mirror of
https://github.com/jart/cosmopolitan.git
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5029e20bef
Some progress has been made on introducing completion but there's been difficulties using the Python C API to get local shell variables.
1243 lines
51 KiB
C
1243 lines
51 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:4;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=4 sts=4 sw=4 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ 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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│ Copyright (c) 2018-2020, Justine Tunney <jtunney 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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│ CHANGES │
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│ │
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│ - Remove bell │
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│ - Windows support │
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│ - Filters out unsupported control sequences │
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│ - Filters out Thompson-Pike input sequences │
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│ │
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│ TODO │
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│ │
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│ - Kill ring │
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│ - History search │
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│ - Thompson-Pike Encoding │
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│ │
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│ REFERENCE │
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│ │
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│ The big scary coding you 𝘮𝘶𝘴𝘵 use curses to abstract. │
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│ │
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│ \t TAB │
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│ \a BELL │
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│ \r CURSOR START │
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│ \b CURSOR LEFT │
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│ \177 CURSOR LEFT │
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│ \n CURSOR DOWN AND START IF OPOST │
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│ \f CURSOR DOWN AND START IF OPOST │
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│ \v CURSOR DOWN AND START IF OPOST │
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│ \eD CURSOR DOWN AND START │
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│ \eE CURSOR DOWN │
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│ \eM CURSOR UP │
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│ \ec FULL RESET │
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│ \e7 SAVE CURSOR POSITION │
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│ \e8 RESTORE CURSOR POSITION │
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│ \e(0 DEC SPECIAL GRAPHICS │
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│ \e(B USAS X3.4-1967 │
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│ \e#5 SINGLE WIDTH │
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│ \e#6 DOUBLE WIDTH │
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│ \e#8 SO MANY E │
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│ \eZ → \e/Z REPORT IDENTITY │
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│ \e[𝑛A CURSOR UP [CLAMPED] │
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│ \e[𝑛B CURSOR DOWN [CLAMPED] │
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│ \e[𝑛C CURSOR RIGHT [CLAMPED] │
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│ \e[𝑛D CURSOR LEFT [CLAMPED] │
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│ \e[𝑦;𝑥H SET CURSOR POSITION [CLAMPED] │
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│ \e[𝑥G SET CURSOR COLUMN [CLAMPED] │
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│ \e[𝑦d SET CURSOR ROW [CLAMPED] │
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│ \e[𝑛E CURSOR DOWN AND START [CLAMPED] │
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│ \e[𝑛F CURSOR UP AND START [CLAMPED] │
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│ \e[𝑛S SCROLL UP │
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│ \e[𝑛T SCROLL DOWN │
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│ \e[𝑛@ INSERT CELLS │
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│ \e[𝑛P DELETE CELLS │
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│ \e[𝑛L INSERT LINES │
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│ \e[𝑛M DELETE LINES │
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│ \e[J ERASE DISPLAY FORWARDS │
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│ \e[1J ERASE DISPLAY BACKWARDS │
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│ \e[2J ERASE DISPLAY │
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│ \e[K ERASE LINE FORWARD │
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│ \e[1K ERASE LINE BACKWARD │
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│ \e[2K ERASE LINE │
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│ \e[𝑛X ERASE CELLS │
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│ \e[0m RESET │
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│ \e[1m BOLD │
