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feat: advertise constraints in setup.py #24

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69 changes: 55 additions & 14 deletions setup.py
Original file line number Diff line number Diff line change
Expand Up @@ -2,35 +2,76 @@
# pylint: disable=C0111,W6005,W6100

import os
import re
import sys

from setuptools import setup


def load_requirements(*requirements_paths):
"""
Load all requirements from the specified requirements files.

Requirements will include any constraints from files specified
with -c in the requirements files.
Returns a list of requirement strings.
"""
requirements = set()
# UPDATED VIA SEMGREP - if you need to remove/modify this method remove this line and add a comment specifying why.

requirements = {}
constraint_files = set()

# groups "my-package-name<=x.y.z,..." into ("my-package-name", "<=x.y.z,...")
requirement_line_regex = re.compile(r"([a-zA-Z0-9-_.]+)([<>=][^#\s]+)?")

def add_version_constraint_or_raise(current_line, current_requirements, add_if_not_present):
regex_match = requirement_line_regex.match(current_line)
if regex_match:
package = regex_match.group(1)
version_constraints = regex_match.group(2)
existing_version_constraints = current_requirements.get(package, None)
# it's fine to add constraints to an unconstrained package, but raise an error if there are already
# constraints in place
if existing_version_constraints and existing_version_constraints != version_constraints:
raise BaseException(f'Multiple constraint definitions found for {package}:'
f' "{existing_version_constraints}" and "{version_constraints}".'
f'Combine constraints into one location with {package}'
f'{existing_version_constraints},{version_constraints}.')
if add_if_not_present or package in current_requirements:
current_requirements[package] = version_constraints

# process .in files and store the path to any constraint files that are pulled in
for path in requirements_paths:
requirements.update(
line.split('#')[0].strip() for line in open(path)
if is_requirement(line.strip())
)
return list(requirements)
with open(path) as reqs:
for line in reqs:
if is_requirement(line):
add_version_constraint_or_raise(line, requirements, True)
if line and line.startswith('-c') and not line.startswith('-c http'):
constraint_files.add(os.path.dirname(path) + '/' + line.split('#')[0].replace('-c', '').strip())

# process constraint files and add any new constraints found to existing requirements
for constraint_file in constraint_files:
with open(constraint_file) as reader:
for line in reader:
if is_requirement(line):
add_version_constraint_or_raise(line, requirements, False)

# process back into list of pkg><=constraints strings
constrained_requirements = [f'{pkg}{version or ""}' for (pkg, version) in sorted(requirements.items())]
return constrained_requirements


def is_requirement(line):
"""
Return True if the requirement line is a package requirement;
that is, it is not blank, a comment, a URL, or an included file.
Return True if the requirement line is a package requirement.

Returns:
bool: True if the line is not blank, a comment,
a URL, or an included file
"""
return not (
line == '' or
line.startswith('-r') or
line.startswith('#') or
line.startswith('-e') or
line.startswith('git+')
# UPDATED VIA SEMGREP - if you need to remove/modify this method remove this line and add a comment specifying why

return line and line.strip() and not line.startswith(('-r', '#', '-e', 'git+', '-c'))
)


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