erlang basedir(PathType, Application, Opts)用法及代碼示例

返回給定類型的一個或多個合適的路徑。如果Opts中未設置os，則該函數將默認為本機選項，即'linux'、'darwin'或'windows'，如os:type/0所理解的那樣。任何未識別為 'darwin' 或 'windows' 的內容都會被解釋為 'linux' 。

選項'author' 和'version' 僅與'windows' 選項模式一起使用。

• user_cache

  該路徑位置適用於本地計算機上的臨時數據文件。

  在 Linux 上：尊重操作係統環境變量 XDG_CACHE_HOME 。

  1> filename:basedir(user_cache, "my_application", #{os=>linux}).
  "/home/otptest/.cache/my_application"

  關於達爾文：

  1> filename:basedir(user_cache, "my_application", #{os=>darwin}).
  "/home/otptest/Library/Caches/my_application"

  在 Windows 上：

  1> filename:basedir(user_cache, "My App").
  "c:/Users/otptest/AppData/Local/My App/Cache"
  2> filename:basedir(user_cache, "My App").
  "c:/Users/otptest/AppData/Local/My App/Cache"
  3> filename:basedir(user_cache, "My App", #{author=>"Erlang"}).
  "c:/Users/otptest/AppData/Local/Erlang/My App/Cache"
  4> filename:basedir(user_cache, "My App", #{version=>"1.2"}).
  "c:/Users/otptest/AppData/Local/My App/1.2/Cache"
  5> filename:basedir(user_cache, "My App", #{author=>"Erlang",version=>"1.2"}).
  "c:/Users/otptest/AppData/Local/Erlang/My App/1.2/Cache"

• user_config

  該路徑位置用於持久配置文件。

  在 Linux 上：尊重操作係統環境變量 XDG_CONFIG_HOME 。

  2> filename:basedir(user_config, "my_application", #{os=>linux}).
  "/home/otptest/.config/my_application"

  關於達爾文：

  2> filename:basedir(user_config, "my_application", #{os=>darwin}).
  "/home/otptest/Library/Application Support/my_application"

  在 Windows 上：

  1> filename:basedir(user_config, "My App").
  "c:/Users/otptest/AppData/Roaming/My App"
  2> filename:basedir(user_config, "My App", #{author=>"Erlang", version=>"1.2"}).
  "c:/Users/otptest/AppData/Roaming/Erlang/My App/1.2"

• user_data

  該路徑位置用於持久數據文件。

  在 Linux 上：尊重操作係統環境變量 XDG_DATA_HOME 。

  3> filename:basedir(user_data, "my_application", #{os=>linux}).
  "/home/otptest/.local/my_application"

  關於達爾文：

  3> filename:basedir(user_data, "my_application", #{os=>darwin}).
  "/home/otptest/Library/Application Support/my_application"

  在 Windows 上：

  8> filename:basedir(user_data, "My App").
  "c:/Users/otptest/AppData/Local/My App"
  9> filename:basedir(user_data, "My App",#{author=>"Erlang",version=>"1.2"}).
  "c:/Users/otptest/AppData/Local/Erlang/My App/1.2"

• user_log

  該路徑位置適用於本地計算機上的臨時日誌文件。

  在 Linux 上：尊重操作係統環境變量 XDG_CACHE_HOME 。

  4> filename:basedir(user_log, "my_application", #{os=>linux}).
  "/home/otptest/.cache/my_application/log"

  關於達爾文：

  4> filename:basedir(user_log, "my_application", #{os=>darwin}).
  "/home/otptest/Library/Logs/my_application"

  在 Windows 上：

  12> filename:basedir(user_log, "My App").
  "c:/Users/otptest/AppData/Local/My App/Logs"
  13> filename:basedir(user_log, "My App",#{author=>"Erlang",version=>"1.2"}).
  "c:/Users/otptest/AppData/Local/Erlang/My App/1.2/Logs"

• site_config

  在 Linux 上：尊重操作係統環境變量 XDG_CONFIG_DIRS 。

  5> filename:basedir(site_config, "my_application", #{os=>linux}).
  ["/usr/local/share/my_application",
   "/usr/share/my_application"]
  6> os:getenv("XDG_CONFIG_DIRS").
  "/etc/xdg/xdg-ubuntu:/usr/share/upstart/xdg:/etc/xdg"
  7> filename:basedir(site_config, "my_application", #{os=>linux}).
  ["/etc/xdg/xdg-ubuntu/my_application",
   "/usr/share/upstart/xdg/my_application",
   "/etc/xdg/my_application"]
  8> os:unsetenv("XDG_CONFIG_DIRS").
  true
  9> filename:basedir(site_config, "my_application", #{os=>linux}).
  ["/etc/xdg/my_application"]

  關於達爾文：

  5> filename:basedir(site_config, "my_application", #{os=>darwin}).
  ["/Library/Application Support/my_application"]

• site_data

  在 Linux 上：尊重操作係統環境變量 XDG_DATA_DIRS 。

  10> os:getenv("XDG_DATA_DIRS").
  "/usr/share/ubuntu:/usr/share/gnome:/usr/local/share/:/usr/share/"
  11> filename:basedir(site_data, "my_application", #{os=>linux}).
  ["/usr/share/ubuntu/my_application",
   "/usr/share/gnome/my_application",
   "/usr/local/share/my_application",
   "/usr/share/my_application"]
  12> os:unsetenv("XDG_DATA_DIRS").
  true
  13> filename:basedir(site_data, "my_application", #{os=>linux}).
  ["/usr/local/share/my_application",
   "/usr/share/my_application"]

  關於達爾文：

  5> filename:basedir(site_data, "my_application", #{os=>darwin}).
  ["/Library/Application Support/my_application"]