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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 [ n K
* Effect: if n is 0 or missing, clear from cursor to end of line
* Effect: if n is 1, clear from beginning of line to cursor
* Effect: if n is 2, clear entire line
*
* CUF (CUrsor Forward)
* Sequence: ESC [ n C
* Effect: moves cursor forward of 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
*
* 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
#else
/* Microsoft headers don't like old POSIX names */
#define strdup _strdup
#define snprintf _snprintf
#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 <errno.h>
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include "linenoise.h"
#include "utf8.h"
#define LINENOISE_DEFAULT_HISTORY_MAX_LEN 100
#define LINENOISE_MAX_LINE 4096
#define ctrl(C) ((C) - '@')
/* Use -ve numbers here to co-exist with normal unicode chars */
enum {
SPECIAL_NONE,
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
};
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 {
char *buf; /* Current buffer. Always null terminated */
int bufmax; /* Size of the buffer, including space for the null termination */
int len; /* Number of bytes in 'buf' */
int chars; /* Number of chars in 'buf' (utf-8 chars) */
int pos; /* Cursor position, measured in chars */
int cols; /* Size of the window, in chars */
const char *prompt;
char *capture; /* Allocated capture buffer, or NULL for none. Always null terminated */
#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 */
#endif
};
static int fd_read(struct current *current);
static int getWindowSize(struct current *current);
void linenoiseHistoryFree(void) {
if (history) {
int j;
for (j = 0; j < history_len; j++)
free(history[j]);
free(history);
history = NULL;
history_len = 0;
}
}
#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",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) {}
/* This is fdprintf() on some systems, but use a different
* name to avoid conflicts
*/
static void fd_printf(int fd, const char *format, ...)
{
va_list args;
char buf[64];
int n;
va_start(args, format);
n = vsnprintf(buf, sizeof(buf), format, args);
va_end(args);
IGNORE_RC(write(fd, buf, n));
}
void linenoiseClearScreen(void)
{
fd_printf(STDOUT_FILENO, "\x1b[H\x1b[2J");
}
static void cursorToLeft(struct current *current)
{
fd_printf(current->fd, "\r");
}
static int outputChars(struct current *current, const char *buf, int len)
{
return write(current->fd, buf, len);
}
static void outputControlChar(struct current *current, char ch)
{
fd_printf(current->fd, "\x1b[7m^%c\x1b[0m", ch);
}
static void eraseEol(struct current *current)
{
fd_printf(current->fd, "\x1b[0K");
}
static void setCursorPos(struct current *current, int x)
{
if (x == 0) {
cursorToLeft(current);
}
else {
fd_printf(current->fd, "\r\x1b[%dC", x);
}
}
/**
* 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[4];
int n;
int i;
int c;
if (read(current->fd, &buf[0], 1) != 1) {
return -1;
}
n = utf8_charlen(buf[0]);
if (n < 1 || n > 3) {
return -1;
}
for (i = 1; i < n; i++) {
if (read(current->fd, &buf[i], 1) != 1) {
return -1;
}
}
buf[n] = 0;
/* decode and return the character */
utf8_tounicode(buf, &c);
return c;
#else
return fd_read_char(current->fd, -1);
#endif
}
static int countColorControlChars(const char* prompt)
{
/* ANSI color control sequences have the form:
* "\x1b" "[" [0-9;]* "m"
* We parse them with a simple state machine.
*/
enum {
search_esc,
expect_bracket,
expect_trail
} state = search_esc;
int len = 0, found = 0;
char ch;
/* XXX: Strictly we should be checking utf8 chars rather than
* bytes in case of the extremely unlikely scenario where
* an ANSI sequence is part of a utf8 sequence.
*/
while ((ch = *prompt++) != 0) {
switch (state) {
case search_esc:
if (ch == '\x1b') {
state = expect_bracket;
}
break;
case expect_bracket:
if (ch == '[') {
state = expect_trail;
/* 3 for "\e[ ... m" */
len = 3;
break;
}
state = search_esc;
break;
case expect_trail:
if ((ch == ';') || ((ch >= '0' && ch <= '9'))) {
/* 0-9, or semicolon */
len++;
break;
}
if (ch == 'm') {
found += len;
}
state = search_esc;
break;
}
}
return found;
}
/**
* Stores the current cursor column in '*cols'.
