct current *current)
{
int nohighlight = 0;
setOutputHighlight(current, &nohighlight, 1);
}
static void outputControlChar(struct current *current, char ch)
{
int reverse = 7;
setOutputHighlight(current, &reverse, 1);
outputChars(current, "^", 1);
outputChars(current, &ch, 1);
clearOutputHighlight(current);
}
#ifndef utf8_getchars
static int utf8_getchars(char *buf, int c)
{
#ifdef USE_UTF8
return utf8_fromunicode(buf, c);
#else
*buf = c;
return 1;
#endif
}
#endif
/**
* Returns the unicode character at the given offset,
* or -1 if none.
*/
static int get_char(struct current *current, int pos)
{
if (pos >= 0 && pos < sb_chars(current->buf)) {
int c;
int i = utf8_index(sb_str(current->buf), pos);
(void)utf8_tounicode(sb_str(current->buf) + i, &c);
return c;
}
return -1;
}
static int char_display_width(int ch)
{
if (ch < ' ') {
/* control chars take two positions */
return 2;
}
else {
return utf8_width(ch);
}
}
#ifndef NO_COMPLETION
static linenoiseCompletionCallback *completionCallback = NULL;
static void *completionUserdata = NULL;
static int showhints = 1;
static linenoiseHintsCallback *hintsCallback = NULL;
static linenoiseFreeHintsCallback *freeHintsCallback = NULL;
static void *hintsUserdata = NULL;
static void beep(void) {
#ifdef USE_TERMIOS
fprintf(stderr, "\x7");
fflush(stderr);
#endif
}
static void freeCompletions(linenoiseCompletions *lc) {
size_t i;
for (i = 0; i < lc->len; i++)
free(lc->cvec[i]);
free(lc->cvec);
}
static int completeLine(struct current *current) {
linenoiseCompletions lc = { 0, NULL };
int c = 0;
completionCallback(sb_str(current->buf),&lc,completionUserdata);
if (lc.len == 0) {
beep();
} else {
size_t stop = 0, i = 0;
while(!stop) {
/* Show completion or original buffer */
if (i < lc.len) {
int chars = utf8_strlen(lc.cvec[i], -1);
refreshLineAlt(current, current->prompt, lc.cvec[i], chars);
} else {
refreshLine(current);
}
c = fd_read(current);
if (c == -1) {
break;
}
switch(c) {
case '\t': /* tab */
i = (i+1) % (lc.len+1);
if (i == lc.len) beep();
break;
case CHAR_ESCAPE: /* escape */
/* Re-show original buffer */
if (i < lc.len) {
refreshLine(current);
}
stop = 1;
break;
default:
/* Update buffer and return */
if (i < lc.len) {
set_current(current,lc.cvec[i]);
}
stop = 1;
break;
}
}
}
freeCompletions(&lc);
return c; /* Return last read character */
}
/* Register a callback function to be called for tab-completion.
Returns the prior callback so that the caller may (if needed)
restore it when done. */
linenoiseCompletionCallback * linenoiseSetCompletionCallback(linenoiseCompletionCallback *fn, void *userdata) {
linenoiseCompletionCallback * old = completionCallback;
completionCallback = fn;
completionUserdata = userdata;
return old;
}
void linenoiseAddCompletion(linenoiseCompletions *lc, const char *str) {
lc->cvec = (char **)realloc(lc->cvec,sizeof(char*)*(lc->len+1));
lc->cvec[lc->len++] = strdup(str);
}
void linenoiseSetHintsCallback(linenoiseHintsCallback *callback, void *userdata)
{
hintsCallback = callback;
hintsUserdata = userdata;
}
void linenoiseSetFreeHintsCallback(linenoiseFreeHintsCallback *callback)
{
freeHintsCallback = callback;
}
#endif
static const char *reduceSingleBuf(const char *buf, int availcols, int *cursor_pos)
{
/* We have availcols columns available.
* If necessary, strip chars off the front of buf until *cursor_pos
* fits within availcols
*/
int needcols = 0;
int pos = 0;
int new_cursor_pos = *cursor_pos;
const char *pt = buf;
DRL("reduceSingleBuf: availcols=%d, cursor_pos=%d\n", availcols, *cursor_pos);
while (*pt) {
int ch;
int n = utf8_tounicode(pt, &ch);
pt += n;
needcols += char_display_width(ch);
/* If we need too many cols, strip
* chars off the front of buf to make it fit.
