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import functools
import os
from pathlib import Path
@functools.lru_cache(maxsize=16)
def which(binary_name: str) -> Path:
"""
Given a name of an executable, search $PATH and return
the absolute path of that executable. The results of this function
are LRU cached.
If not found, throws an RuntimeError.
"""
possible_directories = os.get_exec_path()
for dr in possible_directories:
p = Path(dr, binary_name)
if p.exists():
return p.absolute()
raise RuntimeError(f"Executable {binary_name} was not found in $PATH")
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