#517 Support linter settings needed for LSP, undocumented for now

autoload/ale/linter.vim

@@ -51,6 +51,7 @@ function! ale#linter#PreProcess(linter) abort
 
     let l:obj = {
     \   'name': get(a:linter, 'name'),
+    \   'lsp': get(a:linter, 'lsp', ''),
     \   'callback': get(a:linter, 'callback'),
     \}
 
@@ -62,7 +63,27 @@ function! ale#linter#PreProcess(linter) abort
         throw '`callback` must be defined with a callback to accept output'
     endif
 
-    if has_key(a:linter, 'executable_callback')
+    let l:needs_executable = 0
+    let l:needs_address = 0
+    let l:needs_command = 0
+
+    if l:obj.lsp ==# 'tsserver'
+        let l:needs_executable = 1
+    elseif l:obj.lsp ==# 'lsp'
+        let l:needs_address = 1
+    elseif !empty(l:obj.lsp)
+        throw '`lsp` must be either `''lsp''` or `''tsserver''` if defined'
+    else
+        let l:needs_executable = 1
+        let l:needs_command = 1
+    endif
+
+    if !l:needs_executable
+        if has_key(a:linter, 'executable')
+        \|| has_key(a:linter, 'executable_callback')
+            throw '`executable` and `executable_callback` cannot be used when lsp == ''lsp'''
+        endif
+    elseif has_key(a:linter, 'executable_callback')
         let l:obj.executable_callback = a:linter.executable_callback
 
         if !s:IsCallback(l:obj.executable_callback)
@@ -78,7 +99,13 @@ function! ale#linter#PreProcess(linter) abort
         throw 'Either `executable` or `executable_callback` must be defined'
     endif
 
-    if has_key(a:linter, 'command_chain')
+    if !l:needs_command
+        if has_key(a:linter, 'command')
+        \|| has_key(a:linter, 'command_callback')
+        \|| has_key(a:linter, 'command_chain')
+            throw '`command` and `command_callback` and `command_chain` cannot be used when `lsp` is set'
+        endif
+    elseif has_key(a:linter, 'command_chain')
         let l:obj.command_chain = a:linter.command_chain
 
         if type(l:obj.command_chain) != type([])
@@ -138,6 +165,20 @@ function! ale#linter#PreProcess(linter) abort
         \   . 'should be set'
     endif
 
+    if !l:needs_address
+        if has_key(a:linter, 'address_callback')
+            throw '`address_callback` cannot be used when lsp != ''lsp'''
+        endif
+    elseif has_key(a:linter, 'address_callback')
+        let l:obj.address_callback = a:linter.address_callback
+
+        if !s:IsCallback(l:obj.address_callback)
+            throw '`address_callback` must be a callback if defined'
+        endif
+    else
+        throw '`address_callback` must be defined for getting the LSP address'
+    endif
+
     let l:obj.output_stream = get(a:linter, 'output_stream', 'stdout')
 
     if type(l:obj.output_stream) != type('')

test/test_linter_defintion_processing.vader

@@ -365,3 +365,74 @@ Execute(PreProcess should accept `aliases` lists):
   let g:linter.aliases = ['foo', 'bar']
 
