Re: Converting filenames

Re: Converting filenames

[Pascal J. Bourguignon]

Nordlöw <per.nordlow@gmail.com> writes:

> Is there an opposite function of expand-file-name() that converts "/
> home/per/" to "~/" if I am user per?

Yes.  All the functions already exist.  
You just have to discover their name.  

This function name discovering activity is called "programming".


-- 
__Pascal Bourguignon__                     http://www.informatimago.com/

Re: Converting filenames

[B. T. Raven]

Nordlöw wrote:
> Is there an opposite function of expand-file-name() that converts "/
> home/per/" to "~/" if I am user per?
> 
> Thanks in advance,
> Nordlöw

I don't think that a general inverse function would be useful since "~/"
is probably not a symlink or hard link but just string somehow hard
coded to expand to the fully qualified home path. What would the
putative abbrev-file-name do with dir/subdir/pic.jpg? The only sensible
thing is just to return its argument.

Something like this:

(if (equal (getenv "home") "/home/per")    (print "~/"))

illustrates what should happen if the Emacs process belongs to per.

Ed

Re: Converting filenames

[B. T. Raven]

B. T. Raven wrote:
> Nordlöw wrote:
>> Is there an opposite function of expand-file-name() that converts "/
>> home/per/" to "~/" if I am user per?
>>
>> Thanks in advance,
>> Nordlöw
> 
> I don't think that a general inverse function would be useful since "~/"
> is probably not a symlink or hard link but just string somehow hard
> coded to expand to the fully qualified home path. What would the
> putative abbrev-file-name do with dir/subdir/pic.jpg? The only sensible
> thing is just to return its argument.
> 
> Something like this:
> 
> (if (equal (getenv "home") "/home/per")    (print "~/"))
> 
> illustrates what should happen if the Emacs process belongs to per.
> 
> Ed

Oops, abbreviate-file-name actually exists but returns only "~". You
could wrap it in something that concats the "/"

Ed

RE: Converting filenames

[Drew Adams]

> Is there an opposite function of expand-file-name() that converts "/
> home/per/" to "~/" if I am user per?

`abbreviate-file-name'.
Except if your home dir is a root dir.

Re: Converting filenames

[Kevin Rodgers]

On 6/30/10 10:31 PM, B. T. Raven wrote:
> Oops, abbreviate-file-name actually exists but returns only "~". You
> could wrap it in something that concats the "/"

file-name-as-directory

-- 
Kevin Rodgers
Denver, Colorado, USA