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
|
#include "input.h"
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include "file.h"
#include "terminal.h"
#include "row.h"
int editor_read_key()
{
int read_count;
char c;
while ((read_count = read(STDIN_FILENO, &c, 1)) != 1) {
if (read_count == -1 && errno != EAGAIN)
die("read");
}
if (c == '\x1b') {
char seq[3];
if (read(STDIN_FILENO, &seq[0], 1) != 1) return '\x1b';
if (read(STDIN_FILENO, &seq[1], 1) != 1) return '\x1b';
if (seq[0] == '[') {
if (seq[1] >= '0' && seq[1] <= '9') {
if (read(STDIN_FILENO, &seq[2], 1) != 1)
return '\x1b';
if (seq[2] == '~') {
switch (seq[1]) {
case '1': return HOME_KEY;
case '3': return DELETE_KEY;
case '4': return END_KEY;
case '5': return PAGE_UP;
case '6': return PAGE_DOWN;
case '7': return HOME_KEY;
case '8': return END_KEY;
}
}
} else {
switch (seq[1]) {
case 'A': return ARROW_UP;
case 'B': return ARROW_DOWN;
case 'C': return ARROW_RIGHT;
case 'D': return ARROW_LEFT;
case 'H': return HOME_KEY;
case 'F': return END_KEY;
}
}
} else if (seq[0] == 'O') {
switch (seq[1]) {
case 'H': return HOME_KEY;
case 'F': return END_KEY;
}
}
return '\x1b';
} else {
return c;
}
}
void editor_move_cursor(struct editor_state* editor, int key)
{
struct editor_row* row = (editor->cursor_y >= editor->row_count) ? NULL : &editor->rows[editor->cursor_y];
switch (key) {
case ARROW_LEFT:
if (editor->cursor_x != 0) {
editor->cursor_x--;
} else if (editor->cursor_y > 0) {
editor->cursor_y--;
editor->cursor_x = editor->rows[editor->cursor_y].size;
}
break;
case ARROW_RIGHT:
if (row && editor->cursor_x < row->size) {
editor->cursor_x++;
} else if (row && editor->cursor_x == row->size) {
editor->cursor_y++;
editor->cursor_x = 0;
}
break;
case ARROW_UP:
if (editor->cursor_y != 0) editor->cursor_y--;
break;
case ARROW_DOWN:
if (editor->cursor_y != editor->row_count - 1) editor->cursor_y++;
break;
}
row = (editor->cursor_y >= editor->row_count) ? NULL : &editor->rows[editor->cursor_y];
int row_length = row ? row->size : 0;
if (editor->cursor_x > row_length)
editor->cursor_x = row_length;
}
void editor_process_keypress(struct editor_state* editor)
{
static int quit_message = 1;
int c = editor_read_key();
switch (c) {
case '\r':
editor_insert_newline(editor);
break;
case CTRL_KEY('q'):
if (editor->dirty && quit_message) {
editor_set_status_message(editor, "This file has unsaved changes. Press Ctrl+Q again to quit");
quit_message = 0;
return;
}
write(STDOUT_FILENO, "\x1b[2J", 4);
write(STDOUT_FILENO, "\x1b[H", 3);
exit(0);
break;
case CTRL_KEY('s'):
editor_save(editor);
break;
case HOME_KEY:
editor->cursor_x = 0;
break;
case END_KEY:
if (editor->cursor_y < editor->row_count)
editor->cursor_x = editor->rows[editor->cursor_y].size;
break;
case CTRL_KEY('f'):
editor_find(editor);
break;
case BACKSPACE:
case DELETE_KEY:
if (c == DELETE_KEY)
editor_move_cursor(editor, ARROW_RIGHT);
editor_delete_char(editor);
break;
case PAGE_UP:
case PAGE_DOWN:
{
if (c == PAGE_UP) {
editor->cursor_y = editor->row_offset;
} else {
editor->cursor_y = editor->row_offset + editor->screen_rows -1;
if (editor->cursor_y > editor->row_count)
editor->cursor_y = editor->row_count;
}
int times = editor->screen_rows;
while (times--)
editor_move_cursor(editor, c == PAGE_UP ? ARROW_UP : ARROW_DOWN);
}
break;
case ARROW_UP:
case ARROW_DOWN:
case ARROW_LEFT:
case ARROW_RIGHT:
editor_move_cursor(editor, c);
break;
case CTRL_KEY('l'):
case '\x1b':
break;
default:
editor_insert_char(editor, c);
break;
}
quit_message = 1;
}
|