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│ \e[2m FAINT │
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│ \e[3m ITALIC │
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│ \e[4m UNDER │
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│ \e[5m BLINK │
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│ \e[7m INVERT │
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│ \e[8m CONCEAL │
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│ \e[9m STRIKE │
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│ \e[20m FRAKTUR │
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│ \e[21m DUNDER │
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│ \e[22m RESET BOLD & FAINT │
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│ \e[23m RESET ITALIC & FRAKTUR │
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│ \e[24m RESET UNDER & DUNDER │
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│ \e[25m RESET BLINK │
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│ \e[27m RESET INVERT │
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│ \e[28m RESET CONCEAL │
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│ \e[29m RESET STRIKE │
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│ \e[39m RESET FOREGROUND │
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│ \e[49m RESET BACKGROUND │
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│ \e[30m BLACK FOREGROUND │
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│ \e[31m RED FOREGROUND │
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│ \e[32m GREEN FOREGROUND │
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│ \e[33m YELLOW FOREGROUND │
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│ \e[34m BLUE FOREGROUND │
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│ \e[35m MAGENTA FOREGROUND │
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│ \e[36m CYAN FOREGROUND │
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│ \e[37m WHITE FOREGROUND │
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│ \e[40m BLACK BACKGROUND │
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│ \e[41m RED BACKGROUND │
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│ \e[42m GREEN BACKGROUND │
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│ \e[44m YELLOW BACKGROUND │
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│ \e[44m BLUE BACKGROUND │
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│ \e[45m MAGENTA BACKGROUND │
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│ \e[46m CYAN BACKGROUND │
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│ \e[47m WHITE BACKGROUND │
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│ \e[90m BRIGHT BLACK FOREGROUND │
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│ \e[91m BRIGHT RED FOREGROUND │
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│ \e[92m BRIGHT GREEN FOREGROUND │
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│ \e[93m BRIGHT YELLOW FOREGROUND │
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│ \e[94m BRIGHT BLUE FOREGROUND │
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│ \e[95m BRIGHT MAGENTA FOREGROUND │
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│ \e[96m BRIGHT CYAN FOREGROUND │
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│ \e[97m BRIGHT WHITE FOREGROUND │
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│ \e[100m BRIGHT BLACK BACKGROUND │
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│ \e[101m BRIGHT RED BACKGROUND │
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│ \e[102m BRIGHT GREEN BACKGROUND │
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│ \e[103m BRIGHT YELLOW BACKGROUND │
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│ \e[104m BRIGHT BLUE BACKGROUND │
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│ \e[105m BRIGHT MAGENTA BACKGROUND │
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│ \e[106m BRIGHT CYAN BACKGROUND │
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│ \e[107m BRIGHT WHITE BACKGROUND │
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│ \e[38;5;𝑥m XTERM256 FOREGROUND │
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│ \e[48;5;𝑥m XTERM256 BACKGROUND │
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│ \e[38;2;𝑟;𝑔;𝑏m RGB FOREGROUND │
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│ \e[48;2;𝑟;𝑔;𝑏m RGB BACKGROUND │
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│ \e[?25h SHOW CURSOR │
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│ \e[?25l HIDE CURSOR │
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│ \e[s SAVE CURSOR POSITION │
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│ \e[u RESTORE CURSOR POSITION │
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│ \e[?5h ... \e[?5l REVERSE VIDEO EPILEPSY │
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│ \e[0q RESET LEDS │
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│ \e[1q TURN ON FIRST LED │
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│ \e[2q TURN ON SECOND LED │
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│ \e[3q TURN ON THIRD LED │
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│ \e[4q TURN ON FOURTH LED │
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│ \e[c → \e[?1;0c REPORT DEVICE TYPE │
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│ \e[5n → \e[0n REPORT DEVICE STATUS │
