Initial checkin of Pika from heckimp

.clang-format

@@ -0,0 +1,46 @@
+# For more information, see:
+#
+#   https://clang.llvm.org/docs/ClangFormat.html
+#   https://clang.llvm.org/docs/ClangFormatStyleOptions.html
+#
+---
+
+BasedOnStyle: GNU
+
+AlignAfterOpenBracket: Align
+AlignArrayOfStructures: Left
+AlignConsecutiveAssignments: Consecutive
+AlignConsecutiveDeclarations: Consecutive
+AlignConsecutiveMacros: Consecutive
+AlignEscapedNewlines: Left
+
+AllowAllParametersOfDeclarationOnNextLine: false
+AlwaysBreakAfterReturnType: AllDefinitions
+BinPackParameters: false
+BreakBeforeBraces: GNU
+IndentWidth: 2
+PointerAlignment: Right
+UseTab: Never
+
+SpaceBeforeParens: Always
+SpaceAfterLogicalNot: true
+SpaceAfterCStyleCast: true
+
+# Our column limit is more around 80 characters but we want to avoid
+# this rule to be over-agressive. So for clang-format, let's use a
+# higher limit. Then let's put some biggish penalties on breaking on
+# assignment, or parentheses, or other similar cases. Actually with such
+# limits, if clang-format really ends up re-formatting, there might be
+# something better to do code-wise (i.e. we might be in an akwardly
+# over-nested block case).
+ColumnLimit: 80
+PenaltyBreakAssignment: 60
+PenaltyBreakBeforeFirstCallParameter: 100
+PenaltyBreakString: 60
+# Uncomment this when we start using clang-format 14 in the CI.
+# PenaltyBreakOpenParenthesis: 40
+PenaltyExcessCharacter: 1
+# Strings are more often longer by usage, so let's give these slightly
+# more space to breath.
+PenaltyBreakString: 60
+PenaltyReturnTypeOnItsOwnLine: 50