Fix tree permissions bug

There was a bug where if you tried to recurse into a directory you didn’t have permission to read the contents of, the error would be ignored.

It now displays the errors.

src/output/details.rs

@@ -209,8 +209,9 @@ impl<'a> Render<'a> {
 
                     if let Some(r) = self.recurse {
                         if file.is_directory() && r.tree && !r.is_too_deep(depth.0) {
-                            if let Ok(d) = file.to_dir(false) {
-                                dir = Some(d);
+                            match file.to_dir(false) {
+                                Ok(d)  => { dir = Some(d); },
+                                Err(e) => { errors.push((e, None)) },
                             }
                         }
                     };

xtests/attributes

@@ -2,40 +2,49 @@
 drwxrwxr-x  - cassowary  1 Jan 12:34 ├── dirs
 drwxrwxr-x  - cassowary  1 Jan 12:34 │  ├── no-xattrs_empty
 d---------  - cassowary  1 Jan 12:34 │  ├── no-xattrs_empty_forbidden
+                                     │  │  └── <Permission denied (os error 13)>
 drwxrwxr-x  - cassowary  1 Jan 12:34 │  ├── no-xattrs_one-file
 .rw-rw-r--  0 cassowary  1 Jan 12:34 │  │  └── file-in-question
 d---------  - cassowary  1 Jan 12:34 │  ├── no-xattrs_one-file_forbidden
+                                     │  │  └── <Permission denied (os error 13)>
 drwxrwxr-x  - cassowary  1 Jan 12:34 │  ├── no-xattrs_two-files
 .rw-rw-r--  0 cassowary  1 Jan 12:34 │  │  ├── that-file
 .rw-rw-r--  0 cassowary  1 Jan 12:34 │  │  └── this-file
 d---------  - cassowary  1 Jan 12:34 │  ├── no-xattrs_two-files_forbidden
+                                     │  │  └── <Permission denied (os error 13)>
 drwxrwxr-x@ - cassowary  1 Jan 12:34 │  ├── one-xattr_empty
                                      │  │  └── user.greeting (len 5)
 d---------  - cassowary  1 Jan 12:34 │  ├── one-xattr_empty_forbidden
+                                     │  │  └── <Permission denied (os error 13)>
 drwxrwxr-x@ - cassowary  1 Jan 12:34 │  ├── one-xattr_one-file
                                      │  │  ├── user.greeting (len 5)
 .rw-rw-r--  0 cassowary  1 Jan 12:34 │  │  └── file-in-question
 d---------  - cassowary  1 Jan 12:34 │  ├── one-xattr_one-file_forbidden
+                                     │  │  └── <Permission denied (os error 13)>
 drwxrwxr-x@ - cassowary  1 Jan 12:34 │  ├── one-xattr_two-files
                                      │  │  ├── user.greeting (len 5)
 .rw-rw-r--  0 cassowary  1 Jan 12:34 │  │  ├── that-file
 .rw-rw-r--  0 cassowary  1 Jan 12:34 │  │  └── this-file
 d---------  - cassowary  1 Jan 12:34 │  ├── one-xattr_two-files_forbidden
+                                     │  │  └── <Permission denied (os error 13)>
 drwxrwxr-x@ - cassowary  1 Jan 12:34 │  ├── two-xattrs_empty
                                      │  │  ├── user.greeting (len 5)
                                      │  │  └── user.another_greeting (len 2)
 d---------  - cassowary  1 Jan 12:34 │  ├── two-xattrs_empty_forbidden
+                                     │  │  └── <Permission denied (os error 13)>
 drwxrwxr-x@ - cassowary  1 Jan 12:34 │  ├── two-xattrs_one-file
                                      │  │  ├── user.greeting (len 5)
                                      │  │  ├── user.another_greeting (len 2)
 .rw-rw-r--  0 cassowary  1 Jan 12:34 │  │  └── file-in-question
 d---------  - cassowary  1 Jan 12:34 │  ├── two-xattrs_one-file_forbidden
+                                     │  │  └── <Permission denied (os error 13)>
 drwxrwxr-x@ - cassowary  1 Jan 12:34 │  ├── two-xattrs_two-files
                                      │  │  ├── user.greeting (len 5)
                                      │  │  ├── user.another_greeting (len 2)
 .rw-rw-r--  0 cassowary  1 Jan 12:34 │  │  ├── that-file
 .rw-rw-r--  0 cassowary  1 Jan 12:34 │  │  └── this-file
 d---------  - cassowary  1 Jan 12:34 │  └── two-xattrs_two-files_forbidden
+                                     │     └── <Permission denied (os error 13)>
 drwxrwxr-x  - cassowary  1 Jan 12:34 └── files
 .rw-rw-r--  0 cassowary  1 Jan 12:34    ├── no-xattrs
 .---------  0 cassowary  1 Jan 12:34    ├── no-xattrs_forbidden