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-rw-r--r--linenoise/linenoise.c1201
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diff --git a/linenoise/linenoise.c b/linenoise/linenoise.c
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--- a/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/antirez/linenoise
- *
- * Does a number of crazy assumptions that happen to be true in 99.9999% of
- * the 2010 UNIX computers around.
- *
- * ------------------------------------------------------------------------
- *
- * Copyright (c) 2010-2016, Salvatore Sanfilippo <antirez at gmail dot com>
- * Copyright (c) 2010-2013, Pieter Noordhuis <pcnoordhuis at gmail dot com>
- *
- * 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
- *
- * Todo list:
- * - Filter bogus Ctrl+<char> combinations.
- * - Win32 support
- *
- * Bloat:
- * - History search like Ctrl+r in readline?
- *
- * List of escape sequences used by this program, we do everything just
- * with three 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 n chars
- *
- * CUB (CUrsor Backward)
- * Sequence: ESC [ n D
- * Effect: moves cursor backward n chars
- *
- * The following is used to get the terminal width if getting
- * the width with the TIOCGWINSZ ioctl fails
- *
- * DSR (Device Status Report)
- * Sequence: ESC [ 6 n
- * Effect: reports the current cusor position as ESC [ n ; m R
- * where n is the row and m is the column
- *
- * When multi line mode is enabled, we also use an additional escape
- * sequence. However multi line editing is disabled by default.
- *
- * CUU (Cursor Up)
- * Sequence: ESC [ n A
- * Effect: moves cursor up of n chars.
- *
- * CUD (Cursor Down)
- * Sequence: ESC [ n B
- * Effect: moves cursor down of n chars.
- *
- * When linenoiseClearScreen() is called, two additional escape sequences
- * are used in order to clear the screen and position the cursor at home
- * position.
- *
- * CUP (Cursor position)
- * Sequence: ESC [ H
- * Effect: moves the cursor to upper left corner
- *
- * ED (Erase display)
- * Sequence: ESC [ 2 J
- * Effect: clear the whole screen
- *
- */
-
-#include <termios.h>
-#include <unistd.h>
-#include <stdlib.h>
-#include <stdio.h>
-#include <errno.h>
-#include <string.h>
-#include <stdlib.h>
-#include <ctype.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-#include <sys/ioctl.h>
-#include <unistd.h>
-#include "linenoise.h"
-
-#define LINENOISE_DEFAULT_HISTORY_MAX_LEN 100
-#define LINENOISE_MAX_LINE 4096
-static char *unsupported_term[] = {"dumb","cons25","emacs",NULL};
-static linenoiseCompletionCallback *completionCallback = NULL;
-static linenoiseHintsCallback *hintsCallback = NULL;
-static linenoiseFreeHintsCallback *freeHintsCallback = NULL;
-
-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 mlmode = 0; /* Multi line mode. Default is single line. */
-static int atexit_registered = 0; /* Register atexit just 1 time. */
-static int history_max_len = LINENOISE_DEFAULT_HISTORY_MAX_LEN;
-static int history_len = 0;
-static char **history = NULL;
-
-/* The linenoiseState structure represents the state during line editing.
- * We pass this state to functions implementing specific editing
- * functionalities. */
-struct linenoiseState {
- int ifd; /* Terminal stdin file descriptor. */
- int ofd; /* Terminal stdout file descriptor. */
- char *buf; /* Edited line buffer. */
- size_t buflen; /* Edited line buffer size. */
- const char *prompt; /* Prompt to display. */
- size_t plen; /* Prompt length. */
- size_t pos; /* Current cursor position. */
- size_t oldpos; /* Previous refresh cursor position. */
- size_t len; /* Current edited line length. */
- size_t cols; /* Number of columns in terminal. */
- size_t maxrows; /* Maximum num of rows used so far (multiline mode) */
- int history_index; /* The history index we are currently editing. */
-};
-
-enum KEY_ACTION{
- KEY_NULL = 0, /* NULL */
- CTRL_A = 1, /* Ctrl+a */
- CTRL_B = 2, /* Ctrl-b */
- CTRL_C = 3, /* Ctrl-c */
- CTRL_D = 4, /* Ctrl-d */
- CTRL_E = 5, /* Ctrl-e */
- CTRL_F = 6, /* Ctrl-f */
- CTRL_H = 8, /* Ctrl-h */
- TAB = 9, /* Tab */
- CTRL_K = 11, /* Ctrl+k */
- CTRL_L = 12, /* Ctrl+l */
- ENTER = 13, /* Enter */
- CTRL_N = 14, /* Ctrl-n */
- CTRL_P = 16, /* Ctrl-p */
- CTRL_T = 20, /* Ctrl-t */
- CTRL_U = 21, /* Ctrl+u */
- CTRL_W = 23, /* Ctrl+w */
- ESC = 27, /* Escape */
- BACKSPACE = 127 /* Backspace */
-};
-
-static void linenoiseAtExit(void);
-int linenoiseHistoryAdd(const char *line);
-static void refreshLine(struct linenoiseState *l);
-
-/* Debugging macro. */
-#if 0
-FILE *lndebug_fp = NULL;
-#define lndebug(...) \
- do { \
- if (lndebug_fp == NULL) { \
- lndebug_fp = fopen("/tmp/lndebug.txt","a"); \
- fprintf(lndebug_fp, \
- "[%d %d %d] p: %d, rows: %d, rpos: %d, max: %d, oldmax: %d\n", \
- (int)l->len,(int)l->pos,(int)l->oldpos,plen,rows,rpos, \
- (int)l->maxrows,old_rows); \
- } \
- fprintf(lndebug_fp, ", " __VA_ARGS__); \
- fflush(lndebug_fp); \
- } while (0)
-#else
-#define lndebug(fmt, ...)
