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UI/nvim_ui_attach(): add override option

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Before now, Nvim always degrades UI capabilities to the lowest-common
denominator. For example, if any connected UI has `ext_messages=false`
then `ext_messages=true` requested by any other connected UI is ignored.

Now `nvim_ui_attach()` supports `override=true`, which flips the
behavior: if any UI requests an `ext_*` UI capability then the
capability is enabled (and the legacy behavior is disabled).

Legacy UIs will be broken while a `override=true` UI is connected, but
it's useful for debugging: you can type into the TUI and observe the UI
events from another connected (UI) client. And the legacy UI will
"recover" after the `override=true` UI disconnects.

Example using pynvim:

    >>> n.ui_attach(2048, 2048, rgb=True, override=True, ext_multigrid=True, ext_messages=True, ext_popupmenu=True)
    >>> while True: n.next_message();
This commit is contained in:
Justin M. Keyes
2019-05-09 19:35:38 +02:00
parent 8330cc22af
commit b9ad12e6c2
9 changed files with 64 additions and 32 deletions
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10
src/nvim/api/ui.c
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@@ -110,6 +110,7 @@ void nvim_ui_attach(uint64_t channel_id, Integer width, Integer height,
ui->width = (int)width;
ui->height = (int)height;
ui->rgb = true;
ui->override = false;
ui->grid_resize = remote_ui_grid_resize;
ui->grid_clear = remote_ui_grid_clear;
ui->grid_cursor_goto = remote_ui_grid_cursor_goto;
@@ -236,6 +237,15 @@ void nvim_ui_set_option(uint64_t channel_id, String name,
static void ui_set_option(UI *ui, bool init, String name, Object value,
Error *error)
{
if (strequal(name.data, "override")) {
if (value.type != kObjectTypeBoolean) {
api_set_error(error, kErrorTypeValidation, "override must be a Boolean");
return;
}
ui->override = value.data.boolean;
return;
}
if (strequal(name.data, "rgb")) {
if (value.type != kObjectTypeBoolean) {
api_set_error(error, kErrorTypeValidation, "rgb must be a Boolean");