new(nvim): add JETLS config

https://github.com/aviatesk/JETLS.jl

dotfiles/neovim/lua/lspconfig/server_configurations/jetls.lua

@@ -0,0 +1,36 @@
+local configs = require 'lspconfig.configs'
+local util = require 'lspconfig.util'
+
+local root_files = { 'Project.toml', 'JuliaProject.toml' }
+
+configs.jetls = {
+    default_config = {
+        cmd = {
+            'julia',
+            '--project=' .. vim.env.HOME .. '/work/julia/JETLS.jl',
+            '--startup-file=no',
+            '--history-file=no',
+            '-e',
+            [[
+                using JETLS
+                runserver(stdin, stdout)
+            ]]
+        },
+        filetypes = { 'julia' },
+        root_dir = function(fname)
+            return util.root_pattern(unpack(root_files))(fname)
+                or vim.fs.dirname(vim.fs.find('.git', { path = fname, upward = true, })[1])
+        end,
+        single_file_support = true,
+    },
+    commands = {
+        -- JuliaActivateEnv = {
+        --     activate_env
+        -- }
+    },
+    docs = {
+        description = [[
+JETLS: https://github.com/aviatesk/JETLS.jl
+        ]],
+    },
+}