Module: RedQuilt::CLI

Defined in:
lib/red_quilt/cli.rb

Overview

Entry point for the ‘redquilt` executable. Defined as a module-level function so tests can drive it without shelling out.

CLI.run takes an argv-style array and an optional set of IO objects (stdin / stdout / stderr) for testability. It returns an Integer exit code: 0 on success, 1 on usage errors.

Constant Summary collapse

USAGE = 
<<~USAGE
  Usage: redquilt [options] [file]

  Reads Markdown from FILE (or stdin if FILE is omitted) and writes the
  result to stdout.

  Options:
USAGE
DEFAULTS = 
{
  format: :html,
  allow_html: false,
  disallow_raw_html: false,
  extended_autolinks: false,
  lint: false,
  diagnostics: false,
  diagnostics_only: false,
  standalone: true,
  auto_title: false,
  title: nil,
  lang: nil,
  css: nil,
  theme: :default,
  output: nil,
  open: false,
  mermaid: false,
  frontmatter: false,
}.freeze
THEMES = 
%i[none default].freeze
FORMATS = 
%i[html ast json].freeze

Class Method Summary collapse

Class Method Details

.emit_output(doc, options, source_path:, stdout:, stderr:) ⇒ Object 



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# File 'lib/red_quilt/cli.rb', line 81

def self.emit_output(doc, options, source_path:, stdout:, stderr:)
  destination = output_destination(options, source_path)

  case options[:format]
  when :html
    html = render_html(doc, options)
    if destination
      File.write(destination, html)
    else
      stdout.write(html)
    end
  when :ast
    require "pp"
    PP.pp(doc.to_ast, stdout)
  when :json
    stdout.puts doc.to_json
  end

  BrowserLauncher.new(err: stderr).launch(destination) if options[:open] && destination
end

.output_destination(options, source_path) ⇒ Object 



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# File 'lib/red_quilt/cli.rb', line 102

def self.output_destination(options, source_path)
  return options[:output] if options[:output]
  return nil unless options[:open]

  base = source_path ? File.basename(source_path, ".*") : "stdin"
  File.join(Dir.tmpdir, "redquilt-#{base}.html")
end

.parse_options(argv, stderr:) ⇒ Object 



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# File 'lib/red_quilt/cli.rb', line 110

def self.parse_options(argv, stderr:)
  options = DEFAULTS.dup
  parser = OptionParser.new do |opts|
    opts.banner = USAGE
    opts.on("--format FORMAT", FORMATS, "Output format: html (default), ast, json") do |f|
      options[:format] = f
    end
    opts.on("--allow-html", "Pass raw HTML through to the output") do
      options[:allow_html] = true
    end
    opts.on("--disallow-raw-html",
            "Filter dangerous tags (script, iframe, ...) even with --allow-html (GFM)") do
      options[:disallow_raw_html] = true
    end
    opts.on("--extended-autolinks",
            "Linkify bare URLs and email addresses (GFM)") do
      options[:extended_autolinks] = true
    end
    opts.on("--lint",
            "Emit lint-style diagnostics (empty_link, missing_alt, heading_level_skip)") do
      options[:lint] = true
    end
    opts.on("--[no-]standalone",
            "Wrap (or not) the rendered HTML in a full document (default: on)") do |v|
      options[:standalone] = v
    end
    opts.on("--auto-title",
            "Use the first heading's text as <title> (standalone only)") do
      options[:auto_title] = true
    end
    opts.on("--title TITLE", "Explicit <title> text (standalone only)") do |t|
      options[:title] = t
    end
    opts.on("--lang LANG", "html lang attribute (standalone only; default \"en\")") do |l|
      options[:lang] = l
    end
    opts.on("--css URL", "Add a stylesheet link (standalone only)") do |u|
      options[:css] = u
    end
    opts.on("--theme THEME", THEMES,
            "Embedded stylesheet: default (the default) or none (bare HTML)") do |t|
      options[:theme] = t
    end
    opts.on("-o", "--output FILE", "Write HTML to FILE instead of stdout") do |f|
      options[:output] = f
    end
    opts.on("--open",
            "Write HTML to a file and open it in the default browser (forces --standalone)") do
      options[:open] = true
    end
    opts.on("--mermaid",
            "Render `mermaid` code blocks as diagrams (loads mermaid.js from a CDN in standalone output)") do
      options[:mermaid] = true
    end
    opts.on("--frontmatter",
            "Parse leading YAML frontmatter (---) as metadata; fills <title>/lang in standalone output") do
      options[:frontmatter] = true
    end
    opts.on("--diagnostics", "Also print diagnostics to stderr") do
      options[:diagnostics] = true
    end
    opts.on("--diagnostics-only", "Print diagnostics only (suppress normal output)") do
      options[:diagnostics_only] = true
    end
    opts.on("-h", "--help", "Show this help") do
      stderr.puts opts
      return 0
    end
    opts.on("-v", "--version", "Show version") do
      stderr.puts "redquilt #{RedQuilt::VERSION}"
      return 0
    end
  end

