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#!/usr/bin/env ruby
require 'html/pipeline'
require 'optparse'
# Accept "help", too
.map! { |a| a == 'help' ? '--help' : a }
onParser.new do |opts|
opts.banner = <<-HELP.gsub(/^ /, '')
Usage: html-pipeline [-h] [-f]
html-pipeline [FILTER [FILTER [...]]] < file.md
cat file.md | html-pipeline [FILTER [FILTER [...]]]
HELP
opts.separator 'Options:'
opts.on('-f', '--filters', 'List the available filters') do
filters = HTML::Pipeline.constants.grep(/\w+Filter$/)
.map { |f| f.to_s.gsub(/Filter$/, '') }
# Text filter doesn't work, no call method
filters -= ['Text']
abort <<-HELP.gsub(/^ /, '')
Available filters:
#{filters.join("\n ")}
HELP
end
end.parse!
# Default to a GitHub-ish pipeline
if ARGV.empty?
filters = [
HTML::Pipeline::MarkdownFilter,
HTML::Pipeline::SanitizationFilter,
HTML::Pipeline::ImageMaxWidthFilter,
HTML::Pipeline::EmojiFilter,
HTML::Pipeline::AutolinkFilter,
HTML::Pipeline::TableOfContentsFilter
]
# Add syntax highlighting if rouge is present
begin
require 'rouge'
filters << HTML::Pipeline::SyntaxHighlightFilter
rescue LoadError
end
else
def filter_named(name)
case name
when 'Text'
raise NameError # Text filter doesn't work, no call method
end
HTML::Pipeline.const_get("#{name}Filter")
rescue NameError => e
abort "Unknown filter '#{name}'. List filters with the -f option."
end
filters = []
until ARGV.empty?
name = ARGV.shift
filters << filter_named(name)
end
end
context = {
asset_root: '/assets',
base_url: '/',
gfm: true
}
puts HTML::Pipeline.new(filters, context).call(ARGF.read)[:output]
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