Extract feed_info struct and save routine to its own file

Also start creating basic framework for config

feed_info.c

@@ -0,0 +1,56 @@
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+
+#include <concord/discord.h>
+#include <concord/log.h>
+
+#include "config.h"
+#include "feed_info.h"
+
+void feed_info_free(feed_info *feed) {
+	free(feed->title);
+	free(feed->url);
+	free(feed->last_pubDate);
+	free(feed);
+}
+
+const char *feed_info_strerror(feed_info_err error) {
+	static_assert(FEED_INFO_ERRORCOUNT == 3, "Not all feed info errors implemented");
+	switch (error) {
+		case FEED_INFO_OK: {
+			return "OK";
+		}
+		case FEED_INFO_FILEERROR: {
+			return strerror(errno);
+		}
+		case FEED_INFO_NULL: {
+			return "No feed info was provided";
+		}
+		default: {
+			return "Unspecified error";
+		}
+	}
+}
+
+/*
+ * Reads feed info for given information from file and puts it in the provided struct
+ */
+feed_info_err feed_info_save_file(feed_info *feed) {
+	if (!feed) return FEED_INFO_NULL;
+	
+	char file_path[PATH_MAX];
+	// maybe check if we ran out of characters for path?
+	snprintf(file_path, sizeof(file_path), "%s/%lu/%lu/%x", zblock_config.database_path, feed->guild_id, feed->channel_id, feed->feed_id);
+	
+	FILE *fp = fopen(file_path, "w");
+	if (!fp) return FEED_INFO_FILEERROR;
+	fprintf(fp, "title=%s\nurl=%s\nlast_pubDate=%s\n", feed->title, feed->url, feed->last_pubDate);
+	fclose(fp);
+}
+
+feed_info_err feed_info_load_file(u64snowflake guild_id, u64snowflake channel_id, unsigned feed_id, feed_info *feed) {
+	assert(0 && "not implemented yet");
+}