* Returns 1 if OK, or 0 if failed to determine cursor pos.
*/
static int queryCursor(int fd, int* cols)
{
/* control sequence - report cursor location */
fd_printf(fd, "\x1b[6n");
/* Parse the response: ESC [ rows ; cols R */
if (fd_read_char(fd, 100) == 0x1b &&
fd_read_char(fd, 100) == '[') {
int n = 0;
while (1) {
int ch = fd_read_char(fd, 100);
if (ch == ';') {
/* Ignore rows */
n = 0;
}
else if (ch == 'R') {
/* Got cols */
if (n != 0 && n < 1000) {
*cols = n;
}
break;
}
else if (ch >= 0 && ch <= '9') {
n = n * 10 + ch - '0';
}
else {
break;
}
}
return 1;
}
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;
current->cols = 80;
/* (a) */
if (queryCursor (current->fd, &here)) {
/* (b) */
fd_printf(current->fd, "\x1b[999C");
/* (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->fd, &current->cols)) {
/* (d') Unable to get accurate position data, reset
* the cursor to the far left. While this may not
* restore the exact original position it should not
* be too bad.
*/
fd_printf(current->fd, "\r");
} else {
/* (d) Reset the cursor back to the original location. */
if (current->cols > here) {
fd_printf(current->fd, "\x1b[%dD", current->cols - here);
}
}
} /* 1st query failed, doing nothing => default 80 */
}
return 0;
}
/**
* If escape (27) 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,
* 27 is returned.
*/
static int check_special(int fd)
{
int c = fd_read_char(fd, 50);
int c2;
if (c < 0) {
return 27;
}
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;
}
#elif defined(USE_WINCONSOLE)
static DWORD orig_consolemode = 0;
static int enableRawMode(struct current *current) {
DWORD n;
INPUT_RECORD irec;
current->outh = GetStdHandle(STD_OUTPUT_HANDLE);
current->inh = GetStdHandle(STD_INPUT_HANDLE);
if (!PeekConsoleInput(current->inh, &irec, 1, &n)) {
return -1;
}
if (getWindowSize(current) != 0) {
return -1;
}
if (GetConsoleMode(current->inh, &orig_consolemode)) {
SetConsoleMode(current->inh, ENABLE_PROCESSED_INPUT);
}
return 0;
}
static void disableRawMode(struct current *current)
{
SetConsoleMode(current->inh, orig_consolemode);
}
void linenoiseClearScreen(void)
{
/* XXX: This is ugly. Should just have the caller pass a handle */
struct current current;
current.outh = GetStdHandle(STD_OUTPUT_HANDLE);
if (getWindowSize(&current) == 0) {
COORD topleft = { 0, 0 };
DWORD n;
FillConsoleOutputCharacter(current.outh, ' ',
current.cols * current.rows, topleft, &n);
FillConsoleOutputAttribute(current.outh,
FOREGROUND_RED | FOREGROUND_BLUE | FOREGROUND_GREEN,
current.cols * current.rows, topleft, &n);
SetConsoleCursorPosition(current.outh, topleft);
}
}
static void cursorToLeft(struct current *current)
{
COORD pos;
DWORD n;
pos.X = 0;
pos.Y = (SHORT)current->y;
FillConsoleOutputAttribute(current->outh,
FOREGROUND_RED | FOREGROUND_BLUE | FOREGROUND_GREEN, current->cols, pos, &n);
current->x = 0;
}
static int outputChars(struct current *current, const char *buf, int len)
{
COORD pos;
DWORD n;
pos.Y = (SHORT)current->y;
#ifdef USE_UTF8
while ( len > 0 ) {
int c, s;
wchar_t wc;
s = utf8_tounicode(buf, &c);
len -= s;
buf += s;
wc = (wchar_t)c;
pos.X = (SHORT)current->x;
/* fixed display utf8 character */
