textDocument/definition for ctrl+click

1 files changed, 153 insertions, 0 deletions

diff --git a/ide-signature-help.c b/ide-signature-help.c
new file mode 100644
index 0000000..97dc8c3
--- /dev/null
+++ b/ide-signature-help.c
@@ -0,0 +1,153 @@
+// deals with textDocument/signatureHelp LSP requests
+
+static void signature_help_clear(SignatureHelp *help) {
+	for (int i = 0; i < help->signature_count; ++i) {
+		Signature sig = help->signatures[i];
+		free(sig.label_pre);
+		free(sig.label_active);
+		free(sig.label_post);
+	}
+	memset(help->signatures, 0, sizeof help->signatures);
+	help->signature_count = 0;
+}
+
+void signature_help_send_request(Ted *ted) {
+	SignatureHelp *help = &ted->signature_help;
+	Settings *settings = ted_active_settings(ted);
+	if (!settings->signature_help_enabled) {
+		signature_help_clear(help);
+		return;
+	}
+	TextBuffer *buffer = ted->active_buffer;
+	if (!buffer) {
+		signature_help_clear(help);
+		return;
+	}
+	LSP *lsp = buffer_lsp(buffer);
+	if (!lsp) {
+		signature_help_clear(help);
+		return;
+	}
+	LSPRequest request  = {.type = LSP_REQUEST_SIGNATURE_HELP};
+	LSPRequestSignatureHelp *s = &request.data.signature_help;
+	s->position = buffer_cursor_pos_as_lsp_document_position(buffer);
+	lsp_send_request(lsp, &request);
+	help->retrigger = false;
+}
+
+void signature_help_retrigger(Ted *ted) {
+	// don't just send the request here -- we don't want to send more than
+	// one request per frame.
+	ted->signature_help.retrigger = true;
+}
+
+void signature_help_open(Ted *ted, char32_t trigger) {
+	(void)trigger; // for now we don't send context
+	signature_help_send_request(ted);
+}
+
+bool signature_help_is_open(Ted *ted) {
+	return ted->signature_help.signature_count > 0;
+}
+
+
+void signature_help_close(Ted *ted) {
+	signature_help_clear(&ted->signature_help);
+}
+
+void signature_help_process_lsp_response(Ted *ted, const LSPResponse *response) {
+	Settings *settings = ted_active_settings(ted);
+	if (!settings->signature_help_enabled) return;
+	
+	if (response->request.type != LSP_REQUEST_SIGNATURE_HELP)
+		return;
+	SignatureHelp *help = &ted->signature_help;
+	const LSPResponseSignatureHelp *lsp_help = &response->data.signature_help;
+	u32 signature_count = arr_len(lsp_help->signatures);
+	if (signature_count > SIGNATURE_HELP_MAX)
+		signature_count = SIGNATURE_HELP_MAX;
+	
+	signature_help_clear(help);
+	for (u32 s = 0; s < signature_count; ++s) {
+		Signature *signature = &help->signatures[s];
+		LSPSignatureInformation *lsp_signature = &lsp_help->signatures[s];
+		
+		const char *label = lsp_response_string(response, lsp_signature->label);
+		size_t start = unicode_utf16_to_utf8_offset(label, lsp_signature->active_start);
+		size_t end   = unicode_utf16_to_utf8_offset(label, lsp_signature->active_end);
+		if (start == (size_t)-1) {
+			assert(0);
+			start = 0;
+		}
+		if (end == (size_t)-1) {
+			assert(0);
+			end = 0;
+		}
+		u32 active_start = (u32)start;
+		u32 active_end = (u32)end;
+		signature->label_pre = strn_dup(label, active_start);
+		signature->label_active = strn_dup(label + active_start, active_end - active_start);
+		signature->label_post = str_dup(label + active_end);
+	}
+	
+	help->signature_count = (u16)signature_count;
+}
+
+void signature_help_frame(Ted *ted) {
+	Settings *settings = ted_active_settings(ted);
+	if (!settings->signature_help_enabled)
+		return;
+	
+	SignatureHelp *help = &ted->signature_help;
+	if (help->retrigger)
+		signature_help_send_request(ted);
+	u16 signature_count = help->signature_count;
+	if (!signature_count)
+		return;
+	Font *font = ted->font;
+	Font *font_bold = ted->font_bold;
+	TextBuffer *buffer = ted->active_buffer;
+	if (!buffer)
+		return;
+	
+	u32 *colors = settings->colors;
+	float border = settings->border_thickness;
+	
+	float width = buffer->x2 - buffer->x1;
+	float height = FLT_MAX;
+	// make sure signature help doesn't take up too much space
+	while (1) {
+		height = font->char_height * signature_count;
+		if (height < (buffer->y2 - buffer->y1) * 0.25f)
+			break;
+		--signature_count;
+		if (signature_count == 0) return;
+	}
+	float x = buffer->x1, y = buffer->y2 - height;
+	gl_geometry_rect(rect_xywh(x, y - border, width, border),
+		colors[COLOR_AUTOCOMPLETE_BORDER]);
+	gl_geometry_rect(rect_xywh(x, y, width, height),
+		colors[COLOR_AUTOCOMPLETE_BG]);
+	
+	// draw the signatures
+	for (int s = 0; s < signature_count; ++s) {
+		const Signature *signature = &help->signatures[s];
+		TextRenderState state = text_render_state_default;
+		state.x = x;
+		state.y = y;
+		state.min_x = x;
+		state.min_y = y;
+		state.max_x = buffer->x2;
+		state.max_y = buffer->y2;
+		rgba_u32_to_floats(colors[COLOR_TEXT], state.color);
+		
+		text_utf8_with_state(font, &state, signature->label_pre);
+		text_utf8_with_state(font_bold, &state, signature->label_active);
+		text_utf8_with_state(font, &state, signature->label_post);
+		y += font->char_height;
+	}
+	
+	gl_geometry_draw();
+	text_render(font);
+	text_render(font_bold);
+}