Wrap sh_binary in macro

BUILD.bazel

@@ -1,6 +1 @@
-sh_binary(
-    name = "qac_compile_commands",
-    srcs = ["qac_compile_commands.sh"],
-    args = ["$(location //:refresh_compile_commands)"],
-    data = ["//:refresh_compile_commands"],
-)
+exports_files(["qac_compile_commands.sh"])

qac_compile_commands.bzl

@@ -0,0 +1,19 @@
+def qac_compile_commands(name, tool, **kwargs):
+    """Replaces -isystem with -I in a compile_commands.json file.
+
+    This is necessary to get Helix QAC to work correctly.
+
+    Args:
+        name: A unique label for this rule.
+        tool: A label refrencing a @hedron_compile_commands:refresh_compile_commands target.
+
+    """
+    arg = "$(location {})".format(tool)
+    native.sh_binary(
+        name = name,
+        # FIXME: Assumes //bazel is a valid label in the consuming workspace.
+        srcs = ["//bazel:qac_compile_commands.sh"],
+        args = [arg],
+        data = [tool],
+        **kwargs
+    )