1317 lines
40 KiB
C
1317 lines
40 KiB
C
/* Kilo -- A very simple editor in less than 1-kilo lines of code (as counted
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* by "cloc"). Does not depend on libcurses, directly emits VT100
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* escapes on the terminal.
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*
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* -----------------------------------------------------------------------
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*
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* Copyright (C) 2016 Salvatore Sanfilippo <antirez 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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#define KILO_VERSION "0.0.1"
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#ifdef __linux__
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#define _POSIX_C_SOURCE 200809L
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#endif
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#include <termios.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <stdint.h>
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#include <errno.h>
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#include <string.h>
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#include <ctype.h>
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#include <time.h>
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/time.h>
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#include <unistd.h>
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#include <stdarg.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <stdio.h>
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#include "lua.h"
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/* Syntax highlight types */
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#define HL_NORMAL 0
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#define HL_NONPRINT 1
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#define HL_COMMENT 2 /* Single line comment. */
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#define HL_MLCOMMENT 3 /* Multi-line comment. */
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#define HL_KEYWORD1 4
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#define HL_KEYWORD2 5
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#define HL_STRING 6
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#define HL_NUMBER 7
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#define HL_MATCH 8 /* Search match. */
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#define HL_HIGHLIGHT_STRINGS (1<<0)
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#define HL_HIGHLIGHT_NUMBERS (1<<1)
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struct editorSyntax {
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char **keywords;
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char singleline_comment_start[2];
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char *multiline_comment_start;
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char *multiline_comment_end;
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int flags;
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};
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/* This structure represents a single line of the file we are editing. */
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typedef struct erow {
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int idx; /* Row index in the file, zero-based. */
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int size; /* Size of the row, excluding the null term. */
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int rsize; /* Size of the rendered row. */
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char *chars; /* Row content. */
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char *render; /* Row content "rendered" for screen (for TABs). */
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unsigned char *hl; /* Syntax highlight type for each character in render.*/
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int hl_oc; /* Row had open comment at end in last syntax highlight
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check. */
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} erow;
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typedef struct hlcolor {
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int r,g,b;
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} hlcolor;
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struct editorConfig {
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int cx,cy; /* Cursor x and y position in characters */
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int rowoff; /* Offset of row displayed. */
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int coloff; /* Offset of column displayed. */
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int screenrows; /* Number of rows that we can show */
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int screencols; /* Number of cols that we can show */
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int numrows; /* Number of rows */
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int rawmode; /* Is terminal raw mode enabled? */
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erow *row; /* Rows */
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int dirty; /* File modified but not saved. */
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char *filename; /* Currently open filename */
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char statusmsg[80];
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time_t statusmsg_time;
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struct editorSyntax *syntax; /* Current syntax highlight, or NULL. */
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};
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static struct editorConfig E;
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enum KEY_ACTION{
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KEY_NULL = 0,
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CTRL_C = 3,
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CTRL_D = 4,
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CTRL_E = 5,
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CTRL_F = 6,
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CTRL_H = 8,
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TAB = 9,
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CTRL_L = 12,
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ENTER = 13,
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CTRL_Q = 17,
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CTRL_S = 19,
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CTRL_U = 21,
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CTRL_X = 24,
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ESC = 27,
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BACKSPACE = 127,
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/* The following are just soft codes, not really reported by the
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* terminal directly. */
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ARROW_LEFT = 1000,
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ARROW_RIGHT,
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ARROW_UP,
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ARROW_DOWN,
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DEL_KEY,
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HOME_KEY,
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END_KEY,
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PAGE_UP,
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PAGE_DOWN
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};
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void editorSetStatusMessage(const char *fmt, ...);
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/* =========================== Syntax highlights DB =========================
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*
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* In order to add a new syntax, define two arrays with a list of file name
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* matches and keywords. The file name matches are used in order to match
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* a given syntax with a given file name: if a match pattern starts with a
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* dot, it is matched as the last past of the filename, for example ".c".
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* Otherwise the pattern is just searched inside the filenme, like "Makefile").
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*
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* The list of keywords to highlight is just a list of words, however if they
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* a trailing '|' character is added at the end, they are highlighted in
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* a different color, so that you can have two different sets of keywords.
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*
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* Finally add a stanza in the HLDB global variable with two two arrays
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* of strings, and a set of flags in order to enable highlighting of
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* comments and numbers.
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*
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* The characters for single and multi line comments must be exactly two
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* and must be provided as well (see the C language example).