-#endif
-
-/* ======================= Low level terminal handling ====================== */
-
-/* Set if to use or not the multi line mode. */
-void linenoiseSetMultiLine(int ml) {
- mlmode = ml;
-}
-
-/* Return true if the terminal name is in the list of terminals we know are
- * not able to understand basic escape sequences. */
-static int isUnsupportedTerm(void) {
- char *term = getenv("TERM");
- int j;
-
- if (term == NULL) return 0;
- for (j = 0; unsupported_term[j]; j++)
- if (!strcasecmp(term,unsupported_term[j])) return 1;
- return 0;
-}
-
-/* Raw mode: 1960 magic shit. */
-static int enableRawMode(int fd) {
- struct termios raw;
-
- if (!isatty(STDIN_FILENO)) goto fatal;
- if (!atexit_registered) {
- atexit(linenoiseAtExit);
- atexit_registered = 1;
- }
- if (tcgetattr(fd,&orig_termios) == -1) goto fatal;
-
- 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 - 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(fd,TCSAFLUSH,&raw) < 0) goto fatal;
- rawmode = 1;
- return 0;
-
-fatal:
- errno = ENOTTY;
- return -1;
-}
-
-static void disableRawMode(int fd) {
- /* Don't even check the return value as it's too late. */
- if (rawmode && tcsetattr(fd,TCSAFLUSH,&orig_termios) != -1)
- rawmode = 0;
-}
-
-/* Use the ESC [6n escape sequence to query the horizontal cursor position
- * and return it. On error -1 is returned, on success the position of the
- * cursor. */
-static int getCursorPosition(int ifd, int ofd) {
- char buf[32];
- int cols, rows;
- unsigned int i = 0;
-
- /* Report cursor location */
- if (write(ofd, "\x1b[6n", 4) != 4) return -1;
-
- /* Read the response: ESC [ rows ; cols R */
- while (i < sizeof(buf)-1) {
- if (read(ifd,buf+i,1) != 1) break;
- if (buf[i] == 'R') break;
- i++;
- }
- buf[i] = '\0';
-
- /* Parse it. */
- if (buf[0] != ESC || buf[1] != '[') return -1;
- if (sscanf(buf+2,"%d;%d",&rows,&cols) != 2) return -1;
- return cols;
-}
-
-/* Try to get the number of columns in the current terminal, or assume 80
- * if it fails. */
-static int getColumns(int ifd, int ofd) {
- struct winsize ws;
-
- if (ioctl(1, TIOCGWINSZ, &ws) == -1 || ws.ws_col == 0) {
- /* ioctl() failed. Try to query the terminal itself. */
- int start, cols;
-
- /* Get the initial position so we can restore it later. */
- start = getCursorPosition(ifd,ofd);
- if (start == -1) goto failed;
-
- /* Go to right margin and get position. */
- if (write(ofd,"\x1b[999C",6) != 6) goto failed;
- cols = getCursorPosition(ifd,ofd);
- if (cols == -1) goto failed;
-
- /* Restore position. */
- if (cols > start) {
- char seq[32];
- snprintf(seq,32,"\x1b[%dD",cols-start);
- if (write(ofd,seq,strlen(seq)) == -1) {
- /* Can't recover... */
- }
- }
- return cols;
- } else {
- return ws.ws_col;
- }
-
-failed:
- return 80;
-}
-
-/* Clear the screen. Used to handle ctrl+l */
-void linenoiseClearScreen(void) {
- if (write(STDOUT_FILENO,"\x1b[H\x1b[2J",7) <= 0) {
- /* nothing to do, just to avoid warning. */
- }
-}
-
-/* Beep, used for completion when there is nothing to complete or when all
- * the choices were already shown. */
-static void linenoiseBeep(void) {
- fprintf(stderr, "\x7");
- fflush(stderr);
-}
-
-/* ============================== Completion ================================ */
-
-/* Free a list of completion option populated by linenoiseAddCompletion(). */
-static void freeCompletions(linenoiseCompletions *lc) {
- size_t i;
- for (i = 0; i < lc->len; i++)
- free(lc->cvec[i]);
- if (lc->cvec != NULL)
- free(lc->cvec);
-}
-
-/* This is an helper function for linenoiseEdit() and is called when the
- * user types the <tab> key in order to complete the string currently in the
- * input.
