profile: redo eventname handling

The eventname handling code was splattered all over the place.
Collect it in a single source file and use C++ idioms to avoid
nasty memory management. Provide a C-only interface, however.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

core/eventname.cpp

@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: GPL-2.0
+#include "eventname.h"
+#include "subsurface-string.h"
+
+#include <string>
+#include <vector>
+#include <algorithm>
+
+struct event_name {
+	std::string name;
+	bool plot;
+};
+
+static std::vector<event_name> event_names;
+
+// Small helper so that we can compare events to C-strings
+static bool operator==(const event_name &en, const char *s)
+{
+	return en.name == s;
+}
+
+extern "C" void clear_event_names()
+{
+	event_names.clear();
+}
+
+extern "C" void remember_event_name(const char *eventname)
+{
+	if (empty_string(eventname))
+		return;
+	if (std::find(event_names.begin(), event_names.end(), eventname) != event_names.end())
+		return;
+	event_names.push_back({ eventname, true });
+}
+
+extern "C" bool is_event_hidden(const char *eventname)
+{
+	auto it = std::find(event_names.begin(), event_names.end(), eventname);
+	return it != event_names.end() && !it->plot;
+}
+
+extern "C" void hide_event(const char *eventname)
+{
+	auto it = std::find(event_names.begin(), event_names.end(), eventname);
+	if (it != event_names.end())
+		it->plot = false;
+}
+
+extern "C" void show_all_events()
+{
+	for (event_name &en: event_names)
+		en.plot = true;
+}
+
+extern "C" bool any_events_hidden()
+{
+	return std::any_of(event_names.begin(), event_names.end(),
+			   [] (const event_name &en) { return !en.plot; });
+}