allow to change the mod loading order

src/main.c

@@ -62,6 +62,7 @@ int usage() {
 	printf("Use --deploy or -d <APPID> to deploy the mods for the game\n");
 	printf("Use --unbind <APPID> to rollback a deployment\n");
 	printf("Use --fomod <APPID> <MODID> to create a new mod using the result from the FOMod\n");
+	printf("Use --swap <APPID> <MODID A> MODID B> to swap two mod in the loading order\n");
 	return EXIT_FAILURE;
 }
 
@@ -489,6 +490,22 @@ int fomod(int argc, char ** argv) {
 	return returnValue;
 }
 
+int swapMod(int argc, char ** argv) {
+	if(argc != 5) return usage();
+	char * appIdStr = argv[2];
+	int appid = validateAppId(appIdStr);
+	if(appid < 0) {
+		printf("Invalid appid");
+		return EXIT_FAILURE;
+	}
+
+
+	//no mod will go over the MAX_INT value
+	int modIdA = (int)strtoul(argv[3], NULL, 10);
+	int modIdB = (int)strtoul(argv[4], NULL, 10);
+	return swapPlace(appid, modIdA, modIdB);
+}
+
 int main(int argc, char ** argv) {
 	if(argc < 2 ) return usage();
 
@@ -589,6 +606,12 @@ int main(int argc, char ** argv) {
 		else
 			returnValue = removeMod(argc, argv);
 
+	} else if(strcmp(argv[1], "--swap") == 0 || strcmp(argv[1], "-s") == 0) {
+		if(isRoot())
+			returnValue = noRoot();
+		else
+			returnValue = swapMod(argc, argv);
+
 	} else {
 		usage();
 		returnValue = EXIT_FAILURE;

src/order.c

@@ -1,4 +1,5 @@
 #include <stdio.h>
+#include <stdlib.h>
 #include "order.h"
 
 //no function are declared in main it's just macros
@@ -92,9 +93,51 @@ GList * listMods(int appid) {
 }
 
 
-void swapPlace(int appid, int modId, int modId2) {
+int swapPlace(int appid, int modIdA, int modIdB) {
-	GList * list = listMods(appid);
+	char appidStr[10];
+	sprintf(appidStr, "%d", appid);
 
+	char * home = getHome();
+	char * modFolder = g_build_filename(home, MANAGER_FILES, MOD_FOLDER_NAME, appidStr, NULL);
+	free(home);
+
+	GList * list = listMods(appid);
+	GList * listA = list;
+	GList * listB = list;
+
+	for(int i = 0; i < modIdA; i++) {
+		listA = g_list_next(listA);
+	}
+
+	for(int i = 0; i < modIdB; i++) {
+		listB = g_list_next(listB);
+	}
+
+	if(listA == NULL || listB == NULL) {
+		printf("Invalid modId\n");
+		return EXIT_FAILURE;
+	}
+
+	char * modAFolder = g_build_filename(modFolder, listA->data, ORDER_FILE, NULL);
+	char * modBFolder = g_build_filename(modFolder, listB->data, ORDER_FILE, NULL);
+
+	FILE * fileA = fopen(modAFolder, "w");
+	FILE * fileB = fopen(modBFolder, "w");
+
+	g_free(modAFolder);
+	g_free(modBFolder);
+
+	if(fileA == NULL || fileB == NULL) {
+		fprintf(stderr, "Error could not open order file\n");
+		return EXIT_FAILURE;
+	}
+
+	fprintf(fileA, "%d", modIdB);
+	fprintf(fileB, "%d", modIdA);
+
+	fclose(fileA);
+	fclose(fileB);
 
 	g_list_free(list);
+	return EXIT_SUCCESS;
 }

src/order.h

@@ -24,6 +24,6 @@ GList * listMods(int appid);
  * @param modId
  * @param modId2
  */
-void swapPlace(int appid, int modId, int modId2);
+int swapPlace(int appid, int modId, int modId2);
 
 #endif