- *
- * The state of the editing is encapsulated into the pointed linenoiseState
- * structure as described in the structure definition. */
-static int completeLine(struct linenoiseState *ls) {
- linenoiseCompletions lc = { 0, NULL };
- int nread, nwritten;
- char c = 0;
-
- completionCallback(ls->buf,&lc);
- if (lc.len == 0) {
- linenoiseBeep();
- } else {
- size_t stop = 0, i = 0;
-
- while(!stop) {
- /* Show completion or original buffer */
- if (i < lc.len) {
- struct linenoiseState saved = *ls;
-
- ls->len = ls->pos = strlen(lc.cvec[i]);
- ls->buf = lc.cvec[i];
- refreshLine(ls);
- ls->len = saved.len;
- ls->pos = saved.pos;
- ls->buf = saved.buf;
- } else {
- refreshLine(ls);
- }
-
- nread = read(ls->ifd,&c,1);
- if (nread <= 0) {
- freeCompletions(&lc);
- return -1;
- }
-
- switch(c) {
- case 9: /* tab */
- i = (i+1) % (lc.len+1);
- if (i == lc.len) linenoiseBeep();
- break;
- case 27: /* escape */
- /* Re-show original buffer */
- if (i < lc.len) refreshLine(ls);
- stop = 1;
- break;
- default:
- /* Update buffer and return */
- if (i < lc.len) {
- nwritten = snprintf(ls->buf,ls->buflen,"%s",lc.cvec[i]);
- ls->len = ls->pos = nwritten;
- }
- stop = 1;
- break;
- }
- }
- }
-
- freeCompletions(&lc);
- return c; /* Return last read character */
-}
-
-/* Register a callback function to be called for tab-completion. */
-void linenoiseSetCompletionCallback(linenoiseCompletionCallback *fn) {
- completionCallback = fn;
-}
-
-/* Register a hits function to be called to show hits to the user at the
- * right of the prompt. */
-void linenoiseSetHintsCallback(linenoiseHintsCallback *fn) {
- hintsCallback = fn;
-}
-
-/* Register a function to free the hints returned by the hints callback
- * registered with linenoiseSetHintsCallback(). */
-void linenoiseSetFreeHintsCallback(linenoiseFreeHintsCallback *fn) {
- freeHintsCallback = fn;
-}
-
-/* This function is used by the callback function registered by the user
- * in order to add completion options given the input string when the
- * user typed <tab>. See the example.c source code for a very easy to
- * understand example. */
-void linenoiseAddCompletion(linenoiseCompletions *lc, const char *str) {
- size_t len = strlen(str);
- char *copy, **cvec;
-
- copy = malloc(len+1);
- if (copy == NULL) return;
- memcpy(copy,str,len+1);
- cvec = realloc(lc->cvec,sizeof(char*)*(lc->len+1));
- if (cvec == NULL) {
- free(copy);
- return;
- }
- lc->cvec = cvec;
- lc->cvec[lc->len++] = copy;
-}
-
-/* =========================== Line editing ================================= */
-
-/* We define a very simple "append buffer" structure, that is an heap
- * allocated string where we can append to. This is useful in order to
- * write all the escape sequences in a buffer and flush them to the standard
- * output in a single call, to avoid flickering effects. */
-struct abuf {
- char *b;
- int len;
-};
-
-static void abInit(struct abuf *ab) {
- ab->b = NULL;
- ab->len = 0;
-}
-
-static void abAppend(struct abuf *ab, const char *s, int len) {
- char *new = realloc(ab->b,ab->len+len);
-
- if (new == NULL) return;
- memcpy(new+ab->len,s,len);
- ab->b = new;
- ab->len += len;
-}
-
-static void abFree(struct abuf *ab) {
- free(ab->b);
-}
-
-/* Helper of refreshSingleLine() and refreshMultiLine() to show hints
- * to the right of the prompt. */
-void refreshShowHints(struct abuf *ab, struct linenoiseState *l, int plen) {
- char seq[64];
- if (hintsCallback && plen+l->len < l->cols) {
- int color = -1, bold = 0;
- char *hint = hintsCallback(l->buf,&color,&bold);
- if (hint) {
- int hintlen = strlen(hint);
- int hintmaxlen = l->cols-(plen+l->len);
- if (hintlen > hintmaxlen) hintlen = hintmaxlen;
- if (bold == 1 && color == -1) color = 37;
- if (color != -1 || bold != 0)
- snprintf(seq,64,"\033[%d;%d;49m",bold,color);
- else
- seq[0] = '\0';
- abAppend(ab,seq,strlen(seq));
- abAppend(ab,hint,hintlen);
- if (color != -1 || bold != 0)
- abAppend(ab,"\033[0m",4);
- /* Call the function to free the hint returned. */
- if (freeHintsCallback) freeHintsCallback(hint);
- }
- }
-}
-
-/* Single line low level line refresh.
