fix(zls): include `build.zig` in root dir search (#2933)

File `build.zig` by convention sits at the root dir and thus can be used
to correctly identify the root directory.

This is particularly useful if `zls` has `enable_build_on_save` set to
`true`, since then the language server uses workspace path (root_dir) to
execute `zig build` command, output of which is then used to publish
diagnostic errors.

Without `build.zig` root directory can incorrectly be deduced some
layers too high at the root of the git repo. In such case
`enable_build_on_save` silently fails and does not report build error
diagnostics.

1 files changed, 2 insertions, 2 deletions

diff --git a/lua/lspconfig/server_configurations/zls.lua b/lua/lspconfig/server_configurations/zls.lua
index d890fb63..d92a797d 100644
--- a/lua/lspconfig/server_configurations/zls.lua
+++ b/lua/lspconfig/server_configurations/zls.lua
@@ -4,7 +4,7 @@ return {
   default_config = {
     cmd = { 'zls' },
     filetypes = { 'zig', 'zir' },
-    root_dir = util.root_pattern('zls.json', '.git'),
+    root_dir = util.root_pattern('zls.json', 'build.zig', '.git'),
     single_file_support = true,
   },
   docs = {
@@ -14,7 +14,7 @@ https://github.com/zigtools/zls
 Zig LSP implementation + Zig Language Server
         ]],
     default_config = {
-      root_dir = [[util.root_pattern("zls.json", ".git")]],
+      root_dir = [[util.root_pattern("zls.json", "build.zig", ".git")]],
     },
   },
 }