iterate over a directory, dealing with permission errors

[Spacen Jasset via Digitalmars-d]

On Friday, 18 September 2015 at 14:35:39 UTC, Dmitry Olshansky 
wrote:
> On 18-Sep-2015 15:03, Adrian Matoga wrote:
>> On Friday, 18 September 2015 at 11:35:45 UTC, John Colvin 
>> wrote:
>>> Posting here instead of learn because I think it uncovers a 
>>> design flaw
>>>
>>> void main(string[] args)
>>> {
>>>     import std.file : dirEntries, SpanMode;
>>>     import std.stdio : writeln;
>>>     foreach(file; dirEntries(args[1], SpanMode.depth))
>>>         writeln(file.name);
>>> }
>>>
>>> Modify this program such that it will print "<file.name> 
>>> access
>>> denied" instead of crashing with an exception whenever it 
>>> hits a
>>> permissions problem. Remember that you might not even have 
>>> permission
>>> to read the directory given in args[1]. Remember that access
>>> permissions can change at any time.
>>>
>>> It can be done, but it is seriously ugly.
>>
>> https://github.com/D-Programming-Language/phobos/pull/931
>>
>> I had to move to some urgent stuff instead of improving the PR 
>> and later
>> I forgot about it. The discussion points out what not to do 
>> when solving
>> this issue. :)
>
> FYI
>
> https://github.com/D-Programming-Language/phobos/pull/2768

I came across the same problem a few years ago. I can't remember 
if a bug was raised. it would be very handy to document the way 
to get around this in the dirEntries pages, especially if it 
involves a little convolution.