Class: ShellOpts::Grammar::Command

Inherits:
IdrNode show all
Defined in:
lib/shellopts/grammar.rb,
lib/shellopts/dump.rb,
lib/shellopts/dump.rb,
lib/shellopts/parser.rb,
lib/shellopts/analyzer.rb,
lib/shellopts/renderer.rb,
lib/shellopts/formatter.rb

Overview

brief one-line commands should optionally use compact options

Direct Known Subclasses

Program

Constant Summary collapse

OPTIONS_ABBR = 
"[OPTIONS]"
COMMANDS_ABBR = 
"[COMMANDS]"
DESCRS_ABBR = 
"ARGS..."

Constants inherited from Node

Node::ALLOWED_PARENTS

Instance Attribute Summary collapse

Attributes inherited from IdrNode

#attr, #command, #ident, #name, #path

Attributes inherited from Node

#children, #parent, #token

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from IdrNode

#dump_doc, #set_name, #uid

Methods inherited from Node

#analyzer_error, #ancestors, #dump_ast, #dump_attrs, #inspect, #parents, parse, #parser_error, #remove_arg_descr_nodes, #remove_arg_spec_nodes, #remove_brief_nodes, #traverse

Constructor Details

#initialize(parent, token) ⇒ Command

Returns a new instance of Command.



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# File 'lib/shellopts/grammar.rb', line 224

def initialize(parent, token)
  @brief = nil
  @default_brief = nil
  @description = []
  @option_groups = []
  @options = []
  @options_hash = {} # Initialized by the analyzer
  @commands = []
  @commands_hash = {} # Initialized by the analyzer
  @specs = []
  @descrs = []
  super
end

Instance Attribute Details

#brief ⇒ Object

Brief description of command



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# File 'lib/shellopts/grammar.rb', line 202

def brief
  @brief
end

#commands ⇒ Object (readonly)

Array of sub-commands. Initialized by the parser but edited by the analyzer



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# File 'lib/shellopts/grammar.rb', line 216

def commands
  @commands
end

#description ⇒ Object (readonly)

Description of command. Array of Paragraph or Code objects. Initialized by the parser



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# File 'lib/shellopts/grammar.rb', line 206

def description
  @description
end

#descrs ⇒ Object (readonly)

Array of ArgDescr objects. Initialized by the parser



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# File 'lib/shellopts/grammar.rb', line 222

def descrs
  @descrs
end

#option_groups ⇒ Object (readonly)

Array of option groups in declaration order. Initialized by the parser TODO: Rename ‘groups’



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# File 'lib/shellopts/grammar.rb', line 210

def option_groups
  @option_groups
end

#options ⇒ Object (readonly)

Array of options in declaration order. Initialized by the analyzer



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# File 'lib/shellopts/grammar.rb', line 213

def options
  @options
end

#specs ⇒ Object (readonly)

Array of Arg objects. Initialized by the parser



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# File 'lib/shellopts/grammar.rb', line 219

def specs
  @specs
end

Class Method Details

.command(obj) ⇒ Object

Shorthand to get the associated Grammar::Command object from a Program or a Grammar::Command object



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# File 'lib/shellopts/grammar.rb', line 258

def self.command(obj)
  constrain obj, Command, ::ShellOpts::Program
  obj.is_a?(Command) ? obj : obj.__grammar__
end

Instance Method Details

#[](key) ⇒ Object

Maps from any (sub-)path, name or identifier of an option or command (including the suffixed ‘!’) to the associated option. #[] and #key? can’t be used until after the analyze phase



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# File 'lib/shellopts/grammar.rb', line 241

def [](key)
  case key
    when String; lookup(key.split("."))
    when Symbol; lookup(key.to_s.gsub(".", "!.").split(".").map(&:to_sym))
    when Array; lookup(key)
  else
    nil
  end
end

#collect_options ⇒ Object 



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# File 'lib/shellopts/analyzer.rb', line 23

def collect_options
  @options = option_groups.map(&:options).flatten
end

#compute_command_hashes ⇒ Object

TODO Check for dash-collision



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# File 'lib/shellopts/analyzer.rb', line 54

def compute_command_hashes
  commands.each { |command|
    !@commands_hash.key?(command.name) or 
        analyzer_error command.token, "Duplicate command name: #{command.name}"
    @commands_hash[command.name] = command
    @commands_hash[command.ident] = command
    command.compute_command_hashes
  }
end