* We keep 3 extra cols to the right of the cursor.
* 2 for possible wide chars, 1 for the last column that
* can't be used.
*/
while (needcols >= availcols - 3) {
n = utf8_tounicode(buf, &ch);
buf += n;
needcols -= char_display_width(ch);
DRL_CHAR(ch);
/* and adjust the apparent cursor position */
new_cursor_pos--;
if (buf == pt) {
/* can't remove more than this */
break;
}
}
if (pos++ == *cursor_pos) {
break;
}
}
DRL("<snip>");
DRL_STR(buf);
DRL("\nafter reduce, needcols=%d, new_cursor_pos=%d\n", needcols, new_cursor_pos);
/* Done, now new_cursor_pos contains the adjusted cursor position
* and buf points to he adjusted start
*/
*cursor_pos = new_cursor_pos;
return buf;
}
static int mlmode = 0;
void linenoiseSetMultiLine(int enableml)
{
mlmode = enableml;
}
/* Helper of refreshSingleLine() and refreshMultiLine() to show hints
* to the right of the prompt.
* Returns 1 if a hint was shown, or 0 if not
* If 'display' is 0, does no output. Just returns the appropriate return code.
*/
static int refreshShowHints(struct current *current, const char *buf, int availcols, int display)
{
int rc = 0;
if (showhints && hintsCallback && availcols > 0) {
int bold = 0;
int color = -1;
char *hint = hintsCallback(buf, &color, &bold, hintsUserdata);
if (hint) {
rc = 1;
if (display) {
const char *pt;
if (bold == 1 && color == -1) color = 37;
if (bold || color > 0) {
int props[3] = { bold, color, 49 }; /* bold, color, fgnormal */
setOutputHighlight(current, props, 3);
}
DRL("<hint bold=%d,color=%d>", bold, color);
pt = hint;
while (*pt) {
int ch;
int n = utf8_tounicode(pt, &ch);
int width = char_display_width(ch);
if (width >= availcols) {
DRL("<hinteol>");
break;
}
DRL_CHAR(ch);
availcols -= width;
outputChars(current, pt, n);
pt += n;
}
if (bold || color > 0) {
clearOutputHighlight(current);
}
/* Call the function to free the hint returned. */
if (freeHintsCallback) freeHintsCallback(hint, hintsUserdata);
}
}
}
return rc;
}
#ifdef USE_TERMIOS
static void refreshStart(struct current *current)
{
/* We accumulate all output here */
assert(current->output == NULL);
current->output = sb_alloc();
}
static void refreshEnd(struct current *current)
{
/* Output everything at once */
IGNORE_RC(write(current->fd, sb_str(current->output), sb_len(current->output)));
sb_free(current->output);
current->output = NULL;
}
static void refreshStartChars(struct current *current)
{
(void)current;
}
static void refreshNewline(struct current *current)
{
DRL("<nl>");
outputChars(current, "\n", 1);
}
static void refreshEndChars(struct current *current)
{
(void)current;
}
#endif
static void refreshLineAlt(struct current *current, const char *prompt, const char *buf, int cursor_pos)
{
int i;
const char *pt;
int displaycol;
int displayrow;
int visible;
int currentpos;
int notecursor;
int cursorcol = 0;
int cursorrow = 0;
int hint;
struct esc_parser parser;
#ifdef DEBUG_REFRESHLINE
dfh = fopen("linenoise.debuglog", "a");
#endif
/* Should intercept SIGWINCH. For now, just get the size every time */
getWindowSize(current);
refreshStart(current);
DRL("wincols=%d, cursor_pos=%d, nrows=%d, rpos=%d\n", current->cols, cursor_pos, current->nrows, current->rpos);
/* Here is the plan:
* (a) move the the bottom row, going down the appropriate number of lines
* (b) move to beginning of line and erase the current line
* (c) go up one line and do the same, until we have erased up to the first row
* (d) output the prompt, counting cols and rows, taking into account escape sequences
* (e) output the buffer, counting cols and rows
* (e') when we hit the current pos, save the cursor position
* (f) move the cursor to the saved cursor position
* (g) save the current cursor row and number of rows
*/
/* (a) - The cursor is currently at row rpos */
cursorDown(current, current->nrows - current->rpos - 1);
DRL("<cud=%d>", current->nrows - current->rpos - 1);
/* (b), (c) - Erase lines upwards until we get to the first row */
for (i = 0; i < current->nrows; i++) {
if (i) {
DRL("<cup>");
cursorUp(current, 1);
}
DRL("<clearline>");
cursorToLeft(current);
eraseEol(current);
}
