racket: support racket-langserver lsp (#3808)

* racket: support racket-langserver lsp

* racket-langserver: find highest dir with init.rkt

* autoload/ale/racket: re-indent to 4 spaces

* racket: lint: sort supported tools

* racket: lint: function!

This is _not_ needed anymore, but the lint wants it. See :help E127

* racket-langserver: do not use new dict format

* racket: lint: use snake_case

* add tests for racket-langserver

* racket-langserver tests: correct result values

1 files changed, 45 insertions, 0 deletions

diff --git a/test/linter/test_racket_langserver.vader b/test/linter/test_racket_langserver.vader
new file mode 100644
index 00000000..021eb565
--- /dev/null
+++ b/test/linter/test_racket_langserver.vader
@@ -0,0 +1,45 @@
+" Author: D. Ben Knoble <https://github.com/benknoble>
+" Description: Tests for racket-langserver lsp linter.
+Before:
+  call ale#assert#SetUpLinterTest('racket', 'langserver')
+
+After:
+  call ale#assert#TearDownLinterTest()
+
+Execute(command callback should return default string):
+  AssertLinter 'racket', ale#Escape('racket').' -l racket-langserver'
+
+Execute(should set racket-langserver for deep module 3):
+  call ale#test#SetFilename('../test-files/racket/many-inits/a/b/c/foo.rkt')
+  AssertLSPLanguage 'racket'
+  AssertLSPOptions {}
+  AssertLSPConfig {}
+  AssertLSPProject ale#test#GetFilename('../test-files/racket/many-inits')
+
+Execute(should set racket-langserver for deep module 2):
+  call ale#test#SetFilename('../test-files/racket/many-inits/a/b/foo.rkt')
+  AssertLSPLanguage 'racket'
+  AssertLSPOptions {}
+  AssertLSPConfig {}
+  AssertLSPProject ale#test#GetFilename('../test-files/racket/many-inits')
+
+Execute(should set racket-langserver for deep module 1):
+  call ale#test#SetFilename('../test-files/racket/many-inits/a/foo.rkt')
+  AssertLSPLanguage 'racket'
+  AssertLSPOptions {}
+  AssertLSPConfig {}
+  AssertLSPProject ale#test#GetFilename('../test-files/racket/many-inits')
+
+Execute(should set racket-langserver for top-level module):
+  call ale#test#SetFilename('../test-files/racket/many-inits/foo.rkt')
+  AssertLSPLanguage 'racket'
+  AssertLSPOptions {}
+  AssertLSPConfig {}
+  AssertLSPProject ale#test#GetFilename('../test-files/racket/many-inits')
+
+Execute(should set racket-langserver for non-package module or script):
+  call ale#test#SetFilename('../test-files/racket/simple-script/foo.rkt')
+  AssertLSPLanguage 'racket'
+  AssertLSPOptions {}
+  AssertLSPConfig {}
+  AssertLSPProject ale#test#GetFilename('../test-files/racket/simple-script')