commit a37c643d54ea33285e4c916a296784593af0130c
author Andrew Howe <howeaj@users.noreply.github.com> Mon Mar 29 09:00:18 2021 +0100
committer GitHub <noreply@github.com> Mon Mar 29 10:00:18 2021 +0200
tree 27bb49a2cee462ec2b69f1d6c2395ed1d8059166
parent 42bf3b0f4d2aad3e5b40153cf743021de635836d

Fix various problems with --import-graph filename parsing (#4259)

Avoids backwards-incompatible changes.
 - Raise error if graphvis is not installed (instead of reporting success)
 - Fix tempfile creation bug when outputfile includes directories
 - Fix bug when using file extension that isn't 3 characters long
 - Fix confusing help text
 - Rename deprecated .dot extension to .gv
 - Default to .png if no extension is specified

* Add typing to modified functions (and ignore mypy thinking codecs.open()
returns an int)

Co-authored-by: Pierre Sassoulas <pierre.sassoulas@gmail.com>