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# agda2lagda: Convert Agda/Haskell text to literate Agda/Haskell text

Generate a LaTeX literate Agda/Haskell script from an Agda/Haskell script.

- Single line comments are turned into ordinary LaTeX.
  * Paragraphs followed by a line of dashes are turned into `\heading`s.
  * 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.

Example: `agda2lagda Foo.agda`

Input: `Foo.agda`
```agda
-- Foo heading
--------------
--
-- Sample non-literate Agda program.
--
-- This file serves as example for agda2lagda.
-- The content may be non-sensical.

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
-- -}
-- -}

-- Another heading
------------------

module Submodule where

  postulate
    zeta : D

-- That's it.
-- Bye.
-- -} -} -} -}
```

Output: `Foo.lagda.tex`
```latex
\heading{Foo heading}

Sample non-literate Agda program.

This file serves as example for agda2lagda.
The content may be non-sensical.

\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
%% -- -}
%% --

\heading{Another heading}

\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: 2020-11-01.

### From stackage.org

Requires [stack](https://docs.haskellstack.org/en/stable/install_and_upgrade/).
```
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 8.10.2 installed, you can use this compiler as follows:
```
stack install --system-ghc --stack-yaml stack-8.10.2.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, 8.10.2.