feat: integrate with lspconfig's on_setup hook (#631)

* feat: integrate with lspconfig's on_setup hook

* fix!: don't use aliased installation directories if new .setup() fn is used

This makes it so servers are always installed in a directory name that
corresponds with the server name. The reason aliased installation directories
is supported is lost on me, but it's legacy and complicates things
unnecessarily.

This is a breaking change for users who previously were using the `.on_server_ready()`
hook, and now transitioned to setting up servers directly via lspconfig.
These users will need to reinstall the server.

* fix: block usage of the deprecated server:setup() method if new setup method is used

* fix: allow passing no arg to setup()

* docs: ok final.v3 readme

1 files changed, 32 insertions, 0 deletions

diff --git a/lua/nvim-lsp-installer/middleware.lua b/lua/nvim-lsp-installer/middleware.lua
new file mode 100644
index 00000000..3e01b976
--- /dev/null
+++ b/lua/nvim-lsp-installer/middleware.lua
@@ -0,0 +1,32 @@
+local util = require "lspconfig.util"
+local servers = require "nvim-lsp-installer.servers"
+
+local M = {}
+
+---@param t1 table
+---@param t2 table
+local function merge_in_place(t1, t2)
+    for k, v in pairs(t2) do
+        if type(v) == "table" then
+            if type(t1[k]) == "table" and not vim.tbl_islist(t1[k]) then
+                merge_in_place(t1[k], v)
+            else
+                t1[k] = v
+            end
+        else
+            t1[k] = v
+        end
+    end
+    return t1
+end
+
+function M.register_lspconfig_hook()
+    util.on_setup = util.add_hook_before(util.on_setup, function(config)
+        local ok, server = servers.get_server(config.name)
+        if ok then
+            merge_in_place(config, server._default_options)
+        end
+    end)
+end
+
+return M