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	gramscii.c - gramscii - A simple editor for ASCII box-and-arrow charts
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	gramscii.c (4678B)
	---
	1 /*
	2 *
	3 * gramscii: a simple editor for ASCII box-and-arrow charts
	4 *
	5 * Copyright (c) 2019 Vincenzo "KatolaZ" Nicosia <[email protected]>
	6 *
	7 * This program is free software: you can redistribute it and/or modify
	8 * it under the terms of the GNU General Public License as published by
	9 * the Free Software Foundation, either version 3 of the License, or
	10 * (at your option) any later version.
	11 *
	12 * This program is distributed in the hope that it will be useful,
	13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
	14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15 * GNU General Public License for more details.
	16 *
	17 * You should have received a copy of the GNU General Public License
	18 * along with this program. Please see the attached file COPYING.
	19 * Otherwise, please visit <https://www.gnu.org/licenses/>.
	20 *
	21 */
	22
	23 #define _POSIX_C_SOURCE 200112L
	24
	25 #include <stdio.h>
	26 #include <stdlib.h>
	27 #include <signal.h>
	28
	29 #include "arg.h"
	30 #include "gramscii.h"
	31
	32 / global variables /
	33
	34 lineset_t screen; /* what is visualised */
	35 lineset_t cutbuf; /* cut/paste buffer */
	36 lineset_t undo; / undo list */
	37
	38 pos_t marks[26]; /* position marks */
	39 char mark_map[26]; /* marks map */
	40
	41 int undo_sz;/* allocated size of undo list*/
	42 int undo_cur;/* undo position */
	43 int undo_lst;/* last valid undo position */
	44
	45 int WIDTH, HEIGHT;
	46
	47 int mode;/* mode */
	48 int dir;/* line direction */
	49 int x;
	50 int y;
	51 int step;/* current step */
	52 int mult;/* current multiplier */
	53 int force_new;
	54 char corner;
	55
	56 /* number of available markers for each type */
	57 int hlines_sz;
	58 int vlines_sz;
	59 int corners_sz;
	60 int stmarks_sz;
	61 int endmarks_sz;
	62 /**/
	63
	64 /* line and arrow markers */
	65 int cur_hl, cur_vl, cur_corn, cur_start, cur_end;
	66 char line_h;
	67 char line_v;
	68 char mark_st;
	69 char mark_end;
	70 /**/
	71
	72 char modified; /* set to 1 if screen modified since last save */
	73 char fname[256];
	74
	75
	76 char script; /* set to 1 in script-mode */
	77 char autoend; /* set to 1 in auto-arrow mode */
	78
	79 /* Used by draw_arrow to identify the bounding box */
	80 int a_miny;
	81 int a_maxy;
	82 /**/
	83
	84 struct termios t1, t2, t3;
	85
	86 / End of global variables /
	87
	88 char *argv0;
	89
	90
	91 void cleanup(int s){
	92
	93 if (!script){
	94 printf("\033[;H\033[2J");
	95 tcsetattr(0, TCSANOW, &t1);
	96 }
	97 else
	98 dump_lines(screen, stdout);
	99 fflush(stdout);
	100 exit(s);
	101 }
	102
	103 /* Initialisation */
	104
	105 void init(){
	106
	107 signal(SIGHUP, cleanup);
	108 signal(SIGINT, cleanup);
	109 signal(SIGTERM, cleanup);
	110 signal(SIGQUIT, cleanup);
	111
	112 if (!script){
	113 tcgetattr(0, &t1);
	114 t2 = t1;
	115 t2.c_lflag &= ~(ICANON \| ECHO);
	116 tcsetattr(0, TCSANOW, &t2);
	117 }
	118 init_screen();
	119 x = 0;
	120 y = 0;
	121 step = 1;
	122 modified = 0;
	123 fname[0] = '\0';
	124 redraw();
	125 }
	126
	127
	128 /* Commands */
	129
	130 void commands(FILE *fc){
	131
	132 int c;
	133 while((c=fgetc(fc))!=EOF){
	134 if (!change_style(c) && !move_around(c, fc, 1)){
	135 #ifdef DEBUG
	136 fprintf(stderr, "got command: %c\n", c);
	137 #endif
	138 switch(c){
	139 case 'i':
	140 mode = TEXT;
	141 get_text(fc);
	142 break;
	143 case 'R':
	144 redraw();
	145 break;
	146 case 'b':
	147 mode = BOX;
	148 get_box(fc, BOX_RECT);
	149 break;
	150 case 'A': autoend=1;
	151 case 'a':
	152 mode = ARROW;
	153 get_arrow(fc);
	154 autoend = 0;
	155 break;
	156 case 'W':
	157 force_new = 1;/ FALLTHROUGH /
	158 case 'w':
	159 write_file(fc);
	160 break;
	161 case 'e':
	162 check_modified(fc);/** FALLTHROU…
	163 case 'E':
	164 load_file(fc);
	165 break;
	166 case 'N':
	167 new_file(fc);
	168 break;
	169 case 'x':
	170 mode = DEL;
	171 erase(fc);
	172 break;
	173 case 'v':
	174 mode = VIS;
	175 visual_box(fc);
	176 break;
	177 case 'C':
	178 crop_to_nonblank();
	179 break;
	180 case 'p':
	181 paste();
	182 break;
	183 case 'u':
	184 undo_change();
	185 break;
	186 case 'U':
	187 redo_change();
	188 break;
	189 case 'r':
	190 read_file_at(fc, x, y);
	191 break;
	192 case 't':
	193 mode = TRP;
	194 get_box(fc, BOX_TRAP_UC);
	195 break;
	196 case 'z':
	197 mode = PAR;
	198 get_box(fc, BOX_PARR);
	199 break;
	200 case '#':
	201 mode = REM;
	202 get_comment(fc);
	203 break;
	204 case 'M':
	205 mark_pos(fc);
	206 break;
	207 case 'q':
	208 check_modified(fc);/** FALLTHROU…
	209 case 'Q':
	210 cleanup(0);
	211 break;
	212 }
	213 }
	214 check_bound(&x, &y);
	215 status_bar();
	216 show_cursor();
	217 step = 1;
	218 force_new = 0;
	219 }
	220
	221 }
	222
	223 void usage(){
	224 fprintf(stderr, "Usage: %s [-s] [-h] [file ...]\n", argv0);
	225 exit(1);
	226 }
	227
	228
	229 int main(int argc, char *argv[]){
	230 FILE *fc;
	231
	232 ARGBEGIN {
	233 case 's':
	234 script = 1;
	235 break;
	236 case 'h': /* FALLTHROUGH */
	237 default:
	238 usage();
	239 } ARGEND;
	240
	241 init();
	242 while (argc){
	243 fc = fopen(argv[0], "r");
	244 if (fc == NULL){
	245 fprintf(stderr, "Error opening file %s\n", argv[…
	246 }
	247 else {
	248 commands(fc);
	249 fflush(fc);
	250 fclose(fc);
	251 redraw();
	252 }
	253 argv++;
	254 argc--;
	255 }
	256 commands(stdin);
	257 cleanup(0);
	258 }