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#define AUTOCOMPLETE_NCOMPLETIONS 10 // max # of completions to show
// get the thing to be completed (and what buffer it's in)
// returns false if this is a read only buffer or something
// call free() on *startp when you're done with it
static Status autocomplete_get(Ted *ted, char **startp, TextBuffer **bufferp) {
TextBuffer *buffer = ted->active_buffer;
if (buffer && !buffer->view_only && !buffer->is_line_buffer) {
buffer->selection = false;
if (is_word(buffer_char_after_cursor(buffer)))
buffer_cursor_move_right_words(buffer, 1);
else
buffer_scroll_to_cursor(buffer);
char *start = str32_to_utf8_cstr(buffer_word_at_cursor(buffer));
if (*start) {
*startp = start;
*bufferp = buffer;
return true;
} else {
// no word at cursor
free(start);
return false;
}
} else {
return false;
}
}
// do the actual completion
static void autocomplete_complete(Ted *ted, char *start, TextBuffer *buffer, char *completion) {
char *str = completion + strlen(start);
buffer_start_edit_chain(buffer); // don't merge with other edits
buffer_insert_utf8_at_cursor(buffer, str);
buffer_end_edit_chain(buffer);
ted->autocomplete = false;
}
static void autocomplete_select_cursor_completion(Ted *ted) {
char *start; TextBuffer *buffer;
if (autocomplete_get(ted, &start, &buffer)) {
char *completions[AUTOCOMPLETE_NCOMPLETIONS];
size_t ncompletions = tags_beginning_with(ted, start, completions, arr_count(completions));
if (ncompletions) {
i64 cursor = mod_i64(ted->autocomplete_cursor, (i64)ncompletions);
autocomplete_complete(ted, start, buffer, completions[cursor]);
for (size_t i = 0; i < ncompletions; ++i)
free(completions[i]);
}
free(start);
}
}
// open autocomplete, or just do the completion if there's only one suggestion
static void autocomplete_open(Ted *ted) {
char *start;
TextBuffer *buffer;
ted->cursor_error_time = 0;
ted->autocomplete_cursor = 0;
if (autocomplete_get(ted, &start, &buffer)) {
char *completions[2] = {0};
size_t ncompletions = tags_beginning_with(ted, start, completions, 2);
switch (ncompletions) {
case 0:
ted->cursor_error_time = time_get_seconds();
break;
case 1:
autocomplete_complete(ted, start, buffer, completions[0]);
break;
case 2:
// open autocomplete selection menu
ted->autocomplete = true;
break;
default: assert(0); break;
}
free(completions[0]);
free(completions[1]);
free(start);
}
}
static void autocomplete_frame(Ted *ted) {
char *start;
TextBuffer *buffer;
if (autocomplete_get(ted, &start, &buffer)) {
Font *font = ted->font;
float char_height = text_font_char_height(font);
Settings const *settings = buffer_settings(buffer);
u32 const *colors = settings->colors;
float const padding = settings->padding;
char *completions[AUTOCOMPLETE_NCOMPLETIONS];
size_t ncompletions = tags_beginning_with(ted, start, completions, arr_count(completions));
float menu_width = 400, menu_height = (float)ncompletions * char_height + 2 * padding;
if (ncompletions == 0) {
// no completions. close menu.
ted->autocomplete = false;
return;
}
ted->autocomplete_cursor = (i32)mod_i64(ted->autocomplete_cursor, (i64)ncompletions);
v2 cursor_pos = buffer_pos_to_pixels(buffer, buffer->cursor_pos);
bool open_up = cursor_pos.y > 0.5f * (buffer->y1 + buffer->y2); // should the completion menu open upwards?
bool open_left = cursor_pos.x > 0.5f * (buffer->x1 + buffer->x2);
float x = cursor_pos.x, start_y = cursor_pos.y;
if (open_left) x -= menu_width;
if (open_up)
start_y -= menu_height;
else
start_y += char_height; // put menu below cursor
{
Rect menu_rect = rect(V2(x, start_y), V2(menu_width, menu_height));
gl_geometry_rect(menu_rect, colors[COLOR_MENU_BG]);
//gl_geometry_rect_border(menu_rect, 1, colors[COLOR_BORDER]);
ted->autocomplete_rect = menu_rect;
}
// vertical padding
start_y += padding;
menu_height -= 2 * padding;
u16 cursor_entry = (u16)((ted->mouse_pos.y - start_y) / char_height);
if (cursor_entry < ncompletions) {
// highlight moused over entry
Rect r = rect(V2(x, start_y + cursor_entry * char_height), V2(menu_width, char_height));
gl_geometry_rect(r, colors[COLOR_MENU_HL]);
ted->cursor = ted->cursor_hand;
}
{ // highlight cursor entry
Rect r = rect(V2(x, start_y + (float)ted->autocomplete_cursor * char_height), V2(menu_width, char_height));
gl_geometry_rect(r, colors[COLOR_MENU_HL]);
}
for (uint i = 0; i < ted->nmouse_clicks[SDL_BUTTON_LEFT]; ++i) {
v2 click = ted->mouse_clicks[SDL_BUTTON_LEFT][i];
if (rect_contains_point(ted->autocomplete_rect, click)) {
u16 entry = (u16)((click.y - start_y) / char_height);
if (entry < ncompletions) {
// entry was clicked on! use this completion.
autocomplete_complete(ted, start, buffer, completions[entry]);
}
}
}
float y = start_y;
TextRenderState state = text_render_state_default;
state.min_x = x + padding; state.min_y = y; state.max_x = x + menu_width - padding; state.max_y = y + menu_height;
rgba_u32_to_floats(colors[COLOR_TEXT], state.color);
for (size_t i = 0; i < ncompletions; ++i) {
state.x = x + padding; state.y = y;
text_utf8_with_state(font, &state, completions[i]);
y += char_height;
}
gl_geometry_draw();
text_render(font);
for (size_t i = 0; i < ncompletions; ++i)
free(completions[i]);
free(start);
} else {
ted->autocomplete = false;
}
}
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