Module: Tabry::ShellTokenizer

Defined in:
lib/tabry/shell_tokenizer.rb

Constant Summary collapse

COMP_POINT_SENTINEL = 
"\uFFFF"

Class Method Summary collapse

Class Method Details

.split(str) ⇒ Object 



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# File 'lib/tabry/shell_tokenizer.rb', line 46

def split(str)
  Shellwords.split(str)
end

.split_with_comppoint(cmd_line, comp_point) ⇒ Object

Use Shellwords.split() to split a command line + comp point (index of the cursor in the command line) into the args up to the current token plus current token

Returns [cmd_name, args, last_arg] cmd_name is the basename of the command run



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# File 'lib/tabry/shell_tokenizer.rb', line 20

def split_with_comppoint(cmd_line, comp_point)
  # TODO: in weird scenarios this acts weird: namely, special shell operators like <(ls), $$((1 + 1))
  # Also it crashed on unbalanced quotes, like: foo "bar<TAB>
  # however, this will handle the common scenarios of escaping with quotes, single quotes, and backslashes
  # Split up args and put the argument that comp_point is in in the `last_arg` variable.
  # Just cutting off everything after comp_point might have worked, although
  # maybe we wanted the whole arg? Not sure this is the best.
  cmd_line = cmd_line.dup
  cmd_line[comp_point.to_i...comp_point.to_i] = COMP_POINT_SENTINEL
  all_tokens = Shellwords.split(cmd_line)

  # ignore all tokens after the one with the sentinel, then replace the COMP_POINT_SENTINEL.
  # the last token is now the token which the cursor is on (the entire token, not just before the cursor)
  last_arg_index = all_tokens.index { |arg| arg.include?(COMP_POINT_SENTINEL) }
  all_tokens = all_tokens[0..last_arg_index]
  all_tokens.last.gsub! COMP_POINT_SENTINEL, ""

  # take last_arg first -- will always be non-null (it will be empty if input string is empty).
  last_arg = all_tokens.pop
  cmd = all_tokens.shift

  cmd_name = cmd&.gsub(%r{.*/}, "")

  [cmd_name, all_tokens, last_arg]
end