Add pre-commit to the repo

This adds pre-commit which can be used to enforce consistent style
and common errors (like committing large files)

.drone.yml

@@ -13,6 +13,12 @@ steps:
     commands:
       - make test
 
+  - name: check
+    image: python:3
+    commands:
+      - pip install pre-commit==1.20.0
+      - make check
+
   - name: notify
     image: drillster/drone-email
     settings:

.pre-commit-config.yaml

@@ -0,0 +1,19 @@
+---
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v2.4.0
+    hooks:
+      - id: check-added-large-files
+      - id: check-yaml
+        args:
+          - --allow-multiple-documents
+      - id: trailing-whitespace
+      - id: end-of-file-fixer
+      - id: check-merge-conflict
+  - repo: git://github.com/dnephin/pre-commit-golang
+    rev: v0.3.5
+    hooks:
+      - id: go-fmt
+      - id: go-imports
+      # - id: gometalinter
+      # - id: golangci-lint

Makefile

@@ -29,6 +29,16 @@ test:
 	@go tool cover -func=coverage.out | awk -v target=80.0% \
 		'/^total:/ { print "Total coverage: " $$3 " Minimum coverage: " target; if ($$3+0.0 >= target+0.0) print "ok"; else { print "fail"; exit 1; } }'
 
+# Installs pre-commit hooks
+.PHONY: install-hooks
+install-hooks:
+	pre-commit install --install-hooks
+
+# Checks files for encryption
+.PHONY: check
+check:
+	pre-commit run --all-files
+
 .PHONY: clean
 clean:
 	rm -f ./minitor-go

config.go

@@ -2,10 +2,11 @@ package main
 
 import (
 	"errors"
-	"gopkg.in/yaml.v2"
 	"io/ioutil"
 	"log"
 	"os"
+
+	"gopkg.in/yaml.v2"
 )
 
 // Config type is contains all provided user configuration

metrics.go

@@ -2,10 +2,10 @@ package main
 
 import (
 	"fmt"
-	"github.com/prometheus/client_golang/prometheus"
-	// "github.com/prometheus/client_golang/prometheus/promauto"
-	"github.com/prometheus/client_golang/prometheus/promhttp"
 	"net/http"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
 )
 
 // TODO: Not sure if this is the best way to handle. A global instance for

test/invalid-config-missing-alerts.yml

@@ -6,4 +6,3 @@ monitors:
     alert_down: [ 'alert_down', 'log_shell', 'log_command' ]
     # alert_every: -1
     alert_every: 0
-