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*
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* There is no support to highlight patterns currently. */
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/* Lua */
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char *Lua_HL_keywords[] = {
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/* keywords */
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"do", "end", "function", "return", "require", "local"
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"if", "then", "else", "elseif",
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"while", "for", "repeat", "until", "break",
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"and", "or", "not", "in",
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/* types */
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"nil", "false", "true",
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NULL
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};
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/* Here we define an array of syntax highlights by extensions, keywords,
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* comments delimiters and flags. */
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struct editorSyntax HLDB[] = {
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{
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Lua_HL_keywords,
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"--", "--[[", "--]]",
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HL_HIGHLIGHT_STRINGS | HL_HIGHLIGHT_NUMBERS
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}
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};
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#define HLDB_ENTRIES (sizeof(HLDB)/sizeof(HLDB[0]))
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/* ======================= Low level terminal handling ====================== */
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static struct termios orig_termios; /* In order to restore at exit.*/
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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 (E.rawmode) {
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tcsetattr(fd,TCSAFLUSH,&orig_termios);
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E.rawmode = 0;
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}
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}
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/* Called at exit to avoid remaining in raw mode. */
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void editorAtExit(void) {
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disableRawMode(STDIN_FILENO);
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}
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/* Raw mode: 1960 magic shit. */
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int enableRawMode(int fd) {
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struct termios raw;
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if (E.rawmode) return 0; /* Already enabled. */
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if (!isatty(STDIN_FILENO)) goto fatal;
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atexit(editorAtExit);
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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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raw.c_cc[VMIN] = 0; /* Return each byte, or zero for timeout. */
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raw.c_cc[VTIME] = 1; /* 100 ms timeout (unit is tens of second). */
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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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E.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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/* Read a key from the terminal put in raw mode, trying to handle
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* escape sequences. */
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int editorReadKey(int fd) {
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int nread;
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char c, seq[3];
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while ((nread = read(fd,&c,1)) == 0);
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if (nread == -1) exit(1);
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while(1) {
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switch(c) {
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case ESC: /* escape sequence */
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/* If this is just an ESC, we'll timeout here. */
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if (read(fd,seq,1) == 0) return ESC;
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if (read(fd,seq+1,1) == 0) return ESC;
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/* ESC [ sequences. */
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if (seq[0] == '[') {
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if (seq[1] >= '0' && seq[1] <= '9') {
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/* Extended escape, read additional byte. */
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if (read(fd,seq+2,1) == 0) return ESC;
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if (seq[2] == '~') {
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switch(seq[1]) {
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case '3': return DEL_KEY;
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case '5': return PAGE_UP;
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case '6': return PAGE_DOWN;
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}
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}
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} else {
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switch(seq[1]) {
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case 'A': return ARROW_UP;
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case 'B': return ARROW_DOWN;
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case 'C': return ARROW_RIGHT;
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case 'D': return ARROW_LEFT;
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case 'H': return HOME_KEY;
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case 'F': return END_KEY;
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}
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}
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}
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/* ESC O sequences. */
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else if (seq[0] == 'O') {
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switch(seq[1]) {
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case 'H': return HOME_KEY;
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case 'F': return END_KEY;
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}
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}
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break;
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default:
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return c;
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}
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}
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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 is stored at *rows and *cols and 0 is returned. */
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int getCursorPosition(int ifd, int ofd, int *rows, int *cols) {
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char buf[32];
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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 0;
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}
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/* Try to get the number of columns in the current terminal. If the ioctl()
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* call fails the function will try to query the terminal itself.
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* Returns 0 on success, -1 on error. */
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int getWindowSize(int ifd, int ofd, int *rows, int *cols) {
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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 orig_row, orig_col, retval;
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/* Get the initial position so we can restore it later. */
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retval = getCursorPosition(ifd,ofd,&orig_row,&orig_col);
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if (retval == -1) goto failed;
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/* Go to right/bottom margin and get position. */
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if (write(ofd,"\x1b[999C\x1b[999B",12) != 12) goto failed;
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retval = getCursorPosition(ifd,ofd,rows,cols);
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if (retval == -1) goto failed;
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/* Restore position. */
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char seq[32];
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snprintf(seq,32,"\x1b[%d;%dH",orig_row,orig_col);
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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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return 0;
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} else {
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*cols = ws.ws_col;
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*rows = ws.ws_row;
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return 0;
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}
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failed:
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return -1;
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}
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/* ====================== Syntax highlight color scheme ==================== */
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int is_separator(int c) {
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return c == '\0' || isspace(c) || strchr(",.()+-/*=~%[];",c) != NULL;
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}
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/* Return true if the specified row last char is part of a multi line comment
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* that starts at this row or at one before, and does not end at the end
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* of the row but spawns to the next row. */
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int editorRowHasOpenComment(erow *row) {
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if (row->hl && row->rsize && row->hl[row->rsize-1] == HL_MLCOMMENT &&
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(row->rsize < 2 || (row->render[row->rsize-2] != '*' ||
