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Hugo-to-Gemini converter

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This repo holds a converter of Hugo Markdown posts to text/gemini (also named Gemtext in this README). The converter is supposed to make people using Hugo's entrance to Project Gemini, the alternate web, somewhat simpler.

The renderer uses the gomarkdown library for parsing Markdown. gomarkdown has a few quirks at this time, the most notable one being unable to parse links/images inside other links.

At this time, gmnhg can convert these Markdown elements to Gemtext:

  • paragraphs, converting them to soft wrap as per Gemini spec p. 5.4.1;
  • inline text formatting (bold, emphasis, strikethrough, code, subscript, superscript), which stays in the text to preserve stylistic context;
  • headings;
  • blockquotes;
  • preformatted blocks;
  • tables, displayed as ASCII preformatted blocks;
  • lists (as Gemini doesn't allow lists of level >= 2, those will be reflected with an extra indentation level): ordered, numbered, definition;
  • links and images, rendered as Gemtext links (inline links are rendered after their parent paragraph or other block element in a links block sorted by element type);
  • footnotes, rendered as paragraphs;
  • horizontal rules.

The renderer will also treat lists of links and paragraphs consisting of links only the special way: it will render only the links block for them.

To get a better idea of how source Markdown looks like after the conversion to Gemtext, see testdata directory.


This program converts Hugo Markdown content files from content/ in accordance with templates found in gmnhg/ to the output dir. It also copies static files from static/ to the output dir.

For more details about the rendering process, see the doc attached to the program.

Usage of gmnhg:
  -output string
        output directory (will be created if missing) (default "output/")
  -working string
        working directory (defaults to current directory)


This program reads Markdown input from either text file (if -f filename is given), or stdin. The resulting Gemtext goes to stdout.

Usage of md2gmn:
  -f string
        input file

md2gmn is mainly made to facilitate testing the Gemtext renderer but can be used as a standalone program as well.

Site configuration

gmnhg will pick up some attributes such as site title, base URL, and language code from your Hugo configuration file (config.toml, config.yaml, or config.json). Presently these are used in the default RSS template.

gmnhg provides a way to override these attributes by defining a gmnhg section in the configuration file and nesting the attributes to override underneath this section. Presently you can override both baseUrl and title in this manner.

For example, you could add the following to your config.toml to override your baseUrl:

baseUrl = "gemini://"

This is recommended, as it will ensure that RSS links on your Gemini site use the correct URL.


This program is redistributed under the terms and conditions of the GNU General Public License, more specifically version 3 of the License. For details, see COPYING.