Short Ruby script to convert blog posts with Jekyll frontmatter into blog posts with Zola frontmatter.

convert-jekyll-to-zola.rb

#!/usr/bin/env ruby

require "yaml"

#
# We want to convert this:
#
#---
#layout: post
#published: true
#title: "Fabric Art History"
#date: 2017-07-10
#categories: [self]
#tags: [fabric]
#---
#
# Into this:
#
#+++
#title = "Fabric Art History"
#date = 2017-07-10
#
#[taxonomies]
#categories = ["self"]
#tags = ["fabric"]
#+++
#

data = nil
File.open(ARGV[0], "r") do |f|
  # read in data from file
  data = f.read().split("\n")
end

# find the start and end of the jekyll frontmatter
fm_start = -1
fm_end = -1
data.each_with_index() do |line, i|
  if line.start_with?("---") and fm_start == -1
    fm_start = i
  elsif line.start_with?("---")
    fm_end = i
    break
  end
end

# bail if we couldn't find it
if fm_start == -1 or fm_end == -1
  abort "Could not find start and end of Jekyll frontmatter!"
end

# load the jekyll frontmatter
jfm = YAML.load_file(ARGV[0])

# build the tera frontmatter
tfm = "+++\n"
tfm += "title = \"#{jfm["title"]}\"\n"
tfm += "date = #{jfm["date"]}\n"
tfm += "\n[taxonomies]\n"
tfm += "categories = #{jfm["categories"]}\n"
tfm += "tags = #{jfm["tags"]}\n"
tfm += "+++\n\n"

File.open(ARGV[0], "w") do |f|
  f.write(tfm + data[fm_end+1..-1].join("\n"))
end