Re: [babel] Expand code is failing on a #+call line

["Sebastien Vauban" <wxhgmqzgwmuf-geNee64TY+gS+FvcfC7Uqw@public.gmane.org>]

Hi Eric,

Eric Schulte wrote:
> This is a minor point, but would you mind structuring your emails with
> an introduction of pure-prose (no embedded examples), saving the
> examples for the end (footnotes work well for this).  I often find it
> disjointing to try to ingest large code example while simultaneously
> trying to figure out the high-level point of the email.

Point noted. OK.

> As to this specific question... I am not sure where you are trying to
> expand a code block.  It seems as if you are trying to expand a call
> line, but I do not believe that is supposed to be possible.

As for any other code block, all I want is to see its expanded (instantiated)
version before I run it.

Is this not doable when you call the code block remotely (I mean: from
a #+call line, instead of from the code block itself)?

If not, does that mean we better not put code block into the lob, when we're
interested by having a look at their expanded form?

Best regards,
  Seb

> "Sebastien Vauban" <wxhgmqzgwmuf-geNee64TY+gS+FvcfC7Uqw@public.gmane.org> writes:
>
>> Hi Eric,
>>
>> * Config
>>
>> ** Some file to be ingested
>>
>> Let's say I have this code in a =my-lob.org= file:
>>
>> #+srcname: add-column-in-table(table="", column="", type="", nullability="")
>> #+begin_src sql
>> -- add column `$column' (if column does not exist yet)
>> IF NOT EXISTS (SELECT *
>>                FROM INFORMATION_SCHEMA.COLUMNS
>>                WHERE TABLE_NAME = '$table'
>>                AND COLUMN_NAME = '$column')
>> BEGIN
>>     ALTER TABLE $table
>>     ADD $column $type $nullability
>> END
>> #+end_src
>>
>> ** In .emacs
>>
>> ... which I ingest at Emacs startup through the lines:
>>
>> #+begin_src emacs-lisp
>> (require 'ob-lob)
>> (org-babel-lob-ingest "~/org/my-lob.org")
>> #+end_src
>>
>> * Some other document
>>
>> ** Source params
>>
>> In some other document, I have a table with columns I'd like to add in a
>> database:
>>
>> #+results: params
>> | table   | column         | type        | nullability |
>> |---------+----------------+-------------+-------------|
>> | dossier | pfiResetDate   | date        | NULL        |
>> | dossier | pfiResetOprID  | tinyint     | NULL        |
>> | dossier | pfiResetOprNom | varchar(64) | NULL        |
>>
>> Normally, I could call statements like this:
>>
>> #+call: add-column-in-table(table=params[2,0], column=params[2,1], type=params[2,2], nullability=params[2,3])
>>
>> But...
>>
>> ** Expand code is failing
>>
>> =C-c C-v C-v= does generate an error:
>>
>>     setf: Wrong type argument: consp, nil
>>
>> #+begin_src text
>> Debugger entered--Lisp error: (wrong-type-argument consp nil)
>>   setcar(nil ((:cache . "") (:comments . "") (:exports . "") (:noweb . "") (:padline . "") (:results . "") (:shebang . "") (:tangle . "")))
>>   (setf (nth 2 info) (sort (org-babel-merge-params ... params) (lambda ... ...)))
>>   (let* ((info ...) (lang ...) (params ...) (body ...) (expand-cmd ...) (assignments-cmd ...) (expanded ...)) (org-edit-src-code nil expanded (concat "*Org-Babel Preview " ... "[ " lang " ]*")))
>>   org-babel-expand-src-block()
>>   call-interactively(org-babel-expand-src-block nil nil)
>> #+end_src
>>
>> This stays very unclear to me...
>>
>> ** Execute code is failing
>>
>> By the way, =C-c C-v C-e= returns as well an error:
>>
>>     let: Wrong type argument: stringp, nil
>>
>> This is explainable: that's because the SQL =engine= is not known (not given
>> neither in the header of the code block, neither anywhere in this file).
>>
>> #+begin_src text
>> Debugger entered--Lisp error: (wrong-type-argument stringp nil)
>>   intern(nil)
>>   (let ((--cl-var-- ...)) (cond (... ...) (... ...) (... ...) (t ...)))
>>   (case (intern engine) ((quote msosql) (format "osql %s -s \"	\" -i %s -o %s" ... ... ...)) ((quote mysql) (format "mysql %s < %s > %s" ... ... ...)) ((quote postgresql) (format "psql -A -P footer=off -F \"	\"  -f %s -o %s %s" ... ... ...)) (t (error "no support for the %s sql engine" engine)))
>>   (let* ((result-params ...) (cmdline ...) (engine ...) (in-file ...) (out-file ...) (header-delim "") (command ...)) (with-temp-file in-file (insert ...)) (message command) (shell-command command) (if (or ... ... ... ... ...) (with-temp-buffer ...) (with-temp-buffer ... ... ...)))
>>   org-babel-execute:sql("-- add column `$column' (if column does not exist yet)\nIF NOT EXISTS (SELECT *\n               FROM INFORMATION_SCHEMA.COLUMNS\n               WHERE TABLE_NAME = '$table'\n               AND COLUMN_NAME = '$column')\nBEGIN\n    ALTER TABLE $table\n    ADD $column $type $nullability\nEND" ((:var table . "dossier") (:var column . "pfiResetDate") (:var type . "date") (:var nullability . "NULL") (:colname-names) (:rowname-names) (:result-params "silent" "replace") (:result-type . value) (:comments . "") (:shebang . "") (:cache . "no") (:padline . "") (:noweb . "no") (:tangle . "no") (:exports . "code") (:results . "silent") (:padnewline . "yes") (:hlines . "no") (:session . "none") (:result-type . value) (:result-params "replace") (:rowname-names) (:colname-names))
 )
>  
>> #+end_src
>>
>> Though, I guess we should have a proper manner to report that some necessary
>> arguments are missing, instead of failing with a unclear message.
>>
>> ** Other weirdnesses
>>
>> While the variable =org-babel-library-of-babel= contains the ingested code
>> (here, of =add-column-in-table=), the variable =org-babel-lob-files= is =nil=!?
>>
>> ** Speed commands
>>
>> Speed commands don't work on the =#+call= lines. If I press =v= or =e=, they're
>> inserted verbatim.
>>
>> Can you help me understand the 1^st point of these 4?  Thanks a lot!!

-- 
Sebastien Vauban