Make menu accelerator keys work on Windows

src/tools/menu_accel.win.cpp

@@ -0,0 +1,73 @@
+
+#include "menu_accel.win.hpp"
+#include <sstream>
+
+void accel_table_t::add(WORD cmd, std::string key) {
+	size_t pos = 0;
+	bool ctrl = false, alt = false, shift = false;
+	while(true) {
+		if(key.substr(pos, 5) == "Ctrl+") {
+			ctrl = true;
+			pos += 5;
+		} else if(key.substr(pos, 4) == "Alt+") {
+			alt = true;
+			pos += 4;
+		} else if(key.substr(pos, 6) == "Shift+") {
+			shift = true;
+			pos += 6;
+		} else if(pos >= key.size()) return;
+		else break;
+	}
+	WORD keycode;
+	key = key.substr(pos);
+	if(key.length() == 0) return;
+	else if(key.length() == 1) {
+		SHORT virtkey = VkKeyScanA(key[0]);
+		keycode = LOBYTE(virtkey);
+	} else if(key[0] == 'F') {
+		std::istringstream parse;
+		parse.str(key.substr(1));
+		int fkey = -1;
+		parse >> fkey;
+		// We allow for 24 F-keys because that's how many VK_Fx constants there are
+		if(fkey <= 0 || fkey > 24)
+			return;
+		keycode = VK_F1 + fkey - 1;
+	} else if(key == "Backsp") keycode = VK_BACK;
+	else if(key == "Enter") keycode = VK_RETURN;
+	else if(key == "Tab") keycode = VK_TAB;
+	else if(key == "Esc") keycode = VK_ESCAPE;
+	else if(key == "PgUp") keycode = VK_PRIOR;
+	else if(key == "PgDn") keycode = VK_NEXT;
+	else if(key == "End") keycode = VK_END;
+	else if(key == "Home") keycode = VK_HOME;
+	else if(key == "Left") keycode = VK_LEFT;
+	else if(key == "Right") keycode = VK_RIGHT;
+	else if(key == "Up") keycode = VK_UP;
+	else if(key == "Down") keycode = VK_DOWN;
+	else if(key == "Del") keycode = VK_DELETE;
+	else return;
+	ACCEL accel;
+	accel.cmd = cmd;
+	accel.key = keycode;
+	accel.fVirt = FVIRTKEY;
+	if(ctrl) accel.fVirt |= FCONTROL;
+	if(alt) accel.fVirt |= FALT;
+	if(shift) accel.fVirt |= FSHIFT;
+	table.push_back(accel);
+}
+
+void accel_table_t::build() {
+	if(handle == NULL)
+		handle = CreateAcceleratorTable(table.data(), table.size());
+}
+
+void accel_table_t::destroy() {
+	if(handle != NULL)
+		DestroyAcceleratorTable(handle);
+	handle = NULL;
+}
+
+accel_table_t::~accel_table_t() {
+	destroy();
+}

src/tools/menu_accel.win.hpp

@@ -0,0 +1,12 @@
+
+#include <Windows.h>
+#include <vector>
+
+struct accel_table_t {
+	std::vector<ACCEL> table;
+	HACCEL handle = NULL;
+	void add(WORD cmd, std::string key);
+	void build();
+	void destroy();
+	~accel_table_t();
+};