Convert Firefox Bookmarks JSON export files to Org-mode format

firefox_bookmarks_json_to_org.rb

#!/usr/bin/env ruby

# firefox_bookmarks_json_to_org.rb
# convert JSON files exported from Firefox Bookmarks Backup
# to https://orgmode.org/ format
#
# Copyright (C) 2021 Juri Linkov  <juri@linkov.net>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

# Usage: ruby firefox_bookmarks_json_to_org.rb bookmarks-date.json > bookmarks-date.org
# where bookmarks-date.json is exported from Firefox by:
# 1. Type Control-Shift-O
# 2. Click "Import and Backup -> Backup..." and "Save"

# It's useful first to export JSON to YAML with:
# ruby -rjson -ryaml -e 'puts(JSON.load(ARGF).to_yaml)' bookmarks-date.json > bookmarks-date.yaml
# to inspect the output, if you need to export more data to org-mode format.

require 'json'
require 'cgi'

json = JSON.parse(ARGF.read, object_class: OpenStruct)

def process(json, level)
  case json.typeCode
  when 2 # type: text/x-moz-place-container
    puts "#{'*' * (level < 1 ? 1 : level)} #{json.title}"
    print "  [#{Time.at(0, json.dateAdded / 1000.0, :millisecond)}]"
    print  " [#{Time.at(0, json.lastModified / 1000.0, :millisecond)}]"
    puts
    json.children.sort_by{|j| [j.typeCode == 2 ? 1 : 0, j.index]}.each do |child|
      process(child, level + 1)
    end if json.children
  when 1 # type: text/x-moz-place
    puts "- #{json.title}"
    puts "  #{begin CGI.unescape(json.uri).gsub(/ /, '%20') rescue json.uri end}"
    print "  [#{Time.at(0, json.dateAdded / 1000.0, :millisecond)}]"
    print  " [#{Time.at(0, json.lastModified / 1000.0, :millisecond)}]"
    puts
  when 3 # type: text/x-moz-place-separator
    puts ""
  else
    STDERR.puts "! Wrong typeCode: #{json.typeCode}"
  end
end

process(json, -1)