When editing python code the linters tools have a hard time with our
imports as they can't be found. To ease this we can expand a
PYTHONPATH in .dir-locals so at least Emacs users can have less
warnings in their editor.

I still get complaints from python-mypy about missing library stubs
that mean it can't do proper type analysis though.

Signed-off-by: Alex Bennée <[email protected]>
---
 .dir-locals.el | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/.dir-locals.el b/.dir-locals.el
index 3ac0cfc6f0d..51871619422 100644
--- a/.dir-locals.el
+++ b/.dir-locals.el
@@ -1,2 +1,8 @@
 ((c-mode . ((c-file-style . "stroustrup")
-           (indent-tabs-mode . nil))))
+           (indent-tabs-mode . nil)))
+ (python-mode .
+              ((eval . (when-let* ((root (locate-dominating-file 
default-directory ".dir-locals.el")))
+                         (setq-local process-environment (copy-sequence 
process-environment))
+                         (setenv "PYTHONPATH"
+                                 (concat (expand-file-name "python" root) ":"
+                                         (expand-file-name "tests/functional" 
root))))))))
-- 
2.47.3


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