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Date:: Mon Mar 22 08:44:36 2021 UTC
Message:: big refactor: introduce the window abstraction - commands now take a struct window* instead of a raw tab - the struct ui_state is gone - using a window for the minibuffer too helps avoid code duplication - it will let us having more than one window on a tab! :DD It doesn't seem to have broken anything...
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  1 65d9b3ca 2021-03-14 op /*
  2 65d9b3ca 2021-03-14 op  * Copyright (c) 2021 Omar Polo <op@omarpolo.com>
  3 65d9b3ca 2021-03-14 op  *
  4 65d9b3ca 2021-03-14 op  * Permission to use, copy, modify, and distribute this software for any
  5 65d9b3ca 2021-03-14 op  * purpose with or without fee is hereby granted, provided that the above
  6 65d9b3ca 2021-03-14 op  * copyright notice and this permission notice appear in all copies.
  7 65d9b3ca 2021-03-14 op  *
  8 65d9b3ca 2021-03-14 op  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  9 65d9b3ca 2021-03-14 op  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 10 65d9b3ca 2021-03-14 op  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 11 65d9b3ca 2021-03-14 op  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 12 65d9b3ca 2021-03-14 op  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 13 65d9b3ca 2021-03-14 op  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 14 65d9b3ca 2021-03-14 op  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 15 65d9b3ca 2021-03-14 op  */
 16 65d9b3ca 2021-03-14 op 
 17 65d9b3ca 2021-03-14 op #include "telescope.h"
 18 65d9b3ca 2021-03-14 op 
 19 65d9b3ca 2021-03-14 op #include <stdlib.h>
 20 65d9b3ca 2021-03-14 op #include <string.h>
 21 65d9b3ca 2021-03-14 op 
 22 65d9b3ca 2021-03-14 op /*
 23 65d9b3ca 2021-03-14 op  * Text wrapping
 24 65d9b3ca 2021-03-14 op  * =============
 25 65d9b3ca 2021-03-14 op  *
 26 65d9b3ca 2021-03-14 op  * There's a simple text wrapping algorithm.
 27 65d9b3ca 2021-03-14 op  *
 28 65d9b3ca 2021-03-14 op  * 1. if it's a line in a pre-formatted block:
 29 65d9b3ca 2021-03-14 op  *    a. hard wrap.
 30 65d9b3ca 2021-03-14 op  *    b. repeat
 31 676fba6f 2021-03-21 op  * 2. otherwise advance the line char by char.
 32 676fba6f 2021-03-21 op  * 3. when ending the space, split the line at the last occurrence of
 33 676fba6f 2021-03-21 op  *    a "word separator" (i.e. " \t-") or at point if none.
 34 65d9b3ca 2021-03-14 op  * 4. repeat
 35 65d9b3ca 2021-03-14 op  *
 36 65d9b3ca 2021-03-14 op  */
 37 65d9b3ca 2021-03-14 op 
 38 65d9b3ca 2021-03-14 op static int
 39 2ba66cea 2021-03-22 op push_line(struct window *window, const struct line *l, const char *buf, size_t len, int cont)
 40 65d9b3ca 2021-03-14 op {
 41 65d9b3ca 2021-03-14 op 	struct vline *vl;
 42 65d9b3ca 2021-03-14 op 
 43 2ba66cea 2021-03-22 op 	window->line_max++;
 44 65d9b3ca 2021-03-14 op 
 45 65d9b3ca 2021-03-14 op 	if ((vl = calloc(1, sizeof(*vl))) == NULL)
 46 65d9b3ca 2021-03-14 op 		return 0;
 47 65d9b3ca 2021-03-14 op 
 48 65d9b3ca 2021-03-14 op 	if (len != 0 && (vl->line = calloc(1, len+1)) == NULL) {
 49 65d9b3ca 2021-03-14 op 		free(vl);
 50 65d9b3ca 2021-03-14 op 		return 0;
 51 65d9b3ca 2021-03-14 op 	}
 52 65d9b3ca 2021-03-14 op 
 53 65d9b3ca 2021-03-14 op 	vl->parent = l;
 54 65d9b3ca 2021-03-14 op 	if (len != 0)
 55 65d9b3ca 2021-03-14 op 		memcpy(vl->line, buf, len);
 56 65d9b3ca 2021-03-14 op 	vl->flags = cont;
 57 65d9b3ca 2021-03-14 op 
 58 2ba66cea 2021-03-22 op 	if (TAILQ_EMPTY(&window->head))
 59 2ba66cea 2021-03-22 op 		TAILQ_INSERT_HEAD(&window->head, vl, vlines);
 60 65d9b3ca 2021-03-14 op 	else
 61 2ba66cea 2021-03-22 op 		TAILQ_INSERT_TAIL(&window->head, vl, vlines);
 62 65d9b3ca 2021-03-14 op 	return 1;
 63 65d9b3ca 2021-03-14 op }
 64 65d9b3ca 2021-03-14 op 
 65 65d9b3ca 2021-03-14 op /*
 66 65d9b3ca 2021-03-14 op  * Build a list of visual line by wrapping the given line, assuming
 67 65d9b3ca 2021-03-14 op  * that when printed will have a leading prefix prfx.
