refactor: auto-generate language configuration (#1584)

Refactor the monolithic `lvim.lang` design into a more modular approach.

IMPORTANT: run `:LvimUpdate` in order to generate the new ftplugin template files.

1 files changed, 82 insertions, 0 deletions

diff --git a/lua/lsp/manager.lua b/lua/lsp/manager.lua
new file mode 100644
index 00000000..24d462ad
--- /dev/null
+++ b/lua/lsp/manager.lua
@@ -0,0 +1,82 @@
+local M = {}
+
+local Log = require "core.log"
+local lsp_utils = require "lsp.utils"
+
+function M.init_defaults(languages)
+  for _, entry in ipairs(languages) do
+    if not lvim.lang[entry] then
+      lvim.lang[entry] = {
+        formatters = {},
+        linters = {},
+      }
+    end
+  end
+end
+
+local function is_overridden(server)
+  local overrides = lvim.lsp.override
+  if type(overrides) == "table" then
+    if vim.tbl_contains(overrides, server) then
+      return
+    end
+  end
+end
+
+function M.setup_server(server_name)
+  vim.validate {
+    name = { server_name, "string" },
+  }
+
+  if lsp_utils.is_client_active(server_name) or is_overridden(server_name) then
+    return
+  end
+
+  local lsp_installer_servers = require "nvim-lsp-installer.servers"
+  local server_available, requested_server = lsp_installer_servers.get_server(server_name)
+  if server_available then
+    if not requested_server:is_installed() then
+      Log:debug(string.format("[%s] is not installed", server_name))
+      if lvim.lsp.automatic_servers_installation then
+        Log:debug(string.format("Installing [%s]", server_name))
+        requested_server:install()
+      else
+        return
+      end
+    end
+  end
+
+  local default_config = {
+    on_attach = require("lsp").common_on_attach,
+    on_init = require("lsp").common_on_init,
+    capabilities = require("lsp").common_capabilities(),
+  }
+
+  local status_ok, custom_config = pcall(require, "lsp/providers/" .. requested_server.name)
+  if status_ok then
+    local new_config = vim.tbl_deep_extend("force", default_config, custom_config)
+    Log:debug("Using custom configuration for requested server: " .. requested_server.name)
+    requested_server:setup(new_config)
+  else
+    Log:debug("Using the default configuration for requested server: " .. requested_server.name)
+    requested_server:setup(default_config)
+  end
+end
+
+function M.setup(servers)
+  local status_ok, _ = pcall(require, "nvim-lsp-installer")
+  if not status_ok then
+    return
+  end
+
+  --- allow using a single value
+  if type(servers) == "string" then
+    servers = { servers }
+  end
+
+  for _, server in ipairs(servers) do
+    M.setup_server(server)
+  end
+end
+
+return M