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
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
|
// This is an open source non-commercial project. Dear PVS-Studio, please check
// it. PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
#include "nvim/buffer_updates.h"
#include "nvim/memline.h"
#include "nvim/api/private/helpers.h"
#include "nvim/msgpack_rpc/channel.h"
#include "nvim/assert.h"
#include "nvim/buffer.h"
// Register a channel. Return True if the channel was added, or already added.
// Return False if the channel couldn't be added because the buffer is
// unloaded.
bool buf_updates_register(buf_T *buf, uint64_t channel_id, bool send_buffer)
{
// must fail if the buffer isn't loaded
if (buf->b_ml.ml_mfp == NULL) {
return false;
}
// count how many channels are currently watching the buffer
size_t size = kv_size(buf->update_channels);
if (size) {
for (size_t i = 0; i < size; i++) {
if (kv_A(buf->update_channels, i) == channel_id) {
// buffer is already registered ... nothing to do
return true;
}
}
}
// append the channelid to the list
kv_push(buf->update_channels, channel_id);
if (send_buffer) {
Array args = ARRAY_DICT_INIT;
args.size = 6;
args.items = xcalloc(sizeof(Object), args.size);
// the first argument is always the buffer handle
args.items[0] = BUFFER_OBJ(buf->handle);
args.items[1] = INTEGER_OBJ(buf_get_changedtick(buf));
// the first line that changed (zero-indexed)
args.items[2] = INTEGER_OBJ(0);
// the last line that was changed
args.items[3] = INTEGER_OBJ(-1);
Array linedata = ARRAY_DICT_INIT;
// collect buffer contents
STATIC_ASSERT(SIZE_MAX >= MAXLNUM, "size_t smaller than MAXLNUM");
size_t line_count = (size_t)buf->b_ml.ml_line_count;
if (line_count >= 1) {
linedata.size = line_count;
linedata.items = xcalloc(sizeof(Object), line_count);
buf_collect_lines(buf, line_count, 1, true, &linedata, NULL);
}
args.items[4] = ARRAY_OBJ(linedata);
args.items[5] = BOOLEAN_OBJ(false);
rpc_send_event(channel_id, "nvim_buf_lines_event", args);
} else {
buf_updates_changedtick_single(buf, channel_id);
}
return true;
}
void buf_updates_send_end(buf_T *buf, uint64_t channelid)
{
Array args = ARRAY_DICT_INIT;
args.size = 1;
args.items = xcalloc(sizeof(Object), args.size);
args.items[0] = BUFFER_OBJ(buf->handle);
rpc_send_event(channelid, "nvim_buf_detach_event", args);
}
void buf_updates_unregister(buf_T *buf, uint64_t channelid)
{
size_t size = kv_size(buf->update_channels);
if (!size) {
return;
}
// go through list backwards and remove the channel id each time it appears
// (it should never appear more than once)
size_t j = 0;
size_t found = 0;
for (size_t i = 0; i < size; i++) {
if (kv_A(buf->update_channels, i) == channelid) {
found++;
} else {
// copy item backwards into prior slot if needed
if (i != j) {
kv_A(buf->update_channels, j) = kv_A(buf->update_channels, i);
}
j++;
}
}
if (found) {
// remove X items from the end of the array
buf->update_channels.size -= found;
// make a new copy of the active array without the channelid in it
buf_updates_send_end(buf, channelid);
if (found == size) {
kv_destroy(buf->update_channels);
kv_init(buf->update_channels);
}
}
}
void buf_updates_unregister_all(buf_T *buf)
{
size_t size = kv_size(buf->update_channels);
if (size) {
for (size_t i = 0; i < size; i++) {
buf_updates_send_end(buf, kv_A(buf->update_channels, i));
}
kv_destroy(buf->update_channels);
kv_init(buf->update_channels);
}
}
void buf_updates_send_changes(buf_T *buf,
linenr_T firstline,
int64_t num_added,
int64_t num_removed,
bool send_tick)
{
// if one the channels doesn't work, put its ID here so we can remove it later
uint64_t badchannelid = 0;
// notify each of the active channels
for (size_t i = 0; i < kv_size(buf->update_channels); i++) {
uint64_t channelid = kv_A(buf->update_channels, i);
// send through the changes now channel contents now
Array args = ARRAY_DICT_INIT;
args.size = 6;
args.items = xcalloc(sizeof(Object), args.size);
// the first argument is always the buffer handle
args.items[0] = BUFFER_OBJ(buf->handle);
// next argument is b:changedtick
args.items[1] = send_tick ? INTEGER_OBJ(buf_get_changedtick(buf)) : NIL;
// the first line that changed (zero-indexed)
args.items[2] = INTEGER_OBJ(firstline - 1);
// the last line that was changed
args.items[3] = INTEGER_OBJ(firstline - 1 + num_removed);
// linedata of lines being swapped in
Array linedata = ARRAY_DICT_INIT;
if (num_added > 0) {
STATIC_ASSERT(SIZE_MAX >= MAXLNUM, "size_t smaller than MAXLNUM");
linedata.size = (size_t)num_added;
linedata.items = xcalloc(sizeof(Object), (size_t)num_added);
buf_collect_lines(buf, (size_t)num_added, firstline, true, &linedata,
NULL);
}
args.items[4] = ARRAY_OBJ(linedata);
args.items[5] = BOOLEAN_OBJ(false);
if (!rpc_send_event(channelid, "nvim_buf_lines_event", args)) {
// We can't unregister the channel while we're iterating over the
// update_channels array, so we remember its ID to unregister it at
// the end.
badchannelid = channelid;
}
}
// We can only ever remove one dead channel at a time. This is OK because the
// change notifications are so frequent that many dead channels will be
// cleared up quickly.
if (badchannelid != 0) {
ELOG("Disabling buffer updates for dead channel %"PRIu64, badchannelid);
buf_updates_unregister(buf, badchannelid);
}
}
void buf_updates_changedtick(buf_T *buf)
{
// notify each of the active channels
for (size_t i = 0; i < kv_size(buf->update_channels); i++) {
uint64_t channel_id = kv_A(buf->update_channels, i);
buf_updates_changedtick_single(buf, channel_id);
}
}
void buf_updates_changedtick_single(buf_T *buf, uint64_t channel_id)
{
Array args = ARRAY_DICT_INIT;
args.size = 2;
args.items = xcalloc(sizeof(Object), args.size);
// the first argument is always the buffer handle
args.items[0] = BUFFER_OBJ(buf->handle);
// next argument is b:changedtick
args.items[1] = INTEGER_OBJ(buf_get_changedtick(buf));
// don't try and clean up dead channels here
rpc_send_event(channel_id, "nvim_buf_changedtick_event", args);
}
|
