1 1ac119fb 2024-01-23 op /*
  2 1ac119fb 2024-01-23 op  * Copyright (c) 2021 Omar Polo <op@omarpolo.com>
  3 1ac119fb 2024-01-23 op  *
  4 1ac119fb 2024-01-23 op  * Permission to use, copy, modify, and distribute this software for any
  5 1ac119fb 2024-01-23 op  * purpose with or without fee is hereby granted, provided that the above
  6 1ac119fb 2024-01-23 op  * copyright notice and this permission notice appear in all copies.
  7 1ac119fb 2024-01-23 op  *
  8 1ac119fb 2024-01-23 op  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  9 1ac119fb 2024-01-23 op  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 10 1ac119fb 2024-01-23 op  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 11 1ac119fb 2024-01-23 op  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 12 1ac119fb 2024-01-23 op  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 13 1ac119fb 2024-01-23 op  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 14 1ac119fb 2024-01-23 op  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 15 1ac119fb 2024-01-23 op  */
 16 1ac119fb 2024-01-23 op 
 17 1ac119fb 2024-01-23 op #include "compat.h"
 18 1ac119fb 2024-01-23 op 
 19 1ac119fb 2024-01-23 op #include <ctype.h>
 20 1ac119fb 2024-01-23 op #include <stdint.h>
 21 1ac119fb 2024-01-23 op #include <stdlib.h>
 22 1ac119fb 2024-01-23 op #include <string.h>
 23 1ac119fb 2024-01-23 op 
 24 1ac119fb 2024-01-23 op #include <grapheme.h>
 25 1ac119fb 2024-01-23 op 
 26 1ac119fb 2024-01-23 op #include "defaults.h"
 27 1ac119fb 2024-01-23 op #include "telescope.h"
 28 1ac119fb 2024-01-23 op #include "utf8.h"
 29 1ac119fb 2024-01-23 op 
 30 1ac119fb 2024-01-23 op void
 31 1ac119fb 2024-01-23 op erase_buffer(struct buffer *buffer)
 32 1ac119fb 2024-01-23 op {
 33 1ac119fb 2024-01-23 op 	empty_vlist(buffer);
 34 1ac119fb 2024-01-23 op 	empty_linelist(buffer);
 35 1ac119fb 2024-01-23 op }
 36 1ac119fb 2024-01-23 op 
 37 1ac119fb 2024-01-23 op void
 38 1ac119fb 2024-01-23 op empty_linelist(struct buffer *buffer)
 39 1ac119fb 2024-01-23 op {
 40 1ac119fb 2024-01-23 op 	struct line *l, *lt;
 41 1ac119fb 2024-01-23 op 
 42 1ac119fb 2024-01-23 op 	TAILQ_FOREACH_SAFE(l, &buffer->page.head, lines, lt) {
 43 1ac119fb 2024-01-23 op 		TAILQ_REMOVE(&buffer->page.head, l, lines);
 44 1ac119fb 2024-01-23 op 		free(l->line);
 45 1ac119fb 2024-01-23 op 
 46 1ac119fb 2024-01-23 op 		if (l->type != LINE_COMPL &&
 47 1ac119fb 2024-01-23 op 		    l->type != LINE_COMPL_CURRENT &&
 48 1ac119fb 2024-01-23 op 		    l->type != LINE_HELP)
 49 1ac119fb 2024-01-23 op 			free(l->alt);
 50 1ac119fb 2024-01-23 op 
 51 1ac119fb 2024-01-23 op 		free(l);
 52 1ac119fb 2024-01-23 op 	}
 53 1ac119fb 2024-01-23 op }
 54 1ac119fb 2024-01-23 op 
 55 1ac119fb 2024-01-23 op void
 56 1ac119fb 2024-01-23 op empty_vlist(struct buffer *buffer)
 57 1ac119fb 2024-01-23 op {
 58 1ac119fb 2024-01-23 op 	struct vline *vl, *t;
 59 1ac119fb 2024-01-23 op 
 60 1ac119fb 2024-01-23 op 	buffer->top_line = NULL;