  begin
    parser.parse!(argv)
  rescue OptionParser::ParseError => e
    stderr.puts "redquilt: #{e.message}"
    stderr.puts parser
    return 1
  end

  options
end

.read_source(argv, stdin:, stderr:) ⇒ Object 



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# File 'lib/red_quilt/cli.rb', line 195

def self.read_source(argv, stdin:, stderr:)
  if argv.empty?
    stdin.read
  elsif argv.size == 1
    path = argv.first
    unless File.file?(path)
      stderr.puts "redquilt: no such file: #{path}"
      return nil
    end
    File.read(path)
  else
    stderr.puts "redquilt: too many arguments: #{argv.inspect}"
    nil
  end
end

.render_html(doc, options) ⇒ Object 



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# File 'lib/red_quilt/cli.rb', line 211

def self.render_html(doc, options)
  title = options[:title]
  title = doc.first_heading_text.to_s if title.nil? && options[:auto_title]
  doc.to_html(
    standalone: options[:standalone],
    title: title,
    lang: options[:lang],
    css: options[:css],
    theme: options[:theme],
    mermaid: options[:mermaid],
  )
end

.run(argv, stdin: $stdin, stdout: $stdout, stderr: $stderr) ⇒ Object 



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# File 'lib/red_quilt/cli.rb', line 49

def self.run(argv, stdin: $stdin, stdout: $stdout, stderr: $stderr)
  options = parse_options(argv, stderr: stderr)
  return options if options.is_a?(Integer)

  if options[:open] && options[:format] != :html
    stderr.puts "redquilt: --open requires --format html"
    return 1
  end
  options[:standalone] = true if options[:open]

  source_path = argv.first
  source = read_source(argv, stdin: stdin, stderr: stderr)
  return 1 unless source

  doc = RedQuilt.parse(source,
                       allow_html: options[:allow_html],
                       disallow_raw_html: options[:disallow_raw_html],
                       extended_autolinks: options[:extended_autolinks],
                       lint: options[:lint],
                       frontmatter: options[:frontmatter])

  unless options[:diagnostics_only]
    emit_output(doc, options, source_path: source_path, stdout: stdout, stderr: stderr)
  end

  if options[:diagnostics] || options[:diagnostics_only]
    write_diagnostics(doc.diagnostics, stderr)
  end

  doc.diagnostics.any? { |d| d.severity == :error } ? 1 : 0
end

.write_diagnostics(diagnostics, stderr) ⇒ Object 



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# File 'lib/red_quilt/cli.rb', line 224

def self.write_diagnostics(diagnostics, stderr)
  if diagnostics.empty?
    stderr.puts "redquilt: no diagnostics"
    return
  end
  diagnostics.each do |d|
    stderr.puts "[#{d.severity}] #{d.rule}: #{d.message}"
  end
end