Re: [Gnuplot-info] name of current script

[Thomas S. <t.s...@fz...>]

if there is no load file, then GPVAL_LOAD_FILE is undefined,
i.e. not existing, and this can be tested using the 'exists()'
function:

if (exists("GPVAL_LOAD_FILE")) print GPVAL_LOAD_FILE


Robbie Morrison wrote:
> 
> 
> Hello all, hi Thomas
> 
> I can confirm the patch from Thomas Sefzick (see below)
> works for real files but not for 'stdin'.  The patch
> allows the name of the current script to be recovered
> from within that script.  I suggest the patch gets
> developed a little and transferred to the gnuplot mainline.
> Can someone therefore cross-post this message to the
> dev list please?  TIA.
> 
> The patch was tested on Ubuntu 10.04 (64-bit) / Linux
> 2.6.32-32-generic / gcc 4.4.3 / Intel Core i5-520M.
> Here are the build calls:
> 
>   $ ./configure --without-lua    # 11 seconds
>   $ make                         # 35 seconds
> 
> The test script:
> 
>   $ cat gpval-load-file.gp
>   show version
>   print GPVAL_LOAD_FILE
> 
> Some trials:
> 
>   $ src/gnuplot gpval-load-file.gp
> 
>           G N U P L O T
>           Version 4.4 patchlevel 3 (with modifications by robbie)
>           last modified June 2011
>           System: Linux 2.6.32-32-generic
> 
>           Copyright (C) 1986-1993, 1998, 2004, 2007-2010
>           Thomas Williams, Colin Kelley and many others
> 
>           gnuplot home:     http://www.gnuplot.info
>           faq, bugs, etc:   type "help seeking-assistance"
>           immediate help:   type "help"
>           plot window:      hit 'h'
> 
>   gpval-load-file.gp
> 
> However this patch fails if reading from 'stdin:'
> 
>   $ src/gnuplot < gpval-load-file.gp
> 
>         G N U P L O T
>         Version 4.4 patchlevel 3 (with modifications by robbie)
>         last modified June 2011
>         System: Linux 2.6.32-32-generic
> 
>         Copyright (C) 1986-1993, 1998, 2004, 2007-2010
>         Thomas Williams, Colin Kelley and many others
> 
>         gnuplot home:     http://www.gnuplot.info
>         faq, bugs, etc:   type "help seeking-assistance"
>         immediate help:   type "help"
>         plot window:      hit 'h'
> 
>            line 0: undefined variable: GPVAL_LOAD_FILE
> 
> After examining 'misc.c', I should imagine the fix to
> this problem would be straightforward.
> 
> many thanks to Thomas, best wishes to all
> Robbie
> 
> ------------------------------------------------------------
> To:          gnu...@li...
> Subject:     Re: [Gnuplot-info] name of current script
> Message-ID: <311...@ta...>
> From:        Thomas Sefzick <t.s...@fz...>
> Date:        Wed, 9 Mar 2011 09:03:45 -0800 (PST)
> ------------------------------------------------------------
> 
>> the best place to set such a variable would be the
>> 'load_file()' routine in 'misc.c'.
>>
>> two lines need to be added there:
>>
>> --- misc.c.orig 2011-03-08 15:15:32.240304167 +0100
>> +++ misc.c      2011-03-09 18:00:13.300516216 +0100
>> @@ -215,6 +215,8 @@
>>      lf_push(fp, name, NULL); /* save state for errors and recursion */
>>      do_load_arg_substitution = can_do_args;
>>
>> +    fill_gpval_string("GPVAL_LOAD_FILE", name);
>> +
>>      if (fp == (FILE *) NULL) {
>>         os_error(c_token, "Cannot open %s file '%s'",
>>                  can_do_args ? "call" : "load", name);
>> @@ -286,6 +288,8 @@
>>         }
>>      }
>>
>> +    fill_gpval_string("GPVAL_LOAD_FILE", "");
>> +
>>      /* pop state */
>>      (void) lf_pop();           /* also closes file fp */
>>  }
>>
>> Robbie Morrison wrote:
>>>
>>>
>>> Hello all
>>>
>>> It would be rather useful if the current filename was
>>> available from within a gnuplot script.
>>>
>>> This suggestion was raised in 2008 and 2009
>>> respectively:
>>>
>>>
>>> http://groups.google.com/group/comp.graphics.apps.gnuplot/browse_thread/thread/2b34fa67a0365173/8f8c63c891f59aeb?lnk=gst&q=%22current+filename%22#8f8c63c891f59aeb
>>>
>>> http://groups.google.com/group/comp.graphics.apps.gnuplot/browse_thread/thread/781545ccfbaada56/ebffa12161a37fe3?lnk=gst&q=%22get+filename%22#ebffa12161a37fe3
>>>
>>> And, AFAIK, has not been resolved.
>>>
>>> One approach might be:
>>>
>>> assume the file 'myfile.gp' contains the lines:
>>>
>>>     myfile = GPVAL_LOAD_FILE
>>>     print "myfile = ", myfile
>>>
>>> then entering the command:
>>>
>>>     load "myfile.gp"
>>>
>>> would display either of the following -- the first
>>> being a simple echo and the second being the canonical
>>> file path:
>>>
>>>     myfile = myfile.gp
>>>     myfile = /path/to/myfile.gp
>>>
>>> On termination, GPVAL_LOAD_FILE would be unset.
>>>
>>> Another approach (probably too late) would have been
>>> to have the 'call' command assign the filename to $0
>>> in line with most other shell positional variable
>>> conventions.
>>>
>>> If there is a work-around, that would be good to know.
>>>
>>> best wishes
>>> Robbie
> ---
> Robbie Morrison
> PhD student -- policy-oriented energy system simulation
> Technical University of Berlin (TU-Berlin), Germany
> University email (redirected) : mor...@ie...
> Webmail (preferred)           : ro...@ac...
> [from Webmail client]
> 
> 
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