Dan Davison <dandavis...@gmail.com> writes: > Eric S Fraga <ucec...@ucl.ac.uk> writes: > >> Dan <dandavis...@gmail.com> writes: >> >> [...] >> >>> This patch should make ob-ledger use the common org-babel error mechanism. >>> It is >>> in branch ledger of the main repo. However, I'm not yet a ledger user. Could >>> someone test it? >> >> Unfortunately, it doesn't work at all [1] for a very simple reason: you >> have removed the -f option which specifies the file that ledger should >> read. > > Hi Eric, > > Yes, ob-eval passes the src block body to the interpreter on standard > input. I assumed that ledger would be able to read its transaction data > from standard input. Is that not the case? What about with "--file -" > or "-f -"?
> [...] > If ledger can't read the src blocks body from stdin (and if it can't, I > expect there's a good reason why not), then maybe this is a motivation > for changing ob-eval so that the block body is read from file. Indeed, ledger cannot read from standard input. From the man page: ,---- | All commands require a Ledger data file which can be specified with -f | filename or via the LEDGER_FILE environment variable. `---- and later: ,---- | -f, --file FILE | | Reads FILE as a Ledger file. This option may be specified multiple | times. FILE may also be a list of file names separated by colons. | Typically, the environment variable LEDGER_FILE is set rather than | using this command-line option. `---- Using an environment variable is not a good or viable solution for babel, as far as I can figure, and there does not seem to be any concept of "-" for standard input in lieu of a file. I cannot see any reason for this and, to be honest, I find it annoying [1] as a long time Unix user wishing to join tools together with pipes etc. But maybe John Wiegley had his reasons for taking this decision. Maybe he can comment on this... I think he reads this list? > Incidentally, I have for a long time wondered whether we should permit > src blocks to read *input data* from standard input. This would require > altering ob-eval such that the src block body is read from file. Then we > could do things like > > #+source: output-some-text > #+begin_src sh :results output > # print stuff > #+end_src > #+begin_src perl :stdin output-some-text > while ( <> ) { > # process the text > } > #+end_src This could be a solution. In thinking about all of my babel uses, this would have no impact on me but others may have different opinions? It would seem to be a safer route in any case? Thanks, eric Footnotes: [1] but not annoying enough to stop using ledger, of course, as it's a brilliant tool otherwise! -- : Eric S Fraga (GnuPG: 0xC89193D8FFFCF67D) in Emacs 23.2.1 : using Org-mode version 7.3 (release_7.3.99.g9db0.dirty) _______________________________________________ Emacs-orgmode mailing list Please use `Reply All' to send replies to the list. Emacs-orgmode@gnu.org http://lists.gnu.org/mailman/listinfo/emacs-orgmode