#compute_option_hashes ⇒ Object 



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# File 'lib/shellopts/analyzer.rb', line 40

def compute_option_hashes
  options.each { |option|
    option.idents.zip(option.names).each { |ident, name|
      !@options_hash.key?(name) or 
          analyzer_error option.token, "Duplicate option name: #{name}"
      @options_hash[name] = option
      !@options_hash.key?(ident) or 
          analyzer_error option.token, "Can't use both #{@options_hash[ident].name} and #{name}"
      @options_hash[ident] = option
    }
  }
end

#dump_idr(short = false) ⇒ Object 



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# File 'lib/shellopts/dump.rb', line 102

def dump_idr(short = false)
  if short
    puts name
    indent { 
      options.each { |option| option.dump_idr(short) }
      commands.each { |command| command.dump_idr(short) }
      descrs.each { |descr| descr.dump_idr(short) }
    } 
  else
    puts "#{name}: #{classname}"
    dump_attrs :uid, :path, :ident, :name, :options, :commands, :specs, :descrs, :brief
  end
end

#dump_structure(device = $stdout) ⇒ Object 



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# File 'lib/shellopts/dump.rb', line 22

def dump_structure(device = $stdout)
  device.puts ident
  device.indent { |dev|
    option_groups.each { |group| dev.puts group.options.map(&:name).join(" ") }
    commands.each { |command| command.dump_structure(dev) }
    descrs.each { |descr| dev.puts descr.text }
  }
end

#key?(key) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/shellopts/grammar.rb', line 251

def key?(key) !self.[](key).nil? end

#keys ⇒ Object

Mostly for debug. Has questional semantics because it only lists local keys



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# File 'lib/shellopts/grammar.rb', line 254

def keys() @options_hash.keys + @commands_hash.keys end

#names(root: false) ⇒ Object 



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# File 'lib/shellopts/renderer.rb', line 102

def names(root: false)
  (root ? ancestors : []) + [self]
end

#parse ⇒ Object 



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# File 'lib/shellopts/parser.rb', line 109

def parse
  if parent
    path_names = token.source.sub("!", "").split(".")
    set_name(
        path_names.last,
        path_names.map { |cmd| "#{cmd}!".to_sym })
  else
    set_name(token.source, [])
  end
  super
end

#puts_brief ⇒ Object 



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# File 'lib/shellopts/formatter.rb', line 49

def puts_brief
  width = Formatter.rest
  option_briefs = option_groups.map { |group| [group.render(:enum), group.brief&.words] }
  command_briefs = commands.map { |command| [command.render(:single, width), command.brief&.words] }
  widths = Formatter::compute_columns(width, option_briefs + command_briefs)

  if brief
    puts brief
    puts
  end

  puts "Usage"
  indent { puts_usage(bol: true, max_width: Formatter::HELP_MAX_WIDTH) }

  if options.any?
    puts
    puts "Options"
    indent { Formatter::puts_columns(widths, option_briefs) }
  end

  if commands.any?
    puts
    puts "Commands"
    indent { Formatter::puts_columns(widths, command_briefs) }
  end
end

#puts_descr(prefix, brief: !self.brief.nil?,, name: :path) ⇒ Object 



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# File 'lib/shellopts/formatter.rb', line 76

def puts_descr(prefix, brief: !self.brief.nil?, name: :path)
  # Use one-line mode if all options are declared on one line
  if options.all? { |option| option.token.lineno == token.lineno }
    puts Ansi.bold([prefix, render(:single, Formatter.rest)].flatten.compact.join(" "))
    puts_options = false
  else
    puts Ansi.bold([prefix, render(:abbr, Formatter.rest)].flatten.compact.join(" "))
    puts_options = true
  end

  indent {
    if brief
      puts self.brief.words.wrap(Formatter.rest)
    else
      newline = false
      children.each { |child|
        puts if newline
        newline = true

        if child.is_a?(Command)
          child.puts_descr(prefix, name: :path)
        elsif child.is_a?(OptionGroup)
          child.puts_descr if puts_options
          newline = false
        else
          child.puts_descr
        end
      }
    end
  }
end