 61 1ac119fb 2024-01-23 op 	buffer->line_off = 0;
 62 1ac119fb 2024-01-23 op 	buffer->current_line = NULL;
 63 1ac119fb 2024-01-23 op 	buffer->line_max = 0;
 64 1ac119fb 2024-01-23 op 
 65 1ac119fb 2024-01-23 op 	TAILQ_FOREACH_SAFE(vl, &buffer->head, vlines, t) {
 66 1ac119fb 2024-01-23 op 		TAILQ_REMOVE(&buffer->head, vl, vlines);
 67 1ac119fb 2024-01-23 op 		free(vl);
 68 1ac119fb 2024-01-23 op 	}
 69 1ac119fb 2024-01-23 op }
 70 1ac119fb 2024-01-23 op 
 71 1ac119fb 2024-01-23 op static int
 72 1ac119fb 2024-01-23 op push_line(struct buffer *buffer, struct line *l, const char *buf, size_t len, int flags)
 73 1ac119fb 2024-01-23 op {
 74 1ac119fb 2024-01-23 op 	struct vline *vl;
 75 1ac119fb 2024-01-23 op 	const char *end;
 76 1ac119fb 2024-01-23 op 
 77 1ac119fb 2024-01-23 op 	/* omit trailing spaces */
 78 1ac119fb 2024-01-23 op 	if (len != 0) {
 79 1ac119fb 2024-01-23 op 		for (end = buf + len - 1;
 80 1ac119fb 2024-01-23 op 		     end > buf && isspace(*end);
 81 1ac119fb 2024-01-23 op 		     end--, len--)
 82 1ac119fb 2024-01-23 op 			;	/* nop */
 83 1ac119fb 2024-01-23 op 	}
 84 1ac119fb 2024-01-23 op 
 85 1ac119fb 2024-01-23 op 	if (!(l->flags & L_HIDDEN))
 86 1ac119fb 2024-01-23 op 		buffer->line_max++;
 87 1ac119fb 2024-01-23 op 
 88 1ac119fb 2024-01-23 op 	if ((vl = calloc(1, sizeof(*vl))) == NULL)
 89 1ac119fb 2024-01-23 op 		return 0;
 90 1ac119fb 2024-01-23 op 
 91 1ac119fb 2024-01-23 op 	vl->parent = l;
 92 1ac119fb 2024-01-23 op 	if (len != 0) {
 93 1ac119fb 2024-01-23 op 		vl->from = buf - l->line;
 94 1ac119fb 2024-01-23 op 		vl->len = len;
 95 1ac119fb 2024-01-23 op 		vl->cplen = utf8_ncplen(buf, vl->len);
 96 1ac119fb 2024-01-23 op 	}
 97 1ac119fb 2024-01-23 op 	vl->flags = flags;
 98 1ac119fb 2024-01-23 op 
 99 1ac119fb 2024-01-23 op 	TAILQ_INSERT_TAIL(&buffer->head, vl, vlines);
100 1ac119fb 2024-01-23 op 	return 1;
101 1ac119fb 2024-01-23 op }
102 1ac119fb 2024-01-23 op 
103 1ac119fb 2024-01-23 op /*
104 1ac119fb 2024-01-23 op  * Build a list of visual line by wrapping the given line, assuming
105 1ac119fb 2024-01-23 op  * that when printed will have a leading prefix prfx.
106 1ac119fb 2024-01-23 op  */
107 1ac119fb 2024-01-23 op int
108 1ac119fb 2024-01-23 op wrap_text(struct buffer *buffer, const char *prfx, struct line *l,
109 1ac119fb 2024-01-23 op     size_t width, int oneline)
110 1ac119fb 2024-01-23 op {
111 1ac119fb 2024-01-23 op 	const char	*line, *space;
112 1ac119fb 2024-01-23 op 	size_t		 ret, off, start, cur, prfxwidth;
113 1ac119fb 2024-01-23 op 	int		 flags;
114 1ac119fb 2024-01-23 op 
115 1ac119fb 2024-01-23 op 	if ((line = l->line) == NULL || *line == '\0')
116 1ac119fb 2024-01-23 op 		return push_line(buffer, l, NULL, 0, 0);
117 1ac119fb 2024-01-23 op 
118 1ac119fb 2024-01-23 op 	prfxwidth = utf8_swidth(prfx);
119 1ac119fb 2024-01-23 op 	cur = prfxwidth;
120 1ac119fb 2024-01-23 op 	start = 0;
121 1ac119fb 2024-01-23 op 	flags = 0;
122 1ac119fb 2024-01-23 op 
