tex2lyx(1)

NAME

tex2lyx - translate well-behaved LaTeX into LyX

SYNOPSIS

The simplest way to use tex2lyx is via the File->Import command in LyX.
That runs tex2lyx on the given file and loads the resulting file into
LyX. You should try that first, and call it from the command line only
if you need to use more complicated options.
tex2lyx [ -df ] [ -userdir userdir ] [ -systemdir systemdir ] [-n]
[ -r renv1[,renv2...]] [ -s sfile1[,sfile2...]]  inputfile  [ -c
textclass ]
tex2lyx [ -df ] [ -userdir userdir ] [ -systemdir systemdir ]
[ -r renv1[,renv2...]] [ -s sfile1[,sfile2...]]  inputfiles -p -c
textclass
tex2lyx -help

OPTIONS

-c Class. By default, when tex2lyx sees a \documentclass{foo} command,: it creates a file of textclass "foo" and reads the LyX layout file for that class (something like
/usr/local/share/lyx/layouts/foo.layout OR
HOME/.lyx/layouts/foo.layout). Use -c to declare a different textclass (and read a different layout file).
-d Debug. By default, tex2lyx gives sparse output and deletes the: temporary files which were created during translation. Using the -d flag will create much more output (both to stdout and stderr) and
leave the temporary files around.
-f Force. tex2lyx will not run if the .lyx file it would generate: already exists. Use the -f option (carefully) to clobber any existing files.
-help: Help. Print out usage information and quit.
-n Noweb. Translate a noweb (aka literate programming) file. This: should be (almost?) equivalent to running "noweb2lyx foo.tex
foo.lyx". This option requires the -c option.
-p Partial file. The input files are LaTeX fragments, with no preamble: matter or \begin{document} commands. This option requires the -c option, since there are no \documentclass commands in the files
tex2lyx is translating. When using this option, you can translate more than one file, as long as all files are the same class. The
LyX file created by tex2lyx can be included in an existing LyX file using the "Include LyX File" command from LyX's Insert menu.
-r Regular environments (see the section on Syntax Files). If you: give more than one environment, separate them with commas (not
spaces). You'll probably need to quote the environment list,
especially if it has asterisk environments (foo*) in it. If you use this command often, considering creating a personal syntax file.
-s Syntax files. Input (one or more quoted, comma-separated) syntax: files to read in addition to the default. (see the section on
Syntax Files for details).
-sysdir: Specify a system directory. Normally, you shouldn't need this. Your LyX system directory is chosen. Cf. the section FILES for details.
-userdir: Specify a user directory. Normally, you shouldn't need this. Your
LyX user directory is chosen. Cf. the section FILES for details.

DESCRIPTION

Introduction

tex2lyx will create a LyX file dir/foo.lyx from the LaTeX file dir/foo.tex.

Suffixes .tex, .ltx and .latex are supported. If inputfile does not exist and does not have one of these suffixes, tex2lyx will try to translate inputfile.tex. (This is similar to the behavior of LaTeX.)

The purpose of tex2lyx is to translate well-behaved LaTeX2e into LyX. If your LaTeX file doesn't compile---or if you do weird things, like
redefining standard LaTeX commands---it may choke. LaTeX209 will often be translated correctly, but it's not guaranteed.

tex2lyx has some bugs and lacks a few features. However, its main goals are:

� Get through a well-behaved LaTeX2e file without crashing

� Translate a lot of that file.

