Merge branch 'bye-first'

* bye-first:
  ChangeLog: Remove "first" dependency
  Remove dependency on "first"

ChangeLog.rst

@@ -6,6 +6,7 @@ Unreleased
   required only by unsafe packages
 - Fix constraint handling: Do not add new dependencies from constraints
 - compile-in: Rename "--no-trusted-host" to "--no-emit-trusted-host"
+- Remove dependency on the "first" Python package
 
 0.300.0
 -------

prequ/resolver.py

@@ -8,13 +8,12 @@
 from itertools import chain, count
 
 import click
-from first import first
 from pip.req import InstallRequirement
 
 from .cache import DependencyCache
 from .exceptions import UnsupportedConstraint
 from .logging import log
-from .utils import (format_requirement, format_specifier, full_groupby,
+from .utils import (first, format_requirement, format_specifier, full_groupby,
                     get_pinned_version,
                     is_pinned_requirement, key_from_req, is_vcs_link,
                     UNSAFE_PACKAGES)
@@ -156,7 +155,8 @@ def _group_constraints(self, constraints):
         """
         for _, ireqs in full_groupby(constraints, key=_dep_key):
             ireqs = list(ireqs)
-            exception_ireq = first(ireqs, key=lambda ireq: ireq.editable or is_vcs_link(ireq))
+            exception_ireq = first(
+                x for x in ireqs if x.editable or is_vcs_link(x))
             if exception_ireq:
                 yield exception_ireq  # ignore all the other specs: the editable/vcs one is the one that counts
                 continue

prequ/utils.py

@@ -9,11 +9,15 @@
 from click import style
 from pip.req import InstallRequirement
 
-from first import first
-
 from .exceptions import ImpossibleConstraint
 
 
+def first(iterable):
+    for x in iterable:
+        return x
+    return None
+
+
 def safeint(s):
     try:
         return int(s)

setup.cfg

@@ -29,7 +29,6 @@ include_package_data = True
 packages = find:
 install_requires =
     click>=6
-    first
     six
 zip_safe = False