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ebb8326 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 | """Jinja2-based prompt template loading utilities."""
from functools import lru_cache
from pathlib import Path
from jinja2 import Environment, FileSystemLoader, select_autoescape
_TEMPLATES_DIR = Path(__file__).parent.parent / "templates"
@lru_cache(maxsize=1)
def _get_jinja_env() -> Environment:
"""Get cached Jinja2 environment with template directory."""
return Environment(
loader=FileSystemLoader(_TEMPLATES_DIR),
autoescape=select_autoescape(default=False),
trim_blocks=True,
lstrip_blocks=True,
)
def load_prompt(template_name: str, block_name: str, **kwargs) -> str:
"""Load and render a Jinja2 prompt template block.
Args:
template_name: Template file name (e.g., 'router.j2')
block_name: Block name within template ('system' or 'user')
**kwargs: Variables to render in the template
Returns:
Rendered prompt string
"""
env = _get_jinja_env()
template = env.get_template(template_name)
# Render the specific block
block = template.blocks.get(block_name)
if block is None:
raise ValueError(f"Block '{block_name}' not found in template '{template_name}'")
ctx = template.new_context(kwargs)
return "".join(block(ctx)).strip()
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