从命令行向ERB传递绑定或参数

I have been playing around with erb from the command line recently. I wanted to make a dirt simple erb template, for example the following:

最近我一直在用命令行中的erb。我想做一个非常简单的erb模板，例如:

<%- name = "Joe"; quality = "fantastic" -%>
Hello. My name is <%= name %>. I hope your day is <%= quality %>.

This works if I run

如果我跑的话，这个是有效的

erb -T - thatfile.erb

what I want to do is to make name and quality be passable from command line arguments, so that I could do something like:

我想要做的是使名称和质量能够通过命令行参数，这样我就可以做如下的事情:

./thatfile.erb "Bill" "super"

from the bash prompt and do the same thing.

从bash提示符执行相同的操作。

I am aware that I could write a ruby script that would just read that template in and then use ERB.new(File.read("thatfile.erb")).result(binding), or writing the template after an END and doing likewise, but I'm looking for a more lightweight approach if it exists, because I don't want to write two files for each erb script that I create for this purpose.

我知道我可以写一个ruby脚本,就会读到模板,然后使用ERB.new(以(“thatfile.erb”)).result(绑定),结束后或写作模板,做同样的事情,但是我寻找一个更轻量级的方法如果它存在,因为我不想写每个erb脚本,我创建了两个文件。

4 个解决方案

#1

If you are using unix, try following:

如果您正在使用unix，请尝试以下操作:

$ cat 1.erb
Hello. My name is <%= name %>. I hope your day is <%= quality %>.
$ (echo '<% name="Joe"; quality="fantastic" %>' && cat 1.erb) | erb

Hello. My name is Joe. I hope your day is fantastic.

#2

Alternatively, you can use a ruby script and load it in as a library.

或者，您可以使用ruby脚本并将其作为库加载。

# vars.rb
@hello = 'kirk'

# template.html.erb
<div><%= @hello %></div>

$ erb -r './vars' template.html.erb

#3

I went with the BASH command-line shortcut for environmental variables.

我使用BASH命令行快捷方式处理环境变量。

Outside:

外:

STUFF=foo,bar erb input.html.erb >output.html

Inside:

内部:

<%
   stuff = ENV['STUFF'].split(',')
%>

After a few minutes e-searching I determined the other solutions are all variations on "write the erb wrapper command yourself." Could be wrong, but I ain't going back.

经过几分钟的电子搜索，我确定其他的解决方案都是“编写erb包装器命令自己”的变体。可能是错的，但我不会回去。

#4

Please note that Ruby 2.2 and newer provide a much nicer solution that was implemented according to this:

请注意，Ruby 2.2和更新版本提供了一个更好的解决方案，它是根据以下内容实现的:

erb var1=val1 var2=val2 my-template.erb

#1