DRL("\n");
/* (d) First output the prompt. control sequences don't take up display space */
pt = prompt;
displaycol = 0; /* current display column */
displayrow = 0; /* current display row */
visible = 1;
refreshStartChars(current);
while (*pt) {
int width;
int ch;
int n = utf8_tounicode(pt, &ch);
if (visible && ch == CHAR_ESCAPE) {
/* The start of an escape sequence, so not visible */
visible = 0;
initParseEscapeSeq(&parser, 'm');
DRL("<esc-seq-start>");
}
if (ch == '\n' || ch == '\r') {
/* treat both CR and NL the same and force wrap */
refreshNewline(current);
displaycol = 0;
displayrow++;
}
else {
width = visible * utf8_width(ch);
displaycol += width;
if (displaycol >= current->cols) {
/* need to wrap to the next line because of newline or if it doesn't fit
* XXX this is a problem in single line mode
*/
refreshNewline(current);
displaycol = width;
displayrow++;
}
DRL_CHAR(ch);
#ifdef USE_WINCONSOLE
if (visible) {
outputChars(current, pt, n);
}
#else
outputChars(current, pt, n);
#endif
}
pt += n;
if (!visible) {
switch (parseEscapeSequence(&parser, ch)) {
case EP_END:
visible = 1;
setOutputHighlight(current, parser.props, parser.numprops);
DRL("<esc-seq-end,numprops=%d>", parser.numprops);
break;
case EP_ERROR:
DRL("<esc-seq-err>");
visible = 1;
break;
}
}
}
/* Now we are at the first line with all lines erased */
DRL("\nafter prompt: displaycol=%d, displayrow=%d\n", displaycol, displayrow);
/* (e) output the buffer, counting cols and rows */
if (mlmode == 0) {
/* In this mode we may need to trim chars from the start of the buffer until the
* cursor fits in the window.
*/
pt = reduceSingleBuf(buf, current->cols - displaycol, &cursor_pos);
}
else {
pt = buf;
}
currentpos = 0;
notecursor = -1;
while (*pt) {
int ch;
int n = utf8_tounicode(pt, &ch);
int width = char_display_width(ch);
if (currentpos == cursor_pos) {
/* (e') wherever we output this character is where we want the cursor */
notecursor = 1;
}
if (displaycol + width >= current->cols) {
if (mlmode == 0) {
/* In single line mode stop once we print as much as we can on one line */
DRL("<slmode>");
break;
}
/* need to wrap to the next line since it doesn't fit */
refreshNewline(current);
displaycol = 0;
displayrow++;
}
if (notecursor == 1) {
/* (e') Save this position as the current cursor position */
cursorcol = displaycol;
cursorrow = displayrow;
notecursor = 0;
DRL("<cursor>");
}
displaycol += width;
if (ch < ' ') {
outputControlChar(current, ch + '@');
}
else {
outputChars(current, pt, n);
}
DRL_CHAR(ch);
if (width != 1) {
DRL("<w=%d>", width);
}
pt += n;
currentpos++;
}
/* If we didn't see the cursor, it is at the current location */
if (notecursor) {
DRL("<cursor>");
cursorcol = displaycol;
cursorrow = displayrow;
}
DRL("\nafter buf: displaycol=%d, displayrow=%d, cursorcol=%d, cursorrow=%d\n", displaycol, displayrow, cursorcol, cursorrow);
/* (f) show hints */
hint = refreshShowHints(current, buf, current->cols - displaycol, 1);
/* Remember how many many cols are available for insert optimisation */
if (prompt == current->prompt && hint == 0) {
current->colsright = current->cols - displaycol;
current->colsleft = displaycol;
}
else {
/* Can't optimise */
current->colsright = 0;
current->colsleft = 0;
}
DRL("\nafter hints: colsleft=%d, colsright=%d\n\n", current->colsleft, current->colsright);
refreshEndChars(current);
/* (g) move the cursor to the correct place */
cursorUp(current, displayrow - cursorrow);
setCursorPos(current, cursorcol);
/* (h) Update the number of rows if larger, but never reduce this */
if (displayrow >= current->nrows) {
current->nrows = displayrow + 1;
}
/* And remember the row that the cursor is on */
current->rpos = cursorrow;
refreshEnd(current);
#ifdef DEBUG_REFRESHLINE
fclose(dfh);
#endif
}
static void refreshLine(struct current *current)
{
refreshLineAlt(current, current->prompt, sb_str(current->buf), current->pos);
}
static void set_current(struct current *current, const char *str)
{
sb_clear(current->buf);
sb_append(current->buf, str);
current->pos = sb_chars(current->buf);
}
/**
* Removes the char at 'pos'.
