Global: support for named format arguments

Fix #796

src/modules/memory/memory.c

@@ -59,9 +59,9 @@ void ffPrintMemory(FFMemoryOptions* options)
         FF_STRBUF_AUTO_DESTROY percentageStr = ffStrbufCreate();
         ffPercentAppendNum(&percentageStr, percentage, options->percent, false, &options->moduleArgs);
         FF_PRINT_FORMAT_CHECKED(FF_MEMORY_MODULE_NAME, 0, &options->moduleArgs, FF_PRINT_TYPE_DEFAULT, FF_MEMORY_NUM_FORMAT_ARGS, ((FFformatarg[]){
-            {FF_FORMAT_ARG_TYPE_STRBUF, &usedPretty},
-            {FF_FORMAT_ARG_TYPE_STRBUF, &totalPretty},
-            {FF_FORMAT_ARG_TYPE_STRBUF, &percentageStr},
+            {FF_FORMAT_ARG_TYPE_STRBUF, &usedPretty, "used"},
+            {FF_FORMAT_ARG_TYPE_STRBUF, &totalPretty, "total"},
+            {FF_FORMAT_ARG_TYPE_STRBUF, &percentageStr, "percentage"},
         }));
     }
 }
@@ -128,9 +128,9 @@ void ffGenerateMemoryJsonResult(FF_MAYBE_UNUSED FFMemoryOptions* options, yyjson
 void ffPrintMemoryHelpFormat(void)
 {
     FF_PRINT_MODULE_FORMAT_HELP_CHECKED(FF_MEMORY_MODULE_NAME, "{1} / {2} ({3})", FF_MEMORY_NUM_FORMAT_ARGS, ((const char* []) {
-        "Used size",
-        "Total size",
-        "Percentage used",
+        "Used size - used",
+        "Total size - total",
+        "Percentage used - percentage",
     }));
 }