� Localize the parts that can't be translated and copy them in TeX: mode
It achieves these main goals pretty well on most files.
There are many improvements that can and will be made to tex2lyx in the future. However, we wanted to get tex2lyx out there early on, to make it easier for new LyX users to read in their existing LaTeX files.
Usage
Here's a more lengthy description of what you should do to translate a LaTeX document into LyX.
� Run tex2lyx.: tex2lyx will inform you of its progress and give any warnings to stderr, so if you don't want any output at all, try (in csh)
'tex2lyx foo.tex >& /dev/null'. You should NOT redirect standard
output to foo.lyx.
� Run LyX (version 1.4 or later) on the resulting .lyx file.: In theory, most of the file will have been translated, and anything that's untranslatable will be transferred to TeX mode (ERT in LyXspeak). In theory, LyX will be able to read in the file, and to
create printed documents from it, because all that untranslated ERT stuff will be passed directly back to LaTeX, which LyX uses as a
backend. Unfortunately, reality doesn't always reflect theory. If
tex2lyx crashes, or LyX cannot read the generated LyX file, see the BUGS entry elsewhere in this document or the BUGS file.
� Change things that are highlighted in ERT (TeX mode) by hand in: LyX.; As mentioned above, you should be able to print out the LyX file
even without doing this. However, changing a command in TeX mode to the corresponding LyX object will allow you to take advantage of
LyX's WYSIWYM editing.; tex2lyx is not guaranteed to create a LyX file which generates exactly the same output as the LaTeX file, but it should come
close. tex2lyx will generally err on the side of translating less to ensure that dvi or ps files are accurate, even though this leads to more "evil red text" and less WYSIWYM.
� PROOFREAD THE DOCUMENT!!: I'm sure you were planning on doing this anyway, but it's
particularly important after translating a LaTeX document. tex2lyx is, at least now, better at "macro-translating" (translating the
whole document) than "micro-translating" (translating every little detail). For example, you may see extra spaces or deleted spaces.
Space handling has improved, but it's not perfect.
What tex2lyx Can Handle
tex2lyx understands many LaTeX commands. It will translate:
� regular text, including mini-commands like ~, '', \@, \TeX, as well: as accented characters like \'{a}, and the special cases ?` and !`
� title commands like \author, \date, \title, \thanks and the: abstract environment
� heading commands like \section including starred commands: (\section*)
� Environments: quote, quotation, and verse; center, flushright, and: flushleft
� itemize, enumerate, and description environments, and their \item: commands. Also, well-behaved nested lists
� cross-referencing commands: \ref, \pageref, \label, and \cite
� \footnote and \margin
� font-changing commands including \em, \emph, \textit, and: corresponding commands to change family, size, series, and shape
� \input{foo} (or \input{foo.blah}) and \include{foo}. Plain TeX: \input command "\input foo.tex" is also supported.
� tabular environment, and commands that go inside it like \hline,: \cline, and \multicolumn (but see below)
� float environments table and table*, as well as \caption commands: within them
� float environments figure and figure*, as well as graphics: inclusion commands \epsf, \epsffile, \epsfbox, \epsfxsize, \epsfig, \psfig, and \includegraphics. Both the graphics and graphicx forms of \includegraphics are supported. Note, however, that many
figures will not be translatable into LyX. See the section on "What LyX Can't Handle" below.
� thebibliography environment and \bibitem command, as well as: BibTeX's \bibliography and \bibliographystyle commands
� miscellaneous commands: \hfill, \\, \noindent, \ldots...
� documentclass-specific environments (and some commands) which can: be translated to LyX layouts
� arguments to certain untranslatable commands (e.g. \mbox)
Some of this support may not be 100% yet. See below for details
tex2lyx copies math (almost) verbatim from your LaTeX file. Luckily, LyX reads in LaTeX math, so (almost) any math which is supported by LyX should work just fine. A few math commands which are not supported by
LyX will be replaced with their equivalents, e.g., \to is converted to \rightarrow. See the section on Syntax Files for more details.
tex2lyx will also copy any preamble commands (i.e., anything before \begin{document}) verbatim, so fancy stuff you've got in your preamble should be conserved in dvi and printed documents, although it will not of course show up in the LyX window. Check Layout->LaTeX Preamble to
make sure.
What tex2lyx Can't Handle --- But it's OK
� tabular* tables