*
* Returns 1 if the line needs to be refreshed, 2 if not
* and 0 if nothing was removed
*/
static int remove_char(struct current *current, int pos)
{
if (pos >= 0 && pos < sb_chars(current->buf)) {
int offset = utf8_index(sb_str(current->buf), pos);
int nbytes = utf8_index(sb_str(current->buf) + offset, 1);
int rc = 1;
/* Now we try to optimise in the simple but very common case that:
* - outputChars() can be used directly (not win32)
* - we are removing the char at EOL
* - the buffer is not empty
* - there are columns available to the left
* - the char being deleted is not a wide or utf-8 character
* - no hints are being shown
*/
if (current->output && current->pos == pos + 1 && current->pos == sb_chars(current->buf) && pos > 0) {
#ifdef USE_UTF8
/* Could implement utf8_prev_len() but simplest just to not optimise this case */
char last = sb_str(current->buf)[offset];
#else
char last = 0;
#endif
if (current->colsleft > 0 && (last & 0x80) == 0) {
/* Have cols on the left and not a UTF-8 char or continuation */
/* Yes, can optimise */
current->colsleft--;
current->colsright++;
rc = 2;
}
}
sb_delete(current->buf, offset, nbytes);
if (current->pos > pos) {
current->pos--;
}
if (rc == 2) {
if (refreshShowHints(current, sb_str(current->buf), current->colsright, 0)) {
/* A hint needs to be shown, so can't optimise after all */
rc = 1;
}
else {
/* optimised output */
outputChars(current, "\b \b", 3);
}
}
return rc;
return 1;
}
return 0;
}
/**
* Insert 'ch' at position 'pos'
*
* Returns 1 if the line needs to be refreshed, 2 if not
* and 0 if nothing was inserted (no room)
*/
static int insert_char(struct current *current, int pos, int ch)
{
if (pos >= 0 && pos <= sb_chars(current->buf)) {
char buf[MAX_UTF8_LEN + 1];
int offset = utf8_index(sb_str(current->buf), pos);
int n = utf8_getchars(buf, ch);
int rc = 1;
/* null terminate since sb_insert() requires it */
buf[n] = 0;
/* Now we try to optimise in the simple but very common case that:
* - outputChars() can be used directly (not win32)
* - we are inserting at EOL
* - there are enough columns available
* - no hints are being shown
*/
if (current->output && pos == current->pos && pos == sb_chars(current->buf)) {
int width = char_display_width(ch);
if (current->colsright > width) {
/* Yes, can optimise */
current->colsright -= width;
current->colsleft -= width;
rc = 2;
}
}
sb_insert(current->buf, offset, buf);
if (current->pos >= pos) {
current->pos++;
}
if (rc == 2) {
if (refreshShowHints(current, sb_str(current->buf), current->colsright, 0)) {
/* A hint needs to be shown, so can't optimise after all */
rc = 1;
}
else {
/* optimised output */
outputChars(current, buf, n);
}
}
return rc;
}
return 0;
}
/**
* Captures up to 'n' characters starting at 'pos' for the cut buffer.
*
* This replaces any existing characters in the cut buffer.
