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""" Functions for working with Makefiles
"""
from pathlib import Path
def parse_rules_mk_file(file, rules_mk=None):
"""Turn a rules.mk file into a dictionary.
Args:
file: path to the rules.mk file
rules_mk: already parsed rules.mk the new file should be merged with
Returns:
a dictionary with the file's content
"""
if not rules_mk:
rules_mk = {}
file = Path(file)
if file.exists():
rules_mk_lines = file.read_text(encoding='utf-8').split("\n")
for line in rules_mk_lines:
# Filter out comments
if line.strip().startswith("#"):
continue
# Strip in-line comments
if '#' in line:
line = line[:line.index('#')].strip()
if '=' in line:
# Append
if '+=' in line:
key, value = line.split('+=', 1)
if key.strip() not in rules_mk:
rules_mk[key.strip()] = value.strip()
else:
rules_mk[key.strip()] += ' ' + value.strip()
# Set if absent
elif "?=" in line:
key, value = line.split('?=', 1)
if key.strip() not in rules_mk:
rules_mk[key.strip()] = value.strip()
else:
if ":=" in line:
line.replace(":", "")
key, value = line.split('=', 1)
rules_mk[key.strip()] = value.strip()
return rules_mk
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