Add support for lua-language-server

ale_linters/lua/lua_language_server.vim

@@ -0,0 +1,15 @@
+" Author: w0rp <dev@w0rp.com>
+" Description: lua-language-server integration (https://github.com/LuaLS/lua-language-server)
+
+call ale#Set('lua_language_server_executable', 'lua-language-server')
+call ale#Set('lua_language_server_config', {})
+
+call ale#linter#Define('lua', {
+\   'name': 'lua_language_server',
+\   'aliases': ['lua-language-server'],
+\   'lsp': 'stdio',
+\   'executable': {b -> ale#Var(b, 'lua_language_server_executable')},
+\   'command': '%e',
+\   'project_root': function('ale#lua#FindProjectRoot'),
+\   'lsp_config': {b -> ale#Var(b, 'lua_language_server_config')},
+\})

autoload/ale/lua.vim

@@ -0,0 +1,28 @@
+" Author: w0rp <dev@w0rp.com>
+" Description: Functions for integrating with Lua linters.
+
+" Find project root for a Lua language server.
+function! ale#lua#FindProjectRoot(buffer) abort
+    let l:possible_project_roots = [
+    \   '.git',
+    \   bufname(a:buffer),
+    \]
+
+    for l:possible_root in l:possible_project_roots
+        let l:project_root = ale#path#FindNearestFile(a:buffer, l:possible_root)
+
+        if empty(l:project_root)
+            let l:project_root = ale#path#FindNearestDirectory(a:buffer, l:possible_root)
+        endif
+
+        if !empty(l:project_root)
+            " dir:p expands to /full/path/to/dir/ whereas
+            " file:p expands to /full/path/to/file (no trailing slash)
+            " Appending '/' ensures that :h:h removes the path's last segment
+            " regardless of whether it is a directory or not.
+            return fnamemodify(l:project_root . '/', ':p:h:h')
+        endif
+    endfor
+
+    return ''
+endfunction

doc/ale-lua.txt

@@ -27,6 +27,30 @@ g:ale_lua_lua_format_options                     *g:ale_lua_lua_format_options*
   This variable can be set to pass additional options to lua-format.
 
 
+===============================================================================
+lua-language-server                               *ale-lua-lua-language-server*
+                                                      *ale-lua-language-server*
+
+g:ale_lua_language_server_executable     *g:ale_lua_language_server_executable*
+                                         *b:ale_lua_language_server_executable*
+  Type: |String|
+  Default: `'lua-language-server'`
+
+  This variable can be changed to set the path to lua-language-server.
+
+  If you have compiled the language server yourself in `/some/path`, the path
+  will be `'/some/path/bin/lua-language-server'`.
+
+
+g:ale_lua_lua_language_server_config     *g:ale_lua_lua_language_server_config*
+                                         *b:ale_lua_lua_language_server_config*
+  Type: |Dictionary|
+  Default: `{}`
+
+  Dictionary containing configuration settings that will be passed to the
+  language server.
+
+
 ===============================================================================
 luac                                                             *ale-lua-luac*
 

doc/ale-supported-languages-and-tools.txt

@@ -341,6 +341,7 @@ Notes:
 * Lua
   * `cspell`
   * `lua-format`
+  * `lua-language-server`
   * `luac`
   * `luacheck`
   * `luafmt`

doc/ale.txt

@@ -3068,6 +3068,7 @@ documented in additional help files.
   lua.....................................|ale-lua-options|
     cspell................................|ale-lua-cspell|
     lua-format............................|ale-lua-lua-format|
+    lua-language-server...................|ale-lua-lua-language-server|
     luac..................................|ale-lua-luac|
     luacheck..............................|ale-lua-luacheck|
     luafmt................................|ale-lua-luafmt|

supported-tools.md

@@ -350,6 +350,7 @@ formatting.
 * Lua
   * [cspell](https://github.com/streetsidesoftware/cspell/tree/main/packages/cspell)
   * [lua-format](https://github.com/Koihik/LuaFormatter)
+  * [lua-language-server](https://github.com/LuaLS/lua-language-server)
   * [luac](https://www.lua.org/manual/5.1/luac.html)
   * [luacheck](https://github.com/mpeterv/luacheck)
   * [luafmt](https://github.com/trixnz/lua-fmt)

test/linter/test_lua_language_server.vader

@@ -0,0 +1,16 @@
+Before:
+  call ale#assert#SetUpLinterTest('lua', 'lua_language_server')
+
+After:
+  call ale#assert#TearDownLinterTest()
+
+Execute(The default lua-language-server settings should be correct):
+  AssertLinter 'lua-language-server', ale#Escape('lua-language-server')
+  AssertLSPConfig {}
+
+Execute(lua-language-server should be configurable):
+  let b:ale_lua_language_server_executable = 'billy'
+  let b:ale_lua_language_server_config = {'x': 'y'}
+
+  AssertLinter 'billy', ale#Escape('billy')
+  AssertLSPConfig {'x': 'y'}