*/
static void capture_chars(struct current *current, int pos, int nchars)
{
if (pos >= 0 && (pos + nchars - 1) < sb_chars(current->buf)) {
int offset = utf8_index(sb_str(current->buf), pos);
int nbytes = utf8_index(sb_str(current->buf) + offset, nchars);
if (nbytes > 0) {
if (current->capture) {
sb_clear(current->capture);
}
else {
current->capture = sb_alloc();
}
sb_append_len(current->capture, sb_str(current->buf) + offset, nbytes);
}
}
}
/**
* Removes up to 'n' characters at cursor position 'pos'.
*
* Returns 0 if no chars were removed or non-zero otherwise.
*/
static int remove_chars(struct current *current, int pos, int n)
{
int removed = 0;
/* First save any chars which will be removed */
capture_chars(current, pos, n);
while (n-- && remove_char(current, pos)) {
removed++;
}
return removed;
}
/**
* Inserts the characters (string) 'chars' at the cursor position 'pos'.
*
* Returns 0 if no chars were inserted or non-zero otherwise.
*/
static int insert_chars(struct current *current, int pos, const char *chars)
{
int inserted = 0;
while (*chars) {
int ch;
int n = utf8_tounicode(chars, &ch);
if (insert_char(current, pos, ch) == 0) {
break;
}
inserted++;
pos++;
chars += n;
}
return inserted;
}
static int skip_space_nonspace(struct current *current, int dir, int check_is_space)
{
int moved = 0;
int checkoffset = (dir < 0) ? -1 : 0;
int limit = (dir < 0) ? 0 : sb_chars(current->buf);
while (current->pos != limit && (get_char(current, current->pos + checkoffset) == ' ') == check_is_space) {
current->pos += dir;
moved++;
}
return moved;
}
static int skip_space(struct current *current, int dir)
{
return skip_space_nonspace(current, dir, 1);
}
static int skip_nonspace(struct current *current, int dir)
{
return skip_space_nonspace(current, dir, 0);
}
/**
* Returns the keycode to process, or 0 if none.
*/
static int reverseIncrementalSearch(struct current *current)
{
/* Display the reverse-i-search prompt and process chars */
char rbuf[50];
char rprompt[80];
int rchars = 0;
int rlen = 0;
int searchpos = history_len - 1;
int c;
rbuf[0] = 0;
while (1) {
int n = 0;
const char *p = NULL;
int skipsame = 0;
int searchdir = -1;
snprintf(rprompt, sizeof(rprompt), "(reverse-i-search)'%s': ", rbuf);
refreshLineAlt(current, rprompt, sb_str(current->buf), current->pos);
c = fd_read(current);
if (c == ctrl('H') || c == CHAR_DELETE) {
if (rchars) {
int p_ind = utf8_index(rbuf, --rchars);
rbuf[p_ind] = 0;
rlen = strlen(rbuf);
}
continue;
}
#ifdef USE_TERMIOS
if (c == CHAR_ESCAPE) {
c = check_special(current->fd);
}
#endif
if (c == ctrl('P') || c == SPECIAL_UP) {
/* Search for the previous (earlier) match */
if (searchpos > 0) {
searchpos--;
}
skipsame = 1;
}
else if (c == ctrl('N') || c == SPECIAL_DOWN) {
/* Search for the next (later) match */
if (searchpos < history_len) {
searchpos++;
}
searchdir = 1;
skipsame = 1;
}
else if (c >= ' ' && c <= '~') {
/* >= here to allow for null terminator */
if (rlen >= (int)sizeof(rbuf) - MAX_UTF8_LEN) {
continue;
}
n = utf8_getchars(rbuf + rlen, c);
rlen += n;
rchars++;
rbuf[rlen] = 0;
/* Adding a new char resets the search location */
searchpos = history_len - 1;
}
else {
/* Exit from incremental search mode */
break;
}
/* Now search through the history for a match */
for (; searchpos >= 0 && searchpos < history_len; searchpos += searchdir) {
p = strstr(history[searchpos], rbuf);
if (p) {
/* Found a match */
if (skipsame && strcmp(history[searchpos], sb_str(current->buf)) == 0) {