 68 65d9b3ca 2021-03-14 op  */
 69 676fba6f 2021-03-21 op int
 70 2ba66cea 2021-03-22 op wrap_text(struct window *window, const char *prfx, struct line *l, size_t width)
 71 65d9b3ca 2021-03-14 op {
 72 676fba6f 2021-03-21 op 	const char	*separators = " \t-";
 73 676fba6f 2021-03-21 op 	const char	*start, *end, *line, *lastsep, *lastchar;
 74 676fba6f 2021-03-21 op 	uint32_t	 cp = 0, state = 0;
 75 676fba6f 2021-03-21 op 	size_t		 cur, prfxwidth, w;
 76 676fba6f 2021-03-21 op 	int		 cont;
 77 65d9b3ca 2021-03-14 op 
 78 676fba6f 2021-03-21 op 	if ((line = l->line) == NULL)
 79 2ba66cea 2021-03-22 op 		return push_line(window, l, NULL, 0, 0);
 80 65d9b3ca 2021-03-14 op 
 81 676fba6f 2021-03-21 op 	prfxwidth = utf8_swidth(prfx);
 82 676fba6f 2021-03-21 op 	cur = prfxwidth;
 83 676fba6f 2021-03-21 op 	start = line;
 84 676fba6f 2021-03-21 op 	lastsep = NULL;
 85 676fba6f 2021-03-21 op 	lastchar = line;
 86 676fba6f 2021-03-21 op 	cont = 0;
 87 676fba6f 2021-03-21 op 	for (; *line; line++) {
 88 676fba6f 2021-03-21 op 		if (utf8_decode(&state, &cp, *line))
 89 676fba6f 2021-03-21 op 			continue;
 90 676fba6f 2021-03-21 op 		w = utf8_chwidth(cp);
 91 676fba6f 2021-03-21 op 		if (cur + w >= width -1) {
 92 676fba6f 2021-03-21 op 			end = lastsep == NULL
 93 676fba6f 2021-03-21 op 				? utf8_next_cp((char*)lastchar)
 94 676fba6f 2021-03-21 op 				: utf8_next_cp((char*)lastsep);
 95 2ba66cea 2021-03-22 op 			if (!push_line(window, l, start, end - start, cont))
 96 676fba6f 2021-03-21 op 				return 0;
 97 676fba6f 2021-03-21 op 			cont = 1;
 98 676fba6f 2021-03-21 op 			start = end;
 99 676fba6f 2021-03-21 op 			cur = prfxwidth + utf8_swidth_between(start, lastchar);
100 676fba6f 2021-03-21 op 		} else {
101 676fba6f 2021-03-21 op 			if (strchr(separators, *line) != NULL)
102 676fba6f 2021-03-21 op 				lastsep = line;
103 65d9b3ca 2021-03-14 op 		}
104 65d9b3ca 2021-03-14 op 
105 676fba6f 2021-03-21 op 		lastchar = utf8_prev_cp(line, l->line);
106 676fba6f 2021-03-21 op 		cur += w;
107 65d9b3ca 2021-03-14 op 	}
108 65d9b3ca 2021-03-14 op 
109 2ba66cea 2021-03-22 op 	return push_line(window, l, start, line - start, cont);
110 65d9b3ca 2021-03-14 op }
111 65d9b3ca 2021-03-14 op 
112 65d9b3ca 2021-03-14 op int
113 2ba66cea 2021-03-22 op hardwrap_text(struct window *window, struct line *l, size_t width)
114 65d9b3ca 2021-03-14 op {
115 676fba6f 2021-03-21 op 	const char	*line, *start, *lastchar;
116 65d9b3ca 2021-03-14 op 	int		 cont;
117 676fba6f 2021-03-21 op 	uint32_t	 state = 0, cp = 0;
118 676fba6f 2021-03-21 op 	size_t		 cur, w;
119 65d9b3ca 2021-03-14 op 
120 676fba6f 2021-03-21 op 	if ((line = l->line) == NULL)
121 2ba66cea 2021-03-22 op 		return push_line(window, l, NULL, 0, 0);
122 166712b4 2021-03-14 op 
123 676fba6f 2021-03-21 op 	start = line;
124 676fba6f 2021-03-21 op 	lastchar = line;
125 676fba6f 2021-03-21 op 	cont = 0;
126 676fba6f 2021-03-21 op 	cur = 0;
127 676fba6f 2021-03-21 op 	for (; *line; line++) {
128 676fba6f 2021-03-21 op 		if (utf8_decode(&state, &cp, *line))
129 676fba6f 2021-03-21 op 			continue;
130 676fba6f 2021-03-21 op 		w = utf8_chwidth(cp);
131 676fba6f 2021-03-21 op 		if (cur + w >= width) {
132 2ba66cea 2021-03-22 op 			if (!push_line(window, l, start, lastchar - start, cont))
133 676fba6f 2021-03-21 op 				return 0;
134 676fba6f 2021-03-21 op 			cont = 1;
135 676fba6f 2021-03-21 op 			cur = 0;
136 676fba6f 2021-03-21 op 			start = lastchar;
137 676fba6f 2021-03-21 op 		}
138 65d9b3ca 2021-03-14 op 
139 676fba6f 2021-03-21 op 		lastchar = utf8_prev_cp(line, l->line);
140 676fba6f 2021-03-21 op 		cur += w;
141 65d9b3ca 2021-03-14 op 	}
142 65d9b3ca 2021-03-14 op 
143 2ba66cea 2021-03-22 op 	return push_line(window, l, start, line - start, cont);
144 65d9b3ca 2021-03-14 op }