How to use retro over findSplitBefore result?

[MrSmith]

On Wednesday, 4 December 2013 at 18:01:52 UTC, Jesse Phillips 
wrote:
> On Wednesday, 4 December 2013 at 17:43:22 UTC, MrSmith wrote:
>> I am trying to compile following code
>>
>> import std.algorithm : findSplitBefore;
>> import std.range : retro;
>> import std.array : array;
>>
>> // returns file path where name has suffix and prefix
>> string withSuffixPrefix(string filePath, string prefix, string 
>> suffix)
>> {
>>    auto splitted = filePath.retro.findSplitBefore("/");
>>
>>    return cast(string)splitted[1].retro.array
>> 		~ prefix
>> 		~ cast(string)splitted[0].retro.array //Fails!
>> 		~ suffix;
>> }
>
> The casting you've placed in there scares me. The returned 
> range is going to be of dchar, assuming you're interested in 
> UTF support, you'll want a conversion not a cast, I recommend 
> std.conv.to!string. But even this is too much so I've commented 
> that out and replaced it with a somewhat lazy approach:
>
> import std.algorithm : findSplitBefore;
> import std.range : retro, chain;
> import std.array : array;
> import std.conv : to;
>
> // returns file path where name has suffix and prefix
> string withSuffixPrefix(string filePath, string prefix, string
> suffix)
> {
>     auto splitted = filePath.retro.findSplitBefore("/");
>
>     //return splitted[1].array.retro.to!string
> 	//	~ prefix
> 	//	~ splitted[0].array.retro.to!string
> 	//	~ suffix;
>     return chain(splitted[1].array.retro,
> 		prefix,
> 		splitted[0].array.retro,
> 		suffix).array;
> }
>
> void main() {
> 	assert(withSuffixPrefix("/some/random/path/to/file", "pref-",
> 		  ".fl") == "/some/random/path/to/pref-file.fl");
> }

Thank you for help, it's working!