Re: [PATCH] Add tests for ob-haskell (GHCi)

[Ihor Radchenko <yantar92@posteo.net>]

Bruno Barbier <brubar.cs@gmail.com> writes:

> About :results output vs :results value, I decided to use the "it"
> variable, i.e. to ask GHCi what was the last value (see [1]).
>
> About sessions, I decided to rename the buffer as you suggested. That's
> a partial workaround that should work well enough, until haskell-mode
> provides a way to choose the buffer name.
>
> I've updated the tests and the expected results.

Thanks!
I will provide comments inline.

> Note that I've changed the tests about errors; I'm now expecting
> ob-haskell to raise errors. I'm not sure what we should expect to be
> consistent with other org babel backends.

Errors are usually displayed separately, using
`org-babel-eval-error-notify'.

> +;; To increase the chances of failure when running tests, you can use this command line:
> +;;
> +;;    (for I in 0 1 2 3 4 5 6 7 8 9 10 0 1 2 3 4 5 6 7 8 9 10 0 1 2 3 4 5 6 7 8 9 10; do make 'BTEST_OB_LANGUAGES=haskell' BTEST_RE='haskell' test-dirty & done) 2>&1 | grep FAILED
> +;;
> +
> +;;;; Status
> +;;
> +;; All the tests should succeed (except for random failures); those
> +;; flagged with ":expected-result :failed" are known
> +;; limitations/bugs.  Tested with (2023-03-18):
> +;;
> +;;     | emacs-version |                      29.0.60 |
> +;;     | org-version   | main@4cad6c8ea (Mar 16 2023) |
> +;;     | haskell-mode  | master@20d4e23 (Mar 4  2023) |
> +;;     | ghci          |                        9.0.2 |

You can probably remove this.

> +                (`value (org-babel-comint-with-output
> +		            (session org-babel-haskell-eoe nil full-body)
> +                          (insert "__LAST_VALUE_IMPROBABLE_NAME__=()::()\n")
> +                          (comint-send-input nil t)
> +                          (insert full-body)
> +                          (comint-send-input nil t)
> +                          (insert "__LAST_VALUE_IMPROBABLE_NAME__=it\n")
> +                          (comint-send-input nil t)
> +                          (insert (concat "putStrLn (\"\\\"\" ++ " org-babel-haskell-eoe " ++ \"\\\"\")\n"))

Why not simply putStrLn ("\"" ++ show it ++ "\"") ?

> +  (when (and session-name (string= session-name "none"))
> +    (setq session-name nil))
> +  (unless session-name
> +    ;; As haskell-mode is using the buffer name "*haskell*", we stay
> +    ;; away from it.
> +    (setq session-name (generate-new-buffer-name "*ob-haskell*")))

This will make ob-haskell spawn a separate ghci process buffer every
single time a user runs non-session src block. And the buffer is not
closed after getting the result.

-- 
Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <https://orgmode.org/>.
Support Org development at <https://liberapay.com/org-mode>,
or support my work at <https://liberapay.com/yantar92>