properly handle the fate of the directive file

README.md

@@ -91,8 +91,10 @@ Vimdir will terminate at the first sign of an error,
 but it has no way to roll-back your filesystem,
 so be careful.
 
+If Vimdir fails, the directive file is preserved and its path is returned to the user.
+
 You will not be able to manage files which have tab or newline characters in their names.
 If you have aforementioned files, please seek the help of a specialist.
 
-The first character of the permission string is simply in formative,
+The first character of the permission string is simply informative,
 its (changed) value is ignored.

documentation/TODO.md

@@ -14,3 +14,4 @@
 - [X] use `${VIMDIREDITOR}`
 - [ ] dry and moist tests
 - [ ] stdin / no order
+- [X] remove tempfile

source/main.c

@@ -52,11 +52,6 @@ int edit(const char * filename) {
     return 0;
 }
 
-void clean_up(void) {
-    free(folder);
-    deinit_directive_c();
-}
-
 signed main(int argc, char * * argv) {
     #define CHECK(x) do { \
             if ((r = x)) { \
@@ -99,7 +94,13 @@ signed main(int argc, char * * argv) {
     if (tmpfile) {
         fclose(tmpfile);
     }
-    clean_up();
+    if (!r) {
+        unlink(tmpfile_name);
+    } else {
+        notice("the location of the preserved directive file is '%s'", tmpfile_name);
+    }
+    free(folder);
+    deinit_directive_c();
     #undef CHECK
 
     return r;