- *
- * Rewrite the currently edited line accordingly to the buffer content,
- * cursor position, and number of columns of the terminal. */
-static void refreshSingleLine(struct linenoiseState *l) {
- char seq[64];
- size_t plen = strlen(l->prompt);
- int fd = l->ofd;
- char *buf = l->buf;
- size_t len = l->len;
- size_t pos = l->pos;
- struct abuf ab;
-
- while((plen+pos) >= l->cols) {
- buf++;
- len--;
- pos--;
- }
- while (plen+len > l->cols) {
- len--;
- }
-
- abInit(&ab);
- /* Cursor to left edge */
- snprintf(seq,64,"\r");
- abAppend(&ab,seq,strlen(seq));
- /* Write the prompt and the current buffer content */
- abAppend(&ab,l->prompt,strlen(l->prompt));
- abAppend(&ab,buf,len);
- /* Show hits if any. */
- refreshShowHints(&ab,l,plen);
- /* Erase to right */
- snprintf(seq,64,"\x1b[0K");
- abAppend(&ab,seq,strlen(seq));
- /* Move cursor to original position. */
- snprintf(seq,64,"\r\x1b[%dC", (int)(pos+plen));
- abAppend(&ab,seq,strlen(seq));
- if (write(fd,ab.b,ab.len) == -1) {} /* Can't recover from write error. */
- abFree(&ab);
-}
-
-/* Multi line low level line refresh.
- *
- * Rewrite the currently edited line accordingly to the buffer content,
- * cursor position, and number of columns of the terminal. */
-static void refreshMultiLine(struct linenoiseState *l) {
- char seq[64];
- int plen = strlen(l->prompt);
- int rows = (plen+l->len+l->cols-1)/l->cols; /* rows used by current buf. */
- int rpos = (plen+l->oldpos+l->cols)/l->cols; /* cursor relative row. */
- int rpos2; /* rpos after refresh. */
- int col; /* colum position, zero-based. */
- int old_rows = l->maxrows;
- int fd = l->ofd, j;
- struct abuf ab;
-
- /* Update maxrows if needed. */
- if (rows > (int)l->maxrows) l->maxrows = rows;
-
- /* First step: clear all the lines used before. To do so start by
- * going to the last row. */
- abInit(&ab);
- if (old_rows-rpos > 0) {
- lndebug("go down %d", old_rows-rpos);
- snprintf(seq,64,"\x1b[%dB", old_rows-rpos);
- abAppend(&ab,seq,strlen(seq));
- }
-
- /* Now for every row clear it, go up. */
- for (j = 0; j < old_rows-1; j++) {
- lndebug("clear+up");
- snprintf(seq,64,"\r\x1b[0K\x1b[1A");
- abAppend(&ab,seq,strlen(seq));
- }
-
- /* Clean the top line. */
- lndebug("clear");
- snprintf(seq,64,"\r\x1b[0K");
- abAppend(&ab,seq,strlen(seq));
-
- /* Write the prompt and the current buffer content */
- abAppend(&ab,l->prompt,strlen(l->prompt));
- abAppend(&ab,l->buf,l->len);
-
- /* Show hits if any. */
- refreshShowHints(&ab,l,plen);
-
- /* If we are at the very end of the screen with our prompt, we need to
- * emit a newline and move the prompt to the first column. */
- if (l->pos &&
- l->pos == l->len &&
- (l->pos+plen) % l->cols == 0)
- {
- lndebug("<newline>");
- abAppend(&ab,"\n",1);
- snprintf(seq,64,"\r");
- abAppend(&ab,seq,strlen(seq));
- rows++;
- if (rows > (int)l->maxrows) l->maxrows = rows;
- }
-
- /* Move cursor to right position. */
- rpos2 = (plen+l->pos+l->cols)/l->cols; /* current cursor relative row. */
- lndebug("rpos2 %d", rpos2);
-
- /* Go up till we reach the expected positon. */
- if (rows-rpos2 > 0) {
- lndebug("go-up %d", rows-rpos2);
- snprintf(seq,64,"\x1b[%dA", rows-rpos2);
- abAppend(&ab,seq,strlen(seq));
- }
-
- /* Set column. */
- col = (plen+(int)l->pos) % (int)l->cols;
- lndebug("set col %d", 1+col);
- if (col)
- snprintf(seq,64,"\r\x1b[%dC", col);
- else
- snprintf(seq,64,"\r");
- abAppend(&ab,seq,strlen(seq));
-
- lndebug("\n");
- l->oldpos = l->pos;
-
- if (write(fd,ab.b,ab.len) == -1) {} /* Can't recover from write error. */
- abFree(&ab);
-}
-
-/* Calls the two low level functions refreshSingleLine() or
