2 65d9b3ca 2021-03-14 op * Copyright (c) 2021 Omar Polo <op@omarpolo.com>
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.
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.
17 65d9b3ca 2021-03-14 op #include <stdlib.h>
18 65d9b3ca 2021-03-14 op #include <string.h>
20 5caf7d67 2021-07-12 op #include "telescope.h"
21 5caf7d67 2021-07-12 op #include "utf8.h"
24 65d9b3ca 2021-03-14 op * Text wrapping
25 65d9b3ca 2021-03-14 op * =============
27 65d9b3ca 2021-03-14 op * There's a simple text wrapping algorithm.
29 65d9b3ca 2021-03-14 op * 1. if it's a line in a pre-formatted block:
30 65d9b3ca 2021-03-14 op * a. hard wrap.
32 676fba6f 2021-03-21 op * 2. otherwise advance the line char by char.
33 676fba6f 2021-03-21 op * 3. when ending the space, split the line at the last occurrence of
34 676fba6f 2021-03-21 op * a "word separator" (i.e. " \t-") or at point if none.
40 bca92a4c 2021-07-01 op erase_buffer(struct buffer *buffer)
42 bca92a4c 2021-07-01 op empty_vlist(buffer);
43 bca92a4c 2021-07-01 op empty_linelist(buffer);
47 46f6e974 2021-05-17 op empty_linelist(struct buffer *buffer)
49 ca5da938 2021-04-01 op struct line *l, *lt;
51 46f6e974 2021-05-17 op TAILQ_FOREACH_SAFE(l, &buffer->page.head, lines, lt) {
52 46f6e974 2021-05-17 op TAILQ_REMOVE(&buffer->page.head, l, lines);
53 ca5da938 2021-04-01 op free(l->line);
60 46f6e974 2021-05-17 op empty_vlist(struct buffer *buffer)
62 ca5da938 2021-04-01 op struct vline *vl, *t;
64 4ea9160a 2021-07-01 op buffer->top_line = NULL;
65 4ea9160a 2021-07-01 op buffer->line_off = 0;
66 46f6e974 2021-05-17 op buffer->current_line = NULL;
67 46f6e974 2021-05-17 op buffer->line_max = 0;
69 46f6e974 2021-05-17 op TAILQ_FOREACH_SAFE(vl, &buffer->head, vlines, t) {
70 46f6e974 2021-05-17 op TAILQ_REMOVE(&buffer->head, vl, vlines);
71 ca5da938 2021-04-01 op free(vl->line);
77 5492b68f 2021-07-05 op push_line(struct buffer *buffer, const struct line *l, const char *buf, size_t len, int flags)
79 65d9b3ca 2021-03-14 op struct vline *vl;
81 46f6e974 2021-05-17 op buffer->line_max++;
83 65d9b3ca 2021-03-14 op if ((vl = calloc(1, sizeof(*vl))) == NULL)
86 65d9b3ca 2021-03-14 op if (len != 0 && (vl->line = calloc(1, len+1)) == NULL) {
91 65d9b3ca 2021-03-14 op vl->parent = l;
93 65d9b3ca 2021-03-14 op memcpy(vl->line, buf, len);
94 5492b68f 2021-07-05 op vl->flags = flags;
96 46f6e974 2021-05-17 op if (TAILQ_EMPTY(&buffer->head))
97 46f6e974 2021-05-17 op TAILQ_INSERT_HEAD(&buffer->head, vl, vlines);
99 46f6e974 2021-05-17 op TAILQ_INSERT_TAIL(&buffer->head, vl, vlines);
104 65d9b3ca 2021-03-14 op * Build a list of visual line by wrapping the given line, assuming
105 65d9b3ca 2021-03-14 op * that when printed will have a leading prefix prfx.
108 46f6e974 2021-05-17 op wrap_text(struct buffer *buffer, const char *prfx, struct line *l, size_t width)
110 676fba6f 2021-03-21 op const char *separators = " \t-";
111 676fba6f 2021-03-21 op const char *start, *end, *line, *lastsep, *lastchar;
112 676fba6f 2021-03-21 op uint32_t cp = 0, state = 0;
113 676fba6f 2021-03-21 op size_t cur, prfxwidth, w;
116 676fba6f 2021-03-21 op if ((line = l->line) == NULL)
117 46f6e974 2021-05-17 op return push_line(buffer, l, NULL, 0, 0);
119 676fba6f 2021-03-21 op prfxwidth = utf8_swidth(prfx);
120 676fba6f 2021-03-21 op cur = prfxwidth;
121 676fba6f 2021-03-21 op start = line;
122 676fba6f 2021-03-21 op lastsep = NULL;
123 676fba6f 2021-03-21 op lastchar = line;
125 676fba6f 2021-03-21 op for (; *line; line++) {
126 676fba6f 2021-03-21 op if (utf8_decode(&state, &cp, *line))
128 676fba6f 2021-03-21 op w = utf8_chwidth(cp);
129 676fba6f 2021-03-21 op if (cur + w >= width -1) {
130 676fba6f 2021-03-21 op end = lastsep == NULL
131 676fba6f 2021-03-21 op ? utf8_next_cp((char*)lastchar)
132 676fba6f 2021-03-21 op : utf8_next_cp((char*)lastsep);
133 5492b68f 2021-07-05 op if (!push_line(buffer, l, start, end - start, flags))
135 963c680c 2021-07-05 op flags = L_CONTINUATION;
137 676fba6f 2021-03-21 op cur = prfxwidth + utf8_swidth_between(start, lastchar);
138 5b010818 2021-07-05 op } else if (strchr(separators, *line) != NULL) {
139 5b010818 2021-07-05 op lastsep = line;
142 676fba6f 2021-03-21 op lastchar = utf8_prev_cp(line, l->line);
146 5492b68f 2021-07-05 op return push_line(buffer, l, start, line - start, flags);
150 46f6e974 2021-05-17 op hardwrap_text(struct buffer *buffer, struct line *l, size_t width)
152 676fba6f 2021-03-21 op const char *line, *start, *lastchar;
154 676fba6f 2021-03-21 op uint32_t state = 0, cp = 0;
155 676fba6f 2021-03-21 op size_t cur, w;
157 676fba6f 2021-03-21 op if ((line = l->line) == NULL)
158 46f6e974 2021-05-17 op return push_line(buffer, l, NULL, 0, 0);
160 676fba6f 2021-03-21 op start = line;
161 676fba6f 2021-03-21 op lastchar = line;
164 676fba6f 2021-03-21 op for (; *line; line++) {
165 676fba6f 2021-03-21 op if (utf8_decode(&state, &cp, *line))
167 676fba6f 2021-03-21 op w = utf8_chwidth(cp);
168 676fba6f 2021-03-21 op if (cur + w >= width) {
169 46f6e974 2021-05-17 op if (!push_line(buffer, l, start, lastchar - start, cont))
173 676fba6f 2021-03-21 op start = lastchar;
176 676fba6f 2021-03-21 op lastchar = utf8_prev_cp(line, l->line);
180 46f6e974 2021-05-17 op return push_line(buffer, l, start, line - start, cont);
