Improved error message for irregular file types

When trashing an irregular file like a fifo pipe,
it cannot reliably be moved across filesystems.
Even cp seems to have issues with this.

Closes #12

source/trash/opers.d

@@ -62,7 +62,9 @@ int trashOrRm(in string path) {
     log("trashing: %s", tfile.orig_path);
 
     // Move the file to the trash files dir
-    path.renameOrCopy(tfile.file_path);
+    bool res = path.renameOrCopy(tfile.file_path);
+    if (!res)
+        return 1;
 
     // Write the .trashinfo file
     tfile.info_path.append(tfile.infoString);

source/trash/util.d

@@ -95,7 +95,7 @@ void createMissingFolders() {
    needed.
    Symlinks are NOT followed recursively
 */
-void renameOrCopy(in string src, in string tgt) {
+bool renameOrCopy(in string src, in string tgt) {
     try {
         // Bit of an odd workaround to prevent recursive trashing
         if (src.endsWith("/") && src.chop().isSymlink) {
@@ -120,9 +120,11 @@ void renameOrCopy(in string src, in string tgt) {
             }
             src.rmdir();
         } else {
-            err("path was neither file or directory");
+            err("'%s' is not a regular file and cannot be trashed across devices", src);
+            return false;
         }
     }
+    return true;
 }
 
 /**