#puts_help ⇒ Object 



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# File 'lib/shellopts/formatter.rb', line 108

def puts_help
  puts Ansi.bold "NAME"
  full_name = [Formatter::command_prefix, name].join
  indent { puts brief ? "#{full_name} - #{brief}" : full_name }
  puts

  puts Ansi.bold "USAGE"
  indent { puts_usage(bol: true, max_width: Formatter::HELP_MAX_WIDTH) }

  section = {
    Paragraph => "DESCRIPTION",
    OptionGroup => "OPTION",
    Command => "COMMAND"
  }
  seen_sections = {}
  newline = false # True if a newline should be printed before child 
  indent {
    children.each { |child|
      klass = child.is_a?(Section) ?  section.key(child.name) : child.class
      if s = section[klass] # Implicit section
        section.delete(klass)
        section.delete(Paragraph)
        if klass <= OptionGroup
          s += "S" if options.size > 1
        elsif klass <= Command
          s += "S" if commands.size > 1 || commands.size == 1 && commands.first.commands.size > 1
        end
        puts
        indent(-1).puts Ansi.bold s
        newline = false
        next if child.is_a?(Section)
      else # Any other node adds a newline
        puts if newline
        newline = true
      end

      if child.is_a?(Command)
        prefix = child.path[path.size..-2].map { |sym| sym.to_s.sub(/!/, "") }
        child.puts_descr(prefix, brief: false, name: :path)
        newline = true
       else
        child.puts_descr
        newline = true
      end
    }

    # Also emit commands not declared in nested scope
    (commands - children.select { |child| child.is_a?(Command) }).each { |cmd|
      next if cmd.parent.nil? # Skip implicit commands
      puts if newline
      newline = true
      prefix = cmd.command == self ? nil : cmd.command&.name
      cmd.puts_descr(prefix, brief: false, name: path)
    }
  }
end

#puts_usage(bol: false, max_width: Formatter::USAGE_MAX_WIDTH) ⇒ Object 



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# File 'lib/shellopts/formatter.rb', line 33

def puts_usage(bol: false, max_width: Formatter::USAGE_MAX_WIDTH)
  width = [Formatter.rest, max_width].min
  if descrs.size == 0
    print (lead = Formatter.command_prefix || "")
    indent(lead.size, ' ', bol: bol && lead == "") { 
      puts render(:multi, width) 
    }
  else
    lead = Formatter.command_prefix || ""
    descrs.each { |descr|
      print lead
      puts render(:multi, width, args: descr.text.split(' ')) 
    } 
  end
end

#render(format, width, root: false, **opts) ⇒ Object

Format can be one of :abbr, :single, :enum, or :multi. :abbr lists the command on one line with options abbreviated. :single force one-line output and compacts options and commands if needed. :enum outputs a :single line for each argument specification/description, :multi tries one-line output but wrap options if needed. Multiple argument specifications/descriptions are always compacted



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# File 'lib/shellopts/renderer.rb', line 91

def render(format, width, root: false, **opts)
  case format
    when :abbr; render_abbr
    when :single; render_single(width, **opts)
    when :enum; render_enum(width, **opts)
    when :multi; render_multi(width, **opts)
  else
    raise ArgumentError, "Illegal format: #{format.inspect}"
  end
end

#render_structure ⇒ Object

Usable after parsing



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# File 'lib/shellopts/dump.rb', line 16

def render_structure
  io = StringIO.new
  dump_structure(io)
  io.string
end

#reorder_options ⇒ Object

Move options before first command or before explicit COMMAND section



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# File 'lib/shellopts/analyzer.rb', line 28

def reorder_options
  if commands.any?
    i = children.find_index { |child| 
      child.is_a?(Command) || child.is_a?(Section) && child.name == "COMMAND"
    }
    if i
      options, rest = children[i+1..-1].partition { |child| child.is_a?(OptionGroup) }
      @children = children[0, i] + options + children[i..i] + rest
    end
  end
end