123 1ac119fb 2024-01-23 op 	if (l->type == LINE_LINK && emojify_link &&
124 1ac119fb 2024-01-23 op 	    emojied_line(l->line, &space)) {
125 1ac119fb 2024-01-23 op 	    	prfxwidth = utf8_swidth_between(l->line, space);
126 1ac119fb 2024-01-23 op 		cur = prfxwidth;
127 1ac119fb 2024-01-23 op 		line = space + 1;
128 1ac119fb 2024-01-23 op 	}
129 1ac119fb 2024-01-23 op 
130 1ac119fb 2024-01-23 op 	for (off = 0; line[off] != '\0'; off += ret) {
131 1ac119fb 2024-01-23 op 		size_t t;
132 1ac119fb 2024-01-23 op 
133 1ac119fb 2024-01-23 op 		ret = grapheme_next_line_break_utf8(&line[off], SIZE_MAX);
134 1ac119fb 2024-01-23 op 		t = utf8_swidth_between(&line[off], &line[off + ret]);
135 1ac119fb 2024-01-23 op 
136 1ac119fb 2024-01-23 op 		if (cur + t <= width) {
137 1ac119fb 2024-01-23 op 			cur += t;
138 1ac119fb 2024-01-23 op 			continue;
139 1ac119fb 2024-01-23 op 		}
140 1ac119fb 2024-01-23 op 
141 1ac119fb 2024-01-23 op 		if (!push_line(buffer, l, &line[start], off - start, flags))
142 1ac119fb 2024-01-23 op 			return 0;
143 1ac119fb 2024-01-23 op 
144 1ac119fb 2024-01-23 op 		if (oneline)
145 1ac119fb 2024-01-23 op 			return 0;
146 1ac119fb 2024-01-23 op 
147 1ac119fb 2024-01-23 op 		flags = L_CONTINUATION;
148 1ac119fb 2024-01-23 op 		start = off;
149 1ac119fb 2024-01-23 op 		cur = t + prfxwidth;
150 1ac119fb 2024-01-23 op 	}
151 1ac119fb 2024-01-23 op 
152 1ac119fb 2024-01-23 op 	if (off != start)
153 1ac119fb 2024-01-23 op 		return push_line(buffer, l, &line[start], off - start, flags);
154 1ac119fb 2024-01-23 op 	return 0;
155 1ac119fb 2024-01-23 op }
156 1ac119fb 2024-01-23 op 
157 1ac119fb 2024-01-23 op int
158 1ac119fb 2024-01-23 op wrap_page(struct buffer *buffer, int width)
159 1ac119fb 2024-01-23 op {
160 1ac119fb 2024-01-23 op 	struct line		*l;
161 1ac119fb 2024-01-23 op 	const struct line	*top_orig, *orig;
162 1ac119fb 2024-01-23 op 	struct vline		*vl;
163 1ac119fb 2024-01-23 op 	const char		*prfx;
164 1ac119fb 2024-01-23 op 
165 1ac119fb 2024-01-23 op 	top_orig = buffer->top_line == NULL ? NULL : buffer->top_line->parent;
166 1ac119fb 2024-01-23 op 	orig = buffer->current_line == NULL ? NULL : buffer->current_line->parent;
167 1ac119fb 2024-01-23 op 
168 1ac119fb 2024-01-23 op 	buffer->top_line = NULL;
169 1ac119fb 2024-01-23 op 	buffer->current_line = NULL;
170 1ac119fb 2024-01-23 op 
171 1ac119fb 2024-01-23 op 	buffer->force_redraw = 1;
172 1ac119fb 2024-01-23 op 	buffer->curs_y = 0;
173 1ac119fb 2024-01-23 op 	buffer->line_off = 0;
174 1ac119fb 2024-01-23 op 
175 1ac119fb 2024-01-23 op 	empty_vlist(buffer);
176 1ac119fb 2024-01-23 op 
177 1ac119fb 2024-01-23 op 	TAILQ_FOREACH(l, &buffer->page.head, lines) {
178 1ac119fb 2024-01-23 op 		prfx = line_prefixes[l->type].prfx1;
179 1ac119fb 2024-01-23 op 		switch (l->type) {
180 1ac119fb 2024-01-23 op 		case LINE_TEXT:
181 1ac119fb 2024-01-23 op 		case LINE_LINK:
182 1ac119fb 2024-01-23 op 		case LINE_TITLE_1:
183 1ac119fb 2024-01-23 op 		case LINE_TITLE_2:
