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Md2Vim

Writing technical documentation for Vim extensions is not very exciting; having to manually convert what you've just written in Markdown to the vimdoc help format is even less fun. As I grew tired of doing this over and over for my ArgWrap extension, I decided to formally solve this problem for myself and others, creating the Md2Vim converter tool.

Md2Vim is implemented in Golang as a custom renderer for the blackfriday Markdown processor. Maintainability, ease of use, and beautiful vimdoc output were primary considerations in its design.

Installation

If you already have the Go environment and toolchain set up, you can get the latest version by running:

$ go get github.com/FooSoft/md2vim

Otherwise, you can use the pre-built binaries for the platforms below:

Example

Let's generate the documentation for ArgWrap by executing the command shown below (split into multiple lines due to length considerations):

$ md2vim \
    -desc "Wrap and unwrap function arguments, lists, and dictionaries in Vim" \
    -cols=120 \
    README.md \
    doc/argwrap.txt

Below is an animation of the vimdoc file being generated by Md2Vim and displayed inside of Vim. The curious may also wish to examine the raw markdown input and the raw vimdoc output used in this example to get a better idea of how the markdown structure is transformed to vimdoc.

Usage

Executing Md2Vim with the -help command line argument will trigger online help to be displayed. The list below provides a more detailed description of what the parameters do.

  • cols

    The number of columns used for laying out vimdoc files to make them look as good as possible with your content. Notice that file contents will not be wrapped to this value; this is purely for such things as horizontal rule widths and help tag positioning. This defaults to 80, but that's a bit too narrow for some people.

  • desc

    Vim help files are supposed to start with the following two fields on the first line:

    filename.txt Description of this help file's contents
    

    The first field is the filename of the generated vimdoc help file; the second is the description can you provide with this parameter.

  • norules

    By default, we generate horizontal rules above level 1-2 headings, as shown below:

    ================================================================================
    Level 1 Heading
    --------------------------------------------------------------------------------
    Level 2 Heading
    

    If you don't like the way it looks you can turn it off.

  • notoc

    If you don't wish to generate a table of contents you should set this flag to opt out. The table of contents lists all of the headings in the document and is always inserted before the beginning of document body.

  • pascal

    By default, all help tags get converted to lower case and space delimited words are joined with underscores.

    rigellians-how_to_cook_for_fourty_humans
    

    If you prefer the PascalCase way of doing things, set this flag and your output will look like this:

    Rigellians-HowToCookForFourtyHumans
    
  • tabs

    If you don't like four space tabs for some reason you can change it to something else with this parameter.