Class: Envo::CmdSwap

Inherits:
Object
  • Object
show all
Defined in:
lib/envo/cmd_swap.rb

Constant Summary collapse

Name = 
'swap'

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name_a, name_b) ⇒ CmdSwap

Returns a new instance of CmdSwap.



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# File 'lib/envo/cmd_swap.rb', line 26

def initialize(name_a, name_b)
  @name_a = name_a
  @name_b = name_b
end

Instance Attribute Details

#name_a ⇒ Object

Returns the value of attribute name_a.



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# File 'lib/envo/cmd_swap.rb', line 31

def name_a
  @name_a
end

#name_b ⇒ Object

Returns the value of attribute name_b.



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# File 'lib/envo/cmd_swap.rb', line 31

def name_b
  @name_b
end

Class Method Details

.parse_cli(args) ⇒ Object 



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# File 'lib/envo/cmd_swap.rb', line 16

def self.parse_cli(args)
  opts = CliParser.filter_opts(args)
  parse_tokens(args, opts)
end

.parse_tokens(args, opts) ⇒ Object 



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# File 'lib/envo/cmd_swap.rb', line 21

def self.parse_tokens(args, opts)
  raise Envo::Error.new "swap: provide two names to swap. Use 'swap <name1> <name2>'" if args.size != 2
  ParsedCmd.new(CmdSwap.new(args[0], args[1]), opts)
end

.register_cli_parser(parser) ⇒ Object 



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# File 'lib/envo/cmd_swap.rb', line 8

def self.register_cli_parser(parser)
  parser.add_cmd(Name, ->(cmd, args) { parse_cli(args) })
end

.register_help(help) ⇒ Object 



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# File 'lib/envo/cmd_swap.rb', line 4

def self.register_help(help)
  help.add_cmd 'swap <name1> <name2>', "swap values of two environment variables"
end

.register_script_parser(parser) ⇒ Object 



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# File 'lib/envo/cmd_swap.rb', line 12

def self.register_script_parser(parser)
  parser.add_cmd(Name, ->(cmd, tokens, opts) { parse_tokens(tokens, opts) })
end

Instance Method Details

#execute(ctx) ⇒ Object 



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# File 'lib/envo/cmd_swap.rb', line 33

def execute(ctx)
  ea = ctx.expand_name(@name_a)
  raw_a = ctx.raw_get(ea)
  raise Envo::Error.new "swap: no such var '#{ea}'" if !raw_a && !ctx.force?

  eb = ctx.expand_name(@name_b)
  raw_b = ctx.raw_get(eb)
  raise Envo::Error.new "swap: no such var '#{eb}'" if !raw_b && !ctx.force?

  return if ea == eb # swap something with itself...
  return if !raw_a && !raw_b # no point in doing anything if they don't exist

  ctx.raw_set(ea, raw_b)
  ctx.raw_set(eb, raw_a)
end