agda2lagda: Convert program to literate program (Agda/Haskell)

Generate a literate Agda/Haskell script from an Agda/Haskell script. Produces LaTeX or Markdown literate scripts.

Conversion into LaTeX (default):

• Single line comments are turned into ordinary LaTeX.

  • Paragraphs followed by a line of equal signs are turned into \headings.
  • Paragraphs followed by a line of dashes are turned into \subheadings.
  • Consecutive paragraphs starting * are turned into an itemize environment.
  • At the end of the file, extra block comment terminators are removed.

• Comment blocks, if started on the 0th column, count as commenting out. These will be turned into TeX comments. Nested comments are not recognized.

• The rest is interpreted as code and wrapped in a code environment.

Conversion into Markdown (option --markdown):

• Single line comments are turned into ordinary text.

  • At the end of the file, extra block comment terminators are removed.

• Comment blocks, if started on the 0th column, count as commenting out. These will be turned into HTML comments. Nested comments are not recognized.

• The rest is interpreted as code and wrapped in a code environment (triple backticks).

Examples (rendered):

• http://www.cse.chalmers.se/~abela/#MultiSortedAlgebra
• http://www.cse.chalmers.se/~abela/#cr-sk

Example: agda2lagda Foo.agda

Input: Foo.agda

-- Sample non-literate Agda program
-- ================================
--
-- A remark to test bulleted lists:
--
-- * This file serves as example for agda2lagda.
--
-- * The content may be non-sensical.
--
-- Indeed!

module Foo where

-- Some data type.

data D : Set where
  c : D

-- A function.
foo : D → D
foo c = c   -- basically, the identity

{- This part is commented out.
{-
bar : D → Set
bar x = D
-- -}
-- -}

-- A subheading
---------------

module Submodule where

  postulate
    zeta : D

-- That's it.
-- Bye.

Output: Foo.lagda.tex

%% This file was automatically generated by agda2lagda 0.2021.6.1.

\heading{Sample non-literate Agda program}

A remark to test bulleted lists:

\begin{itemize}

\item
This file serves as example for agda2lagda.

\item
The content may be non-sensical.

\end{itemize}

Indeed!

\begin{code}
module Foo where
\end{code}

Some data type.

\begin{code}
data D : Set where
  c : D
\end{code}

A function.

\begin{code}
foo : D → D
foo c = c   -- basically, the identity
\end{code}

%% This part is commented out.
%% {-
%% bar : D → Set
%% bar x = D
%% -- -}
%% --

\subheading{A subheading}

\begin{code}
module Submodule where

  postulate
    zeta : D
\end{code}

That's it.
Bye.

Installation

These are standard installation instructions.

Last update of installation instructions: 2023-01-11.

From stackage.org

Requires stack.

stack update
stack install agda2lagda

From hackage.haskell.org

Requires GHC >= 8.0 and the Haskell Cabal.

cabal update
cabal install agda2lagda

From the repository

git clone https://github.com/andreasabel/agda2lagda.git
cd agda2lagda
cabal install

Alternatively to the last line, you can use stack. E.g. if you have GHC 8.10.7 installed, you can use this compiler as follows:

stack install --system-ghc --stack-yaml stack-8.10.7.yaml

Alternatively, stack can install the compiler for you:

stack install --stack-yaml stack-xx.yy.zz.yaml

The xx.yy.zz is a placeholder for the GHC version, choose one (for which there is a .yaml file).

At the time of writing, installation with these GHC versions has been tested: 8.0.2, 8.2.2, 8.4.4, 8.6.5, 8.8.4, 8.10.7, 9.0.2, 9.2.5, 9.4.4.