On Sep 7, 2021, at 10:37 AM, Augusto Stoffel <arstoffel@gmail.com> wrote:

On Mon, 6 Sep 2021 at 13:53, Andreas Schwab <schwab@linux-m68k.org> wrote:

On Sep 06 2021, Michael Albinus wrote:

Andreas Schwab <schwab@linux-m68k.org> writes:

Okay, so is the TTY line length limit of the OS available in Lisp
somewhere? Otherwise, can we at least trust that 1024 is the universal
lower bound?

On systems with a POSIX shell:

(let ((default-directory "/"))
(read (shell-command-to-string "getconf LINE_MAX")))

LINE_MAX has nothing to do with the tty line discipline.

I'll never learn it :-(

We've discussed this issue some years ago already. IIRC, the outcome was
to use "getconf PIPE_BUF /" instead.

Neither has PIPE_BUF.

Andreas.

Okay then. Since there seem to be no better alternatives, I have
attached a new patch reducing the limit to a hard-coded 1024 bytes. If
some day someone adds a variable specifying a more precise limit, then
we can change this.

I have also rearranged things a bit so that the setup code is sent to
the inferior process just once, rather than of on every call to
`python-shell-send-string'. This way, the smaller line length limit
doesn't increase too much the use of temp files, which, as I mentioned,
is slow over ssh.

It would be great if someone with access to a BSD-like OS could test
this. I can only test locally on Linux and over ssh between Linux
machines.

PS: I have some more suggestions around the Python shell. Is the ideal
workflow to keep creating bugs with a small patch to each improvement,
or do you prefer to review a larger collection of changes bundled
together?

<0001-Reduce-limit-of-line-length-sent-to-the-Python-infer.patch>

Debugger entered--returning value: nil

comint-send-string(#<process filedate> "__PYTHON_EL_eval_file(\"/var/folders/kf/zdpzgs9d30b3jj4bdkdjf1vw0000gn/T/pybQ7oBh\", \"/var/folders/kf/...")

python-shell-send-file("/var/folders/kf/zdpzgs9d30b3jj4bdkdjf1vw0000gn/T/p..." #<process filedate> "/var/folders/kf/zdpzgs9d30b3jj4bdkdjf1vw0000gn/T/p..." t)

python-shell-send-string("try:\n import ast\n with open('/var/folders/kf...")

org-babel-python--send-string("*filedate*" "import ast\nwith open('/var/folders/kf/zdpzgs9d30b3...")

org-babel-python-evaluate-session("*filedate*" "file=\"Roster_Report.csv\"\nimport os\nimport time\npri..." value ("raw" "replace"))

org-babel-python-evaluate("*filedate*" "file=\"Roster_Report.csv\"\nimport os\nimport time\npri..." value ("raw" "replace") nil)

org-babel-execute:python("import os\nimport time\nprint(time.strftime(\"%Y-%m-%..." ((:var file . "Roster_Report.csv") (:colname-names) (:rowname-names) (:result-params "raw" "replace") (:result-type . value) (:results . "raw replace") (:exports . "results") (:cache . "no") (:noweb . "no") (:hlines . "no") (:async . "yes") (:tangle . "reports.py") (:comments . "both") (:session . "filedate")))

org-babel-execute-src-block(nil ("python" "import os\nimport time\nprint(time.strftime(\"%Y-%m-%..." ((:var file . "Roster_Report.csv") (:colname-names) (:rowname-names) (:result-params "replace" "raw") (:result-type . value) (:results . "replace raw") (:exports . "results") (:session . "filedate") (:comments . "both") (:tangle . "reports.py") (:async . "yes") (:hlines . "no") (:noweb . "no") (:cache . "no")) "" "file_date" 7735 "(ref:%s)"))

org-ctrl-c-ctrl-c(nil)

funcall-interactively(org-ctrl-c-ctrl-c nil)

command-execute(org-ctrl-c-ctrl-c)

If I look at the file passed, pybQ7oBh, the contents looks like it will open another file.

try:

import ast

with open('/var/folders/kf/zdpzgs9d30b3jj4bdkdjf1vw0000gn/T/babel-K4MbU2/python-hNII4l') as __org_babel_python_tmpfile:

__org_babel_python_ast = ast.parse(__org_babel_python_tmpfile.read())

__org_babel_python_final = __org_babel_python_ast.body[-1]

if isinstance(__org_babel_python_final, ast.Expr):

__org_babel_python_ast.body = __org_babel_python_ast.body[:-1]

exec(compile(__org_babel_python_ast, '<string>', 'exec'))

__org_babel_python_final = eval(compile(ast.Expression(

__org_babel_python_final.value), '<string>', 'eval'))

with open('/var/folders/kf/zdpzgs9d30b3jj4bdkdjf1vw0000gn/T/babel-K4MbU2/python-ra4ysF', 'w') as __org_babel_python_tmpfile:

if False:

import pprint

__org_babel_python_tmpfile.write(pprint.pformat(__org_babel_python_final))

else:

__org_babel_python_tmpfile.write(str(__org_babel_python_final))

else:

exec(compile(__org_babel_python_ast, '<string>', 'exec'))

__org_babel_python_final = None

except:

raise

finally:

print('org_babel_python_eoe')