An example of generating IIF file with Riif.

example.rb

Riif::IIF.new.trns do
  row do
    trnsid 123
    trnstype 'INVOICE'
    date '8/31/1988'
    accnt 'Accounts Receivable'
    name 'Customer'
    amount 20
    docnum 1
    clear 'N'
    toprint 'N'
    addr1 'Baker'
    addr2 'Customer'
  end

  spl do
    row do
      splid '777'
      trnstype 'INVOICE'
      date '8/31/1988'
      accnt 'Income Account'
      amount '-20'
      clear 'N'
      qnty '-2'
      price 10
      invitem 'Sales Item'
      taxable 'N'
    end
  end

  spl do
    row do
      splid '888'
    end
  end
end

result.iif

!TRNS	TRNSID	TRNSTYPE	DATE	ACCNT	NAME	CLASS	AMOUNT	DOCNUM	MEMO	CLEAR	TOPRINT	ADDR1	ADDR2	ADDR3	ADDR4	ADDR5	DUEDATE	TERMS	PAID	SHIPDATE
!SPL	SPLID	TRNSTYPE	DATE	ACCNT	NAME	CLASS	AMOUNT	DOCNUM	MEMO	CLEAR	QNTY	PRICE	INVITEM	PAYMETH	TAXABLE	REIMBEXP	EXTRA
!ENDTRNS
TRNS	123	INVOICE	8/31/1988	Accounts Receivable	Customer		20	1		N	N	Baker	Customer
SPL	777	INVOICE	8/31/1988	Income Account			-20			N	-2	10	Sales Item		N
SPL	888
ENDTRNS

Example usage of https://github.com/linjunpop/riif