fix: fix win32 detection (#33)

* Introduce a util function to check for win32 in vim.fn correctly
* Replace all checks for win32 with the new function

lua/codeium/api.lua

@@ -4,6 +4,7 @@ local io = require("codeium.io")
 local log = require("codeium.log")
 local update = require("codeium.update")
 local notify = require("codeium.notify")
+local util = require("codeium.util")
 local api_key = nil
 
 local function find_port(manager_dir, start_time)
@@ -178,7 +179,7 @@ function Server:new()
 		local manager_dir = config.manager_path
 		if not manager_dir then
 			manager_dir = io.tempdir("codeium/manager")
-			if vim.fn.has("win32") == 1 then
+			if util.has_win32() then
 				vim.fn.mkdir(manager_dir, "p")
 			end
 		end

lua/codeium/io.lua

@@ -4,6 +4,7 @@ local Path = require("plenary.path")
 local Job = require("plenary.job")
 local curl = require("plenary.curl")
 local config = require("codeium.config")
+local util = require("codeium.util")
 local default_mod = 438 -- 666
 
 local M = {}
@@ -204,7 +205,7 @@ function M.get_system_info()
 		return system_info_cache
 	end
 
-	if vim.fn.has("win32") == 1 then
+	if util.has_win32() then
 		system_info_cache = {
 			os = "windows",
 			arch = "x86_64",
@@ -300,7 +301,7 @@ end
 
 function M.generate_uuid()
 	local uuid
-	if vim.fn.has("win32") then
+	if util.has_win32() then
 		uuid = string.gsub("xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx", "[xy]", function(c)
 			return string.format("%x", (c == "x") and (math.random(16) - 1) or (((math.random(16) - 1) % 4) + 8))
 		end)
@@ -318,7 +319,7 @@ function M.generate_uuid()
 end
 
 function M.gunzip(path, callback)
-	if vim.fn.has("win32") then
+	if util.has_win32() then
 		M.job({
 			"powershell.exe",
 			"-noprofile",

lua/codeium/util.lua

@@ -38,4 +38,8 @@ function M.get_newline(bufnr)
 	return enums.line_endings[vim.api.nvim_buf_get_option(bufnr, "fileformat")] or "\n"
 end
 
+function M.has_win32()
+  return vim.call("exists", "*win32") == 1
+end
+
 return M