[Perf] wrap platform utils and refactor the logic to get default (#126)

save_path

lua/codesnap/static.lua

@@ -1,15 +1,4 @@
 local path_utils = require("codesnap.utils.path")
--- Get user os
--- If linux, use XDG_PICTURE_DIR, if mac use ~/Pictures, if windows use FOLDERID_Pictures (If support is added back)
-local default_save_path = nil
-local os_name = vim.loop.os_uname().sysname
-if os_name == "Linux" then
-  default_save_path = os.getenv("XDG_PICTURES_DIR") or (os.getenv("HOME") .. "/Pictures")
-elseif os_name == "Darwin" then
-  default_save_path = os.getenv("HOME") .. "/Pictures"
-else
-  error("codesnap.nvim only supports Linux and MacOS")
-end
 
 return {
   config = {
@@ -26,7 +15,7 @@ return {
     min_width = 0,
     bg_x_padding = 122,
     bg_y_padding = 82,
-    save_path = default_save_path,
+    save_path = path_utils.get_default_save_path(),
   },
   cwd = path_utils.back(path_utils.back(debug.getinfo(1, "S").source:sub(2):match("(.*[/\\])"))),
   preview_switch = true,

lua/codesnap/utils/path.lua

@@ -1,4 +1,5 @@
 local string_utils = require("codesnap.utils.string")
+local platform_utils = require("codesnap.utils.platform")
 local path_utils = {}
 
 function path_utils.get_escaped_cwd()
@@ -26,4 +27,21 @@ function path_utils.get_relative_path()
   return full_file_path:gsub(path_utils.get_escaped_cwd(), ""):sub(2)
 end
 
+-- Get default save path by OS
+-- If Linux, use XDG_PICTURE_DIR
+-- if mac use ~/Pictures
+-- if windows use FOLDERID_Pictures (If support is added back)
+function path_utils.get_default_save_path()
+  local home_picture_folder = os.getenv("HOME") .. "/Pictures"
+
+  return platform_utils.match_os({
+    Darwin = function()
+      return home_picture_folder
+    end,
+    Linux = function()
+      return os.getenv("XDG_PICTURES_DIR") or home_picture_folder
+    end,
+  })
+end
+
 return path_utils

lua/codesnap/utils/platform.lua

@@ -0,0 +1,15 @@
+local platform_utils = {}
+
+local current_os_name = vim.loop.os_uname().sysname
+
+function platform_utils.match_os(matches_table)
+  local fn = matches_table[current_os_name]
+
+  if fn == nil then
+    error("codesnap.nvim not supported on " .. current_os_name)
+  end
+
+  return fn()
+end
+
+return platform_utils