� spacing commands (\vspace, \pagebreak, \par, ...)
� \centering, \raggedleft, \raggedright
� \verb and verbatim environment. tex2lyx is careful to copy exactly: in this case, including comments and whitespace.
� some unknown (e.g., user-defined) environments and commands
tex2lyx copies unknown commands, along with their arguments, verbatim into the LyX file. Also, if it sees a \begin{foo} where it doesn't
recognize the "foo" environment, it will copy verbatim until it sees
\end{foo} (unless you use the -r option). Hopefully, then, most of these unknown commands won't cause tex2lyx to break; they'll merely require you to do some editing once you've loaded the file up in LyX.
That should be less painful than editing either the .tex or the .lyx
file using a text editor.
What tex2lyx Handles Badly --- aka BUGS
Since tex2lyx is relatively new, it's got a number of problems. As it matures, these bugs will be squished.
� "Exact" copying of unknown environments and commands isn't quite: exact. Specifically, newlines and comments may be lost. This will yield ugly LyX, but in almost all cases the output will be the
same. However, certain parts of the file will be copied perfectly, including whitespace and comments. This includes: the LaTeX
preamble, verbatim environments and \verb commands, and skip
blocks.
� tex2lyx translates only a few options to the \documentclass: command. (Specifically 1[012]pt,
[letter|legal|executive|a4|a5|b5]paper, [one|two]side, landscape,
and [one|two]column.) Other options are placed in the "options"
field in the Layout->Document popup.; More importantly, tex2lyx doesn't translate \usepackage commands, margin commands, \newcommands, or, in fact, anything else from the preamble. It simply copies them into the LaTeX preamble. If you
have margin commands in your preamble, then the LyX file will
generate the right margins. However, these margins will override
any margins you set in the LyX Layout->Paper popup. So you should
remove the options from the preamble (Layout->Latex Preamble) to be safe. The same goes for \inputencoding, \pagestyle, etc.
� tex2lyx doesn't handle unicode yet. So if you have an utf8-encoded: tex file, some characters might not be (well) supported. Also, the output format of tex2lyx is that of LyX 1.4 until unicode support is implemented. Thus, newer features cannot be supported natively.
� The foil class has a couple of bugs. tex2lyx may do weird things: with optional arguments to \foilhead commands. Also, it may handle \begin{dinglist} incorrectly (although the stuff in the environment should translate normally).
Less significant bugs can be found on http://bugzilla.lyx.org.
tex2lyx is hopefully rather robust. As mentioned above, it may not translate your file perfectly, but it shouldn't crash. If it does
crash---and the problem is not one of those mentioned above or on
http://bugzilla.lyx.org---see the section on Bug Reports.
What LyX Can't Handle
LyX itself is missing a couple of features, such that even if tex2lyx translates things perfectly, LyX may still have trouble reading it. If you really need these features, you can export your final document as
LaTeX, and put them back in. See BUGS for more details on these bugs.
� For a number of commands (such as \\), LyX does not support the: optional argument. tex2lyx will automatically discard the optional arguments with a warning to stdout. LyX also ignores the width
argument for the thebibliography environment.
� Centering (or right or left justifying) works on full paragraphs.
� LyX support for tables isn't perfect. For complicated tables, use a: "skip" block, so that they will be copied in TeX mode.
� The LyX math editor can't handle the AMS-LaTeX math environments: align, split, etc. So those environments will be copied in TeX
mode. You can change equation* environments to the exactly
equivalent displaymath, and then they will be translated correctly.
� Lyx does not support clipping or bounding boxes for included: graphics files. Therefore, many graphics inclusion commands will
be untranslatable, and copied in TeX mode. In certain cases, you
might be able to translate the command by hand within LyX---for
example, if you included a bounding box but the bounding box is
already in the .eps file.; LyX only allows figures to have sizes in in,cm, or percentages of
\textwidth or \textheight (or \columnwidth). tex2lyx will translate from other units, like pt or mm, but it cannot translate other
lengths (e.g. if you wanted to scale a figure to size \topmargin
for some reason). tex2lyx will copy figures with untranslatable sizes in TeX mode. Again, you might be able to fix that within LyX.
The Future of tex2lyx
In the future, more commands and environments will be supported by
tex2lyx. Bugs will be eradicated.
See the TODO file for details.

