|Subject:||Library of Babel usage of other programming languages than elisp|
|Date:||Mon, 9 Aug 2021 12:52:41 +0000|
Hello Org-mode users!
I have repeatedly tried to use another programming language than
elisp for writing source blocks in org-mode, which I intended to
use as functions inside org-mode spreadsheets. So far without
Here is my latest attempt:
~~~~ START ~~~~ #+HEADER: :var dt1="uninitialized1" dt2="uninitialized2" #+name: org-lob-timediff #+begin_src scheme (import (ice-9 format) (srfi srfi-19)) (define org-timestamp->time-utc (λ (timestamp-string) (let ([parsed-date (string->date timestamp-string "[~Y-~m-~d ~a ~H:~M]")]) (date->time-utc parsed-date)))) (define duration->hours (λ (duration) ;; 1h = 60min = 3600s (/ (time-second duration) 3600))) (define org-lob-timediff (λ (org-dt1 org-dt2) ;; formatting float: ;; ~@width, decimals, scale, overflowchar, padchar ;; ~ placeholder is following ;; @ with sign if negative ;; width: minimum width ;; decimals: minimum number of digits after decimal point ;; scale: ??? ;; overflowchar: ??? ;; padchar: char to use for padding (format #f "~,2f" (number->string (exact->inexact (duration->hours (time-difference (org-timestamp->time-utc org-dt2) (org-timestamp->time-utc org-dt1)))))))) #+end_src #+CALL: org-lob-timediff(dt1="[2021-01-01 Fri 00:00]", dt2="[2021-01-01 Fri 01:45]") #+RESULTS: ~~~~ END ~~~~
This code works just fine in geiser using GNU Guile:
~~~~ START ~~~~ scheme@(guile-user)> (org-lob-timediff "[2021-01-01 Fri 00:00]" "[2021-01-01 Fri 01:45]") $4 = "1.75" ~~~~ END ~~~~
However, when I C-c C-c the `CALL` line to actually run the code using library of babel, as a precursor to using `org-sbe` inside a spreadsheet, it fails! I see the following in my *Messages* buffer:
~~~~ START ~~~~ executing Scheme code block... (dt1 '"[2021-01-01 Fri 00:00]") (dt2 '"[2021-01-01 Fri 01:45]") Starting Geiser REPL ... [3 times] Guile REPL up and running! Debug REPL. Enter ,q to quit, ,h for help. => ice-9/boot-9.scm:1685:16: In procedure raise-exception: Wrong type to apply: #<syntax-transformer time-second> Entering a new prompt. Type `,bt' for a backtrace or `,q' to continue. scheme@(guile-user) > Error during redisplay: (jit-lock-function 315) signaled (wrong-type-argument markerp nil) Code block evaluation complete. ~~~~ END ~~~~
So something obviously is getting confused. `time-second` is not a syntax-transformer. It is a procedure:
~~~~ START ~~~~ scheme@(guile-user)> time-second $5 = #<procedure %time-second-procedure (s)> ~~~~ END ~~~~
Now I have many questions:
+ What am I doing wrong? How comes perfectly valid code does not
work in LOB?
+ Can LOB even be used with other languages than Elisp?
+ Almost all examples I see online are elisp only. Perhaps I am trying to do something, that is impossible with current Org-mode and Library of Babel?
-- repositories: https://notabug.org/ZelphirKaltstahl
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