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row->render[row->rsize-1] != '/'))) return 1;
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return 0;
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}
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/* Set every byte of row->hl (that corresponds to every character in the line)
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* to the right syntax highlight type (HL_* defines). */
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void editorUpdateSyntax(erow *row) {
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row->hl = realloc(row->hl,row->rsize);
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memset(row->hl,HL_NORMAL,row->rsize);
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if (E.syntax == NULL) return; /* No syntax, everything is HL_NORMAL. */
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int i, prev_sep, in_string, in_comment;
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char *p;
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char **keywords = E.syntax->keywords;
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char *scs = E.syntax->singleline_comment_start;
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char *mcs = E.syntax->multiline_comment_start;
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char *mce = E.syntax->multiline_comment_end;
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/* Point to the first non-space char. */
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p = row->render;
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i = 0; /* Current char offset */
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while(*p && isspace(*p)) {
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p++;
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i++;
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}
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prev_sep = 1; /* Tell the parser if 'i' points to start of word. */
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in_string = 0; /* Are we inside "" or '' ? */
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in_comment = 0; /* Are we inside multi-line comment? */
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/* If the previous line has an open comment, this line starts
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* with an open comment state. */
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if (row->idx > 0 && editorRowHasOpenComment(&E.row[row->idx-1]))
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in_comment = 1;
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while(*p) {
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/* Handle // comments. */
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if (prev_sep && *p == scs[0] && *(p+1) == scs[1]) {
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/* From here to end is a comment */
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memset(row->hl+i,HL_COMMENT,row->size-i);
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return;
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}
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/* Handle multi line comments. */
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if (in_comment) {
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row->hl[i] = HL_MLCOMMENT;
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if (*p == mce[0] && *(p+1) == mce[1]) {
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row->hl[i+1] = HL_MLCOMMENT;
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p += 2; i += 2;
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in_comment = 0;
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prev_sep = 1;
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continue;
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} else {
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prev_sep = 0;
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p++; i++;
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continue;
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}
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} else if (*p == mcs[0] && *(p+1) == mcs[1]) {
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row->hl[i] = HL_MLCOMMENT;
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row->hl[i+1] = HL_MLCOMMENT;
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p += 2; i += 2;
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in_comment = 1;
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prev_sep = 0;
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continue;
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}
|
|
|
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/* Handle "" and '' */
|
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if (in_string) {
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row->hl[i] = HL_STRING;
|
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if (*p == '\\') {
|
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row->hl[i+1] = HL_STRING;
|
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p += 2; i += 2;
|
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prev_sep = 0;
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continue;
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}
|
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if (*p == in_string) in_string = 0;
|
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p++; i++;
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continue;
|
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} else {
|
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if (*p == '"' || *p == '\'') {
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in_string = *p;
|
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row->hl[i] = HL_STRING;
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p++; i++;
|
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prev_sep = 0;
|
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continue;
|
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}
|
|
}
|
|
|
|
/* Handle non printable chars. */
|
|
if (!isprint(*p)) {
|
|
row->hl[i] = HL_NONPRINT;
|
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p++; i++;
|
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prev_sep = 0;
|
|
continue;
|
|
}
|
|
|
|
/* Handle numbers */
|
|
if ((isdigit(*p) && (prev_sep || row->hl[i-1] == HL_NUMBER)) ||
|
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(*p == '.' && i >0 && row->hl[i-1] == HL_NUMBER)) {
|
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row->hl[i] = HL_NUMBER;
|
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p++; i++;
|
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prev_sep = 0;
|
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continue;
|
|
}
|
|
|
|
/* Handle keywords and lib calls */
|
|
if (prev_sep) {
|
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int j;
|
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for (j = 0; keywords[j]; j++) {
|
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int klen = strlen(keywords[j]);
|
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int kw2 = keywords[j][klen-1] == '|';
|
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if (kw2) klen--;
|
|
|
|
if (!memcmp(p,keywords[j],klen) &&
|
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is_separator(*(p+klen)))
|
|
{
|
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/* Keyword */
|
|
memset(row->hl+i,kw2 ? HL_KEYWORD2 : HL_KEYWORD1,klen);
|
|
p += klen;
|
|
i += klen;
|
|
break;
|
|
}
|
|
}
|
|
if (keywords[j] != NULL) {
|
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prev_sep = 0;
|
|
continue; /* We had a keyword match */
|
|
}
|
|
}
|
|
|
|
/* Not special chars */
|
|
prev_sep = is_separator(*p);
|
|
p++; i++;
|
|
}
|
|
|
|
/* Propagate syntax change to the next row if the open commen
|
|
* state changed. This may recursively affect all the following rows
|
|
* in the file. */
|
|
int oc = editorRowHasOpenComment(row);
|
|
if (row->hl_oc != oc && row->idx+1 < E.numrows)
|
|
editorUpdateSyntax(&E.row[row->idx+1]);
|
|
row->hl_oc = oc;
|
|
}
|
|
|
|
/* Maps syntax highlight token types to terminal colors. */
|
|
int editorSyntaxToColor(int hl) {
|
|
switch(hl) {
|
|
case HL_COMMENT:
|
|
case HL_MLCOMMENT: return 36; /* cyan */
|
|
case HL_KEYWORD1: return 33; /* yellow */
|
|
case HL_KEYWORD2: return 32; /* green */
|
|
case HL_STRING: return 35; /* magenta */
|
|
case HL_NUMBER: return 31; /* red */
|
|
case HL_MATCH: return 34; /* blu */
|
|
default: return 37; /* white */
|
|
}
|
|
}
|
|
|
|
/* ======================= Editor rows implementation ======================= */
|
|
|
|
/* Update the rendered version and the syntax highlight of a row. */
|
|
void editorUpdateRow(erow *row) {
|
|
unsigned int tabs = 0, nonprint = 0;
|
|
int j, idx;
|
|
|
|
/* Create a version of the row we can directly print on the screen,
|
|
* respecting tabs, substituting non printable characters with '?'. */
|
|
free(row->render);
|
|
for (j = 0; j < row->size; j++)
|
|
if (row->chars[j] == TAB) tabs++;
|
|
|
|
unsigned long long allocsize =
|
|
(unsigned long long) row->size + tabs*8 + nonprint*9 + 1;
|
|
if (allocsize > UINT32_MAX) {
|
|
printf("Some line of the edited file is too long for kilo\n");
|
|
exit(1);
|
|
}
|
|
|
|
row->render = malloc(row->size + tabs*8 + nonprint*9 + 1);
|
|
idx = 0;
|
|
for (j = 0; j < row->size; j++) {
|
|
if (row->chars[j] == TAB) {
|
|
row->render[idx++] = ' ';
|
|
while((idx+1) % 8 != 0) row->render[idx++] = ' ';
|
|
} else {
|
|
row->render[idx++] = row->chars[j];
|
|
}
|
|
}
|
|
row->rsize = idx;
|
|
row->render[idx] = '\0';
|
|
|
|
/* Update the syntax highlighting attributes of the row. */
|
|
editorUpdateSyntax(row);
|
|
}
|
|
|
|
/* Insert a row at the specified position, shifting the other rows on the bottom
|
|
* if required. */
|
|
void editorInsertRow(int at, char *s, size_t len) {
|
|
if (at > E.numrows) return;
|
|
E.row = realloc(E.row,sizeof(erow)*(E.numrows+1));
|
|
if (at != E.numrows) {
|
|
memmove(E.row+at+1,E.row+at,sizeof(E.row[0])*(E.numrows-at));
|
|
for (int j = at+1; j <= E.numrows; j++) E.row[j].idx++;
|
|
}
|
|
E.row[at].size = len;
|
|
E.row[at].chars = malloc(len+1);
|
|
memcpy(E.row[at].chars,s,len+1);
|
|
E.row[at].hl = NULL;
|
|
E.row[at].hl_oc = 0;
|
|
E.row[at].render = NULL;
|
|
E.row[at].rsize = 0;
|
|
E.row[at].idx = at;
|
|
editorUpdateRow(E.row+at);
|
|
E.numrows++;
|
|
E.dirty++;
|
|
}
|
|
|
|
/* Free row's heap allocated stuff. */
|
|
void editorFreeRow(erow *row) {
|
|
free(row->render);
|
|
free(row->chars);
|
|
free(row->hl);
|
|
}
|
|
|
|
/* Remove the row at the specified position, shifting the remainign on the
|
|
* top. */
|
|
void editorDelRow(int at) {
|
|
erow *row;
|
|
|
|
if (at >= E.numrows) return;
|
|
row = E.row+at;
|
|
editorFreeRow(row);
|
|
memmove(E.row+at,E.row+at+1,sizeof(E.row[0])*(E.numrows-at-1));
|
|
for (int j = at; j < E.numrows-1; j++) E.row[j].idx++;
|
|
E.numrows--;
|
|
E.dirty++;
|
|
}
|
|
|
|
/* Turn the editor rows into a single heap-allocated string.