/* But it is identical, so skip it */
continue;
}
/* Copy the matching line and set the cursor position */
set_current(current,history[searchpos]);
current->pos = utf8_strlen(history[searchpos], p - history[searchpos]);
break;
}
}
if (!p && n) {
/* No match, so don't add it */
rchars--;
rlen -= n;
rbuf[rlen] = 0;
}
}
if (c == ctrl('G') || c == ctrl('C')) {
/* ctrl-g terminates the search with no effect */
set_current(current, "");
c = 0;
}
else if (c == ctrl('J')) {
/* ctrl-j terminates the search leaving the buffer in place */
c = 0;
}
/* Go process the char normally */
refreshLine(current);
return c;
}
static int linenoiseEdit(struct current *current) {
int history_index = 0;
refreshLine(current);
while(1) {
int dir = -1;
int c = fd_read(current);
#ifndef NO_COMPLETION
/* Only autocomplete when the callback is set. It returns < 0 when
* there was an error reading from fd. Otherwise it will return the
* character that should be handled next. */
if (c == '\t' && current->pos == sb_chars(current->buf) && completionCallback != NULL) {
c = completeLine(current);
}
#endif
if (c == ctrl('R')) {
/* reverse incremental search will provide an alternative keycode or 0 for none */
c = reverseIncrementalSearch(current);
/* go on to process the returned char normally */
}
#ifdef USE_TERMIOS
if (c == CHAR_ESCAPE) { /* escape sequence */
c = check_special(current->fd);
}
#endif
if (c == -1) {
/* Return on errors */
return sb_len(current->buf);
}
switch(c) {
case SPECIAL_NONE:
break;
case '\r': /* enter/CR */
case '\n': /* LF */
history_len--;
free(history[history_len]);
current->pos = sb_chars(current->buf);
if (mlmode || hintsCallback) {
showhints = 0;
refreshLine(current);
showhints = 1;
}
return sb_len(current->buf);
case ctrl('C'): /* ctrl-c */
errno = EAGAIN;
return -1;
case ctrl('Z'): /* ctrl-z */
#ifdef SIGTSTP
/* send ourselves SIGSUSP */
disableRawMode(current);
raise(SIGTSTP);
/* and resume */
enableRawMode(current);
refreshLine(current);
#endif
continue;
case CHAR_DELETE: /* backspace */
case ctrl('H'):
if (remove_char(current, current->pos - 1) == 1) {
refreshLine(current);
}
break;
case ctrl('D'): /* ctrl-d */
if (sb_len(current->buf) == 0) {
/* Empty line, so EOF */
history_len--;
free(history[history_len]);
return -1;
}
/* Otherwise fall through to delete char to right of cursor */
/* fall-thru */
case SPECIAL_DELETE:
if (remove_char(current, current->pos) == 1) {
refreshLine(current);
}
break;
case SPECIAL_INSERT:
/* Ignore. Expansion Hook.
* Future possibility: Toggle Insert/Overwrite Modes
*/
break;
case meta('b'): /* meta-b, move word left */
if (skip_nonspace(current, -1)) {
refreshLine(current);
}
else if (skip_space(current, -1)) {
skip_nonspace(current, -1);
refreshLine(current);
}
break;
case meta('f'): /* meta-f, move word right */
if (skip_space(current, 1)) {
refreshLine(current);
}
else if (skip_nonspace(current, 1)) {
skip_space(current, 1);
refreshLine(current);
}
break;
case ctrl('W'): /* ctrl-w, delete word at left. save deleted chars */
/* eat any spaces on the left */
{
int pos = current->pos;
while (pos > 0 && get_char(current, pos - 1) == ' ') {
pos--;
}
/* now eat any non-spaces on the left */
while (pos > 0 && get_char(current, pos - 1) != ' ') {
pos--;
}
if (remove_chars(current, pos, current->pos - pos)) {
refreshLine(current);
}
}
break;
case ctrl('T'): /* ctrl-t */
if (current->pos > 0 && current->pos <= sb_chars(current->buf)) {
/* If cursor is at end, transpose the previous two chars */