WriteConsoleOutputCharacterW(current->outh, &wc, 1, pos, &n);
current->x += utf8_width(c);
}
#else
pos.X = (SHORT)current->x;
WriteConsoleOutputCharacterA(current->outh, buf, len, pos, &n);
current->x += len;
#endif
return 0;
}
static void outputControlChar(struct current *current, char ch)
{
COORD pos;
DWORD n;
pos.X = (SHORT) current->x;
pos.Y = (SHORT) current->y;
FillConsoleOutputAttribute(current->outh, BACKGROUND_INTENSITY, 2, pos, &n);
outputChars(current, "^", 1);
outputChars(current, &ch, 1);
}
static void eraseEol(struct current *current)
{
COORD pos;
DWORD n;
pos.X = (SHORT) current->x;
pos.Y = (SHORT) current->y;
FillConsoleOutputCharacter(current->outh, ' ', current->cols - current->x, pos, &n);
}
static void setCursorPos(struct current *current, int x)
{
COORD pos;
pos.X = (SHORT)x;
pos.Y = (SHORT) current->y;
SetConsoleCursorPosition(current->outh, pos);
current->x = x;
}
static int fd_read(struct current *current)
{
while (1) {
INPUT_RECORD irec;
DWORD n;
if (WaitForSingleObject(current->inh, INFINITE) != WAIT_OBJECT_0) {
break;
}
if (!ReadConsoleInput (current->inh, &irec, 1, &n)) {
break;
}
if (irec.EventType == KEY_EVENT && irec.Event.KeyEvent.bKeyDown) {
KEY_EVENT_RECORD *k = &irec.Event.KeyEvent;
if (k->dwControlKeyState & ENHANCED_KEY) {
switch (k->wVirtualKeyCode) {
case VK_LEFT:
return SPECIAL_LEFT;
case VK_RIGHT:
return SPECIAL_RIGHT;
case VK_UP:
return SPECIAL_UP;
case VK_DOWN:
return SPECIAL_DOWN;
case VK_INSERT:
return SPECIAL_INSERT;
case VK_DELETE:
return SPECIAL_DELETE;
case VK_HOME:
return SPECIAL_HOME;
case VK_END:
return SPECIAL_END;
case VK_PRIOR:
return SPECIAL_PAGE_UP;
case VK_NEXT:
return SPECIAL_PAGE_DOWN;
}
}
/* Note that control characters are already translated in AsciiChar */
else if (k->wVirtualKeyCode == VK_CONTROL)
continue;
else {
#ifdef USE_UTF8
return k->uChar.UnicodeChar;
#else
return k->uChar.AsciiChar;
#endif
}
}
}
return -1;
}
static int countColorControlChars(const char* prompt)
{
/* For windows we assume that there are no embedded ansi color
* control sequences.
*/
return 0;
}
static int getWindowSize(struct current *current)
{
CONSOLE_SCREEN_BUFFER_INFO info;
if (!GetConsoleScreenBufferInfo(current->outh, &info)) {
return -1;
}
current->cols = info.dwSize.X;
current->rows = info.dwSize.Y;
if (current->cols <= 0 || current->rows <= 0) {
current->cols = 80;
return -1;
}
current->y = info.dwCursorPosition.Y;
current->x = info.dwCursorPosition.X;
return 0;
}
#endif
#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 < current->chars) {
int c;
int i = utf8_index(current->buf, pos);
(void)utf8_tounicode(current->buf + i, &c);
return c;
}
return -1;
}
static void refreshLine(const char *prompt, struct current *current)
{
int plen;
int pchars;
int backup = 0;
int i;
const char *buf = current->buf;
int chars = current->chars;
int pos = current->pos;
int b;
int ch;
int n;
int width;
int bufwidth;
/* Should intercept SIGWINCH. For now, just get the size every time */
getWindowSize(current);
plen = strlen(prompt);
pchars = utf8_strwidth(prompt, utf8_strlen(prompt, plen));
/* Scan the prompt for embedded ansi color control sequences and
* discount them as characters/columns.
