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#include "nvim/buffer_updates.h"
#include "nvim/memline.h"
#include "nvim/api/private/helpers.h"
#include "nvim/msgpack_rpc/channel.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 buffer_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);
Array linedata = ARRAY_DICT_INIT;
if (send_buffer) {
// collect buffer contents
size_t line_count = buf->b_ml.ml_line_count;
linedata.size = line_count;
linedata.items = xcalloc(sizeof(Object), line_count);
for (size_t i = 0; i < line_count; i++) {
linenr_T lnum = 1 + (linenr_T)i;
const char *bufstr = (char *)ml_get_buf(buf, lnum, false);
Object str = STRING_OBJ(cstr_to_string(bufstr));
// Vim represents NULs as NLs, but this may confuse clients.
strchrsub(str.data.string.data, '\n', '\0');
linedata.items[i] = str;
}
}
Array args = ARRAY_DICT_INIT;
args.size = 4;
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->b_changedtick);
args.items[2] = ARRAY_OBJ(linedata);
args.items[3] = BOOLEAN_OBJ(false);
rpc_send_event(channel_id, "nvim_buf_updates_start", args);
return true;
}
void buffer_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_updates_end", args);
}
void buffer_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
buffer_updates_send_end(buf, channelid);
if (found == size) {
kv_destroy(buf->update_channels);
kv_init(buf->update_channels);
}
}
}
void buffer_updates_unregister_all(buf_T *buf)
{
size_t size = kv_size(buf->update_channels);
if (size) {
for (size_t i = 0; i < size; i++) {
buffer_updates_send_end(buf, kv_A(buf->update_channels, i));
}
kv_destroy(buf->update_channels);
kv_init(buf->update_channels);
}
}
void buffer_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 = 5;
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->b_changedtick) : 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) {
linedata.size = num_added;
linedata.items = xcalloc(sizeof(Object), num_added);
for (int64_t i = 0; i < num_added; i++) {
int64_t lnum = firstline + i;
const char *bufstr = (char *)ml_get_buf(buf, (linenr_T)lnum, false);
Object str = STRING_OBJ(cstr_to_string(bufstr));
// Vim represents NULs as NLs, but this may confuse clients.
strchrsub(str.data.string.data, '\n', '\0');
linedata.items[i] = str;
}
}
args.items[4] = ARRAY_OBJ(linedata);
if (!rpc_send_event(channelid, "nvim_buf_update", 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 live updates for dead channel %llu", badchannelid);
buffer_updates_unregister(buf, badchannelid);
}
}
void buffer_updates_send_tick(buf_T *buf)
{
// 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 = 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->b_changedtick);
// don't try and clean up dead channels here
rpc_send_event(channelid, "nvim_buf_update_tick", args);
}
}
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