feat(jsonnet): add JSONNET_PATH environmental variable to cmd_env (#1437)

* root_dir/lib and root_dir /vendor are common jsonnet library paths.
* the jsonnet language server can use the JSONNET_PATH env variable to
resolve referenced files within these folders

1 files changed, 14 insertions, 0 deletions

diff --git a/lua/lspconfig/jsonnet_ls.lua b/lua/lspconfig/jsonnet_ls.lua
index d467429b..34bc3910 100644
--- a/lua/lspconfig/jsonnet_ls.lua
+++ b/lua/lspconfig/jsonnet_ls.lua
@@ -1,6 +1,15 @@
 local configs = require 'lspconfig/configs'
 local util = require 'lspconfig/util'
 
+-- common jsonnet library paths
+local function jsonnet_path(root_dir)
+  local paths = {
+    util.path.join(root_dir, 'lib'),
+    util.path.join(root_dir, 'vendor'),
+  }
+  return table.concat(paths, ':')
+end
+
 configs.jsonnet_ls = {
   default_config = {
     cmd = { 'jsonnet-language-server' },
@@ -8,6 +17,11 @@ configs.jsonnet_ls = {
     root_dir = function(fname)
       return util.root_pattern 'jsonnetfile.json'(fname) or util.find_git_ancestor(fname)
     end,
+    on_new_config = function(new_config, root_dir)
+      new_config.cmd_env = {
+        JSONNET_PATH = jsonnet_path(root_dir),
+      }
+    end,
   },
   docs = {
     description = [[