添加路径到Erlang搜索路径？ [英] Add Path to Erlang Search Path?

问题描述

我最近安装了Erlang RFC4627（JSON-RPC）和debian软件包。我运行测试服务器：

  sudo erl -pa ebin 
  

然后在提示符下：

  test_jsonrpc：start_httpd 。 
  

返回

  ok 
  

我用http：//：5671进行了测试，并获得了成功的消息。

然而，当我尝试运行rabbitmq-http2时，我发现自述文件所说的错误是由rfc4627的代码不在erlang搜索路径上引起的。我该怎么把它放在路上我在Dave Thomas博客上看到一些建议将路径放在文件中的东西：

 〜/ .erlang 
  

这似乎不适合我（也许我做错了？）。

解决方案

代码模块您是如何操纵应用程序中的路径。

您在启动Erlang shell时使用的标志-pa实际上是指该模块中的一个功能：

  add_patha（Dir） - >真| {错误，什么} 
  

您的主目录中的.erlang文件正确 - 正在运行在shell的启动时间，您可以添加方便的路径。

对于一个应用程序，您可以使用一个批处理文件来启动shell，如下所示： / p>

  erl -pa ./ebin ../../lib/some/path/ebin 
  

描述了erl的标志行为这里。

对于更复杂的路径管理，您需要熟悉如何 OTP发布管理已完成（但我怀疑你还有一段时间）。

I recently installed Erlang RFC4627 (JSON-RPC) with the debian package. I ran the test server using:

sudo erl -pa ebin

and then at the prompt:

test_jsonrpc:start_httpd().

returned

ok

I tested with http://:5671/ and got the success messages.

When I try to run rabbitmq-http2 however, I get the errors that the readme says are caused by rfc4627's code not being on the erlang search path. How do I put it on the path. I saw something on Dave Thomas's blog which suggested putting the path in the file:

~/.erlang

This didn't seem to work for me (maybe I did it wrong?).

解决方案

The code module is how you manipulate the path within an application.

The flags -pa that you used in starting the Erlang shell actually refer to a function in this module:

add_patha(Dir) -> true | {error, What}

You are right about the .erlang file in your home directory - it is run at start-up time of the shell and you can add in handy paths.

For an application you can start the shell with a batch file that calls something like this:

erl -pa ./ebin ../../lib/some/path/ebin

The flags behaviour of erl is described here.

For more sophisticated path management you need to get familiar with how OTP release management is done (but I suspect that is a while away for you yet).

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