1226 lines
39 KiB
C
1226 lines
39 KiB
C
/* linenoise.c -- guerrilla line editing library against the idea that a
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* line editing lib needs to be 20,000 lines of C code.
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*
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* You can find the latest source code at:
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*
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* http://github.com/antirez/linenoise
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*
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* Does a number of crazy assumptions that happen to be true in 99.9999% of
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* the 2010 UNIX computers around.
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*
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* ------------------------------------------------------------------------
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*
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* Copyright (c) 2010-2016, Salvatore Sanfilippo <antirez at gmail dot com>
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* Copyright (c) 2010-2013, Pieter Noordhuis <pcnoordhuis at gmail dot com>
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*
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* ------------------------------------------------------------------------
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*
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* References:
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* - http://invisible-island.net/xterm/ctlseqs/ctlseqs.html
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* - http://www.3waylabs.com/nw/WWW/products/wizcon/vt220.html
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*
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* Todo list:
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* - Filter bogus Ctrl+<char> combinations.
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* - Win32 support
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*
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* Bloat:
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* - History search like Ctrl+r in readline?
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*
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* List of escape sequences used by this program, we do everything just
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* with three sequences. In order to be so cheap we may have some
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* flickering effect with some slow terminal, but the lesser sequences
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* the more compatible.
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*
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* EL (Erase Line)
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* Sequence: ESC [ n K
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* Effect: if n is 0 or missing, clear from cursor to end of line
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* Effect: if n is 1, clear from beginning of line to cursor
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* Effect: if n is 2, clear entire line
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*
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* CUF (CUrsor Forward)
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* Sequence: ESC [ n C
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* Effect: moves cursor forward n chars
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*
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* CUB (CUrsor Backward)
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* Sequence: ESC [ n D
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* Effect: moves cursor backward n chars
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*
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* The following is used to get the terminal width if getting
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* the width with the TIOCGWINSZ ioctl fails
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*
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* DSR (Device Status Report)
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* Sequence: ESC [ 6 n
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* Effect: reports the current cusor position as ESC [ n ; m R
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* where n is the row and m is the column
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*
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* When multi line mode is enabled, we also use an additional escape
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* sequence. However multi line editing is disabled by default.
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*
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* CUU (Cursor Up)
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* Sequence: ESC [ n A
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* Effect: moves cursor up of n chars.
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*
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* CUD (Cursor Down)
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* Sequence: ESC [ n B
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* Effect: moves cursor down of n chars.
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*
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* When linenoiseClearScreen() is called, two additional escape sequences
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* are used in order to clear the screen and position the cursor at home
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* position.
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*
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* CUP (Cursor position)
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* Sequence: ESC [ H
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* Effect: moves the cursor to upper left corner
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*
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* ED (Erase display)
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* Sequence: ESC [ 2 J
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* Effect: clear the whole screen
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*
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*/
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#include <termios.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <unistd.h>
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#include "linenoise.h"
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#define LINENOISE_DEFAULT_HISTORY_MAX_LEN 100
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#define LINENOISE_MAX_LINE 4096
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static char *unsupported_term[] = {"dumb","cons25","emacs",NULL};
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static linenoiseCompletionCallback *completionCallback = NULL;
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static linenoiseHintsCallback *hintsCallback = NULL;
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static linenoiseFreeHintsCallback *freeHintsCallback = NULL;
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static struct termios orig_termios; /* In order to restore at exit.*/
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static int maskmode = 0; /* Show "***" instead of input. For passwords. */
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static int rawmode = 0; /* For atexit() function to check if restore is needed*/
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static int mlmode = 0; /* Multi line mode. Default is single line. */
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static int atexit_registered = 0; /* Register atexit just 1 time. */
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static int history_max_len = LINENOISE_DEFAULT_HISTORY_MAX_LEN;
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static int history_len = 0;
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static char **history = NULL;
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/* The linenoiseState structure represents the state during line editing.