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│ \e[6n → \e[𝑦;𝑥R REPORT CURSOR POSITION │
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│ \e7\e[9979;9979H\e[6n\e8 → \e[𝑦;𝑥R REPORT DISPLAY DIMENSIONS │
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│ │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/calls.h"
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#include "libc/calls/termios.h"
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#include "libc/calls/ttydefaults.h"
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#include "libc/calls/weirdtypes.h"
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#include "libc/errno.h"
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#include "libc/fmt/fmt.h"
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#include "libc/runtime/gc.internal.h"
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#include "libc/runtime/runtime.h"
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#include "libc/stdio/stdio.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/fileno.h"
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#include "libc/x/x.h"
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#include "third_party/linenoise/linenoise.h"
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/* clang-format off */
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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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static void linenoiseAtExit(void);
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static void refreshLine(struct linenoiseState *);
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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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int j;
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char *term = getenv("TERM");
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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])) {
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return 1;
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}
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}
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return 0;
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}
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/* Raw mode: 1960's magic. */
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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 - echoing 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);
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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 */
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if (tcsetattr(fd,TCSANOW,&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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void linenoiseDisableRawMode(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, "\e[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] != '\e' || 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. */
|
||
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) {
|
||
/* 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,"\e[999C",6) != 6) goto failed;
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cols = getCursorPosition(ifd,ofd);
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if (cols == -1) goto failed;
|
||
/* Restore position. */
|
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if (cols > start) {
|
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char seq[32];
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snprintf(seq,32,"\e[%dD",cols-start);
|
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if (write(ofd,seq,strlen(seq)) == -1) {
|
||
/* Can't recover... */
|
||
}
|
||
}
|
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return cols;
|
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} else {
|
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return ws.ws_col;
|
||
}
|
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failed:
|
||
return 80;
|
||
}
|
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|
||
/* Clear the screen. Used to handle ctrl+l */
|
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void linenoiseClearScreen(void) {
|
||
if (write(STDOUT_FILENO,"\e[H\e[2J",7) <= 0) {
|
||
/* nothing to do, just to avoid warning. */
|
||
}
|
||
}
|
||
|
||
/* 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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/* NOOOO */
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||
/* fprintf(stderr, "\x7"); */
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||
fflush(stderr);
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||
}
|
||
|
||
/* ============================== Completion ================================ */
|
||
|
||
/* Free a list of completion option populated by linenoiseAddCompletion(). */
|
||
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]);
|
||
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 '\t':
|
||
i = (i+1) % (lc.len+1);
|
||
if (i == lc.len) linenoiseBeep();
|
||
break;
|
||
case '\e':
|
||
/* 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,"\e[%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,"\e[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,"\e[0K");
|
||
abAppend(&ab,seq,strlen(seq));
|
||