|
|
* Returns the pointer to the heap-allocated string and populate the
|
|
* integer pointed by 'buflen' with the size of the string, escluding
|
|
* the final nulterm. */
|
|
char *editorRowsToString(int *buflen) {
|
|
char *buf = NULL, *p;
|
|
int totlen = 0;
|
|
int j;
|
|
|
|
/* Compute count of bytes */
|
|
for (j = 0; j < E.numrows; j++)
|
|
totlen += E.row[j].size+1; /* +1 is for "\n" at end of every row */
|
|
*buflen = totlen;
|
|
totlen++; /* Also make space for nulterm */
|
|
|
|
p = buf = malloc(totlen);
|
|
for (j = 0; j < E.numrows; j++) {
|
|
memcpy(p,E.row[j].chars,E.row[j].size);
|
|
p += E.row[j].size;
|
|
*p = '\n';
|
|
p++;
|
|
}
|
|
*p = '\0';
|
|
return buf;
|
|
}
|
|
|
|
/* Insert a character at the specified position in a row, moving the remaining
|
|
* chars on the right if needed. */
|
|
void editorRowInsertChar(erow *row, int at, int c) {
|
|
if (at > row->size) {
|
|
/* Pad the string with spaces if the insert location is outside the
|
|
* current length by more than a single character. */
|
|
int padlen = at-row->size;
|
|
/* In the next line +2 means: new char and null term. */
|
|
row->chars = realloc(row->chars,row->size+padlen+2);
|
|
memset(row->chars+row->size,' ',padlen);
|
|
row->chars[row->size+padlen+1] = '\0';
|
|
row->size += padlen+1;
|
|
} else {
|
|
/* If we are in the middle of the string just make space for 1 new
|
|
* char plus the (already existing) null term. */
|
|
row->chars = realloc(row->chars,row->size+2);
|
|
memmove(row->chars+at+1,row->chars+at,row->size-at+1);
|
|
row->size++;
|
|
}
|
|
row->chars[at] = c;
|
|
editorUpdateRow(row);
|
|
E.dirty++;
|
|
}
|
|
|
|
/* Append the string 's' at the end of a row */
|
|
void editorRowAppendString(erow *row, char *s, size_t len) {
|
|
row->chars = realloc(row->chars,row->size+len+1);
|
|
memcpy(row->chars+row->size,s,len);
|
|
row->size += len;
|
|
row->chars[row->size] = '\0';
|
|
editorUpdateRow(row);
|
|
E.dirty++;
|
|
}
|
|
|
|
/* Delete the character at offset 'at' from the specified row. */
|
|
void editorRowDelChar(erow *row, int at) {
|
|
if (row->size <= at) return;
|
|
memmove(row->chars+at,row->chars+at+1,row->size-at);
|
|
editorUpdateRow(row);
|
|
row->size--;
|
|
E.dirty++;
|
|
}
|
|
|
|
/* Insert the specified char at the current prompt position. */
|
|
void editorInsertChar(int c) {
|
|
int filerow = E.rowoff+E.cy;
|
|
int filecol = E.coloff+E.cx;
|
|
erow *row = (filerow >= E.numrows) ? NULL : &E.row[filerow];
|
|
|
|
/* If the row where the cursor is currently located does not exist in our
|
|
* logical representaion of the file, add enough empty rows as needed. */
|
|
if (!row) {
|
|
while(E.numrows <= filerow)
|
|
editorInsertRow(E.numrows,"",0);
|
|
}
|
|
row = &E.row[filerow];
|
|
editorRowInsertChar(row,filecol,c);
|
|
if (E.cx == E.screencols-1)
|
|
E.coloff++;
|
|
else
|
|
E.cx++;
|
|
E.dirty++;
|
|
}
|
|
|
|
/* Inserting a newline is slightly complex as we have to handle inserting a
|
|
* newline in the middle of a line, splitting the line as needed. */
|
|
void editorInsertNewline(void) {
|
|
int filerow = E.rowoff+E.cy;
|
|
int filecol = E.coloff+E.cx;
|
|
erow *row = (filerow >= E.numrows) ? NULL : &E.row[filerow];
|
|
|
|
if (!row) {
|
|
if (filerow == E.numrows) {
|
|
editorInsertRow(filerow,"",0);
|
|
goto fixcursor;
|
|
}
|
|
return;
|
|
}
|
|
/* If the cursor is over the current line size, we want to conceptually
|
|
* think it's just over the last character. */
|
|
if (filecol >= row->size) filecol = row->size;
|
|
if (filecol == 0) {
|
|
editorInsertRow(filerow,"",0);
|
|
} else {
|
|
/* We are in the middle of a line. Split it between two rows. */
|
|
editorInsertRow(filerow+1,row->chars+filecol,row->size-filecol);
|
|
row = &E.row[filerow];
|
|
row->chars[filecol] = '\0';
|
|
row->size = filecol;
|
|