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* We pass this state to functions implementing specific editing
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* functionalities. */
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struct linenoiseState {
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int ifd; /* Terminal stdin file descriptor. */
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int ofd; /* Terminal stdout file descriptor. */
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char *buf; /* Edited line buffer. */
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size_t buflen; /* Edited line buffer size. */
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const char *prompt; /* Prompt to display. */
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size_t plen; /* Prompt length. */
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size_t pos; /* Current cursor position. */
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size_t oldpos; /* Previous refresh cursor position. */
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size_t len; /* Current edited line length. */
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size_t cols; /* Number of columns in terminal. */
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size_t maxrows; /* Maximum num of rows used so far (multiline mode) */
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int history_index; /* The history index we are currently editing. */
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};
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enum KEY_ACTION{
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KEY_NULL = 0, /* NULL */
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CTRL_A = 1, /* Ctrl+a */
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CTRL_B = 2, /* Ctrl-b */
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CTRL_C = 3, /* Ctrl-c */
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CTRL_D = 4, /* Ctrl-d */
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CTRL_E = 5, /* Ctrl-e */
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CTRL_F = 6, /* Ctrl-f */
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CTRL_H = 8, /* Ctrl-h */
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TAB = 9, /* Tab */
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CTRL_K = 11, /* Ctrl+k */
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CTRL_L = 12, /* Ctrl+l */
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ENTER = 13, /* Enter */
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CTRL_N = 14, /* Ctrl-n */
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CTRL_P = 16, /* Ctrl-p */
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CTRL_T = 20, /* Ctrl-t */
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CTRL_U = 21, /* Ctrl+u */
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CTRL_W = 23, /* Ctrl+w */
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ESC = 27, /* Escape */
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BACKSPACE = 127 /* Backspace */
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};
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static void linenoiseAtExit(void);
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int linenoiseHistoryAdd(const char *line);
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static void refreshLine(struct linenoiseState *l);
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/* Debugging macro. */
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#if 0
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FILE *lndebug_fp = NULL;
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#define lndebug(...) \
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do { \
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if (lndebug_fp == NULL) { \
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lndebug_fp = fopen("/tmp/lndebug.txt","a"); \
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fprintf(lndebug_fp, \
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"[%d %d %d] p: %d, rows: %d, rpos: %d, max: %d, oldmax: %d\n", \
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(int)l->len,(int)l->pos,(int)l->oldpos,plen,rows,rpos, \
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(int)l->maxrows,old_rows); \
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} \
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fprintf(lndebug_fp, ", " __VA_ARGS__); \
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fflush(lndebug_fp); \
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} while (0)
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#else
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#define lndebug(fmt, ...)
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#endif
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/* ======================= Low level terminal handling ====================== */
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/* Enable "mask mode". When it is enabled, instead of the input that
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* the user is typing, the terminal will just display a corresponding
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* number of asterisks, like "****". This is useful for passwords and other
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* secrets that should not be displayed. */
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void linenoiseMaskModeEnable(void) {
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maskmode = 1;
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}
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/* Disable mask mode. */
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void linenoiseMaskModeDisable(void) {
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maskmode = 0;
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}
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/* Set if to use or not the multi line mode. */
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void linenoiseSetMultiLine(int ml) {
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mlmode = ml;
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}
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/* Return true if the terminal name is in the list of terminals we know are
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* not able to understand basic escape sequences. */
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static int isUnsupportedTerm(void) {
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char *term = getenv("TERM");
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int j;
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if (term == NULL) return 0;
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for (j = 0; unsupported_term[j]; j++)
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if (!strcasecmp(term,unsupported_term[j])) return 1;
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return 0;
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}
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/* Raw mode: 1960 magic shit. */
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static int enableRawMode(int fd) {
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struct termios raw;
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if (!isatty(STDIN_FILENO)) goto fatal;
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if (!atexit_registered) {
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atexit(linenoiseAtExit);
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atexit_registered = 1;
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}
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if (tcgetattr(fd,&orig_termios) == -1) goto fatal;
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raw = orig_termios; /* modify the original mode */
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/* input modes: no break, no CR to NL, no parity check, no strip char,
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* no start/stop output control. */
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raw.c_iflag &= ~(BRKINT | ICRNL | INPCK | ISTRIP | IXON);
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/* output modes - disable post processing */
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raw.c_oflag &= ~(OPOST);
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/* control modes - set 8 bit chars */
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raw.c_cflag |= (CS8);
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/* local modes - choing off, canonical off, no extended functions,
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* no signal chars (^Z,^C) */
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raw.c_lflag &= ~(ECHO | ICANON | IEXTEN | ISIG);
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/* control chars - set return condition: min number of bytes and timer.