EXAMPLES

tex2lyx -df -r "myenv" foo.tex > foo.debug

The above will create a file foo.lyx from foo.tex, overwriting if
necessary. When it finds a \begin{myenv} ... \end{myenv} block, it
will translate the stuff within the block, but copy the \begin and \end commands in TeX mode. Finally, I'm going to keep the temporary files
around and output lots of debugging information into the file
foo.debug.

tex2lyx -n -c "literate-article" foo.tex

The above will change a noweb document into a LyX literate-article
document. A user would do this if the noweb document had documentclass article.

NOTES

Bug Reports

If tex2lyx is crashing or otherwise acting strangely---in ways other than those described in the section on BUGS or on
http://bugzilla.lyx.org---then please run tex2lyx -d. That will allow you to figure out where in the tex2lyxing process it crashed. That, in turn, will allow you to write a better bug report, which will allow the developers to fix it more quickly and easily.

Bug reports should either be posted to http://bugzilla.lyx.org or sent to the LyX developers' mailing list. Its address is currently lyxdevel@lists.lyx.org, but you can check the LyX home page,
http://www.lyx.org if that bounces. If you are running tex2lyx on a huge file, please do not send all of the output in your bug report.
Just include the last ten or twenty lines of output, along with the
piece of the LaTeX file it crashed on. Or, even better, attach a small but complete file which causes the same problem as your original file.

Implementation Details:

tex2lyx makes several "passes" in order to translate a TeX file. On each pass, it creates one or two files.

