从Jinja呈现的模板中删除不必要的空白 [英] Remove unnecessary whitespace from Jinja rendered template

问题描述

我正在使用 curl 来观看我的网络应用的输出。当Flask和Jinja渲染模板时，输出中会有很多不必要的空白。它似乎是通过从Flask-WTF和Flask-Bootstrap渲染各种组件来添加的。我可以用 sed 来解决这个问题，但是有没有办法从Jinja中控制这个？

解决方案< Jinja有多种方式来控制空格。它不能有一种方法来美化输出，你必须手动确保一切看起来很好。

最广泛的解决方案是设置 trim_blocks 和 lstrip_blocks 上的env。

  app.jinja_env.trim_blocks = True 
 app.jinja_env.lstrip_blocks = True 
  

如果要在文件末尾保留换行符，请设置 strip_trailing_newlines = False 。

您可以使用控制字符来修改块周围空白的工作方式。 - 总是删除空格， + 始终保留，覆盖该块的env设置。字符可以在块的开始或结尾（或两个）去控制空白方向。

 <在
 {％if ... +％}之前保留
 {％ -  if ...％％}之前保留并剥离之后保留
 
记住`{％endif％}`被分开处理
  

请注意，控制字符只适用于模板你写。如果您包含模板或使用来自第三方的宏，那么他们写的模板将适用于该部分。

I'm using curl to watch the output of my web app. When Flask and Jinja render templates, there's a lot of unnecessary white space in the output. It seems to be added by rendering various components from Flask-WTF and Flask-Bootstrap. I could strip this using sed, but is there a way to control this from Jinja?

解决方案

Jinja has multiple ways to control whitespace. It does not have a way to prettify output, you have to manually make sure everything looks "nice".

The broadest solution is to set trim_blocks and lstrip_blocks on the env.

app.jinja_env.trim_blocks = True
app.jinja_env.lstrip_blocks = True

If you want to keep a newline at the end of the file, set strip_trailing_newlines = False.

You can use control characters to modify how the whitespace around a block works. - always removes whitespace, + always preserves it, overriding the env settings for that block. The character can go at the beginning or end (or both) of a block to control the whitespace in that direction.

{%- if ... %} strips before
{% if ... +%} preserves after
{%+ if ... -%} preserves before and strips after
remember that `{% endif %}` is treated separately

Note that the control characters only apply to templates you write. If you include a template or use a macro from a 3rd party, however they wrote the template will apply to that part.

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