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* We want read to return every single byte, without timeout. */
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raw.c_cc[VMIN] = 1; raw.c_cc[VTIME] = 0; /* 1 byte, no timer */
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/* put terminal in raw mode after flushing */
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if (tcsetattr(fd,TCSAFLUSH,&raw) < 0) goto fatal;
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rawmode = 1;
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return 0;
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fatal:
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errno = ENOTTY;
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return -1;
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}
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static void disableRawMode(int fd) {
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/* Don't even check the return value as it's too late. */
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if (rawmode && tcsetattr(fd,TCSAFLUSH,&orig_termios) != -1)
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rawmode = 0;
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}
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/* Use the ESC [6n escape sequence to query the horizontal cursor position
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* and return it. On error -1 is returned, on success the position of the
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* cursor. */
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static int getCursorPosition(int ifd, int ofd) {
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char buf[32];
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int cols, rows;
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unsigned int i = 0;
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/* Report cursor location */
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if (write(ofd, "\x1b[6n", 4) != 4) return -1;
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/* Read the response: ESC [ rows ; cols R */
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while (i < sizeof(buf)-1) {
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if (read(ifd,buf+i,1) != 1) break;
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if (buf[i] == 'R') break;
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i++;
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}
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buf[i] = '\0';
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/* Parse it. */
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if (buf[0] != ESC || buf[1] != '[') return -1;
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if (sscanf(buf+2,"%d;%d",&rows,&cols) != 2) return -1;
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return cols;
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}
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/* Try to get the number of columns in the current terminal, or assume 80
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* if it fails. */
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static int getColumns(int ifd, int ofd) {
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struct winsize ws;
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if (ioctl(1, TIOCGWINSZ, &ws) == -1 || ws.ws_col == 0) {
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/* ioctl() failed. Try to query the terminal itself. */
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int start, cols;
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/* Get the initial position so we can restore it later. */
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start = getCursorPosition(ifd,ofd);
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if (start == -1) goto failed;
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/* Go to right margin and get position. */
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if (write(ofd,"\x1b[999C",6) != 6) goto failed;
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cols = getCursorPosition(ifd,ofd);
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if (cols == -1) goto failed;
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/* Restore position. */
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if (cols > start) {
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char seq[32];
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snprintf(seq,32,"\x1b[%dD",cols-start);
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if (write(ofd,seq,strlen(seq)) == -1) {
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/* Can't recover... */
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}
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}
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return cols;
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} else {
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return ws.ws_col;
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}
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failed:
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return 80;
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}
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/* Clear the screen. Used to handle ctrl+l */
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void linenoiseClearScreen(void) {
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if (write(STDOUT_FILENO,"\x1b[H\x1b[2J",7) <= 0) {
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/* nothing to do, just to avoid warning. */
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}
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}
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/* Beep, used for completion when there is nothing to complete or when all
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* the choices were already shown. */
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static void linenoiseBeep(void) {
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fprintf(stderr, "\x7");
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fflush(stderr);
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}
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/* ============================== Completion ================================ */
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/* Free a list of completion option populated by linenoiseAddCompletion(). */
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static void freeCompletions(linenoiseCompletions *lc) {
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size_t i;
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for (i = 0; i < lc->len; i++)
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free(lc->cvec[i]);
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if (lc->cvec != NULL)
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free(lc->cvec);
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}
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/* This is an helper function for linenoiseEdit() and is called when the
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* user types the <tab> key in order to complete the string currently in the
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* input.
