A note from
http://stackoverflow.com/questions/2552416/how-can-i-find-the-users-home-dir-in-a-cross-platform-manner-using-c
Important remark: *many people are assuming that HOME environment variable
is always available on Unix but this is not true*, one good example would
be OS X.
On OS X when you run an application from GUI (not console) this will not
have this variable set so you need to use the getpwuid().
On Wed, Jul 2, 2014 at 11:27 AM, Elias Mårtenson <loke...@gmail.com> wrote:
> Arguably, I can't think of a single situation where PATH isn't set while
> getpwuid would work. I could be wrong though.
>
> Regards,
> Elias
>
>
> On 3 July 2014 00:13, Blake McBride <blake1...@gmail.com> wrote:
>
>> What was recommended is to use PATH variable (as you suggest) and then
>> fall back to the code I gave.
>>
>>
>> On Wed, Jul 2, 2014 at 11:00 AM, Elias Mårtenson <loke...@gmail.com>
>> wrote:
>>
>>> Neat, although I believe directly looking at the PATH variable is more
>>> portable. It works on all Unices as well as Windows.
>>>
>>> Regards,
>>> Elias
>>>
>>>
>>> On 2 July 2014 23:54, Blake McBride <blake1...@gmail.com> wrote:
>>>
>>>> I found this for Unix/Linux systems:
>>>>
>>>>
>>>> #include <unistd.h>#include <sys/types.h>#include <pwd.h>
>>>> struct passwd *pw = getpwuid(getuid());
>>>> const char *homedir = pw->pw_dir;
>>>>
>>>>
>>>>
>>>>
>>>> On Wed, Jul 2, 2014 at 10:44 AM, Elias Mårtenson <loke...@gmail.com>
>>>> wrote:
>>>>
>>>>> I have to agree with Blake here. Ideally there should be a call to
>>>>> getenv("HOME") and if that returns non-NULL, then use the .apl_history
>>>>> in $HOME/.apl/apl_history or something like that.
>>>>>
>>>>> If it returns NULL, well, then fall back to current directory I
>>>>> suppose.
>>>>>
>>>>> I could make the Emacs mode use the same file, so that th ehistory is
>>>>> shared between emacs and non-emacs sessions.
>>>>>
>>>>> Regards,
>>>>> Elias
>>>>>
>>>>>
>>>>> On 2 July 2014 23:41, Blake McBride <blake1...@gmail.com> wrote:
>>>>>
>>>>>> Dear Juergen,
>>>>>>
>>>>>> If you have trouble reliably finding the home directory, how do you
>>>>>> find the preferences file?
>>>>>>
>>>>>> I would say to find the .apl.history file in the same way and place
>>>>>> you find the .gnu-apl directory. That would be consistent.
>>>>>>
>>>>>> The problem I am having is that since I use GNU APL from the command
>>>>>> line, every time I start GNU APL up, I first have to check the directory
>>>>>> I
>>>>>> am in, otherwise I get a bunch of random .apl.history files all over the
>>>>>> place.
>>>>>>
>>>>>> I understand that I can fix the problem in my preferences file, but
>>>>>> now I have to remember to potentially edit that file for each user or
>>>>>> machine I am on to account for the different home directory. I don't
>>>>>> have
>>>>>> to do that with my .gnu-emacs file.
>>>>>>
>>>>>> Either way is fine. Just sharing my opinion.
>>>>>>
>>>>>> Thanks!
>>>>>>
>>>>>> Blake
>>>>>>
>>>>>>
>>>>>>
>>>>>> On Wed, Jul 2, 2014 at 9:52 AM, Juergen Sauermann <
>>>>>> juergen.sauerm...@t-online.de> wrote:
>>>>>>
>>>>>>> Hi Blake,
>>>>>>>
>>>>>>> yes. The problem with that is that it requires the presence of a
>>>>>>> home directory.
>>>>>>>
>>>>>>> There are use cases like scripting where the interpreter cannot
>>>>>>> figure where the
>>>>>>> home directory is located and my strategy is to depend on as few
>>>>>>> environment
>>>>>>> variables (like $HOME or $PWD) as possible.
>>>>>>>
>>>>>>> Note that ~ is a shell convention and not a file system property so
>>>>>>> that ~/.apl.history
>>>>>>> or $HOME/.apl.history may fail under certain circumstances.
>>>>>>>
>>>>>>> /// Jürgen
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> On 07/02/2014 04:25 PM, Blake McBride wrote:
>>>>>>>
>>>>>>> Dear Juergen,
>>>>>>>
>>>>>>> Thanks. I can do that, but every other Linux program I have ever
>>>>>>> used, although it may allow me to specify a config file location as you
>>>>>>> do,
>>>>>>> the default is always in the home directory.
>>>>>>>
>>>>>>> Thanks.
>>>>>>>
>>>>>>> Blake
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> On Wed, Jul 2, 2014 at 6:24 AM, Juergen Sauermann <
>>>>>>> juergen.sauerm...@t-online.de> wrote:
>>>>>>>
>>>>>>>> Hi Blake,
>>>>>>>>
>>>>>>>> you can set the path in the preferences files:
>>>>>>>>
>>>>>>>> READLINE_HISTORY_PATH = /home/...
>>>>>>>>
>>>>>>>> /// Jürgen
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> On 07/01/2014 11:14 PM, Blake McBride wrote:
>>>>>>>>
>>>>>>>>> GNU APL creates a .apl.history in whatever directory APL is
>>>>>>>>> started up in. This is unlike all other system I've seen, and a
>>>>>>>>> problem
>>>>>>>>> when you don't start APL in the same directory each time. I think
>>>>>>>>> rather
>>>>>>>>> than .apl.history, the system should use ~/.apl.history
>>>>>>>>> In other words keep in the home directory.
>>>>>>>>>
>>>>>>>>> Thanks.
>>>>>>>>>
>>>>>>>>> Blake
>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>
>