editorUpdateRow(row);
|
|
}
|
|
fixcursor:
|
|
if (E.cy == E.screenrows-1) {
|
|
E.rowoff++;
|
|
} else {
|
|
E.cy++;
|
|
}
|
|
E.cx = 0;
|
|
E.coloff = 0;
|
|
}
|
|
|
|
/* Delete the char at the current prompt position. */
|
|
void editorDelChar() {
|
|
int filerow = E.rowoff+E.cy;
|
|
int filecol = E.coloff+E.cx;
|
|
erow *row = (filerow >= E.numrows) ? NULL : &E.row[filerow];
|
|
|
|
if (!row || (filecol == 0 && filerow == 0)) return;
|
|
if (filecol == 0) {
|
|
/* Handle the case of column 0, we need to move the current line
|
|
* on the right of the previous one. */
|
|
filecol = E.row[filerow-1].size;
|
|
editorRowAppendString(&E.row[filerow-1],row->chars,row->size);
|
|
editorDelRow(filerow);
|
|
row = NULL;
|
|
if (E.cy == 0)
|
|
E.rowoff--;
|
|
else
|
|
E.cy--;
|
|
E.cx = filecol;
|
|
if (E.cx >= E.screencols) {
|
|
int shift = (E.screencols-E.cx)+1;
|
|
E.cx -= shift;
|
|
E.coloff += shift;
|
|
}
|
|
} else {
|
|
editorRowDelChar(row,filecol-1);
|
|
if (E.cx == 0 && E.coloff)
|
|
E.coloff--;
|
|
else
|
|
E.cx--;
|
|
}
|
|
if (row) editorUpdateRow(row);
|
|
E.dirty++;
|
|
}
|
|
|
|
/* Load the specified program in the editor memory and returns 0 on success
|
|
* or 1 on error. */
|
|
int editorOpen(char *filename) {
|
|
FILE *fp;
|
|
|
|
E.dirty = 0;
|
|
free(E.filename);
|
|
size_t fnlen = strlen(filename)+1;
|
|
E.filename = malloc(fnlen);
|
|
memcpy(E.filename,filename,fnlen);
|
|
|
|
fp = fopen(filename,"r");
|
|
if (!fp) {
|
|
if (errno != ENOENT) {
|
|
perror("Opening file");
|
|
exit(1);
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
char *line = NULL;
|
|
size_t linecap = 0;
|
|
ssize_t linelen;
|
|
while((linelen = getline(&line,&linecap,fp)) != -1) {
|
|
if (linelen && (line[linelen-1] == '\n' || line[linelen-1] == '\r'))
|
|
line[--linelen] = '\0';
|
|
editorInsertRow(E.numrows,line,linelen);
|
|
}
|
|
free(line);
|
|
fclose(fp);
|
|
E.dirty = 0;
|
|
return 0;
|
|
}
|
|
|
|
/* Save the current file on disk. Return 0 on success, 1 on error. */
|
|
int editorSave(void) {
|
|
int len;
|
|
char *buf = editorRowsToString(&len);
|
|
int fd = open(E.filename,O_RDWR|O_CREAT,0644);
|
|
if (fd == -1) goto writeerr;
|
|
|
|
/* Use truncate + a single write(2) call in order to make saving
|
|
* a bit safer, under the limits of what we can do in a small editor. */
|
|
if (ftruncate(fd,len) == -1) goto writeerr;
|
|
if (write(fd,buf,len) != len) goto writeerr;
|
|
|
|
close(fd);
|
|
free(buf);
|
|
E.dirty = 0;
|
|
editorSetStatusMessage("%d bytes written on disk", len);
|
|
return 0;
|
|
|
|
writeerr:
|
|
free(buf);
|
|
if (fd != -1) close(fd);
|
|
editorSetStatusMessage("Can't save! I/O error: %s",strerror(errno));
|
|
return 1;
|
|
}
|
|
|
|
/* ============================= Terminal update ============================ */
|
|
|
|
/* 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;
|
|
};
|
|
|
|
#define ABUF_INIT {NULL,0}
|
|
|
|
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;
|
|
}
|
|
|
|
void abFree(struct abuf *ab) {
|
|
free(ab->b);
|
|
}
|
|
|
|
extern char *Previous_error;
|
|
|
|
/* This function writes the whole screen using VT100 escape characters
|
|
* starting from the logical state of the editor in the global state 'E'. */
|
|
void editorRefreshScreen(void) {
|
|
int y;
|
|
erow *r;
|
|
char buf[32];
|
|
struct abuf ab = ABUF_INIT;
|
|
|
|
abAppend(&ab,"\x1b[?25l",6); /* Hide cursor. */
|
|
abAppend(&ab,"\x1b[H",3); /* Go home. */
|
|
for (y = 0; y < E.screenrows; y++) {
|
|
int filerow = E.rowoff+y;
|
|
|
|
if (filerow >= E.numrows) {
|
|
if (E.numrows == 0 && y == E.screenrows/3) {
|
|
char welcome[80];
|
|
int welcomelen = snprintf(welcome,sizeof(welcome),
|
|
"Kilo editor -- verison %s\x1b[0K\r\n", KILO_VERSION);
|
|
int padding = (E.screencols-welcomelen)/2;
|
|
if (padding) {
|
|
abAppend(&ab,"~",1);
|
|