*/
pchars -= countColorControlChars(prompt);
/* Account for a line which is too long to fit in the window.
* Note that control chars require an extra column
*/
/* How many cols are required to the left of 'pos'?
* The prompt, plus one extra for each control char
*/
n = pchars + utf8_strwidth(buf, utf8_strlen(buf, current->len));
b = 0;
for (i = 0; i < pos; i++) {
b += utf8_tounicode(buf + b, &ch);
if (ch < ' ') {
n++;
}
}
/* Pluse one if the current char is a control character */
if (current->pos < current->chars && get_char(current, current->pos) < ' ') {
n++;
}
/* If too many are needed, strip chars off the front of 'buf'
* until it fits. Note that if the current char is a control character,
* we need one extra col.
*/
while (n >= current->cols && pos > 0) {
b = utf8_tounicode(buf, &ch);
if (ch < ' ') {
n--;
}
n -= utf8_width(ch);
buf += b;
pos--;
chars--;
}
/* Cursor to left edge, then the prompt */
cursorToLeft(current);
outputChars(current, prompt, plen);
/* Now the current buffer content */
/* Need special handling for control characters.
* If we hit 'cols', stop.
*/
b = 0; /* unwritted bytes */
n = 0; /* How many control chars were written */
width = 0; /* current display width */
bufwidth = utf8_strwidth(buf, pos);
for (i = 0; i < chars; i++) {
int ch;
int w = utf8_tounicode(buf + b, &ch);
if (ch < ' ') {
n++;
}
width += utf8_width(ch);
if (pchars + width + n >= current->cols) {
break;
}
if (ch < ' ') {
/* A control character, so write the buffer so far */
outputChars(current, buf, b);
buf += b + w;
b = 0;
outputControlChar(current, ch + '@');
if (i < pos) {
backup++;
}
}
else {
b += w;
}
}
outputChars(current, buf, b);
/* Erase to right, move cursor to original position */
eraseEol(current);
setCursorPos(current, bufwidth + pchars + backup);
}
static void set_current(struct current *current, const char *str)
{
strncpy(current->buf, str, current->bufmax);
current->buf[current->bufmax - 1] = 0;
current->len = strlen(current->buf);
current->pos = current->chars = utf8_strlen(current->buf, current->len);
}
static int has_room(struct current *current, int bytes)
{
return current->len + bytes < current->bufmax - 1;
}
/**
* 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 < current->chars) {
int p1, p2;
int ret = 1;
p1 = utf8_index(current->buf, pos);
p2 = p1 + utf8_index(current->buf + p1, 1);
#ifdef USE_TERMIOS
/* optimise remove char in the case of removing the last char */
if (current->pos == pos + 1 && current->pos == current->chars) {
if (current->buf[pos] >= ' ' && utf8_strlen(current->prompt, -1) + utf8_strlen(current->buf, current->len) < current->cols - 1) {
ret = 2;
fd_printf(current->fd, "\b \b");
}
}
#endif
/* Move the null char too */
memmove(current->buf + p1, current->buf + p2, current->len - p2 + 1);
current->len -= (p2 - p1);
current->chars--;
if (current->pos > pos) {
current->pos--;
}
return ret;
}
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)
{
char buf[3];
int n = utf8_getchars(buf, ch);
if (has_room(current, n) && pos >= 0 && pos <= current->chars) {
int p1, p2;
int ret = 1;
p1 = utf8_index(current->buf, pos);
p2 = p1 + n;
#ifdef USE_TERMIOS
/* optimise the case where adding a single char to the end and no scrolling is needed */
if (current->pos == pos && current->chars == pos) {
if (ch >= ' ' && utf8_strlen(current->prompt, -1) + utf8_strlen(current->buf, current->len) < current->cols - 1) {
IGNORE_RC(write(current->fd, buf, n));
ret = 2;
}
}
#endif
memmove(current->buf + p2, current->buf + p1, current->len - p1);
memcpy(current->buf + p1, buf, n);
current->len += n;
current->chars++;
if (current->pos >= pos) {
current->pos++;
}
return ret;
}
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 n)
{
if (pos >= 0 && (pos + n - 1) < current->chars) {
int p1 = utf8_index(current->buf, pos);
int nbytes = utf8_index(current->buf + p1, n);
if (nbytes) {
free(current->capture);
