Class: Gel::Command

Inherits:
Object
  • Object
show all
Defined in:
lib/gel/command.rb

Direct Known Subclasses

Config, Env, Exec, Help, Install, InstallGem, Lock, Ruby, ShellSetup, Stub, Update

Defined Under Namespace

Classes: Config, Env, Exec, Help, Install, InstallGem, Lock, Ruby, ShellSetup, Stub, Update

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Attribute Details

#reraise ⇒ Object

If set to true, an error raised from #run will pass straight up to ruby instead of being treated as an internal Gel error



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# File 'lib/gel/command.rb', line 73

def reraise
  @reraise
end

Class Method Details

.extract_word(arguments) ⇒ Object 



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# File 'lib/gel/command.rb', line 65

def self.extract_word(arguments)
  if idx = arguments.index { |w| w =~ /^[^-]/ }
    arguments.delete_at(idx)
  end
end

.handle_error(ex) ⇒ Object 



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# File 'lib/gel/command.rb', line 31

def self.handle_error(ex)
  case ex
  when Gel::ReportableError
    $stderr.puts "ERROR: #{ex.message}"
    if more = ex.details
      $stderr.puts more
    end

    exit ex.exit_code
  when Interrupt
    # Re-signal so our parent knows why we died
    Signal.trap(ex.signo, "SYSTEM_DEFAULT")
    Process.kill(ex.signo, Process.pid)

    # Shouldn't be reached
    raise ex
  when SystemExit, SignalException
    raise ex
  when StandardError, ScriptError, NoMemoryError, SystemStackError
    # We want basically everything here: we definitely care about
    # StandardError and ScriptError... but we also assume that whatever
    # caused NoMemoryError or SystemStackError was way down the call
    # stack, so we've now unwound enough to safely handle even those.

    $stderr.print "\n\n===== Gel Internal Error =====\n\n"

    # We'll improve this later, but for now after the header we'll leave
    # ruby to write the message & backtrace:
    raise ex
  else
    raise ex
  end
end

.run(command_line) ⇒ Object 



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# File 'lib/gel/command.rb', line 7

def self.run(command_line)
  command_line = command_line.dup
  if command_name = extract_word(command_line)
    const = command_name.downcase.sub(/^./, &:upcase).gsub(/[-_]./) { |s| s[1].upcase }
    if Gel::Command.const_defined?(const, false)
      command = Gel::Command.const_get(const, false).new
      command.run(command_line)
    elsif Gel::Environment.activate_for_executable(["gel-#{command_name}", command_name])
      command_name = "gel-#{command_name}" if Gel::Environment.find_executable("gel-#{command_name}")
      command = Gel::Command::Exec.new
      command.run([command_name, *command_line])
    else
      raise Gel::Error::UnknownCommandError.new(command_name: command_name)
    end
  else
    puts <<~EOF
    Gel doesn't have a default command; please run `gel install`
    EOF
  end
rescue Exception => ex
  raise if $DEBUG || (command && command.reraise)
  handle_error(ex)
end