Add Lua function that returns the current time

src/util/time.cpp

@@ -215,6 +215,13 @@ scripting::ScriptEngine::LuaLibrary Time::luaLibrary() {
                 "",
                 "Returns the current time as an ISO 8601 date string "
                 "(YYYY-MM-DDTHH:MN:SS)"
+            },
+            {
+                "currentWallTime",
+                &luascriptfunctions::time_currentWallTime,
+                "",
+                "Returns the current wall time as an ISO 8601 date string "
+                "(YYYY-MM-DDTHH-MN-SS) in the UTC timezone"
             }
         }
     };

src/util/time_lua.inl

@@ -22,6 +22,10 @@
  * OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                                         *
  ****************************************************************************************/
 
+#include <ghoul/misc/assert.h>
+#include <ctime>
+#include <cppformat/format.h>
+
 namespace openspace {
 
 namespace luascriptfunctions {
@@ -149,6 +153,29 @@ int time_currentTimeUTC(lua_State* L) {
     return 1;
 }
 
+/**
+ * \ingroup LuaScripts
+ * currentWallTime():
+ * Returns the current wallclock time as a structured ISO 8601 string in the UTC timezone.
+ */
+int time_currentWallTime(lua_State* L) {
+    std::time_t t = std::time(nullptr);
+    std::tm* utcTime = std::gmtime(&t);
+    ghoul_assert(utcTime, "Conversion to UTC failed");
+
+    std::string time = fmt::format(
+        "{:04d}-{:02d}-{:02d}T{:02d}:{:02d}:{:02d}",
+        utcTime->tm_year + 1900,
+        utcTime->tm_mon + 1,
+        utcTime->tm_mday,
+        utcTime->tm_hour,
+        utcTime->tm_min,
+        utcTime->tm_sec
+    );
+    lua_pushstring(L, time.c_str());
+    return 1;
+}
+
 } // namespace luascriptfunctions
 
 } // namespace openspace