Support zls language server for zig

ale_linters/zig/zls.vim

@@ -0,0 +1,20 @@
+" Author: CherryMan <skipper308@hotmail.ca>
+" Description: A language server for Zig
+
+call ale#Set('zig_zls_executable', 'zls')
+call ale#Set('zig_zls_config', {})
+
+function! ale_linters#zig#zls#GetProjectRoot(buffer) abort
+    let l:build_rs = ale#path#FindNearestFile(a:buffer, 'build.zig')
+
+    return !empty(l:build_rs) ? fnamemodify(l:build_rs, ':h') : ''
+endfunction
+
+call ale#linter#Define('zig', {
+\   'name': 'zls',
+\   'lsp': 'stdio',
+\   'lsp_config': {b -> ale#Var(b, 'zig_zls_config')},
+\   'executable': {b -> ale#Var(b, 'zig_zls_executable')},
+\   'command': '%e',
+\   'project_root': function('ale_linters#zig#zls#GetProjectRoot'),
+\})

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

@@ -510,3 +510,5 @@ Notes:
   * `yamllint`
 * YANG
   * `yang-lsp`
+* Zig
+  * `zls`

doc/ale-zig.txt

@@ -0,0 +1,33 @@
+===============================================================================
+ALE Zig Integration                                           *ale-zig-options*
+                                                          *ale-integration-zig*
+
+===============================================================================
+Integration Information
+
+  Currently, the only supported linter for zig is zls.
+
+===============================================================================
+zls                                                               *ale-zig-zls*
+
+g:ale_zig_zls_executable                             *g:ale_zig_zls_executable*
+                                                     *b:ale_zig_zls_executable*
+  Type: |String|
+  Default: `'zls'`
+
+  This variable can be modified to change the executable path for `zls`.
+
+
+g:ale_zig_zls_config                                     *g:ale_zig_zls_config*
+                                                         *b:ale_zig_zls_config*
+  Type: |Dictionary|
+  Default: `{}`
+
+  WARNING: As of writing, zls does not support receiving configuration
+  from the client. This variable is a PLACEHOLDER until it does.
+
+  Dictionary with configuration settings for zls.
+
+
+===============================================================================
+  vim:tw=78:ts=2:sts=2:sw=2:ft=help:norl:

doc/ale.txt

@@ -2676,6 +2676,8 @@ documented in additional help files.
     yamllint..............................|ale-yaml-yamllint|
   yang....................................|ale-yang-options|
     yang-lsp..............................|ale-yang-lsp|
+  zig.....................................|ale-zig-options|
+    zls...................................|ale-zig-zls|
 
 
 ===============================================================================

supported-tools.md

@@ -519,3 +519,5 @@ formatting.
   * [yamllint](https://yamllint.readthedocs.io/)
 * YANG
   * [yang-lsp](https://github.com/theia-ide/yang-lsp)
+* Zig
+  * [zls](https://github.com/zigtools/zls)

test/command_callback/test_zig_zls_callbacks.vader

@@ -0,0 +1,15 @@
+Before:
+  call ale#assert#SetUpLinterTest('zig', 'zls')
+
+After:
+  call ale#assert#TearDownLinterTest()
+
+Execute(The default executable path should be correct):
+  AssertLinter 'zls', ale#Escape('zls')
+
+Execute(The project root should be detected correctly):
+  AssertLSPProject ''
+
+  call ale#test#SetFilename('zig-zls-project/main.zig')
+
+  AssertLSPProject ale#path#Simplify(g:dir . '/zig-zls-project')