refactor: Package extension now depends on what compression method was detected.

src/package/vieter_package.c

@@ -185,11 +185,25 @@ char *vieter_package_to_description(vieter_package *pkg) {
   int i;
 
   // special case for FILENAME
-  // assuming .pkg.tar.zst; other formats are valid, this should account for
+  char *ext;
-  // that
+  switch (pkg->compression) {
+  case 0:
+    ext = ".tar";
+    break;
+  case 1:
+    ext = ".tar.gz";
+    break;
+  case 6:
+    ext = ".tar.xz";
+    break;
+  case 14:
+    ext = ".tar.zst";
+    break;
+  }
+
   size_to_be_written =
-      snprintf(aux, small_buff_size, "%%FILENAME%%\n%s-%s-%s.pkg.tar.zst",
+      snprintf(aux, small_buff_size, "%%FILENAME%%\n%s-%s-%s.pkg%s",
-               pkg_info->name, pkg_info->version, pkg_info->arch);
+               pkg_info->name, pkg_info->version, pkg_info->arch, ext);
 
   // We neither want to let an arbritrarily long input to overflow the buffer
   // nor to truncate perfectly valid inputs

test/package/test_package.c

@@ -78,6 +78,8 @@ void test_pkg_read_archive_desc() {
 	fclose(f);
 
 	TEST_CHECK(!strcmp(description, desc));
+
+	vieter_package_free(&pkg);
 }
 
 TEST_LIST = {