/* Move cursor to original position. */
|
||
snprintf(seq,64,"\r\e[%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,"\e[%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\e[0K\e[1A");
|
||
abAppend(&ab,seq,strlen(seq));
|
||
}
|
||
/* Clean the top line. */
|
||
lndebug("clear");
|
||
snprintf(seq,64,"\r\e[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,"\e[%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\e[%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 left. */
|
||
void linenoiseEditMoveLeftWord(struct linenoiseState *l) {
|
||
if (l->pos > 0) {
|
||
while (l->pos > 0 && l->buf[l->pos-1] == ' ')
|
||
l->pos--;
|
||
while (l->pos > 0 && l->buf[l->pos-1] != ' ')
|
||
l->pos--;
|
||
refreshLine(l);
|
||
}
|
||
}
|
||
|
||
/* Move cursor on the right. */
|
||
void linenoiseEditMoveRightWord(struct linenoiseState *l) {
|
||
if (l->pos != l->len) {
|
||
while (l->pos < l->len && l->buf[l->pos] == ' ')
|
||
l->pos++;
|
||
while (l->pos < l->len && l->buf[l->pos] != ' ')
|
||
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) {
|
||
int i;
|
||
int c;
|
||
int nread;
|
||
char seq[32];
|
||
nread = readansi(l.ifd,seq,sizeof(seq));
|
||
if (nread <= 0) return l.len;
|
||
c = seq[0];
|
||
/* Only autocomplete when the callback is set. It returns < 0 when
|
||
* there was an error reading from fd. Otherwise it will return the
|
||
* character that should be handled next. */
|
||
if (c == '\t' && completionCallback) {
|
||
c = completeLine(&l);
|
||
/* Return on errors */
|
||
if (c < 0) return l.len;
|
||
/* Read next character when 0 */
|
||
if (c == 0) continue;
|
||
}
|
||
switch(c) {
|
||
case '\r': /* 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'):
|
||
errno = EAGAIN;
|
||
return -1;
|
||
case CTRL('?'): /* backspace a.k.a. 0177 a.k.a. 127 */
|
||
case CTRL('H'):
|
||
linenoiseEditBackspace(&l);
|
||
break;
|
||
case 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'): /* 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'):
|
||
linenoiseEditMoveLeft(&l);
|
||
break;
|
||
case CTRL('F'):
|
||
linenoiseEditMoveRight(&l);
|
||
break;
|
||
case CTRL('P'):
|
||
linenoiseEditHistoryNext(&l, LINENOISE_HISTORY_PREV);
|
||
break;
|
||
case CTRL('N'):
|
||
linenoiseEditHistoryNext(&l, LINENOISE_HISTORY_NEXT);
|
||
break;
|
||
case '\e': /* 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 (nread < 2) break;
|
||
if (seq[1] == '[') {
|
||
if (nread < 3) break;
|
||
if (seq[2] >= '0' && seq[2] <= '9') {
|
||
if (nread < 4) break;
|
||
if (seq[3] == '~') {
|
||
switch(seq[2]) {
|
||
case '1': /* "\e[1~" is home */
|
||
linenoiseEditMoveHome(&l);
|
||
break;
|
||
case '3': /* "\e[3~" is delete */
|
||
linenoiseEditDelete(&l);
|
||
break;
|
||
case '4': /* "\e[4~" is end */
|
||
linenoiseEditMoveEnd(&l);
|
||
break;
|
||
}
|
||
}
|
||
} else {
|
||
switch(seq[2]) {
|
||
case 'A': /* "\e[A" is up */
|
||
linenoiseEditHistoryNext(&l, LINENOISE_HISTORY_PREV);
|
||
break;
|
||
case 'B': /* "\e[B" is down */
|
||
linenoiseEditHistoryNext(&l, LINENOISE_HISTORY_NEXT);
|
||
break;
|
||
case 'C': /* "\e[C" is right */
|
||
linenoiseEditMoveRight(&l);
|
||
break;
|
||
case 'D': /* "\e[D" is left */
|
||
linenoiseEditMoveLeft(&l);
|
||
break;
|
||
case 'H': /* "\e[H" is home */
|
||
linenoiseEditMoveHome(&l);
|
||
break;
|
||
case 'F': /* "\e[F" is end */
|
||
linenoiseEditMoveEnd(&l);
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
else if (seq[1] == 'O') {
|
||
if (nread < 3) break;
|
||
switch(seq[2]) {
|
||
case 'H': /* "\eOH" is home */
|
||
linenoiseEditMoveHome(&l);
|
||
break;
|
||
case 'F': /* "\eOF" is end */
|
||
linenoiseEditMoveEnd(&l);
|
||
break;
|
||
}
|
||
}
|
||
else if (seq[1] == 'b') { /* "\eb" is alt-b */
|
||
linenoiseEditMoveLeftWord(&l);
|
||
} else if (seq[1] == 'f') { /* "\ef" is alt-f */
|
||
linenoiseEditMoveRightWord(&l);
|
||
}
|
||
break;
|
||
default:
|
||
if (32 <= seq[0] && seq[0] < 127) {
|
||
if (linenoiseEditInsert(&l,seq[0])==-1) {
|
||
return -1;
|
||
}
|
||
}
|
||
break;
|
||
case CTRL('U'): /* delete the whole line */
|
||
/* TODO(jart): delete backwards */
|
||
buf[0] = '\0';
|
||
l.pos = l.len = 0;
|
||
refreshLine(&l);
|
||
break;
|
||
case CTRL('K'): /* delete from current to end of line */
|
||
/* TODO(jart): add to kill ring */
|
||
buf[l.pos] = '\0';
|
||
l.len = l.pos;
|
||
refreshLine(&l);
|
||
break;
|
||
case CTRL('A'): /* go to the start of the line */
|
||
linenoiseEditMoveHome(&l);
|
||
break;
|
||
case CTRL('E'): /* go to the end of the line */
|
||
linenoiseEditMoveEnd(&l);
|
||
break;
|
||
case CTRL('L'): /* clear screen */
|
||
linenoiseClearScreen();
|
||
refreshLine(&l);
|
||
break;
|
||
case 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);
|
||
}
|
||
linenoiseDisableRawMode(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);
|
||
linenoiseDisableRawMode(STDIN_FILENO);
|
||
if (count != -1) 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) {
|
||
int count;
|
||
char *buf;
|
||
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()) {
|
||
printf("%s",prompt);
|
||
fflush(stdout);
|
||
return chomp(xgetline(stdin));
|
||
} else {
|
||
buf = malloc(LINENOISE_MAX_LINE);
|
||
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);
|
||
}
|
||
|
||
/* 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) {
|
||
linenoiseDisableRawMode(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;
|
||
}
|