Pre commit script to auto rustfmt (#1602)

* test pre-commit

* remove pre-commit

* first step

* script to install precommit

* use bash

.pre-commit-config.yaml

@@ -0,0 +1,4 @@
+-   repo: https://github.com/doublify/pre-commit-rust
+    rev: master
+    hooks:
+    -   id: fmt

scripts/install_precommit.sh

@@ -0,0 +1,19 @@
+#!/bin/bash
+
+echo "Copying rustfmt.toml into ~/.config/rustfmt/"
+mkdir -p "${HOME}"/.config/rustfmt
+cp $(dirname "${0}")/../rustfmt.toml "${HOME}"/.config/rustfmt/
+
+if [[ ! -f "${HOME}/.local/bin/pre-commit" ]]; then
+    echo "installing pre-commit program"
+    if [[ ! -z "$(command -v pip3)" ]]; then
+        pip3 install pre-commit
+    elif [[ ! -z "$(command -v pip)" ]]; then
+        pip install pre-commit
+    else
+        echo "Please install pip3 or pip and rerun this script"
+        exit 1
+    fi
+fi
+
+"${HOME}"/.local/bin/pre-commit install