int fixer = (current->pos == sb_chars(current->buf));
c = get_char(current, current->pos - fixer);
remove_char(current, current->pos - fixer);
insert_char(current, current->pos - 1, c);
refreshLine(current);
}
break;
case ctrl('V'): /* ctrl-v */
/* Insert the ^V first */
if (insert_char(current, current->pos, c)) {
refreshLine(current);
/* Now wait for the next char. Can insert anything except \0 */
c = fd_read(current);
/* Remove the ^V first */
remove_char(current, current->pos - 1);
if (c > 0) {
/* Insert the actual char, can't be error or null */
insert_char(current, current->pos, c);
}
refreshLine(current);
}
break;
case ctrl('B'):
case SPECIAL_LEFT:
if (current->pos > 0) {
current->pos--;
refreshLine(current);
}
break;
case ctrl('F'):
case SPECIAL_RIGHT:
if (current->pos < sb_chars(current->buf)) {
current->pos++;
refreshLine(current);
}
break;
case SPECIAL_PAGE_UP:
dir = history_len - history_index - 1; /* move to start of history */
goto history_navigation;
case SPECIAL_PAGE_DOWN:
dir = -history_index; /* move to 0 == end of history, i.e. current */
goto history_navigation;
case ctrl('P'):
case SPECIAL_UP:
dir = 1;
goto history_navigation;
case ctrl('N'):
case SPECIAL_DOWN:
history_navigation:
if (history_len > 1) {
/* Update the current history entry before to
* overwrite it with tne next one. */
free(history[history_len - 1 - history_index]);
history[history_len - 1 - history_index] = strdup(sb_str(current->buf));
/* Show the new entry */
history_index += dir;
if (history_index < 0) {
history_index = 0;
break;
} else if (history_index >= history_len) {
history_index = history_len - 1;
break;
}
set_current(current, history[history_len - 1 - history_index]);
refreshLine(current);
}
break;
case ctrl('A'): /* Ctrl+a, go to the start of the line */
case SPECIAL_HOME:
current->pos = 0;
refreshLine(current);
break;
case ctrl('E'): /* ctrl+e, go to the end of the line */
case SPECIAL_END:
current->pos = sb_chars(current->buf);
refreshLine(current);
break;
case ctrl('U'): /* Ctrl+u, delete to beginning of line, save deleted chars. */
if (remove_chars(current, 0, current->pos)) {
refreshLine(current);
}
break;
case ctrl('K'): /* Ctrl+k, delete from current to end of line, save deleted chars. */
if (remove_chars(current, current->pos, sb_chars(current->buf) - current->pos)) {
refreshLine(current);
}
break;
case ctrl('Y'): /* Ctrl+y, insert saved chars at current position */
if (current->capture && insert_chars(current, current->pos, sb_str(current->capture))) {
refreshLine(current);
}
break;
case ctrl('L'): /* Ctrl+L, clear screen */
linenoiseClearScreen();
/* Force recalc of window size for serial terminals */
current->cols = 0;
current->rpos = 0;
refreshLine(current);
break;
default:
if (c >= meta('a') && c <= meta('z')) {
/* Don't insert meta chars that are not bound */
break;
}
/* Only tab is allowed without ^V */
if (c == '\t' || c >= ' ') {
if (insert_char(current, current->pos, c) == 1) {
refreshLine(current);
}
}
break;
}
}
return sb_len(current->buf);
}
int linenoiseColumns(void)
{
struct current current;
current.output = NULL;
enableRawMode (&current);
getWindowSize (&current);
disableRawMode (&current);
return current.cols;
}
/**
* Reads a line from the file handle (without the trailing NL or CRNL)
* and returns it in a stringbuf.
* Returns NULL if no characters are read before EOF or error.
*
* Note that the character count will *not* be correct for lines containing
* utf8 sequences. Do not rely on the character count.