- * refreshMultiLine() according to the selected mode. */
-static void refreshLine(struct linenoiseState *l) {
- if (mlmode)
- refreshMultiLine(l);
- else
- refreshSingleLine(l);
-}
-
-/* Insert the character 'c' at cursor current position.
- *
- * On error writing to the terminal -1 is returned, otherwise 0. */
-int linenoiseEditInsert(struct linenoiseState *l, char c) {
- if (l->len < l->buflen) {
- if (l->len == l->pos) {
- l->buf[l->pos] = c;
- l->pos++;
- l->len++;
- l->buf[l->len] = '\0';
- if ((!mlmode && l->plen+l->len < l->cols && !hintsCallback)) {
- /* Avoid a full update of the line in the
- * trivial case. */
- if (write(l->ofd,&c,1) == -1) return -1;
- } else {
- refreshLine(l);
- }
- } else {
- memmove(l->buf+l->pos+1,l->buf+l->pos,l->len-l->pos);
- l->buf[l->pos] = c;
- l->len++;
- l->pos++;
- l->buf[l->len] = '\0';
- refreshLine(l);
- }
- }
- return 0;
-}
-
-/* Move cursor on the left. */
-void linenoiseEditMoveLeft(struct linenoiseState *l) {
- if (l->pos > 0) {
- l->pos--;
- refreshLine(l);
- }
-}
-
-/* Move cursor on the right. */
-void linenoiseEditMoveRight(struct linenoiseState *l) {
- if (l->pos != l->len) {
- l->pos++;
- refreshLine(l);
- }
-}
-
-/* Move cursor to the start of the line. */
-void linenoiseEditMoveHome(struct linenoiseState *l) {
- if (l->pos != 0) {
- l->pos = 0;
- refreshLine(l);
- }
-}
-
-/* Move cursor to the end of the line. */
-void linenoiseEditMoveEnd(struct linenoiseState *l) {
- if (l->pos != l->len) {
- l->pos = l->len;
- refreshLine(l);
- }
-}
-
-/* Substitute the currently edited line with the next or previous history
- * entry as specified by 'dir'. */
-#define LINENOISE_HISTORY_NEXT 0
-#define LINENOISE_HISTORY_PREV 1
-void linenoiseEditHistoryNext(struct linenoiseState *l, int dir) {
- if (history_len > 1) {
- /* Update the current history entry before to
- * overwrite it with the next one. */
- free(history[history_len - 1 - l->history_index]);
- history[history_len - 1 - l->history_index] = strdup(l->buf);
- /* Show the new entry */
- l->history_index += (dir == LINENOISE_HISTORY_PREV) ? 1 : -1;
- if (l->history_index < 0) {
- l->history_index = 0;
- return;
- } else if (l->history_index >= history_len) {
- l->history_index = history_len-1;
- return;
- }
- strncpy(l->buf,history[history_len - 1 - l->history_index],l->buflen);
- l->buf[l->buflen-1] = '\0';
- l->len = l->pos = strlen(l->buf);
- refreshLine(l);
- }
-}
-
-/* Delete the character at the right of the cursor without altering the cursor
- * position. Basically this is what happens with the "Delete" keyboard key. */
-void linenoiseEditDelete(struct linenoiseState *l) {
- if (l->len > 0 && l->pos < l->len) {
- memmove(l->buf+l->pos,l->buf+l->pos+1,l->len-l->pos-1);
- l->len--;
- l->buf[l->len] = '\0';
- refreshLine(l);
- }
-}
-
-/* Backspace implementation. */
-void linenoiseEditBackspace(struct linenoiseState *l) {
- if (l->pos > 0 && l->len > 0) {
- memmove(l->buf+l->pos-1,l->buf+l->pos,l->len-l->pos);
- l->pos--;
- l->len--;
- l->buf[l->len] = '\0';
- refreshLine(l);
- }
-}
-
-/* Delete the previosu word, maintaining the cursor at the start of the
- * current word. */
-void linenoiseEditDeletePrevWord(struct linenoiseState *l) {
- size_t old_pos = l->pos;
- size_t diff;
-
- while (l->pos > 0 && l->buf[l->pos-1] == ' ')
- l->pos--;
- while (l->pos > 0 && l->buf[l->pos-1] != ' ')
- l->pos--;
- diff = old_pos - l->pos;
- memmove(l->buf+l->pos,l->buf+old_pos,l->len-old_pos+1);
- l->len -= diff;
- refreshLine(l);
-}
-
-/* This function is the core of the line editing capability of linenoise.
