Scroll to navigation

LHS2TEX(1) User Commands LHS2TEX(1)


lhs2TeX - a literate Haskell to (La)TeX code translator


lhs2TeX [options] file


This tool takes as its input a literate Haskell source file (Bird-style or LaTeX-style or even a combination thereof), and produces output, which, depending on the STYLE selected, can be either a LaTeX document or a stripped version of the code. The output is produced on stdout. Several directives are interpreted by lhs2TeX itself and can be used to customize the output further.


There are two sorts of options for lhs2TeX. The first selects a STYLE which governs the overal mode of operation for lhs2TeX. Only one style may be selected:

The poly style is an improvement of the older math style. It produces a LaTeX document, with the code blocks formatted using a proportional font. The output is highly customizable using formatting directives. Furthermore, the resulting code respects some of the alignments made in the source file.

The math style is as poly style, but has less alignment capabilities. Tokens appearing in the source file at a special column are all aligned in the output. Furthermore, indentation is respected.

In the new code style, everything but code blocks is stripped from the file. In addition, certain syntactic transformations can be performed on the code using formatting directives. For example, if the source code is annotated in certain positions to produce even nicer results in poly style, one can use newcode style to remove these annotations.

In code style, all comments and specification code is stripped from the file, so that only the code remains. Use this if you want to produce a smaller version of your source file.

Typewriter style prints code almost verbatim, using a monospaced font, but formatting certain symbols (lambda abstraction, arrows ...) using an extended character set. This style is default if no style is explicitly selected, but this behaviour should not be relied upon. The default style may be changed in future versions.

Verbatim style prints code as-is, using a monospaced font. No formatting whatsoever is applied to the code. However, lhs2TeX does not make use of a LaTeX verbatim environment, but rather escapes special TeX constructs in the translation. This implies that it is easier to pass the resulting TeX code to macros or use it inside certain environments than it would be with a native verbatim-environment.

The following options are considered are also considered as styles, but return only information about the program:

Returns a short usage message listing all the available options.

Returns version information.

Displays the complete GNU General Public License.

Displays the parts of the GPL than concerns warranty.

The remaining options modify the behaviour of the program.

Takes a (colon-separated) list path of paths that are used as search path for files to be included. If the list starts with a colon, then the list is appended to the current search path. If the list ends with a colon, then the list is prepended to the current search path. If there is neither a colon at the beginning nor at the end of the list, then the list replaces the current search path.

Environment variables can be used in the list of paths, if enclosed in curly braces, i.e., {VAR} expands to the current value of the environment variable VAR. If a path ends with a double slash //, then all subdirectories of that path are included in the search path. Note that this can significantly slow down lhs2TeX when looking for files.

The built-in default search path of lhs2TeX is


Includes file before anything else. This option has the same effect as an

%include file

directive at the beginning of the source file.

Assumes equation while processing the source file. This option has the same effect as a

%let equation

directive at the beginning of the source file.

Sets flag to True at the beginning of the source file. This option has the same effect as a

%let flag=True

at the beginning of the source file.

Sets flag to False at the beginning of the source file. This option has the same effect as a

%let flag=False

at the beginning of the source file.




Andres Loeh <polytable at andres-loeh dot de> wrote poly and newcode styles and is the current maintainer of the package.

Ralf Hinze <ralf at informatik dot uni-bonn dot de> wrote the original lhs2TeX.

SEE ALSO, the lhs2TeX development repository and issue tracker, the lhs2TeX Hackage page
Guide2.pdf, the manual

April 2015 lhs2TeX