Close #2472 - Add support for pyright

ale_linters/python/pyright.vim

@@ -0,0 +1,43 @@
+call ale#Set('python_pyright_executable', 'pyright-langserver')
+call ale#Set('python_pyright_config', {})
+
+function! ale_linters#python#pyright#GetConfig(buffer) abort
+    let l:config = deepcopy(ale#Var(a:buffer, 'python_pyright_config'))
+
+    if !has_key(l:config, 'python')
+        let l:config.python = {}
+    endif
+
+    if type(l:config.python) is v:t_dict
+        " Automatically detect the virtualenv path and use it.
+        if !has_key(l:config.python, 'venvPath')
+            let l:venv = ale#python#FindVirtualenv(a:buffer)
+
+            if !empty(l:venv)
+                let l:config.python.venvPath = l:venv
+            endif
+        endif
+
+        " Automatically use the version of Python in virtualenv.
+        if type(get(l:config.python, 'venvPath')) is v:t_string
+        \&& !empty(l:config.python.venvPath)
+        \&& !has_key(l:config.python, 'pythonPath')
+            let l:config.python.pythonPath = ale#path#Simplify(
+            \   l:config.python.venvPath
+            \   . (has('win32') ? '/Scripts/python' : '/bin/python')
+            \)
+        endif
+    endif
+
+    return l:config
+endfunction
+
+call ale#linter#Define('python', {
+\   'name': 'pyright',
+\   'lsp': 'stdio',
+\   'executable': {b -> ale#Var(b, 'python_pyright_executable')},
+\   'command': '%e --stdio',
+\   'project_root': function('ale#python#FindProjectRoot'),
+\   'completion_filter': 'ale#completion#python#CompletionItemFilter',
+\   'lsp_config': function('ale_linters#python#pyright#GetConfig'),
+\})