docs: simplify the find_version script and fix shellcheck report in it

[marex]

Use sed one-liner to extract the version without any temp files.

Fix the following shellcheck report. The cd builtin may fail, handle it gracefully.

In scripts/find_version.sh line 3:
SCRIPTPATH="$( cd -- "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P )"
               ^-- SC2164 (warning): Use 'cd ... || exit' or 'cd ... || return' in case cd fails.

Did you mean:
SCRIPTPATH="$( cd -- "$(dirname "$0")" >/dev/null 2>&1 || exit ; pwd -P )"

For more information:
  https://www.shellcheck.net/wiki/SC2164 -- Use 'cd ... || exit' or 'cd ... |...

[kisvegabor]

Hey,

I've fixed tested it and it works well. Thank you!

[marex]

Hey,

I've fixed tested it and it works well. Thank you!

@kisvegabor thank you.

I have noticed the MRs are all over the place, so let me try to create some sort of order in it:

• docs: simplify the find_version script and fix shellcheck report in it #6133 - probably useful in short term, can be deferred
• fix(docs): pull version out of lv_version.h in python #6135 - useful as a stopgap measure to fix builds on systems without bourne shell
• feat(tools): Python script for automatically applying version (#6012) #6080 - seems like the ultimate final solution

Do I have it right ?

[kisvegabor]

Yes, this issue have many branches now.

I'll merge this PR as a hotfix for non-Linux but #6135 should be superior.

I thought #6080 is not really related as it should help only in releasing to update the versions on all the places. However, with the help this scrip we can hardcode the version in the docs too, and update it with a script before releases.

cc @kdschlosser @becseya

[kisvegabor]

And we have #6143 too.

Finally #6080 should solve all the issues if the version id hardcoded in the docs.