Manipulate dialog colours in IRB

🤣.rb

# save this peice of code in your ~/.irbrc

module Reline
  DUMMY = ->() {                             
    # autocomplete                                                              
    return nil unless config.autocompletion                                     
    if just_cursor_moving and completion_journey_data.nil?                      
      # Auto complete starts only when edited                                   
      return nil                                                                
    end                                                                         
    pre, target, post = retrieve_completion_block(true)                         
    if target.nil? or target.empty? or (completion_journey_data&.pointer == -1 and target.size <= 3)
      return nil                                                                
    end                                                                         
    if completion_journey_data and completion_journey_data.list                 
      result = completion_journey_data.list.dup                                 
      result.shift                                                              
      pointer = completion_journey_data.pointer - 1                             
    else                                                                        
      result = call_completion_proc_with_checking_args(pre, target, post)       
      pointer = nil                                                             
    end                                                                         
    if result and result.size == 1 and result[0] == target and pointer != 0     
      result = nil                                                              
    end                                                                         
    target_width = Reline::Unicode.calculate_width(target)                      
    x = cursor_pos.x - target_width                                             
    if x < 0                                                                    
      x = screen_width + x                                                      
      y = -1                                                                    
    else                                                                        
      y = 0                                                                     
    end                                                                         
    cursor_pos_to_render = Reline::CursorPos.new(x, y)                          
    if context and context.is_a?(Array)                                         
      context.clear                                                             
      context.push(cursor_pos_to_render, result, pointer, dialog)               
    end                                                                         
    dialog.pointer = pointer                                                    
    DialogRenderInfo.new(                                                       
      pos: cursor_pos_to_render,                                                
      contents: result,                                                         
      scrollbar: true,                                                          
      height: [15, preferred_dialog_height].min,                                
      bg_color: 40,         ## *** modify me ***                                       
      pointer_bg_color: 32, ## *** modify me ***                                       
      fg_color: 92,         ## *** modify me ***                                 
      pointer_fg_color: 90  ## *** modify me ***                                         
    )                                                                           
  }                   
end

Reline.add_dialog_proc(:dummy, Reline::DUMMY)