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.

Specification

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) is similar, but nothing needs to be done for headings and itemize environments:

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

Given input Foo.agda:

Invocation agda2lagda Foo.agda produces output Foo.lagda.tex.
Invocation agda2lagda --markdown Foo.agda produces output Foo.lagda.md.

LaTeX examples (rendered):

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

Example Makefile to turn .agda file into highlighted HTML via Markdown (since v0.2023.1.12):

FILE=Foo
TITLE=The Title

default : md/html/$(FILE).html

# Step 1: agda2lagda: Produce Markdown literate script.

md/%.lagda.md : %.agda
	agda2lagda -f --markdown -o md/ $<

# Step 2: agda: Highlight and format code blocks as HTML.
# Also produces Agda.css.

md/html/%.md : md/%.lagda.md
	cd md ; agda --html --html-highlight=auto ../$<

# Step 3: pandoc: Produce HTML.  Improvise header to make HTML self-contained.

md/html/%.html : md/html/%.md
	echo '<!DOCTYPE HTML><html><head><meta charset="utf-8"><title>$(TITLE)</title><link rel="stylesheet" href="Agda.css"></head>' > $@
	pandoc -f markdown -t html $< >> $@

Installation from binary

Binaries for Linux, macOS and Windows are available from GitHub releases. Just download the executable for your platform there and put it in a directory that is in the system PATH.

For example, under Linux (similar under macOS):

VERSION="0.2023.3.25"
SRC="https://github.com/andreasabel/agda2lagda/releases/download/v${VERSION}/agda2lagda-${VERSION}-linux.binary"
TGT="/usr/local/bin/agda2lagda"
wget ${SRC} -O ${TGT}
chmod +x ${TGT}

For macOS, there is also a installer package, e.g.:

VERSION="0.2023.3.25"
SRC="https://github.com/andreasabel/agda2lagda/releases/download/v${VERSION}/agda2lagda-${VERSION}-mac.pkg"
TGT="/tmp/agda2lagda.pkg"
wget ${SRC} -O ${TGT}
open ${TGT}

Verify the installation with these commands (Linux/macOS):

$ which agda2lagda
/usr/local/bin/agda2lagda
$ agda2lagda --version
agda2lagda version 0.2023.3.25

Installation from source

These are standard installation instructions.

Last update of installation instructions: 2023-03-25.

From stackage.org

Requires stack.

stack update
stack install agda2lagda --resolver nightly

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, 9.2.7, 9.4.4.