   AssertEqual ['foo', 'bar'], ale#linter#PreProcess(g:linter).aliases
+
+Execute(PreProcess should accept tsserver LSP configuration):
+  let g:linter = {
+  \ 'name': 'x',
+  \ 'executable': 'x',
+  \ 'lsp': 'tsserver',
+  \ 'callback': 'x',
+  \}
+
+  AssertEqual 'tsserver', ale#linter#PreProcess(g:linter).lsp
+
+  call remove(g:linter, 'executable')
+  let g:linter.executable_callback = 'X'
+
+  call ale#linter#PreProcess(g:linter).lsp
+
+Execute(PreProcess should complain about commands being set for LSP configurations):
+  let g:linter = {
+  \ 'name': 'x',
+  \ 'executable': 'x',
+  \ 'lsp': 'tsserver',
+  \ 'command': 'x',
+  \ 'callback': 'x',
+  \}
+
+  AssertThrows call ale#linter#PreProcess(g:linter)
+  AssertEqual '`command` and `command_callback` and `command_chain` cannot be used when `lsp` is set', g:vader_exception
+
+  call remove(g:linter, 'command')
+  let g:linter.command_callback = 'X'
+
+  AssertThrows call ale#linter#PreProcess(g:linter)
+  AssertEqual '`command` and `command_callback` and `command_chain` cannot be used when `lsp` is set', g:vader_exception
+
+  call remove(g:linter, 'command_callback')
+  let g:linter.command_chain = []
+
+  AssertThrows call ale#linter#PreProcess(g:linter)
+  AssertEqual '`command` and `command_callback` and `command_chain` cannot be used when `lsp` is set', g:vader_exception
+
+Execute(PreProcess should accept LSP server configurations):
+  let g:linter = {
+  \ 'name': 'x',
+  \ 'lsp': 'lsp',
+  \ 'callback': 'x',
+  \ 'address_callback': 'X',
+  \}
+
+  AssertEqual 'lsp', ale#linter#PreProcess(g:linter).lsp
+
+Execute(PreProcess should require an address_callback for LSP server configurations):
+  let g:linter = {
+  \ 'name': 'x',
+  \ 'lsp': 'lsp',
+  \ 'callback': 'x',
+  \}
+
+  AssertThrows call ale#linter#PreProcess(g:linter)
+  AssertEqual '`address_callback` must be defined for getting the LSP address', g:vader_exception
+
+Execute(PreProcess should complain about address_callback for non-LSP linters):
+  let g:linter = {
+  \ 'name': 'x',
+  \ 'callback': 'SomeFunction',
+  \ 'executable': 'echo',
+  \ 'command': 'echo',
+  \ 'address_callback': 'X',
+  \}
+
+  AssertThrows call ale#linter#PreProcess(g:linter)
+  AssertEqual '`address_callback` cannot be used when lsp != ''lsp''', g:vader_exception

test/test_linter_retrieval.vader

@@ -1,8 +1,8 @@
 Before:
   Save g:ale_linters, g:ale_linter_aliases
 
-  let g:testlinter1 = {'name': 'testlinter1', 'executable': 'testlinter1', 'command': 'testlinter1', 'callback': 'testCB1', 'output_stream': 'stdout', 'read_buffer': 1, 'lint_file': 0, 'aliases': []}
-  let g:testlinter2 = {'name': 'testlinter2', 'executable': 'testlinter2', 'command': 'testlinter2', 'callback': 'testCB2', 'output_stream': 'stdout', 'read_buffer': 0, 'lint_file': 1, 'aliases': []}
+  let g:testlinter1 = {'name': 'testlinter1', 'executable': 'testlinter1', 'command': 'testlinter1', 'callback': 'testCB1', 'output_stream': 'stdout', 'read_buffer': 1, 'lint_file': 0, 'aliases': [], 'lsp': ''}
+  let g:testlinter2 = {'name': 'testlinter2', 'executable': 'testlinter2', 'command': 'testlinter2', 'callback': 'testCB2', 'output_stream': 'stdout', 'read_buffer': 0, 'lint_file': 1, 'aliases': [], 'lsp': ''}
   call ale#linter#Reset()
 
 After:
@@ -105,4 +105,4 @@ Execute (The local alias option shouldn't completely replace the global one):
   AssertEqual [g:testlinter1, g:testlinter2], ale#linter#Get('testft1')
 
 Execute (Linters should be loaded from disk appropriately):
-  AssertEqual [{'name': 'testlinter', 'output_stream': 'stdout', 'executable': 'testlinter', 'command': 'testlinter', 'callback': 'testCB', 'read_buffer': 1, 'lint_file': 0, 'aliases': []}], ale#linter#Get('testft')
+  AssertEqual [{'name': 'testlinter', 'output_stream': 'stdout', 'executable': 'testlinter', 'command': 'testlinter', 'callback': 'testCB', 'read_buffer': 1, 'lint_file': 0, 'aliases': [], 'lsp': ''}], ale#linter#Get('testft')