1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
#include "buffer.h"
#include "binding.h"
#include "display.h"
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
struct buffer buffer_create(const char *name) {
struct buffer b =
(struct buffer){.filename = NULL,
.name = name,
.text = text_create(10),
.dot_col = 0,
.dot_line = 0,
.modeline_buf = (uint8_t *)malloc(1024),
.keymaps = calloc(10, sizeof(struct keymap)),
.nkeymaps = 1,
.lines_rendered = -1,
.nkeymaps_max = 10};
b.keymaps[0] = keymap_create("buffer-default", 128);
struct binding bindings[] = {
BINDING(Ctrl, 'B', "backward-char"),
BINDING(Ctrl, 'F', "forward-char"),
BINDING(Ctrl, 'P', "backward-line"),
BINDING(Ctrl, 'N', "forward-line"),
BINDING(Ctrl, 'A', "beginning-of-line"),
BINDING(Ctrl, 'E', "end-of-line"),
BINDING(Ctrl, 'M', "newline"),
BINDING(Ctrl, '?', "backward-delete-char"),
};
keymap_bind_keys(&b.keymaps[0], bindings,
sizeof(bindings) / sizeof(bindings[0]));
return b;
}
void buffer_destroy(struct buffer *buffer) {
free(buffer->modeline_buf);
text_destroy(buffer->text);
free(buffer->text);
}
uint32_t buffer_keymaps(struct buffer *buffer, struct keymap **keymaps_out) {
*keymaps_out = buffer->keymaps;
return buffer->nkeymaps;
}
void buffer_add_keymap(struct buffer *buffer, struct keymap *keymap) {
if (buffer->nkeymaps == buffer->nkeymaps_max) {
// TODO: better
return;
}
buffer->keymaps[buffer->nkeymaps] = *keymap;
++buffer->nkeymaps;
}
bool movev(struct buffer *buffer, int rowdelta) {
int64_t new_line = (int64_t)buffer->dot_line + rowdelta;
if (new_line < 0) {
buffer->dot_line = 0;
return false;
} else if (new_line > text_num_lines(buffer->text) - 1) {
buffer->dot_line = text_num_lines(buffer->text) - 1;
return false;
} else {
buffer->dot_line = (uint32_t)new_line;
// make sure column stays on the line
uint32_t linelen = text_line_length(buffer->text, buffer->dot_line);
buffer->dot_col = buffer->dot_col > linelen ? linelen : buffer->dot_col;
return true;
}
}
// move dot `coldelta` chars
void moveh(struct buffer *buffer, int coldelta) {
int64_t new_col = (int64_t)buffer->dot_col + coldelta;
if (new_col > (int64_t)text_line_length(buffer->text, buffer->dot_line)) {
if (movev(buffer, 1)) {
buffer->dot_col = 0;
}
} else if (new_col < 0) {
if (movev(buffer, -1)) {
buffer->dot_col = text_line_length(buffer->text, buffer->dot_line);
}
} else {
buffer->dot_col = new_col;
}
}
void buffer_forward_delete_char(struct buffer *buffer) {
text_delete(buffer->text, buffer->dot_line, buffer->dot_col, 1);
}
void buffer_backward_delete_char(struct buffer *buffer) {
moveh(buffer, -1);
buffer_forward_delete_char(buffer);
}
void buffer_backward_char(struct buffer *buffer) { moveh(buffer, -1); }
void buffer_forward_char(struct buffer *buffer) { moveh(buffer, 1); }
void buffer_backward_line(struct buffer *buffer) { movev(buffer, -1); }
void buffer_forward_line(struct buffer *buffer) { movev(buffer, 1); }
void buffer_end_of_line(struct buffer *buffer) {
buffer->dot_col = text_line_length(buffer->text, buffer->dot_line);
}
void buffer_beginning_of_line(struct buffer *buffer) { buffer->dot_col = 0; }
struct buffer buffer_from_file(const char *filename) {
// TODO: create a reader for the file that calls add_text
return (struct buffer){.filename = filename, .name = filename};
}
int buffer_to_file(struct buffer *buffer) { return 0; }
int buffer_add_text(struct buffer *buffer, uint8_t *text, uint32_t nbytes) {
uint32_t lines_added, cols_added;
text_append(buffer->text, buffer->dot_line, buffer->dot_col, text, nbytes,
&lines_added, &cols_added);
movev(buffer, lines_added);
moveh(buffer, cols_added);
return lines_added;
}
void buffer_newline(struct buffer *buffer) {
buffer_add_text(buffer, (uint8_t *)"\n", 1);
}
bool modeline_update(struct buffer *buffer, uint32_t width) {
char buf[width * 4];
time_t now = time(NULL);
struct tm *lt = localtime(&now);
char left[128], right[128];
snprintf(left, 128, "--- %-16s (%d, %d)", buffer->name, buffer->dot_line + 1,
buffer->dot_col);
snprintf(right, 128, "%02d:%02d", lt->tm_hour, lt->tm_min);
snprintf(buf, width * 4, "\x1b[100m%s%*s%s\x1b[0m", left,
(int)(width - (strlen(left) + strlen(right))), "", right);
if (strcmp(buf, (char *)buffer->modeline_buf) != 0) {
buffer->modeline_buf = realloc(buffer->modeline_buf, width * 4);
strcpy((char *)buffer->modeline_buf, buf);
return true;
} else {
return false;
}
}
struct buffer_update buffer_begin_frame(struct buffer *buffer, uint32_t width,
uint32_t height, alloc_fn frame_alloc) {
// reserve space for modeline
uint32_t bufheight = height - 1;
uint32_t nlines =
buffer->lines_rendered > bufheight ? bufheight : buffer->lines_rendered;
struct render_cmd *cmds =
(struct render_cmd *)frame_alloc(sizeof(struct render_cmd) * (height));
uint32_t ncmds = text_render(buffer->text, 0, nlines, cmds, nlines);
buffer->lines_rendered = text_num_lines(buffer->text);
if (modeline_update(buffer, width)) {
cmds[ncmds] = (struct render_cmd){
.col = 0,
.row = height - 1,
.data = buffer->modeline_buf,
.len = strlen((char *)buffer->modeline_buf),
};
++ncmds;
}
return (struct buffer_update){.cmds = cmds, .ncmds = ncmds};
}
void buffer_end_frame(struct buffer *buffer, struct buffer_update *upd) {}
|