- * It expects 'fd' to be already in "raw mode" so that every key pressed
- * will be returned ASAP to read().
- *
- * The resulting string is put into 'buf' when the user type enter, or
- * when ctrl+d is typed.
- *
- * The function returns the length of the current buffer. */
-static int linenoiseEdit(int stdin_fd, int stdout_fd, char *buf, size_t buflen, const char *prompt)
-{
- struct linenoiseState l;
-
- /* Populate the linenoise state that we pass to functions implementing
- * specific editing functionalities. */
- l.ifd = stdin_fd;
- l.ofd = stdout_fd;
- l.buf = buf;
- l.buflen = buflen;
- l.prompt = prompt;
- l.plen = strlen(prompt);
- l.oldpos = l.pos = 0;
- l.len = 0;
- l.cols = getColumns(stdin_fd, stdout_fd);
- l.maxrows = 0;
- l.history_index = 0;
-
- /* Buffer starts empty. */
- l.buf[0] = '\0';
- l.buflen--; /* Make sure there is always space for the nulterm */
-
- /* The latest history entry is always our current buffer, that
- * initially is just an empty string. */
- linenoiseHistoryAdd("");
-
- if (write(l.ofd,prompt,l.plen) == -1) return -1;
- while(1) {
- char c;
- int nread;
- char seq[3];
-
- nread = read(l.ifd,&c,1);
- if (nread <= 0) return l.len;
-
- /* 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 == 9 && completionCallback != NULL) {
- c = completeLine(&l);
- /* Return on errors */
- if (c < 0) return l.len;
- /* Read next character when 0 */
- if (c == 0) continue;
- }
-
- switch(c) {
- case ENTER: /* enter */
- history_len--;
- free(history[history_len]);
- if (mlmode) linenoiseEditMoveEnd(&l);
- if (hintsCallback) {
- /* Force a refresh without hints to leave the previous
- * line as the user typed it after a newline. */
- linenoiseHintsCallback *hc = hintsCallback;
- hintsCallback = NULL;
- refreshLine(&l);
- hintsCallback = hc;
- }
- return (int)l.len;
- case CTRL_C: /* ctrl-c */
- errno = EAGAIN;
- return -1;
- case BACKSPACE: /* backspace */
- case 8: /* ctrl-h */
- linenoiseEditBackspace(&l);
- break;
- case CTRL_D: /* ctrl-d, remove char at right of cursor, or if the
- line is empty, act as end-of-file. */
- if (l.len > 0) {
- linenoiseEditDelete(&l);
- } else {
- history_len--;
- free(history[history_len]);
- return -1;
- }
- break;
- case CTRL_T: /* ctrl-t, swaps current character with previous. */
- if (l.pos > 0 && l.pos < l.len) {
- int aux = buf[l.pos-1];
- buf[l.pos-1] = buf[l.pos];
- buf[l.pos] = aux;
- if (l.pos != l.len-1) l.pos++;
- refreshLine(&l);
- }
- break;
- case CTRL_B: /* ctrl-b */
- linenoiseEditMoveLeft(&l);
- break;
- case CTRL_F: /* ctrl-f */
- linenoiseEditMoveRight(&l);
- break;
- case CTRL_P: /* ctrl-p */
- linenoiseEditHistoryNext(&l, LINENOISE_HISTORY_PREV);
- break;
- case CTRL_N: /* ctrl-n */
- linenoiseEditHistoryNext(&l, LINENOISE_HISTORY_NEXT);
- break;
- case ESC: /* escape sequence */
- /* Read the next two bytes representing the escape sequence.
