do_help (sample/psql.rb)

    # File sample/psql.rb, line 338
    def do_help(topic)
      if !topic
        printf("type \\h <cmd> where <cmd> is one of the following:\n")

        left_center_right = 'L' # Start with left column
        for i in 0..QL_HELP.length-1
          case left_center_right
          when  'L'
            printf("    %-25s", QL_HELP[i][0])
            left_center_right = 'C'

          when 'C'
            printf("%-25s", QL_HELP[i][0])
            left_center_right = 'R'

          when 'R'
            printf("%-25s\n", QL_HELP[i][0])
            left_center_right = 'L'

          end
        end
        if (left_center_right != 'L')
          STDOUT.print("\n")
        end
        printf("type \\h * for a complete description of all commands\n")
      else
        help_found = FALSE
        for i in 0..QL_HELP.length-1
          if QL_HELP[i][0] == topic || topic == "*"
            help_found = TRUE
            printf("Command: %s\n", QL_HELP[i][0])
            printf("Description: %s\n", QL_HELP[i][1])
            printf("Syntax:\n")
            printf("%s\n", QL_HELP[i][2])
            printf("\n")
          end
        end
        if !help_found
          printf("command not found, ")
          printf("try \\h with no arguments to see available help\n")
        end
      end
    end