(in-file (org-babel-temp-file "ledger-"))
(out-file (org-babel-temp-file "ledger-output-")))
(with-temp-file in-file (insert body))
(in-file (org-babel-temp-file "ledger-"))
(out-file (org-babel-temp-file "ledger-output-")))
(with-temp-file in-file (insert body))