/* Include space for the null terminator */
current->capture = (char *)malloc(nbytes + 1);
memcpy(current->capture, current->buf + p1, nbytes);
current->capture[nbytes] = '\0';
}
}
}
/**
* 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;
}
#ifndef NO_COMPLETION
static linenoiseCompletionCallback *completionCallback = NULL;
static void *completionUserdata = NULL;
static void beep() {
#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(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) {
struct current tmp = *current;
tmp.buf = lc.cvec[i];
tmp.pos = tmp.len = strlen(tmp.buf);
tmp.chars = utf8_strlen(tmp.buf, tmp.len);
refreshLine(current->prompt, &tmp);
} else {
refreshLine(current->prompt, 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 27: /* escape */
/* Re-show original buffer */
if (i < lc.len) {
refreshLine(current->prompt, 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);
}
#endif
static int linenoiseEdit(struct current *current) {
int history_index = 0;
/* The latest history entry is always our current buffer, that
* initially is just an empty string. */
linenoiseHistoryAdd("");
set_current(current, "");
refreshLine(current->prompt, 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 == current->chars && completionCallback != NULL) {
c = completeLine(current);
/* Return on errors */
if (c < 0) return current->len;
/* Read next character when 0 */
if (c == 0) continue;
}
#endif
process_char:
if (c == -1) return current->len;
#ifdef USE_TERMIOS
if (c == 27) { /* escape sequence */
c = check_special(current->fd);
}
#endif
switch(c) {
case '\r': /* enter */
history_len--;
free(history[history_len]);
return current->len;
case ctrl('C'): /* ctrl-c */
errno = EAGAIN;
return -1;
case 127: /* backspace */
case ctrl('H'):
if (remove_char(current, current->pos - 1) == 1) {
refreshLine(current->prompt, current);
}
break;
case ctrl('D'): /* ctrl-d */
if (current->len == 0) {
/* Empty line, so EOF */
history_len--;
free(history[history_len]);
return -1;
}
/* Otherwise fall through to delete char to right of cursor */
case SPECIAL_DELETE:
if (remove_char(current, current->pos) == 1) {
refreshLine(current->prompt, current);
}
break;
case SPECIAL_INSERT:
/* Ignore. Expansion Hook.
* Future possibility: Toggle Insert/Overwrite Modes
*/
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->prompt, current);
}
}
break;
case ctrl('R'): /* ctrl-r */
{
/* 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;
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);
refreshLine(rprompt, current);
c = fd_read(current);
if (c == ctrl('H') || c == 127) {
if (rchars) {
int p = utf8_index(rbuf, --rchars);
rbuf[p] = 0;
rlen = strlen(rbuf);
}
continue;
}
#ifdef USE_TERMIOS
if (c == 27) {
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 >= ' ') {
if (rlen >= (int)sizeof(rbuf) + 3) {
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], 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->prompt, current);
goto process_char;
}
break;
case ctrl('T'): /* ctrl-t */
if (current->pos > 0 && current->pos <= current->chars) {
/* If cursor is at end, transpose the previous two chars */
int fixer = (current->pos == current->chars);
c = get_char(current, current->pos - fixer);
remove_char(current, current->pos - fixer);
insert_char(current, current->pos - 1, c);
refreshLine(current->prompt, current);
}
break;
case ctrl('V'): /* ctrl-v */
if (has_room(current, 3)) {
/* Insert the ^V first */
if (insert_char(current, current->pos, c)) {
refreshLine(current->prompt, 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 != -1) {
/* Insert the actual char */
insert_char(current, current->pos, c);
}
refreshLine(current->prompt, current);
}
}
break;
case ctrl('B'):
case SPECIAL_LEFT:
if (current->pos > 0) {
current->pos--;
refreshLine(current->prompt, current);
}
break;
case ctrl('F'):
case SPECIAL_RIGHT:
if (current->pos < current->chars) {
