perf: host pre-compiled filetype mappings (#555)

Generating the filetype mappings by accessing `vim.lsp.config` turns out to be a bad idea because:
1) performance
2) some `lsp/` configurations in nvim-lspconfig execute code immediately (see angularls)
3) accessing `vim.lsp.config[server_name]` seems to populate `:checkhealth vim.lsp`

1 files changed, 40 insertions, 0 deletions

diff --git a/scripts/lua/mason-scripts/utils.lua b/scripts/lua/mason-scripts/utils.lua
new file mode 100644
index 0000000..ee6ab10
--- /dev/null
+++ b/scripts/lua/mason-scripts/utils.lua
@@ -0,0 +1,40 @@
+local _ = require "mason-core.functional"
+local fs = require "mason-core.fs"
+
+local M = {}
+
+---@async
+---@param path string
+---@param contents string
+---@param flags string?
+function M.write_file(path, contents, flags)
+    local header = _.cond({
+        {
+            _.matches "%.lua$",
+            _.always {
+                "-- THIS FILE IS GENERATED. DO NOT EDIT MANUALLY.",
+                "-- stylua: ignore start",
+            },
+        },
+        {
+            _.matches "%.md$",
+            _.always {
+                "<!--- THIS FILE IS GENERATED. DO NOT EDIT MANUALLY. -->",
+            },
+        },
+        {
+            _.matches "doc/.+%.txt$",
+            _.always {},
+        },
+        {
+            _.T,
+            _.always {
+                "# THIS FILE IS GENERATED. DO NOT EDIT MANUALLY.",
+            },
+        },
+    }, path)
+
+    fs.async.write_file(path, table.concat(_.concat(header, { contents }), "\n"), flags)
+end
+
+return M