feat(julials): add JuliaActivateEnv to activate a julia environment

lua/lspconfig/server_configurations/julials.lua

@@ -1,5 +1,51 @@
 local util = require 'lspconfig.util'
 
+local function activate_env(path)
+  local bufnr = vim.api.nvim_get_current_buf()
+  local julials_client = util.get_active_client_by_name(bufnr, 'julials')
+  if not julials_client then
+    vim.notify(
+      'method julia/activateenvironment is not supported by any servers active on the current buffer',
+      vim.log.levels.WARN
+    )
+    return
+  end
+  local julia_project_files = { 'Project.toml', 'JuliaProject.toml' }
+  local function _activate_env(environment)
+    if environment then
+      julials_client.notify('julia/activateenvironment', { envPath = environment })
+      vim.notify('Julia environment activated: \n`' .. environment .. '`', vim.log.levels.INFO)
+    end
+  end
+  if path then
+    path = vim.fs.normalize(path)
+    local found_env = false
+    for _, project_file in ipairs(julia_project_files) do
+      if util.path.exists(util.path.join(path, project_file)) then
+        found_env = true
+        break
+      end
+    end
+    if not found_env then
+      vim.notify('Path is not a julia environment: \n`' .. path .. '`', vim.log.levels.WARN)
+      return
+    end
+    _activate_env(path)
+  else
+    local depot_envs = vim.fs.normalize(vim.env.JULIA_DEPOT_PATH or vim.fn.expand '~/.julia') .. '/environments'
+    local environments = {}
+    vim.list_extend(environments, vim.fs.find(julia_project_files, { type = 'file', upward = true, limit = math.huge }))
+    vim.list_extend(
+      environments,
+      vim.fs.find(function(name, env_path)
+        return vim.tbl_contains(julia_project_files, name) and string.sub(env_path, #depot_envs + 1):match '^/[^/]*$'
+      end, { path = depot_envs, type = 'file', limit = math.huge })
+    )
+    environments = vim.tbl_map(util.path.dirname, environments)
+    vim.ui.select(environments, { prompt = 'Select a Julia environment' }, _activate_env)
+  end
+end
+
 local cmd = {
   'julia',
   '--startup-file=no',
@@ -49,6 +95,14 @@ return {
     end,
     single_file_support = true,
   },
+  commands = {
+    JuliaActivateEnv = {
+      activate_env,
+      description = 'Activate a Julia environment',
+      nargs = '?',
+      complete = 'file',
+    },
+  },
   docs = {
     description = [[
 https://github.com/julia-vscode/julia-vscode