current->pos++;
refreshLine(current->prompt, 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(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->prompt, current);
}
break;
case ctrl('A'): /* Ctrl+a, go to the start of the line */
case SPECIAL_HOME:
current->pos = 0;
refreshLine(current->prompt, current);
break;
case ctrl('E'): /* ctrl+e, go to the end of the line */
case SPECIAL_END:
current->pos = current->chars;
refreshLine(current->prompt, current);
break;
case ctrl('U'): /* Ctrl+u, delete to beginning of line, save deleted chars. */
if (remove_chars(current, 0, current->pos)) {
refreshLine(current->prompt, current);
}
break;
case ctrl('K'): /* Ctrl+k, delete from current to end of line, save deleted chars. */
if (remove_chars(current, current->pos, current->chars - current->pos)) {
refreshLine(current->prompt, current);
}
break;
case ctrl('Y'): /* Ctrl+y, insert saved chars at current position */
if (current->capture && insert_chars(current, current->pos, current->capture)) {
refreshLine(current->prompt, current);
}
break;
case ctrl('L'): /* Ctrl+L, clear screen */
linenoiseClearScreen();
/* Force recalc of window size for serial terminals */
current->cols = 0;
refreshLine(current->prompt, current);
break;
default:
/* Only tab is allowed without ^V */
if (c == '\t' || c >= ' ') {
if (insert_char(current, current->pos, c) == 1) {
refreshLine(current->prompt, current);
}
}
break;
}
}
return current->len;
}
int linenoiseColumns(void)
{
struct current current;
enableRawMode (&current);
getWindowSize (&current);
disableRawMode (&current);
return current.cols;
}
char *linenoise(const char *prompt)
{
int count;
struct current current;
char buf[LINENOISE_MAX_LINE];
if (enableRawMode(&current) == -1) {
printf("%s", prompt);
fflush(stdout);
if (fgets(buf, sizeof(buf), stdin) == NULL) {
return NULL;
}
count = strlen(buf);
if (count && buf[count-1] == '\n') {
count--;
buf[count] = '\0';
}
}
else
{
current.buf = buf;
current.bufmax = sizeof(buf);
current.len = 0;
current.chars = 0;
current.pos = 0;
current.prompt = prompt;
current.capture = NULL;
count = linenoiseEdit(&current);
disableRawMode(&current);
printf("\n");
free(current.capture);
if (count == -1) {
return NULL;
}
}
return strdup(buf);
}
/* Using a circular buffer is smarter, but a bit more complex to handle. */
int linenoiseHistoryAdd(const char *line) {
char *linecopy;
if (history_max_len == 0) return 0;
if (history == NULL) {
history = (char **)malloc(sizeof(char*)*history_max_len);
if (history == NULL) return 0;
memset(history,0,(sizeof(char*)*history_max_len));
}
/* do not insert duplicate lines into history */
if (history_len > 0 && strcmp(line, history[history_len - 1]) == 0) {
return 0;
}
linecopy = strdup(line);
if (!linecopy) return 0;
if (history_len == history_max_len) {
free(history[0]);
memmove(history,history+1,sizeof(char*)*(history_max_len-1));
history_len--;
}
history[history_len] = linecopy;
history_len++;
return 1;
}
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 **)malloc(sizeof(char*)*len);
if (newHistory == NULL) return 0;
/* 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;
}
memset(newHistory,0,sizeof(char*)*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
* zero is returned and no operation is performed.
*
* If the file exists and the operation succeeded 0 is returned, otherwise
* on error -1 is returned. */
int linenoiseHistoryLoad(const char *filename) {
FILE *fp = fopen(filename,"r");
char buf[LINENOISE_MAX_LINE];
if (fp == NULL) return -1;
while (fgets(buf,LINENOISE_MAX_LINE,fp) != NULL) {
char *src, *dest;
/* Decode backslash escaped values */
for (src = dest = 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;
}
/* Remove trailing newline */
if (dest != buf && (dest[-1] == '\n' || dest[-1] == '\r')) {
dest--;
}
*dest = 0;
linenoiseHistoryAdd(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;
}