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Ticket #5897 (new Feature Requests)

Opened 4 years ago

Last modified 4 months ago

Make path relative function.

Reported by: jmckesson@… Owned by: bemandawes
Milestone: To Be Determined Component: filesystem
Version: Boost 1.47.0 Severity: Problem
Keywords: Cc:

Description

It is often useful to take a path that is absolute and make it relative to some other path. For example, if you're copying from directory A to directory B using a recursive_directory_iterator, it is often the case that you will do the following:

for_each(bfs::recursive_directory_iterator(directoryA), bfs::recursive_directory_iterator(), [=](const bfs::directory_entry &entry)
{
  if(bfs::is_file(entry.status()))
  {
    bfs::path dstPath = directoryB / make_relative(directoryA, entry.path());
    bfs::copy_file(entry.path(), dstPath);
  }
});

The make_relative function would iterate through the path components of the two arguments, removing entries until it found different ones. Then, it would add ".." to the beginning of the second path argument, until it ran out of directories in the first path. What you are left with is the second path relative to the first one.

Obviously, this would not work if both paths are absolute. But this is such a common operation that there has to be some way to make it work.

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Change History

comment:1 Changed 4 years ago by anonymous

Great idea! I was looking for that exact function just today.

comment:2 Changed 4 years ago by anonymous

I've added an example for 1.46.1 ( probably works for trunk as well, haven't tried ). For details take a look at  https://svn.boost.org/trac/boost/ticket/6249 .

comment:3 Changed 2 years ago by anonymous

Please consider this feature, it is required rather often -  http://stackoverflow.com/questions/10167382/boostfilesystem-get-relative-path

comment:4 Changed 2 years ago by anonymous

This would be really helpful, I'd consider it one of the basic functions you want to do with paths.

comment:5 Changed 10 months ago by slowriot <riot@…>

+1 for this.

comment:6 Changed 9 months ago by mojes@…

+1 for this

comment:7 Changed 9 months ago by fhntv24fhntv24@…

+1 for this.

comment:8 Changed 6 months ago by londinop@…

+1 for this.

comment:9 Changed 5 months ago by anonymous

+1

comment:10 Changed 5 months ago by anonymous

+1

comment:11 Changed 4 months ago by jarruda

Could a contributor at least comment on this? This at least seems like a "must-have" feature for any utility file system API. 4 years is a pretty long time for a simple feature request to not be acknowledged.

comment:12 Changed 4 months ago by anonymous

Have you not seen the other 2692 active tickets they're equally busy ignoring? ;)

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