Implement statix Linter and Fixer (#3969)

* Add Statix for Linting

Add `statix check` as a linter. Provides a simple set of definition
tests additionally. Variable names specify "check" to allow for later
addition of `statix fix` as a formatter once stream support is added.

Signed-off-by: David Houston <houstdav000@gmail.com>

* Fixup Supported Tools List

I didn't realise there were two separate lists of tools, so add statix
to the other list. Also, remembered "S" comes after "R", and so
re-ordered it.

Signed-off-by: David Houston <houstdav000@gmail.com>

* Fix statix Test File

I refactored the variables for statix to allow for writing a fixer
later, and forgot to update them in the test, so update them now. Also
remove a stray "i", add missing space before checks

Signed-off-by: David Houston <houstdav000@gmail.com>

* Update Output Stream for v0.4.0

statix v0.4.0 provides a breaking change of output stream from stderr to
stdout.

Signed-off-by: David Houston <houstdav000@gmail.com>

* Add statix fix Fixer

Implement statix fix as a fixer for simple Nix antipatterns.

Signed-off-by: David Houston <houstdav000@gmail.com>

* Fix statix Fixer Tests

Fix the statix fixer tests by removing the unnecessary
'read_temporary_file' value from the command, since it simply uses the
default value.

Signed-off-by: David Houston <houstdav000@gmail.com>

* Add statix Handler Test

Add a test for the statix handler per @hsanson's request.

Signed-off-by: David Houston <houstdav000@gmail.com>

* Fix to run only on stdin for linting

Signed-off-by: David Houston <houstdav000@gmail.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/test/fixers/test_statix_fixer.vader b/test/fixers/test_statix_fixer.vader
new file mode 100644
index 00000000..c55365a6
--- /dev/null
+++ b/test/fixers/test_statix_fixer.vader
@@ -0,0 +1,18 @@
+Before:
+  call ale#assert#SetUpFixerTest('nix', 'statix')
+
+After:
+  call ale#assert#TearDownFixerTest()
+
+Execute(The callback should return the correct default values):
+  AssertFixer { 'command': ale#Escape('statix') . ' fix --stdin' }
+
+Execute(The callback should include a custom runtime):
+  let g:ale_nix_statix_fix_executable = 'foo/bar'
+
+  AssertFixer { 'command': ale#Escape('foo/bar') . ' fix --stdin' }
+
+Execute(The callback should include custom options):
+  let g:ale_nix_statix_fix_options = '--foobar'
+
+  AssertFixer { 'command': ale#Escape('statix') . ' fix --stdin --foobar' }