- * Use two calls to handle slow terminals returning the two
- * chars at different times. */
- if (read(l.ifd,seq,1) == -1) break;
- if (read(l.ifd,seq+1,1) == -1) break;
-
- /* ESC [ sequences. */
- if (seq[0] == '[') {
- if (seq[1] >= '0' && seq[1] <= '9') {
- /* Extended escape, read additional byte. */
- if (read(l.ifd,seq+2,1) == -1) break;
- if (seq[2] == '~') {
- switch(seq[1]) {
- case '3': /* Delete key. */
- linenoiseEditDelete(&l);
- break;
- }
- }
- } else {
- switch(seq[1]) {
- case 'A': /* Up */
- linenoiseEditHistoryNext(&l, LINENOISE_HISTORY_PREV);
- break;
- case 'B': /* Down */
- linenoiseEditHistoryNext(&l, LINENOISE_HISTORY_NEXT);
- break;
- case 'C': /* Right */
- linenoiseEditMoveRight(&l);
- break;
- case 'D': /* Left */
- linenoiseEditMoveLeft(&l);
- break;
- case 'H': /* Home */
- linenoiseEditMoveHome(&l);
- break;
- case 'F': /* End*/
- linenoiseEditMoveEnd(&l);
- break;
- }
- }
- }
-
- /* ESC O sequences. */
- else if (seq[0] == 'O') {
- switch(seq[1]) {
- case 'H': /* Home */
- linenoiseEditMoveHome(&l);
- break;
- case 'F': /* End*/
- linenoiseEditMoveEnd(&l);
- break;
- }
- }
- break;
- default:
- if (linenoiseEditInsert(&l,c)) return -1;
- break;
- case CTRL_U: /* Ctrl+u, delete the whole line. */
- buf[0] = '\0';
- l.pos = l.len = 0;
- refreshLine(&l);
- break;
- case CTRL_K: /* Ctrl+k, delete from current to end of line. */
- buf[l.pos] = '\0';
- l.len = l.pos;
- refreshLine(&l);
- break;
- case CTRL_A: /* Ctrl+a, go to the start of the line */
- linenoiseEditMoveHome(&l);
- break;
- case CTRL_E: /* ctrl+e, go to the end of the line */
- linenoiseEditMoveEnd(&l);
- break;
- case CTRL_L: /* ctrl+l, clear screen */
- linenoiseClearScreen();
- refreshLine(&l);
- break;
- case CTRL_W: /* ctrl+w, delete previous word */
- linenoiseEditDeletePrevWord(&l);
- break;
- }
- }
- return l.len;
-}
-
-/* This special mode is used by linenoise in order to print scan codes
- * on screen for debugging / development purposes. It is implemented
- * by the linenoise_example program using the --keycodes option. */
-void linenoisePrintKeyCodes(void) {
- char quit[4];
-
- printf("Linenoise key codes debugging mode.\n"
- "Press keys to see scan codes. Type 'quit' at any time to exit.\n");
- if (enableRawMode(STDIN_FILENO) == -1) return;
- memset(quit,' ',4);
- while(1) {
- char c;
- int nread;
-
- nread = read(STDIN_FILENO,&c,1);
- if (nread <= 0) continue;
- memmove(quit,quit+1,sizeof(quit)-1); /* shift string to left. */
- quit[sizeof(quit)-1] = c; /* Insert current char on the right. */
- if (memcmp(quit,"quit",sizeof(quit)) == 0) break;
-
- printf("'%c' %02x (%d) (type quit to exit)\n",
- isprint(c) ? c : '?', (int)c, (int)c);
- printf("\r"); /* Go left edge manually, we are in raw mode. */
- fflush(stdout);
- }
- disableRawMode(STDIN_FILENO);
-}
-
-/* This function calls the line editing function linenoiseEdit() using
- * the STDIN file descriptor set in raw mode. */
-static int linenoiseRaw(char *buf, size_t buflen, const char *prompt) {
- int count;
-
- if (buflen == 0) {
- errno = EINVAL;
- return -1;
- }
-
- if (enableRawMode(STDIN_FILENO) == -1) return -1;
- count = linenoiseEdit(STDIN_FILENO, STDOUT_FILENO, buf, buflen, prompt);
- disableRawMode(STDIN_FILENO);
- printf("\n");
- return count;
-}
-
-/* This function is called when linenoise() is called with the standard
- * input file descriptor not attached to a TTY. So for example when the
- * program using linenoise is called in pipe or with a file redirected
- * to its standard input. In this case, we want to be able to return the
- * line regardless of its length (by default we are limited to 4k). */
-static char *linenoiseNoTTY(void) {
- char *line = NULL;
- size_t len = 0, maxlen = 0;
-
- while(1) {
- if (len == maxlen) {
- if (maxlen == 0) maxlen = 16;
- maxlen *= 2;
- char *oldval = line;
- line = realloc(line,maxlen);
- if (line == NULL) {
- if (oldval) free(oldval);
- return NULL;
- }
- }
- int c = fgetc(stdin);
- if (c == EOF || c == '\n') {
- if (c == EOF && len == 0) {
- free(line);
- return NULL;
- } else {
- line[len] = '\0';
- return line;
- }
- } else {
- line[len] = c;
- len++;
- }
- }
-}
-
-/* The high level function that is the main API of the linenoise library.
