Feature: Use real-time "wallclock" timekeeping units (#11341)

src/strgen/strgen_base.cpp

@@ -377,6 +377,33 @@ void EmitPlural(Buffer *buffer, char *buf, int)
 	EmitWordList(buffer, words, nw);
 }
 
+/**
+ * Handle the selection of timekeeping units based on the timekeeping setting.
+ * This uses the string control character {TKM [value if calendar] [value if wallclock]}, e.g. {TKM month minute}.
+ * @param buffer The output buffer
+ * @param buf    The input buffer
+ * @param        Unused
+ */
+void EmitTKM(Buffer* buffer, char* buf, int)
+{
+	/* The correct number of words is 2, but we'll check for more in case of typos. */
+	std::vector<const char *> words(3, nullptr);
+
+	/* Parse each string. */
+	uint nw = 0;
+	for (nw = 0; nw < 3; nw++) {
+		words[nw] = ParseWord(&buf);
+		if (words[nw] == nullptr) break;
+	}
+
+	/* Warn about the wrong number of parameters. */
+	if (nw != 2) {
+		StrgenFatal("%s: Invalid number of TKM options. Expecting %d, found %d.", _cur_ident, 2, nw);
+	}
+
+	buffer->AppendUtf8(SCC_TIMEKEEPING_MODE_LIST);
+	EmitWordList(buffer, words, 2);
+}
 
 void EmitGender(Buffer *buffer, char *buf, int)
 {