build script: support case insensitive target names

build.py

@@ -24,6 +24,7 @@ if sys.hexversion < 0x3070000:
     print('Build module requires Python 3.7 or newer')
     exit(1)
 
+import collections
 import argparse
 import re
 import os
@@ -419,6 +420,78 @@ class DevilutionXTarget(CMakeTarget):
         opts['CMAKE_EXE_LINKER_FLAGS'] += extra_linker_args
 
 
+# Case insensitive dictionary class from
+# from https://github.com/psf/requests/blob/v2.25.0/requests/structures.py
+
+class CaseInsensitiveDict(collections.abc.MutableMapping):
+    """A case-insensitive ``dict``-like object.
+    Implements all methods and operations of
+    ``MutableMapping`` as well as dict's ``copy``. Also
+    provides ``lower_items``.
+    All keys are expected to be strings. The structure remembers the
+    case of the last key to be set, and ``iter(instance)``,
+    ``keys()``, ``items()``, ``iterkeys()``, and ``iteritems()``
+    will contain case-sensitive keys. However, querying and contains
+    testing is case insensitive::
+        cid = CaseInsensitiveDict()
+        cid['Accept'] = 'application/json'
+        cid['aCCEPT'] == 'application/json'  # True
+        list(cid) == ['Accept']  # True
+    For example, ``headers['content-encoding']`` will return the
+    value of a ``'Content-Encoding'`` response header, regardless
+    of how the header name was originally stored.
+    If the constructor, ``.update``, or equality comparison
+    operations are given keys that have equal ``.lower()``s, the
+    behavior is undefined.
+    """
+
+    def __init__(self, data=None, **kwargs):
+        self._store = collections.OrderedDict()
+        if data is None:
+            data = {}
+        self.update(data, **kwargs)
+
+    def __setitem__(self, key, value):
+        # Use the lowercased key for lookups, but store the actual
+        # key alongside the value.
+        self._store[key.lower()] = (key, value)
+
+    def __getitem__(self, key):
+        return self._store[key.lower()][1]
+
+    def __delitem__(self, key):
+        del self._store[key.lower()]
+
+    def __iter__(self):
+        return (casedkey for casedkey, mappedvalue in self._store.values())
+
+    def __len__(self):
+        return len(self._store)
+
+    def lower_items(self):
+        """Like iteritems(), but with all lowercase keys."""
+        return (
+            (lowerkey, keyval[1])
+            for (lowerkey, keyval)
+            in self._store.items()
+        )
+
+    def __eq__(self, other):
+        if isinstance(other, collections.abc.Mapping):
+            other = CaseInsensitiveDict(other)
+        else:
+            return NotImplemented
+        # Compare insensitively
+        return dict(self.lower_items()) == dict(other.lower_items())
+
+    # Copy is required
+    def copy(self):
+        return CaseInsensitiveDict(self._store.values())
+
+    def __repr__(self):
+        return str(dict(self.items()))
+
+
 class Builder(object):
     def __init__(self, args: list):
         self._create_targets()
@@ -527,7 +600,7 @@ class Builder(object):
             DevilutionXTarget(),
         )
 
-        self.targets = {target.name: target for target in targets}
+        self.targets = CaseInsensitiveDict({target.name: target for target in targets})
 
     def _parse_arguments(self, args: list):
         assert self.targets