- * This function checks if the terminal has basic capabilities, just checking
- * for a blacklist of stupid terminals, and later either calls the line
- * editing function or uses dummy fgets() so that you will be able to type
- * something even in the most desperate of the conditions. */
-char *linenoise(const char *prompt) {
- char buf[LINENOISE_MAX_LINE];
- int count;
-
- if (!isatty(STDIN_FILENO)) {
- /* Not a tty: read from file / pipe. In this mode we don't want any
- * limit to the line size, so we call a function to handle that. */
- return linenoiseNoTTY();
- } else if (isUnsupportedTerm()) {
- size_t len;
-
- printf("%s",prompt);
- fflush(stdout);
- if (fgets(buf,LINENOISE_MAX_LINE,stdin) == NULL) return NULL;
- len = strlen(buf);
- while(len && (buf[len-1] == '\n' || buf[len-1] == '\r')) {
- len--;
- buf[len] = '\0';
- }
- return strdup(buf);
- } else {
- count = linenoiseRaw(buf,LINENOISE_MAX_LINE,prompt);
- if (count == -1) return NULL;
- return strdup(buf);
- }
-}
-
-/* This is just a wrapper the user may want to call in order to make sure
- * the linenoise returned buffer is freed with the same allocator it was
- * created with. Useful when the main program is using an alternative
- * allocator. */
-void linenoiseFree(void *ptr) {
- free(ptr);
-}
-
-/* ================================ History ================================= */
-
-/* Free the history, but does not reset it. Only used when we have to
- * exit() to avoid memory leaks are reported by valgrind & co. */
-static void freeHistory(void) {
- if (history) {
- int j;
-
- for (j = 0; j < history_len; j++)
- free(history[j]);
- free(history);
- }
-}
-
-/* At exit we'll try to fix the terminal to the initial conditions. */
-static void linenoiseAtExit(void) {
- disableRawMode(STDIN_FILENO);
- freeHistory();
-}
-
-/* This is the API call to add a new entry in the linenoise history.
- * It uses a fixed array of char pointers that are shifted (memmoved)
- * when the history max length is reached in order to remove the older
- * entry and make room for the new one, so it is not exactly suitable for huge
- * histories, but will work well for a few hundred of entries.
- *
- * 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;
-
- /* Initialization on first call. */
- if (history == NULL) {
- history = malloc(sizeof(char*)*history_max_len);
- if (history == NULL) return 0;
- memset(history,0,(sizeof(char*)*history_max_len));
- }
-
- /* Don't add duplicated lines. */
- if (history_len && !strcmp(history[history_len-1], line)) return 0;
-
- /* Add an heap allocated copy of the line in the history.
- * If we reached the max length, remove the older line. */
- 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;
-}
-
-/* Set the maximum length for the history. This function can be called even
- * if there is already some history, the function will make sure to retain
- * just the latest 'len' elements if the new history length value is smaller
- * than the amount of items already inside the history. */
-int linenoiseHistorySetMaxLen(int len) {
- char **new;
-
- if (len < 1) return 0;
- if (history) {
- int tocopy = history_len;
-
- new = malloc(sizeof(char*)*len);
- if (new == 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(new,0,sizeof(char*)*len);
- memcpy(new,history+(history_len-tocopy), sizeof(char*)*tocopy);
- free(history);
- history = new;
- }
- 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) {
- mode_t old_umask = umask(S_IXUSR|S_IRWXG|S_IRWXO);
- FILE *fp;
- int j;
-
- fp = fopen(filename,"w");
- umask(old_umask);
- if (fp == NULL) return -1;
- chmod(filename,S_IRUSR|S_IWUSR);
- for (j = 0; j < history_len; j++)
- fprintf(fp,"%s\n",history[j]);
- 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 *p;
-
- p = strchr(buf,'\r');
- if (!p) p = strchr(buf,'\n');
- if (p) *p = '\0';
- linenoiseHistoryAdd(buf);
- }
- fclose(fp);
- return 0;
-}