Add ocamlformat shim script to install correct version

Reviewed By: jvillard

Differential Revision: D9333255

fbshipit-source-id: 7b5de2d61

scripts/ocamlformat_shim.sh

@@ -0,0 +1,27 @@
+#!/bin/bash
+
+# Copyright (c) 2017-present, Facebook, Inc.
+#
+# This source code is licensed under the MIT license found in the
+# LICENSE file in the root directory of this source tree.
+
+# Run ocamlformat, installing the required version via opam if necessary.
+
+set -x
+set -e
+
+TARGET_VERSION=$(grep version .ocamlformat | cut -d ' ' -f 2)
+
+if [ -z $TARGET_VERSION ]
+then
+  echo "Could not find .ocamlformat file containing version"
+  exit 1
+fi
+
+if [ ! -x "$(command -v ocamlformat)" ] ||
+   [ "$TARGET_VERSION" != "$(ocamlformat --version)" ]
+then
+    opam install "ocamlformat.$TARGET_VERSION"
+fi
+
+ocamlformat "$@"