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*
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* The state of the editing is encapsulated into the pointed linenoiseState
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* structure as described in the structure definition. */
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static int completeLine(struct linenoiseState *ls) {
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linenoiseCompletions lc = { 0, NULL };
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int nread, nwritten;
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char c = 0;
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completionCallback(ls->buf,&lc);
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if (lc.len == 0) {
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linenoiseBeep();
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} else {
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size_t stop = 0, i = 0;
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while(!stop) {
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/* Show completion or original buffer */
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if (i < lc.len) {
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struct linenoiseState saved = *ls;
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ls->len = ls->pos = strlen(lc.cvec[i]);
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ls->buf = lc.cvec[i];
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refreshLine(ls);
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ls->len = saved.len;
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ls->pos = saved.pos;
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ls->buf = saved.buf;
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} else {
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refreshLine(ls);
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}
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nread = read(ls->ifd,&c,1);
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if (nread <= 0) {
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freeCompletions(&lc);
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return -1;
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}
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switch(c) {
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case 9: /* tab */
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i = (i+1) % (lc.len+1);
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if (i == lc.len) linenoiseBeep();
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break;
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case 27: /* escape */
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/* Re-show original buffer */
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if (i < lc.len) refreshLine(ls);
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stop = 1;
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break;
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default:
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/* Update buffer and return */
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if (i < lc.len) {
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nwritten = snprintf(ls->buf,ls->buflen,"%s",lc.cvec[i]);
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ls->len = ls->pos = nwritten;
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}
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stop = 1;
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break;
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}
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}
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}
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freeCompletions(&lc);
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return c; /* Return last read character */
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}
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/* Register a callback function to be called for tab-completion. */
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void linenoiseSetCompletionCallback(linenoiseCompletionCallback *fn) {
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completionCallback = fn;
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}
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/* Register a hits function to be called to show hits to the user at the
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* right of the prompt. */
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void linenoiseSetHintsCallback(linenoiseHintsCallback *fn) {
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hintsCallback = fn;
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}
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|
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/* Register a function to free the hints returned by the hints callback
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* registered with linenoiseSetHintsCallback(). */
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void linenoiseSetFreeHintsCallback(linenoiseFreeHintsCallback *fn) {
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freeHintsCallback = fn;
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}
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|
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/* This function is used by the callback function registered by the user
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* in order to add completion options given the input string when the
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* user typed <tab>. See the example.c source code for a very easy to
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* understand example. */
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void linenoiseAddCompletion(linenoiseCompletions *lc, const char *str) {
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size_t len = strlen(str);
|
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char *copy, **cvec;
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|
|
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copy = malloc(len+1);
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if (copy == NULL) return;
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memcpy(copy,str,len+1);
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cvec = realloc(lc->cvec,sizeof(char*)*(lc->len+1));
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if (cvec == NULL) {
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free(copy);
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return;
|
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}
|
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lc->cvec = cvec;
|
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lc->cvec[lc->len++] = copy;
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}
|
|
|
|
/* =========================== Line editing ================================= */
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|
|
|
/* 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
|
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* write all the escape sequences in a buffer and flush them to the standard
|
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* output in a single call, to avoid flickering effects. */
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struct abuf {
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char *b;
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int len;
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};
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|
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static void abInit(struct abuf *ab) {
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ab->b = NULL;
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ab->len = 0;
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}
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static void abAppend(struct abuf *ab, const char *s, int len) {
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char *new = realloc(ab->b,ab->len+len);
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|
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if (new == NULL) return;
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memcpy(new+ab->len,s,len);
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ab->b = new;
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ab->len += len;
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}
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|
|
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static void abFree(struct abuf *ab) {
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free(ab->b);
|
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}
|
|
|
|
/* Helper of refreshSingleLine() and refreshMultiLine() to show hints
|
|
* to the right of the prompt. */
|
|
void refreshShowHints(struct abuf *ab, struct linenoiseState *l, int plen) {
|
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char seq[64];
|
|
if (hintsCallback && plen+l->len < l->cols) {
|
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int color = -1, bold = 0;
|
|
char *hint = hintsCallback(l->buf,&color,&bold);
|
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if (hint) {
|
|
int hintlen = strlen(hint);
|
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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));
|
|
if (maskmode == 1) {
|
|
while (len--) abAppend(&ab,"*",1);
|
|
} else {
|
|
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));
|
|
if (maskmode == 1) {
|
|
unsigned int i;
|
|
for (i = 0; i < l->len; i++) abAppend(&ab,"*",1);
|
|
} else {
|
|
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. */
|
|
char d = (maskmode==1) ? '*' : c;
|
|
if (write(l->ofd,&d,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;
|
|
}
|