Re: [Jed-users-l] JED: Shift-arrow to mark text

[Manfred Hanke <Manfred.Hanke@xxxxxxxxxxxxxxxxxxxxxxxxxx>]

Hi,

Doug Kramer wrote:
> I could not find documentation for either "evalfile" or "require" on
> jedsoft.org, and am unsure of the difference.
I agree that it is always difficult for new users. You may, however,
discover that the interactive help offered by jed/S-Lang is quite
helpful. I attach below the documentation obtained from
 menu Help => Describe Function => evalfile
 menu Help => Describe Function => require

> When must evalfile be followed with "pop()"?  
> When do we assign it to parens: '() = evalfile("cua")'?
evalfile has a return value. Assigning it to empty parentheses (which
discards that value) is probably identical to leaving it on the stack
and calling the pop function afterwards.

>> I downloaded cuamark.sl, but cannot copy it to /usr/share/jed/lib even
>> with "sudo cp":
>>
>> $ sudo cp jed/cuamark.sl /usr/share/jed/lib/
>> [sudo] password for doog:
>> cp: cannot stat `jed/cuamark.sl': Permission denied
I guess there must be something else wrong. Were you in your home
directory before? Try
$  sudo cp ~doog/jed/cuamark.sl /usr/share/jed/lib

>> How would I load the file from ~/jed/cuamark.sl ?
   require("/home/doog/jed/cuamark.sl");
should in principle do the job.

You can probably also add something like
   set_jed_library_path( "/home/doog/jed," + get_jed_library_path() );
to your ~/.jedrc.

>> I'm quite happy with the design philosophy (and implementation) of JED,
>> and hope to learn better how to customize it.
I'm sure you will. Enjoy!

Cheers,

Manfred


--------------------------------------------------------------------------------

> evalfile: intrinsic function  
> 
>  SYNOPSIS
>   Interpret a file containing S-Lang code
> 
>  USAGE
>   Int_Type evalfile (String_Type file [,String_Type namespace])
> 
>  DESCRIPTION
>   The `evalfile' function loads `file' into the interpreter
>   and executes it.  If called with the optional namespace argument,
>   the file will be loaded into the specified namespace, which will be
>   created if necessary.  If given no namespace argument and the file
>   has already been loaded, then it will be loaded again into an
>   anonymous namespace.  A namespace argument given by the empty string
>   will also cause the file to be loaded into a new anonymous namespace.
> 
>   If no errors were encountered, 1 will be returned; otherwise,
>   a S-Lang exception will be thrown and the function will return zero.
> 
>  EXAMPLE
> 
>     define load_file (file)
>     {
>        try
>        {
>          () = evalfile (file);
>        }
>        catch AnyError;
>     }
> 
>  NOTES
>   For historical reasons, the return value of this function is not
>   really useful.
> 
>   The file is searched along an application-defined load-path.  The
>   `get_slang_load_path' and `set_slang_load_path' functions
>   may be used to set and query the path.
> 
>  SEE ALSO
>   eval, autoload, set_slang_load_path, get_slang_load_path

--------------------------------------------------------------------------------

> require: library function
> 
>  SYNOPSIS
>   Make sure a feature is present, and load it if not
> 
>  USAGE
>   require (feature [,namespace [,file]])
>    String_Type feature, namespace, file;
> 
>  DESCRIPTION
>   The `require' function ensures that a specified "feature" is present.
>   If the feature is not present, the `require' function will attempt to
>   load the feature from a file.  If the `namespace' argument is present
>   and non-NULL, the specified namespace will be used.  The default is to use
>   the current non-anonymous namespace. If called with three arguments, the
>   feature will be loaded from the file specified by the third argument
>   if it does not already exist in the namespace.  Otherwise, the feature
>   will be loaded from a file given by the name of the feature, with
>   ".sl" appended.
> 
>   If after loading the file, if the feature is not present,
>   a warning message will be issued.
> 
>  EXAMPLE
>     require ("histogram");
>     require ("histogram", "foo");
>     require ("histogram", "foo", "/home/bob/hist.sl");
>     require ("histogram", ,"/home/bob/hist.sl");
> 
>  NOTES
>   "feature" is an abstract quantity that is undefined here.
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