Pandoc filter to include code from source files as code blocks.

The filter is largely inspired by pandoc-include-code written by Oskar WICKSTRÖM.

This repository exists thanks to the work of Albert KREWINKEL among other things in pandoc/lua-filters.

If you are a Quarto user, please use the official extension from the Quarto team: https://github.com/quarto-ext/include-code-files.

Install the extension whether by simply downloading the include-code-files.lua file somewhere on your computer or by cloning this repository:

git clone https://github.com/b3/include-code-files.git

You can then use the extension in any pandoc file:

```{include="hello.c"}
```

When rendering include the path to include-code-files.lua

pandoc -s --lua-filter=include-code-files.lua test/input.md --output test/output.html

For complete details see following sections below.

The filter can be used without special installation, just by passing the include-code-files.lua file path to pandoc via --lua-filter/-L.

User-global installation is possible by placing the filter within the filters directory of pandoc's user data directory. This allows to use the filter just by using the filename, without having to specify the full file path.

The filter recognizes code blocks with the include attribute present. It swaps the content of the code block with contents from a file.

The simplest way to use this filter is to include an entire file:

```{include="hello.c"}
```

You can still use other attributes, and classes, to control the code blocks:

```{.c include="hello.c" numberLines}
```

If you want to include a specific range of lines, use startLine and endLine:

```{include="hello.c" startLine=35 endLine=80}
```

start-line and end-line alternatives are also recognized.

Using the dedent attribute, you can have whitespaces removed on each line, where possible (non-whitespace character will not be removed even if they occur in the dedent area).

```{include="hello.c" dedent=4}
```

If you include the numberLines class in your code block, and use include, the startFrom attribute will be added with respect to the included code's location in the source file.

```{include="hello.c" startLine=35 endLine=80 .numberLines}
```

An HTML version of input.md can be produced as output.html with this command:

pandoc -s --lua-filter=include-code-files.lua test/input.md --output test/output.html