184 1ac119fb 2024-01-23 op 		case LINE_TITLE_3:
185 1ac119fb 2024-01-23 op 		case LINE_ITEM:
186 1ac119fb 2024-01-23 op 		case LINE_QUOTE:
187 1ac119fb 2024-01-23 op 		case LINE_PRE_START:
188 1ac119fb 2024-01-23 op 		case LINE_PRE_END:
189 1ac119fb 2024-01-23 op 		case LINE_PRE_CONTENT:
190 1ac119fb 2024-01-23 op 		case LINE_PATCH:
191 1ac119fb 2024-01-23 op 		case LINE_PATCH_HDR:
192 1ac119fb 2024-01-23 op 		case LINE_PATCH_HUNK_HDR:
193 1ac119fb 2024-01-23 op 		case LINE_PATCH_ADD:
194 1ac119fb 2024-01-23 op 		case LINE_PATCH_DEL:
195 1ac119fb 2024-01-23 op 			wrap_text(buffer, prfx, l, MIN(fill_column, width),
196 1ac119fb 2024-01-23 op 			    0);
197 1ac119fb 2024-01-23 op 			break;
198 1ac119fb 2024-01-23 op 		case LINE_COMPL:
199 1ac119fb 2024-01-23 op 		case LINE_COMPL_CURRENT:
200 1ac119fb 2024-01-23 op 		case LINE_HELP:
201 1ac119fb 2024-01-23 op 		case LINE_DOWNLOAD:
202 1ac119fb 2024-01-23 op 		case LINE_DOWNLOAD_DONE:
203 1ac119fb 2024-01-23 op 		case LINE_DOWNLOAD_INFO:
204 1ac119fb 2024-01-23 op 			wrap_text(buffer, prfx, l, width, 1);
205 1ac119fb 2024-01-23 op 			break;
206 1ac119fb 2024-01-23 op 		case LINE_FRINGE:
207 1ac119fb 2024-01-23 op 			/* never, ever wrapped */
208 1ac119fb 2024-01-23 op 			break;
209 1ac119fb 2024-01-23 op 		}
210 1ac119fb 2024-01-23 op 
211 1ac119fb 2024-01-23 op 		if (top_orig == l && buffer->top_line == NULL) {
212 1ac119fb 2024-01-23 op 			buffer->line_off = buffer->line_max-1;
213 1ac119fb 2024-01-23 op 			buffer->top_line = TAILQ_LAST(&buffer->head, vhead);
214 1ac119fb 2024-01-23 op 
215 1ac119fb 2024-01-23 op 			while (1) {
216 1ac119fb 2024-01-23 op 				vl = TAILQ_PREV(buffer->top_line, vhead, vlines);
217 1ac119fb 2024-01-23 op 				if (vl == NULL || vl->parent != orig)
218 1ac119fb 2024-01-23 op 					break;
219 1ac119fb 2024-01-23 op 				buffer->top_line = vl;
220 1ac119fb 2024-01-23 op 				buffer->line_off--;
221 1ac119fb 2024-01-23 op 			}
222 1ac119fb 2024-01-23 op 		}
223 1ac119fb 2024-01-23 op 
224 1ac119fb 2024-01-23 op 		if (orig == l && buffer->current_line == NULL) {
225 1ac119fb 2024-01-23 op 			buffer->current_line = TAILQ_LAST(&buffer->head, vhead);
226 1ac119fb 2024-01-23 op 
227 1ac119fb 2024-01-23 op 			while (1) {
228 1ac119fb 2024-01-23 op 				vl = TAILQ_PREV(buffer->current_line, vhead, vlines);
229 1ac119fb 2024-01-23 op 				if (vl == NULL || vl->parent != orig)
230 1ac119fb 2024-01-23 op 					break;
231 1ac119fb 2024-01-23 op 				buffer->current_line = vl;
232 1ac119fb 2024-01-23 op 			}
233 1ac119fb 2024-01-23 op 		}
234 1ac119fb 2024-01-23 op 	}
235 1ac119fb 2024-01-23 op 
236 1ac119fb 2024-01-23 op 	if (buffer->current_line == NULL)
237 1ac119fb 2024-01-23 op 		buffer->current_line = TAILQ_FIRST(&buffer->head);
238 1ac119fb 2024-01-23 op 
239 1ac119fb 2024-01-23 op 	if (buffer->top_line == NULL)
240 1ac119fb 2024-01-23 op 		buffer->top_line = buffer->current_line;
241 1ac119fb 2024-01-23 op 
242 1ac119fb 2024-01-23 op 	return 1;
243 1ac119fb 2024-01-23 op }