From mboxrd@z Thu Jan  1 00:00:00 1970
From: tsd@tsdye.com (Thomas S. Dye)
Subject: Re: Losing tabs when tangling or editing
Date: Mon, 28 May 2012 02:30:58 -1000
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	(Michael Hannon's message of "Wed, 23 May 2012 14:18:39 -0700 (PDT)")
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To: Michael Hannon <jm_hannon@yahoo.com>
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Michael Hannon <jm_hannon@yahoo.com> writes:

> Greetings.=C2=A0 I was trying to set up a little demo in which I included=
 a
> Makefile inside a "sh" source-code block in an Org-mode file, then tangle=
d the
> file and ran "make" on the tangled file (either in the actual shell or in
> another sh block in Org).
>
> It appears that Org is removing tabs when it tangles the file, and the la=
ck of
> tabs causes "make" to complain.
>
> I've appended a toy example which exhibits the problem.=C2=A0 BTW, if I e=
dit the
> source block via C-c ' I also lose the tabs, i.e., even before tangling.
>
> Any thoughts about this?
>
> Thanks,
>
> -- Mike
Hi Mike,

I stumbled across this, too, in a somewhat different context.  My
"solution" was to hard code the newlines and tabs with \n\t using an
emacs-lisp source block and (format), then evaluate to a file, rather
than tangle.  I don't think it's a pretty solution, but it does work.

hth,
Tom


#+name: configure-makefile
#+header: :file Makefile
#+header: :var emacs=3D"/Applications/Emacs-23-4.app/Contents/MacOS/Emacs"
#+header: :var init-file=3D"init-new.el"
#+header: :var exporter=3D"new"
#+header: :eval noexport
#+BEGIN_SRC emacs-lisp
    (let ((f (file-name-sans-extension (file-name-nondirectory
                                        (buffer-file-name))))
          (g (if (string=3D exporter "old") "org-export-as-latex" "org-e-la=
tex-export-to-latex")))
       (format "CC=3Dgcc
    EMACS=3D%s
    BATCH_EMACS=3D$(EMACS) --batch -Q -l %s %s
=20=20=20=20
    all: %s.pdf
=20=20=20=20
    %s.tex: %s.org\n\t$(BATCH_EMACS) -f %s
=20=20=20=20
    %s.pdf: %s.tex\n\trm -f %s.aux\n\tif pdflatex %s.tex </dev/null; then \=
\\n\t\ttrue; \\\n\telse \\\n\t\tstat=3D$$?; touch %s.pdf; exit $$stat; \\\n=
\tfi\n\tbibtex %s\n\twhile grep \"Rerun to get\" %s.log; do \\\n\t\tif pdfl=
atex %s.tex </dev/null; then \\\n\t\t\ttrue; \\\n\t\telse \\\n\t\t\tstat=3D=
$$?; touch %s.pdf; exit $$stat; \\\n\t\tfi; \\\n\tdone
=20=20=20=20
    %s.ps: %s.pdf\n\tpdf2ps %s.pdf
=20=20=20=20
    clean:\n\trm -f *.aux *.log  *.dvi *.blg *.bbl *.toc *.tex *~ *.out %s.=
pdf *.xml *.lot *.lof
    " emacs init-file (file-name-nondirectory (buffer-file-name)) f f f g f=
 f f f f f f f f f f f f))
#+END_SRC


>
>
> $ cat Makefile.original=20
> hw:=C2=A0=C2=A0=C2=A0 hw.cpp
> =C2=A0=C2=A0=C2=A0 g++ -o hw hw.cpp
>
> $ grep -P "\t" Makefile.original=20
> hw:=C2=A0=C2=A0=C2=A0 hw.cpp
> =C2=A0=C2=A0=C2=A0 g++ -o hw hw.cpp
>
> $ make -f Makefile.original=20
> g++ -o hw hw.cpp
>
> $ ./hw
> Hello, world!
>
> $ \rm hw
>
> $ cat hw.org
> * test preservation of tabs when tangling
>
> #+BEGIN_SRC sh :tangle Makefile.tangled
>
> hw:=C2=A0=C2=A0=C2=A0 hw.cpp
> =C2=A0=C2=A0=C2=A0 g++ -o hw hw.cpp
>
> #+END_SRC
>
> $ make -f Makefile.tangled
> Makefile.tangled:3: *** missing separator (did you mean TAB instead of 8
> spaces?).=C2=A0 Stop.
>
>

--=20
Thomas S. Dye
http://www.tsdye.com