Re: [Gimp-web] Proposed gimp tutorial

[Quentin Pradet <quentin pradet gmail com>]

Hello,

Stephen is right, using Python's os.sep is much better than using
DIR-SEPARATOR.


On Mon, Feb 24, 2014 at 9:36 PM, Pat David <patdavid gmail com> wrote:

> 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
> > Home (949) 367-2915  snick kiel gmail comhttp://
> stephenkiel.blogspot.com/
> >
>
>
> --
> pat david
> http://blog.patdavid.net
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