padding--;
|
|
}
|
|
while(padding--) abAppend(&ab," ",1);
|
|
abAppend(&ab,welcome,welcomelen);
|
|
} else {
|
|
abAppend(&ab,"~\x1b[0K\r\n",7);
|
|
}
|
|
continue;
|
|
}
|
|
|
|
r = &E.row[filerow];
|
|
|
|
int len = r->rsize - E.coloff;
|
|
int current_color = -1;
|
|
if (len > 0) {
|
|
if (len > E.screencols) len = E.screencols;
|
|
char *c = r->render+E.coloff;
|
|
unsigned char *hl = r->hl+E.coloff;
|
|
int j;
|
|
for (j = 0; j < len; j++) {
|
|
if (hl[j] == HL_NONPRINT) {
|
|
char sym;
|
|
abAppend(&ab,"\x1b[7m",4);
|
|
if (c[j] <= 26)
|
|
sym = '@'+c[j];
|
|
else
|
|
sym = '?';
|
|
abAppend(&ab,&sym,1);
|
|
abAppend(&ab,"\x1b[0m",4);
|
|
} else if (hl[j] == HL_NORMAL) {
|
|
if (current_color != -1) {
|
|
abAppend(&ab,"\x1b[39m",5);
|
|
current_color = -1;
|
|
}
|
|
abAppend(&ab,c+j,1);
|
|
} else {
|
|
int color = editorSyntaxToColor(hl[j]);
|
|
if (color != current_color) {
|
|
char buf[16];
|
|
int clen = snprintf(buf,sizeof(buf),"\x1b[%dm",color);
|
|
current_color = color;
|
|
abAppend(&ab,buf,clen);
|
|
}
|
|
abAppend(&ab,c+j,1);
|
|
}
|
|
}
|
|
}
|
|
abAppend(&ab,"\x1b[39m",5);
|
|
abAppend(&ab,"\x1b[0K",4);
|
|
abAppend(&ab,"\r\n",2);
|
|
}
|
|
|
|
/* Create a two rows status. First row: */
|
|
abAppend(&ab,"\x1b[0K",4);
|
|
abAppend(&ab,"\x1b[7m \x1b[0m ^e \x1b[7m run ",23);
|
|
int len = 2 + 4 + 5;
|
|
if (Previous_error != NULL) {
|
|
abAppend(&ab,"\x1b[0m ^c \x1b[7m\x1b[0m\x1b[1m abort ",27);
|
|
len += 4 + 7;
|
|
}
|
|
abAppend(&ab,"\x1b[0m ^s \x1b[7m search ",20);
|
|
len += 4 + 8;
|
|
char rstatus[80];
|
|
int rlen = snprintf(rstatus, sizeof(rstatus),
|
|
"%d/%d",E.rowoff+E.cy+1,E.numrows);
|
|
while(len < E.screencols) {
|
|
if (E.screencols - len == rlen) {
|
|
abAppend(&ab,rstatus,rlen);
|
|
break;
|
|
} else {
|
|
abAppend(&ab," ",1);
|
|
len++;
|
|
}
|
|
}
|
|
abAppend(&ab,"\x1b[0m\r\n",6);
|
|
|
|
/* Second row depends on E.statusmsg and the status message update time. */
|
|
abAppend(&ab,"\x1b[0K",4);
|
|
int msglen = strlen(E.statusmsg);
|
|
if (msglen && time(NULL)-E.statusmsg_time < 5)
|
|
abAppend(&ab,E.statusmsg,msglen <= E.screencols ? msglen : E.screencols);
|
|
|
|
/* Put cursor at its current position. Note that the horizontal position
|
|
* at which the cursor is displayed may be different compared to 'E.cx'
|
|
* because of TABs. */
|
|
int j;
|
|
int cx = 1;
|
|
int filerow = E.rowoff+E.cy;
|
|
erow *row = (filerow >= E.numrows) ? NULL : &E.row[filerow];
|
|
if (row) {
|
|
for (j = E.coloff; j < (E.cx+E.coloff); j++) {
|
|
if (j < row->size && row->chars[j] == TAB) cx += 7-((cx)%8);
|
|
cx++;
|
|
}
|
|
}
|
|
snprintf(buf,sizeof(buf),"\x1b[%d;%dH",E.cy+1,cx);
|
|
abAppend(&ab,buf,strlen(buf));
|
|
abAppend(&ab,"\x1b[?25h",6); /* Show cursor. */
|
|
write(STDOUT_FILENO,ab.b,ab.len);
|
|
abFree(&ab);
|
|
}
|
|
|
|
/* Set an editor status message for the second line of the status, at the
|
|
* end of the screen. */
|
|
void editorSetStatusMessage(const char *fmt, ...) {
|
|
va_list ap;
|
|
va_start(ap,fmt);
|
|
vsnprintf(E.statusmsg,sizeof(E.statusmsg),fmt,ap);
|
|
va_end(ap);
|
|
E.statusmsg_time = time(NULL);
|
|
}
|
|
|
|
/* =============================== Find mode ================================ */
|
|
|
|
#define KILO_QUERY_LEN 256
|
|
|
|
void editorFind(int fd) {
|
|
char query[KILO_QUERY_LEN+1] = {0};
|
|
int qlen = 0;
|
|
int last_match = -1; /* Last line where a match was found. -1 for none. */
|
|
int find_next = 0; /* if 1 search next, if -1 search prev. */
|
|
int saved_hl_line = -1; /* No saved HL */
|
|
char *saved_hl = NULL;
|
|
|
|
#define FIND_RESTORE_HL do { \
|
|
if (saved_hl) { \
|
|
memcpy(E.row[saved_hl_line].hl,saved_hl, E.row[saved_hl_line].rsize); \
|
|
free(saved_hl); \
|
|
saved_hl = NULL; \
|
|
} \
|
|
} while (0)
|
|
|
|
/* Save the cursor position in order to restore it later. */
