Add support for Julia Language Server (#1894)

autoload/ale/julia.vim

@@ -0,0 +1,19 @@
+" Author: Bartolomeo Stellato bartolomeo.stellato@gmail.com
+" Description: Functions for integrating with Julia tools
+
+" Find the nearest dir containing a julia project
+let s:__ale_julia_project_filenames = ['REQUIRE', 'Manifest.toml', 'Project.toml']
+
+function! ale#julia#FindProjectRoot(buffer) abort
+    for l:project_filename in s:__ale_julia_project_filenames
+        let l:full_path = ale#path#FindNearestFile(a:buffer, l:project_filename)
+
+        if !empty(l:full_path)
+            let l:path = fnamemodify(l:full_path, ':p:h')
+
+            return l:path
+        endif
+    endfor
+
+    return ''
+endfunction