def rl_expand_prompt(prompt)
@local_prompt = @local_prompt_prefix = nil
@local_prompt_len = 0
@prompt_last_invisible = @prompt_invis_chars_first_line = 0
@prompt_visible_length = @prompt_physical_chars = 0
if (prompt.nil? || prompt == '')
return (0)
end
pi = prompt.rindex("\n")
if pi.nil?
@local_prompt,@prompt_visible_length,@prompt_last_invisible,@prompt_invis_chars_first_line,@prompt_physical_chars = expand_prompt(prompt)
@local_prompt_prefix = nil
@local_prompt_len = @local_prompt ? @local_prompt.length : 0
return (@prompt_visible_length)
else
pi += 1 if prompt.length!=pi+1
t = pi
@local_prompt,@prompt_visible_length,@prompt_last_invisible,@prompt_invis_chars_first_line,@prompt_physical_chars = expand_prompt(prompt[pi..-1])
c = prompt[t]
prompt[t] = 0.chr
@local_prompt_prefix,@prompt_prefix_length,_,_, = expand_prompt(prompt)
prompt[t] = c
@local_prompt_len = @local_prompt ? @local_prompt.length : 0
return (@prompt_prefix_length)
end
end