*/
static stringbuf *sb_getline(FILE *fh)
{
stringbuf *sb = sb_alloc();
int c;
int n = 0;
while ((c = getc(fh)) != EOF) {
char ch;
n++;
if (c == '\r') {
/* CRLF -> LF */
continue;
}
if (c == '\n' || c == '\r') {
break;
}
ch = c;
/* ignore the effect of character count for partial utf8 sequences */
sb_append_len(sb, &ch, 1);
}
if (n == 0 || sb->data == NULL) {
sb_free(sb);
return NULL;
}
return sb;
}
char *linenoiseWithInitial(const char *prompt, const char *initial)
{
int count;
struct current current;
stringbuf *sb;
memset(&current, 0, sizeof(current));
if (enableRawMode(&current) == -1) {
printf("%s", prompt);
fflush(stdout);
sb = sb_getline(stdin);
if (sb && !fd_isatty(&current)) {
printf("%s\n", sb_str(sb));
fflush(stdout);
}
}
else {
current.buf = sb_alloc();
current.pos = 0;
current.nrows = 1;
current.prompt = prompt;
/* The latest history entry is always our current buffer */
linenoiseHistoryAdd(initial);
set_current(&current, initial);
count = linenoiseEdit(&current);
disableRawMode(&current);
printf("\n");
sb_free(current.capture);
if (count == -1) {
sb_free(current.buf);
return NULL;
}
sb = current.buf;
}
return sb ? sb_to_string(sb) : NULL;
}
char *linenoise(const char *prompt)
{
return linenoiseWithInitial(prompt, "");
}
/* Using a circular buffer is smarter, but a bit more complex to handle. */
static int linenoiseHistoryAddAllocated(char *line) {
if (history_max_len == 0) {
notinserted:
free(line);
return 0;
}
if (history == NULL) {
history = (char **)calloc(sizeof(char*), history_max_len);
}
/* do not insert duplicate lines into history */
if (history_len > 0 && strcmp(line, history[history_len - 1]) == 0) {
goto notinserted;
}
if (history_len == history_max_len) {
free(history[0]);
memmove(history,history+1,sizeof(char*)*(history_max_len-1));
history_len--;
}
history[history_len] = line;
history_len++;
return 1;
}
int linenoiseHistoryAdd(const char *line) {
return linenoiseHistoryAddAllocated(strdup(line));
}
int linenoiseHistoryGetMaxLen(void) {
return history_max_len;
}
int linenoiseHistorySetMaxLen(int len) {
char **newHistory;
if (len < 1) return 0;
if (history) {
int tocopy = history_len;
newHistory = (char **)calloc(sizeof(char*), len);
/* If we can't copy everything, free the elements we'll not use. */
if (len < tocopy) {
int j;
for (j = 0; j < tocopy-len; j++) free(history[j]);
tocopy = len;
}
memcpy(newHistory,history+(history_len-tocopy), sizeof(char*)*tocopy);
free(history);
history = newHistory;
}
history_max_len = len;
if (history_len > history_max_len)
history_len = history_max_len;
return 1;
}
/* Save the history in the specified file. On success 0 is returned
* otherwise -1 is returned. */
int linenoiseHistorySave(const char *filename) {
FILE *fp = fopen(filename,"w");
int j;
if (fp == NULL) return -1;
for (j = 0; j < history_len; j++) {
const char *str = history[j];
/* Need to encode backslash, nl and cr */
while (*str) {
if (*str == '\\') {
fputs("\\\\", fp);
}
else if (*str == '\n') {
fputs("\\n", fp);
}
else if (*str == '\r') {
fputs("\\r", fp);
}
else {
fputc(*str, fp);
}
str++;
}
fputc('\n', fp);
}
fclose(fp);
return 0;
}
/* Load the history from the specified file.
*
* If the file does not exist or can't be opened, no operation is performed
* and -1 is returned.
* Otherwise 0 is returned.
*/
int linenoiseHistoryLoad(const char *filename) {
FILE *fp = fopen(filename,"r");
stringbuf *sb;
if (fp == NULL) return -1;
while ((sb = sb_getline(fp)) != NULL) {
/* Take the stringbuf and decode backslash escaped values */
char *buf = sb_to_string(sb);
char *dest = buf;
const char *src;
for (src = buf; *src; src++) {
char ch = *src;
if (ch == '\\') {
src++;
if (*src == 'n') {
ch = '\n';
}
else if (*src == 'r') {
ch = '\r';
} else {
ch = *src;
}
}
*dest++ = ch;
}
*dest = 0;
linenoiseHistoryAddAllocated(buf);
}
fclose(fp);
return 0;
}
/* Provide access to the history buffer.
*
* If 'len' is not NULL, the length is stored in *len.
*/
char **linenoiseHistory(int *len) {
if (len) {
*len = history_len;
}
return history;
}
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