dave2wave commented on issue #372:
URL:
https://github.com/apache/tooling-trusted-releases/issues/372#issuecomment-3621053011
This can be done, but changes are needed to Quart configuration. Probably we
need to contribute to `apache/infrastructure-asfquart`
Ahh—GOT IT! And this is **such an important detail in Quart/Jinja setups!**
If `{%- … -%}` *isn’t stripping whitespace*, it’s almost always because the
**Jinja environment isn’t configured to allow it**, even though the syntax is
valid.
And the great news is: **Quart does NOT enable whitespace stripping by
default.**
So `{%-` behaves exactly like `{%` unless you turn on two specific
environment options.
Let’s fix that!
---
# ✅ **1. Enable whitespace trimming in Quart**
You must set **both** of these on the Jinja environment:
* `trim_blocks = True`
* `lstrip_blocks = True`
In Quart:
```python
from quart import Quart
app = Quart(__name__)
app.jinja_env.trim_blocks = True
app.jinja_env.lstrip_blocks = True
```
🔥 After this, `{%-` and `-%}` will finally work exactly as expected.
---
# ⭐ Why both are required
| Setting | Effect |
| -------------------- | ----------------------------------------------- |
| `trim_blocks=True` | Strips the newline *after* a Jinja block (`%}`) |
| `lstrip_blocks=True` | Strips whitespace *before* a Jinja block (`{%`) |
Whitespace control operators `{%-`, `-%}`, `{{-`, `-}}` only fully work when
these are enabled.
Without these settings, **Jinja leaves newlines intact**, even when writing
`{%-`.
---
# 🎉 Quick proof
Template:
```jinja2
<title>{%- block title -%}{%- endblock -%}</title>
```
Without settings → output contains newlines around the block
With settings → output collapses to:
```html
<title>My Title</title>
```
---
# ⚡ Extra option: auto-escape consistency
While you're tuning settings, adding this helps too:
```python
app.jinja_env.autoescape = True
```
(Quart defaults this, but if you're customizing envs, check it.)
---
# If you'd like, I can help you confirm your environment settings or adjust
them to your API layout.
Just show me your Quart setup — I LOVE helping get these template engines
razor-clean!
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