|
|
int saved_cx = E.cx, saved_cy = E.cy;
|
|
int saved_coloff = E.coloff, saved_rowoff = E.rowoff;
|
|
|
|
while(1) {
|
|
editorSetStatusMessage(
|
|
"Search: %s (Use ESC/Arrows/Enter)", query);
|
|
editorRefreshScreen();
|
|
|
|
int c = editorReadKey(fd);
|
|
if (c == DEL_KEY || c == CTRL_H || c == BACKSPACE) {
|
|
if (qlen != 0) query[--qlen] = '\0';
|
|
last_match = -1;
|
|
} else if (c == ESC || c == ENTER) {
|
|
if (c == ESC) {
|
|
E.cx = saved_cx; E.cy = saved_cy;
|
|
E.coloff = saved_coloff; E.rowoff = saved_rowoff;
|
|
}
|
|
FIND_RESTORE_HL;
|
|
editorSetStatusMessage("");
|
|
return;
|
|
} else if (c == ARROW_RIGHT || c == ARROW_DOWN) {
|
|
find_next = 1;
|
|
} else if (c == ARROW_LEFT || c == ARROW_UP) {
|
|
find_next = -1;
|
|
} else if (isprint(c)) {
|
|
if (qlen < KILO_QUERY_LEN) {
|
|
query[qlen++] = c;
|
|
query[qlen] = '\0';
|
|
last_match = -1;
|
|
}
|
|
}
|
|
|
|
/* Search occurrence. */
|
|
if (last_match == -1) find_next = 1;
|
|
if (find_next) {
|
|
char *match = NULL;
|
|
int match_offset = 0;
|
|
int i, current = last_match;
|
|
|
|
for (i = 0; i < E.numrows; i++) {
|
|
current += find_next;
|
|
if (current == -1) current = E.numrows-1;
|
|
else if (current == E.numrows) current = 0;
|
|
match = strstr(E.row[current].render,query);
|
|
if (match) {
|
|
match_offset = match-E.row[current].render;
|
|
break;
|
|
}
|
|
}
|
|
find_next = 0;
|
|
|
|
/* Highlight */
|
|
FIND_RESTORE_HL;
|
|
|
|
if (match) {
|
|
erow *row = &E.row[current];
|
|
last_match = current;
|
|
if (row->hl) {
|
|
saved_hl_line = current;
|
|
saved_hl = malloc(row->rsize);
|
|
memcpy(saved_hl,row->hl,row->rsize);
|
|
memset(row->hl+match_offset,HL_MATCH,qlen);
|
|
}
|
|
E.cy = 0;
|
|
E.cx = match_offset;
|
|
E.rowoff = current;
|
|
E.coloff = 0;
|
|
/* Scroll horizontally as needed. */
|
|
if (E.cx > E.screencols) {
|
|
int diff = E.cx - E.screencols;
|
|
E.cx -= diff;
|
|
E.coloff += diff;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* ========================= Editor events handling ======================== */
|
|
|
|
/* Handle cursor position change because arrow keys were pressed. */
|
|
void editorMoveCursor(int key) {
|
|
int filerow = E.rowoff+E.cy;
|
|
int filecol = E.coloff+E.cx;
|
|
int rowlen;
|
|
erow *row = (filerow >= E.numrows) ? NULL : &E.row[filerow];
|
|
|
|
switch(key) {
|
|
case ARROW_LEFT:
|
|
if (E.cx == 0) {
|
|
if (E.coloff) {
|
|
E.coloff--;
|
|
} else {
|
|
if (filerow > 0) {
|
|
E.cy--;
|
|
E.cx = E.row[filerow-1].size;
|
|
if (E.cx > E.screencols-1) {
|
|
E.coloff = E.cx-E.screencols+1;
|
|
E.cx = E.screencols-1;
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
E.cx -= 1;
|
|
}
|
|
break;
|
|
case ARROW_RIGHT:
|
|
if (row && filecol < row->size) {
|
|
if (E.cx == E.screencols-1) {
|
|
E.coloff++;
|
|
} else {
|
|
E.cx += 1;
|
|
}
|
|
} else if (row && filecol == row->size) {
|
|
E.cx = 0;
|
|
E.coloff = 0;
|
|
if (E.cy == E.screenrows-1) {
|
|
E.rowoff++;
|
|
} else {
|
|
E.cy += 1;
|
|
}
|
|
}
|
|
break;
|
|
case ARROW_UP:
|
|
if (E.cy == 0) {
|
|
if (E.rowoff) E.rowoff--;
|
|
} else {
|
|
E.cy -= 1;
|
|
}
|
|
break;
|
|
case ARROW_DOWN:
|
|
if (filerow < E.numrows) {
|
|
if (E.cy == E.screenrows-1) {
|
|
E.rowoff++;
|
|
} else {
|
|
E.cy += 1;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
/* Fix cx if the current line has not enough chars. */
|
|
filerow = E.rowoff+E.cy;
|
|
filecol = E.coloff+E.cx;
|
|
row = (filerow >= E.numrows) ? NULL : &E.row[filerow];
|
|
rowlen = row ? row->size : 0;
|
|
if (filecol > rowlen) {
|
|
E.cx -= filecol-rowlen;
|
|
if (E.cx < 0) {
|
|
E.coloff += E.cx;
|
|
E.cx = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Process events arriving from the standard input, which is, the user
|
|
* is typing stuff on the terminal. */
|
|
#define KILO_QUIT_TIMES 3
|
|
