add pre commit infrastructure (#4)

.pre-commit-config.yaml

@@ -0,0 +1,14 @@
+repos:
+  - repo: local
+    hooks:
+      - id: rustfmt
+        name: autoformat
+        entry: .pre-commit-hooks/rustfmt.sh
+        language: script
+        files: \.rs$
+
+      - id: clippy
+        name: clippy_linter
+        entry: .pre-commit-hooks/clippy.sh
+        language: script
+        files: \.rs$

.pre-commit-hooks/clippy.sh

@@ -0,0 +1,6 @@
+#!/bin/sh
+cargo clippy -- -Dwarnings 2> /dev/null
+clippy_exit_code=$?
+if [ $clippy_exit_code != 0 ]; then
+    echo -e "\e[31mYour code seems to contains style violations! Run cargo clippy before committing!\e[0m" ; exit 1
+fi

.pre-commit-hooks/rustfmt.sh

@@ -0,0 +1,7 @@
+#!/bin/sh
+STAGED=$(git diff --name-only --cached | grep '.*\.rs')
+if ! [ "$STAGED" = '' ]; then
+    rustfmt --check "$STAGED" || {
+        echo -e "\e[31mYour code is not formatted correctly! Please run rustfmt on all staged files before committing!\e[0m" ; exit 1
+    }
+fi