Re: [Gimp-web] Proposed gimp tutorial

[Pat David <patdavid gmail com>]

Could someone with a better grasp of the material chime in to help iron
this out so that we can possibly include it as either a tutorial or wiki
material?  I have to confess to not being familiar enough with the material
to be able to add anything meaningful beyond helping to translate to the
proper format for inclusion on wgo. :)


On Fri, Feb 21, 2014 at 6:38 PM, Stephen Kiel <snick kiel gmail com> wrote:

>  Pat,
>
> I did look into the DIR-SEPARATOR (DIR_SEPARATOR on python?) constant. It
> did not appear to be documented anywhere in the gimp docs that I could find
> with a search engine.  From an old scheme script I found posted I was able
> to find the following:
>
> The DIR-SEPARATOR constant appears to be just a "/" on platforms where the
> OS is Linux and "\" on platforms where the OS is Windows.  The following is
> pasted from a Script-Fu Console and a Python-Fu Console (Linux).
>
> **** Script-Fu Console*
>
> Welcome to TinyScheme
> Copyright (c) Dimitrios Souflis
> Script-Fu Console - Interactive Scheme Development
>
> > (string-append "Yaba" DIR-SEPARATOR "Daba" DIR-SEPARATOR "Doo")
> "Yaba/Daba/Doo"
>
>
> **** PYTHON CONSOLE*
>
> GIMP 2.8.10 Python Console
> Python 2.7.5 (default, Feb 11 2014, 10:29:30)
> [GCC 4.8.2 20131212 (Red Hat 4.8.2-7)]
> > > > import os
> > > > print os.sep
> /
> > > > from gimpfu import *
> > > > print DIR_SEPARATOR
> Traceback (most recent call last):
>   File "<input>", line 1, in <module>
> NameError: name 'DIR_SEPARATOR' is not defined
> > > > print DIR-SEPARATOR
> Traceback (most recent call last):
>   File "<input>", line 1, in <module>
> NameError: name 'DIR' is not defined
> > > > if DIR_SEPARATOR == "/":
> ...     print "YES"
> ...
> Traceback (most recent call last):
>   File "<input>", line 1, in <module>
> NameError: name 'DIR_SEPARATOR' is not defined
> > > >
>
> In python, os.sep does the same job that we would expect from
> what we see in the scheme example except it has the following
> advantages:
>
>    1. It is documented
>    2. It has a wide user base, so it should be robust
>    3. It works in any python shell, so you can debug programs using wide
>    range of tools.
>    4. It works.
>
> It seems like os.sep would be a much better design choice **IF** we
> actually needed to determine a platform portable directory separator.  As
> far as I can tell, we don't.
>
> In the code I use python functions that take care of the separator.
> e.g.
> srcFile = os.path.join(srcPath, srcFile)
> Python sticks in the right separator for the host OS.
>
> From my point of view, it seems like using the DIR_SEPARATOR and manually
> concatenating strings would make the code clumsy. I did not see anywhere
> where knowing what the separator character was would be
> an advantage.
>
> I wanted to keep the focus of the tutorial on Automation and not get
> sidetracked too much on design and architecture.  It is worth while to note
> that if you can design a block of code (like autoBase.py) that does not use
> the gimpfu library, you can run it on any python shell and use any
> debugging tools at your disposal.  This is a real advantage over debugging
> in Gimp.  So I view using a gimp constant instead of a python library
> function (os.sep) as kind of a mistake.
>
> Please let me know if I missed something.
>
>
> Stephen
>
> On 2/20/2014 1:03 PM, Pat David wrote:
>
>  Stephen,
>
>  Just a couple of notes.  There are some concerns about the introduction
> of the term "macro" in the tutorial and the sense with which it's used.
>
>  Also, saul has asked me to relay to you: "have him look into the
> DIR-SEPARATOR constant. Using it would obviate about half of his code."
>
>  If you can take a look at DIR-SEPARATOR to see if perhaps it can help
> streamline things a bit, that would be great.  I'm also hoping others might
> be able to chime in with other suggestions as well.
>
>  There is a consideration of moving this to the wiki as opposed to wgo as
> well.
>
>
>
> On Thu, Feb 20, 2014 at 1:37 PM, Pat David <patdavid gmail com> wrote:
>
> >  Stephen,
> >
> >  I've converted the tutorial to HTML to fit the website.  I've pushed it
> > up along with the assets, and am now just waiting on someone to poke wgo
> > for it to show up.  Keep an eye on the tutorials page.
> >
> >
> > On Thu, Feb 20, 2014 at 1:29 PM, Stephen Kiel <snick kiel gmail com>wrote:
> >
> > > Pat,
> > > Thanks.  Let me know if there are any issues.
> > >  Stephen
> > >  On Feb 20, 2014 7:27 AM, "Pat David" <patdavid gmail com> wrote:
> > >
> > > >  Hi Stephen!
> > > >
> > > >  You can just leave it as an ODT file.  I'll make the stylistic
> > > > changes required to fit the website HTML.
> > > >
> > > >  Give me a little time and I'll make the conversion and get it up to
> > > > test.
> > > >
> > > >  Thanks for the contribution!
> > > >
> > > >  --
> > > > pat david
> > > > http://blog.patdavid.net
> >
> >
> >  --
> > pat david
> > http://blog.patdavid.net
>
>
>
>  --
> pat david
> http://blog.patdavid.net
>
>
> --
> Stephen Kiel
> 26602 Strafford
> Mission Viejo, CA 92692
> Mobile/SMS (949) 702-1993
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