Add elixir bindings

bindings/elixir/.clang-format

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+src/.clang-format

bindings/elixir/.formatter.exs

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+# Used by "mix format"
+[
+  inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
+]

bindings/elixir/.gitignore

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+# The directory Mix will write compiled artifacts to.
+/_build/
+
+# If you run "mix test --cover", coverage assets end up here.
+/cover/
+
+# The directory Mix downloads your dependencies sources to.
+/deps/
+
+# Where third-party dependencies like ExDoc output generated docs.
+/doc/
+
+# If the VM crashes, it generates a dump, let's ignore it too.
+erl_crash.dump
+
+# Also ignore archive artifacts (built via "mix archive.build").
+*.ez
+
+# Ignore package tarball (built via "mix hex.build").
+ckzg-*.tar
+
+# Temporary files, for example, from tests.
+/tmp/
+
+.cache/
+priv/build.txt
+priv/ckzg_nif.so
+.clangd
+compile_commands.json

bindings/elixir/Makefile

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+CC = clang
+PRIV_DIR = $(MIX_APP_PATH)/priv
+NIF_SO = $(PRIV_DIR)/ckzg_nif.so
+SRC_ROOT = $(shell pwd)
+C_SRC = $(SRC_ROOT)/native/src
+
+CFLAGS += -Wall -Wextra -shared -std=c11 -fPIC -I"$(ERTS_INCLUDE_DIR)"
+UNAME_S := $(shell uname -s)
+ifndef TARGET_ABI
+ifeq ($(UNAME_S),Darwin)
+	TARGET_ABI = darwin
+endif
+endif
+
+ifeq ($(TARGET_ABI),darwin)
+	CFLAGS += -undefined dynamic_lookup -flat_namespace -undefined suppress
+endif
+
+ifeq ($(OS),Windows_NT)
+	ifneq (,$(findstring Git/,$(SHELL)))
+		BLST_BUILDSCRIPT = ./build.bat
+	else
+		BLST_BUILDSCRIPT = .\build.bat
+	endif
+	BLST_OBJ = blst.lib
+	LOCATION ?= win-x64
+	EXTENSION ?= ".dll"
+	CKZG_LIBRARY_PATH = $(PRIV_DIR)/ckzg_nif$(EXTENSION)
+
+else
+	BLST_BUILDSCRIPT = ./build.sh
+	BLST_OBJ = libblst.a
+	CFLAGS += -fPIC
+
+	UNAME_S := $(shell uname -s)
+	UNAME_M := $(shell uname -m)
+	ifeq ($(UNAME_S),Linux)
+		EXTENSION ?= ".so"
+		ifeq ($(UNAME_M),x86_64)
+			LOCATION ?= linux-x64
+		else
+			LOCATION ?= linux-arm64
+		endif
+	endif
+	ifeq ($(UNAME_S),Darwin)
+		EXTENSION ?= ".dylib"
+		ifeq ($(UNAME_M),arm64)
+			LOCATION ?= osx-arm64
+		else
+			LOCATION ?= osx-x64
+		endif
+	endif
+
+	CKZG_LIBRARY_PATH = $(PRIV_DIR)/ckzg_nif$(EXTENSION)
+endif
+
+INCLUDE_DIRS = ../../src ../../blst/bindings $(ERTS_INCLUDE_DIR)
+TARGETS = $(C_SRC)/ckzg_wrap.c ../../src/ckzg.c ../../blst/$(BLST_OBJ)
+
+CFLAGS += ${addprefix -I,${INCLUDE_DIRS}}
+BLST_BUILDSCRIPT_FLAGS += -D__BLST_PORTABLE__
+ifdef ARCH
+	CFLAGS += --target=$(ARCH)
+	BLST_BUILDSCRIPT_FLAGS += --target=$(ARCH)
+endif
+
+ifdef DEBUG
+	CFLAGS += -g
+else
+	CFLAGS += -O2
+endif
+
+.PHONY: all
+all: blst ckzg
+
+.PHONY: blst
+blst:
+	cd ../../blst && $(BLST_BUILDSCRIPT) $(BLST_BUILDSCRIPT_FLAGS)
+
+.PHONY: ckzg
+ckzg: blst
+	$(CC) $(CFLAGS) -o $(CKZG_LIBRARY_PATH) $(TARGETS)
+	@echo "$(CC_PRECOMPILER_CURRENT_TARGET)" > "$(PRIV_DIR)/build.txt"

bindings/elixir/README.md

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+# KZG
+
+**TODO: Add description**
+
+## Installation
+
+If [available in Hex](https://hex.pm/docs/publish), the package can be installed
+by adding `ckzg` to your list of dependencies in `mix.exs`:
+
+```elixir
+def deps do
+  [
+    {:ckzg, "~> 0.1.0"}
+  ]
+end
+```
+
+Documentation can be generated with [ExDoc](https://github.com/elixir-lang/ex_doc)
+and published on [HexDocs](https://hexdocs.pm). Once published, the docs can
+be found at <https://hexdocs.pm/kzg>.