Pass 0: Before doing anything, read the syntax file (or files).
Pass 1a: Split preamble (anything before a \begin{document} command) off the rest of the file. It saves the two pieces in separate files. This
is necessary because there may be very strange stuff in a preamble. It also ignores anything after the \end{document}, on the
assumption that it isn't LaTeX.
Pass 1b: Translate the preamble. Currently, that just means translating the \documentclass command and copying the rest exactly into the LyX
preamble.; Once you know what class the document is, read the LyX layout file for that class.
Pass 2: "Clean" the TeX file, generating slightly stricter LaTeX. This
includes:
� Change, e.g., x^2 to the equivalent but clearer x^{2}
� Removing optional arguments that LyX can't handle (e.g.,: from \chapter)
� Changing {\em foo} to \emph{foo}, etc. This is necessary: because LyX always writes out the non-local forms anyway.
This should very rarely make a difference.
Pass 3: Translate LaTeX text, commands, and environments to LyX.
Pass 4: Put the two pieces back together, and do some final tweaking, to
generate the LyX file
If there are any \input or \include commands, tex2lyx will loop back to the beginning and translate those. It assumes that the included files
are the same class as the main file, and that they have no preamble
matter. (If you have an \input command in the preamble of a file, the
command will be copied exactly into the LaTeX preamble portion of the
LyX file, so the included file won't be translated.) So when
translating included files, it skips passes 0 and 1.
If tex2lyx doesn't find a file you wanted to include, it will give a warning, but will continue to translate any files it does find.
Layout Files
tex2lyx reads a LyX layout file to know how to handle LaTeX environments and commands which get translated to LyX layouts. This
file will include all "normal" non-math environments (i.e., including
quote and itemize, but not tabular, minipage, and some other fancy
environments), and commands like \section and \title. If you want to
tex2lyx a class that doesn't have an existing layout file, then you'll have to create a layout file. But you have to do this anyway, in order to LyX the file, since LyX depends on layout files to know how to
display and process its files. Check the LyX documentation for help
with this task (which can be hard or easy, depending on the class you
want to create a layout file for.) If your class is quite similar to a class that has a layout file, then consider using the -c option.
Syntax Files
tex2lyx always reads at least one syntax file, called the default syntax file. tex2lyx will read your personal syntax file if it exists;
otherwise it will read the system-wide file. tex2lyx will read additional syntax files if you specify them with the -s option. (These extra files should have the same format as the default file, but will
tend to be shorter, since they only have to specify extra commands not found in the default file.) A syntax file tells tex2lyx a few things.
First, it describes the syntax of each command, that is, how many
required arguments and how many optional arguments the command takes.
Knowing this makes it easier for tex2lyx to copy (in TeX mode) commands that it doesn't know how to translate. The syntax file simply has a
command, followed by braces or brackets describing its arguments in the correct order. For example, a syntax file entry \bibitem[]{} means that the \bibitem command takes an optional argument followed by a required one, while the entry \bf means that the \bf command takes no arguments at all. When tex2lyx encounters a token that it doesn't know how to translate into LyX, it will copy the token---along with the correct
number of arguments---exactly. If the token is not in the syntax file, then tex2lyx just copies as many arguments as it finds. This means that it may copy too much. But since the user can specify additional
syntax files, that shouldn't happen often.
Some commands that cannot be translated to LyX, like \mbox, have as one of their arguments regular LaTeX text. If the string "translate" is put into an argument of an (untranslatable) command in the syntax file,
then tex2lyx will translate that argument instead of copying it verbatim. So, for example, the default syntax file has
\raisebox{}[][]{translate}. This means that the \raisebox command and
the first argument (and optional arguments if they exist) are copied in TeX mode, but the last argument (which may contain math, complicated
LaTeX, other untranslatable commands, etc.) will be translated into
LyX. You can't use "translate" on optional arguments.
User-defined syntax files are allowed to define new commands and their syntax, or override the number of arguments for a command given in the default syntax file. (E.g., if you're using a style that gives an extra argument to some command...) However, this will only be useful for
commands copied in TeX mode. Commands which are actually translated by tex2lyx (like \item) have their argument syntax hard-coded. The hardcoded commands are identified in the default syntax file.
Second, the syntax file describes any "regular environments". Usually, an entire unknown environment will be copied in TeX mode. If you define a regular environment "foo", though, then only the \begin{foo} and
\end{foo} commands will be copied in TeX mode; the text within the
environment will be treated (i.e., translated) by tex2lyx as regular LaTeX, rather than being copied into TeX mode. Don't try to declare
"tabbing" and "picture" as regular environments, as the text within
those environments will confuse tex2lyx; use this capability for new environments you create that have plain text or math or simple commands in them. You also can't declare unknown math environments (like
equation*) as regular environments, either, since the LyX math editor
won't understand them. The names of regular environments appear,
whitespace-separated, between \begin{tex2lyxre} and \end{tex2lyxre}
statements in the syntax file. (If you have a regular environment which you won't use very often, you can use the -r option rather than writing a syntax file.)

DIAGNOSTICS

tex2lyx should always explain why it crashes, if it crashes. Some diagnostics may be very technical, though, if they come from the guts
of the code. tex2lyx gives much more information while running if you use the -d option, but you shouldn't need that unless something goes wrong.

When it's finished, tex2lyx will tell you if it finished successfully or died due to some error.

WARNINGS

Always keep a copy of your original LaTeX files either under a
different name or in a different directory. There are a couple ways in which using LyX could lead to overwriting the original LaTeX file.

If you import foo.tex to create foo.lyx, then edit foo.lyx and want to re-export it, note that it will overwrite the original foo.tex. (LyX
will ask you if you want to overwrite it.)

If you have the \use_tempdir variable set to false in your lyxrc, then LyX will create its temporary files in your current directory, which
means your LaTeX original may be overwritten (without a warning from
LyX) when you "view dvi" or print the LyX document.

FILES

MY_LYXDIR/layouts/*.layout: User's personal layout files for document classes
MY_LYXDIR/syntax.default: User's personal syntax file
LIBDIR/layouts/*.layout: System-wide layout files for document classes
LIBDIR/lib/syntax.default: System-wide LaTeX syntax file
LIBDIR is the system-wide LyX directory, usually something like /usr/local/share/lyx/. MY_LYXDIR is your personal LyX directory, something like .lyx/ in your home directory.

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