int Quit = 0;
|
|
void editorProcessKeypress(int fd) {
|
|
int c = editorReadKey(fd);
|
|
switch(c) {
|
|
case ENTER:
|
|
editorInsertNewline();
|
|
break;
|
|
case CTRL_C:
|
|
/* Mostly ignore ctrl-c. */
|
|
if (c == 3) /* ctrl-c */
|
|
if (Previous_error != NULL)
|
|
exit(1);
|
|
break;
|
|
case CTRL_E:
|
|
/* Save and quit. */
|
|
editorSave();
|
|
Quit = 1;
|
|
break;
|
|
case CTRL_F:
|
|
editorFind(fd);
|
|
break;
|
|
case BACKSPACE:
|
|
case CTRL_H:
|
|
case DEL_KEY:
|
|
editorDelChar();
|
|
break;
|
|
case PAGE_UP:
|
|
case PAGE_DOWN:
|
|
if (c == PAGE_UP && E.cy != 0)
|
|
E.cy = 0;
|
|
else if (c == PAGE_DOWN && E.cy != E.screenrows-1)
|
|
E.cy = E.screenrows-1;
|
|
{
|
|
int times = E.screenrows;
|
|
while(times--)
|
|
editorMoveCursor(c == PAGE_UP ? ARROW_UP:
|
|
ARROW_DOWN);
|
|
}
|
|
break;
|
|
|
|
case ARROW_UP:
|
|
case ARROW_DOWN:
|
|
case ARROW_LEFT:
|
|
case ARROW_RIGHT:
|
|
editorMoveCursor(c);
|
|
break;
|
|
case CTRL_L:
|
|
/* Just refresh the line as side effect. */
|
|
break;
|
|
case ESC:
|
|
/* Nothing to do for ESC in this mode. */
|
|
break;
|
|
default:
|
|
editorInsertChar(c);
|
|
break;
|
|
}
|
|
}
|
|
|
|
int editorFileWasModified(void) {
|
|
return E.dirty;
|
|
}
|
|
|
|
void updateWindowSize(void) {
|
|
if (getWindowSize(STDIN_FILENO,STDOUT_FILENO,
|
|
&E.screenrows,&E.screencols) == -1) {
|
|
perror("Unable to query the screen for size (columns / rows)");
|
|
exit(1);
|
|
}
|
|
E.screenrows -= 2; /* Get room for status bar. */
|
|
}
|
|
|
|
void handleSigWinCh(int unused __attribute__((unused))) {
|
|
updateWindowSize();
|
|
if (E.cy > E.screenrows) E.cy = E.screenrows - 1;
|
|
if (E.cx > E.screencols) E.cx = E.screencols - 1;
|
|
editorRefreshScreen();
|
|
}
|
|
|
|
void initEditor(void) {
|
|
E.cx = 0;
|
|
E.cy = 0;
|
|
E.rowoff = 0;
|
|
E.coloff = 0;
|
|
E.numrows = 0;
|
|
E.row = NULL;
|
|
E.dirty = 0;
|
|
E.filename = NULL;
|
|
E.syntax = &HLDB[0];
|
|
updateWindowSize();
|
|
signal(SIGWINCH, handleSigWinCh);
|
|
}
|
|
|
|
void edit(char* filename, char* message) {
|
|
initEditor();
|
|
editorOpen(filename);
|
|
enableRawMode(STDIN_FILENO);
|
|
editorSetStatusMessage(message);
|
|
while(!Quit) {
|
|
editorRefreshScreen();
|
|
editorProcessKeypress(STDIN_FILENO);
|
|
}
|
|
disableRawMode(STDIN_FILENO);
|
|
}
|
|
|
|
extern void teliva_get_definition(lua_State *L, const char *name);
|
|
extern void stackDump (lua_State *L);
|
|
extern int dostring (lua_State *L, const char *s, const char *name);
|
|
extern char *Image_name;
|
|
void editString(lua_State *L, char *name) {
|
|
/* write given definition out to tmp file */
|
|
//? stackDump(L);
|
|
teliva_get_definition(L, name);
|
|
//? stackDump(L);
|
|
char *contents = lua_tostring(L, -1);
|
|
int outfd = open("teliva_editbuffer", O_WRONLY|O_CREAT|O_TRUNC, 0644);
|
|
write(outfd, contents, strlen(contents));
|
|
close(outfd);
|
|
|
|
/* edit tmp file */
|
|
edit("teliva_editbuffer", "");
|
|
|
|
/* read contents of tmp file */
|
|
char new_contents[8192] = {0};
|
|
int infd = open("teliva_editbuffer", O_RDONLY);
|
|
read(infd, new_contents, 8190); /* TODO: handle overly large file */
|
|
close(infd);
|
|
|
|
/* save contents back into image */
|
|
lua_pop(L, 1);
|
|
lua_pushstring(L, new_contents);
|
|
lua_setfield(L, -2, name);
|
|
|
|
/* save teliva_program to disk */
|
|
int table = lua_gettop(L);
|
|
FILE* fp = fopen(Image_name, "w");
|
|
fprintf(fp, "teliva_program = {\n");
|
|
for (lua_pushnil(L); lua_next(L, table) != 0; lua_pop(L, 1)) {
|
|
const char* key = lua_tostring(L, -2);
|
|
const char* value = lua_tostring(L, -1);
|
|
fprintf(fp, " %s = [[", key);
|
|
fprintf(fp, "%s", value);
|
|
fprintf(fp, "]],\n");
|
|
}
|
|
fprintf(fp, "}\n");
|
|
fclose(fp);
|
|
|
|
/* reload binding */
|
|
dostring(L, new_contents, name);
|
|
/* TODO: handle error */
|
|
}
|