[ADD] Help screen

src/Main.c

@@ -27,6 +27,27 @@ ParseeUptime(void)
     return UtilTsMillis() - start;
 }
 
+static const Argument arguments[] =
+{
+#define Argument(c, req, vdesc, desc) \
+    { \
+        .end = false, \
+        .argument = c, .value_req = req, \
+        .value_descr = vdesc, \
+        .description = desc \
+    },
+
+    Argument('H', true, "number", "Sets the number of HTTP threads")
+    Argument('J', true, "number", "Sets the number of XMPP threads")
+
+    Argument('g',false,NULL,"Generates a parsee.yaml AS file before exiting")
+    Argument('v',false,NULL,"Forces Parsee to print in a more verbose fashion")
+    Argument('h',false,NULL,"Generates an help screen(this one!)")
+
+    { .end = true }
+#undef Argument
+};
+
 int
 Main(Array *args, HashMap *env)
 {
@@ -51,6 +72,7 @@ Main(Array *args, HashMap *env)
 
     {
         ArgParseState state;
+        char *opts = ParseeGenerateGetopt(arguments);
         int flag;
         int xmpp = 8;
         int http = 8;
@@ -58,10 +80,14 @@ Main(Array *args, HashMap *env)
         ArgParseStateInit(&state);
         /* TODO: Have a smarter way of generating the arg table 
          * (with a list of structs, with a description and everything) */
-        while ((flag = ArgParse(&state, args, "vgH:J:")) != -1)
+        while ((flag = ArgParse(&state, args, opts)) != -1)
         {
             switch (flag)
             {
+                case 'h':
+                    ParseeGenerateHelp(arguments);
+                    Free(opts);
+                    goto end;
                 case 'H':
                     http = strtol(state.optArg, NULL, 10);
                     break;
@@ -74,15 +100,18 @@ Main(Array *args, HashMap *env)
                     yaml = StreamOpen("parsee.yaml", "w");
                     ParseeExportConfigYAML(yaml);
                     StreamClose(yaml);
+                    Free(opts);
                     goto end;
                 case 'v':
                     LogConfigLevelSet(LogConfigGlobal(), LOG_DEBUG);
                     break;
                 case '?':
                     Log(LOG_ERR, "INVALID ARGUMENT GIVEN");
+                    Free(opts);
                     goto end;
             }
         }
+        Free(opts);
         ParseeSetThreads(xmpp, http);
     }
 

src/Parsee/Data.c

@@ -875,3 +875,52 @@ ParseeGenerateMTO(char *common_id)
 
     return matrix_to;
 }
+
+
+void
+ParseeGenerateHelp(const Argument *list)
+{
+    if (!list)
+    {
+        return;
+    }
+
+    while (!list->end)
+    {
+        char *str = list->value_req ?
+            StrConcat(3, " [", list->value_descr, "]") :
+            StrDuplicate("");
+        Log(LOG_INFO, "-%c%s", list->argument, str);
+        LogConfigIndent(LogConfigGlobal());
+        Log(LOG_INFO, "%s", list->description);
+        LogConfigUnindent(LogConfigGlobal());
+        list++;
+
+        Free(str);
+    }
+    return;
+}
+char *
+ParseeGenerateGetopt(const Argument *list)
+{
+    char *ret = NULL, *tmp = NULL;
+    if (!list)
+    {
+        return NULL;
+    }
+
+    while (!list->end)
+    {
+        char buffer[3] = {
+            list->argument, list->value_req ? ':' : '\0',
+            '\0'
+        };
+
+        tmp = ret;
+        ret = StrConcat(2, ret, buffer);
+        Free(tmp);
+
+        list++;
+    }
+    return ret;
+}

src/include/Parsee.h

@@ -58,6 +58,16 @@ typedef struct ParseeData {
     char *id;
 } ParseeData;
 
+typedef struct Argument {
+    bool end;
+
+    char argument;
+    bool value_req;
+
+    const char *value_descr;
+    const char *description;
+} Argument;
+
 #define GrabString(obj, ...) JsonValueAsString(JsonGet(obj, __VA_ARGS__))
 #define GrabInteger(obj, ...) JsonValueAsInteger(JsonGet(obj, __VA_ARGS__))
 #define GrabBoolean(obj, ...) JsonValueAsBoolean(JsonGet(obj, __VA_ARGS__))
@@ -76,6 +86,19 @@ typedef struct ParseeData {
 #define MB                  * 1024 KB
 #define GB                  * 1024 MB
 
+/** Generates a valid, getopt-style argument list from a end-terminated 
+ * argument list.
+ * ------------
+ * Returns: a valid string to be used in getopt and the likes[HEAP]
+ * Modifies: NOTHING */
+extern char * ParseeGenerateGetopt(const Argument *list);
+
+/** Generates a help screen to the logger.
+ * ------------
+ * Returns: NOTHING
+ * Modifies: NOTHING */
+extern void ParseeGenerateHelp(const Argument *list);
+
 /* Initialises a Parsee config from scratch, and writes to it 
  * as JSON in the CWD. */
 extern void ParseeConfigInit(void);