Delete all parellagram files from tmp on closing

Add signal listener that catches the SIGINT signal, and deletes the
contents of the tmp/parellagram directory.

main.go

@@ -5,8 +5,10 @@ import (
 	"log"
 	"net/http"
 	"os"
+	"os/signal"
 	"path"
 	"strings"
+	"syscall"
 
 	fswatch "github.com/andreaskoch/go-fswatch"
 )
@@ -36,6 +38,16 @@ func buildWebsitePages(conf Config) {
 }
 
 func main() {
+	sigs := make(chan os.Signal, 1)
+	signal.Notify(sigs, syscall.SIGINT)
+
+	go func() {
+		_ = <-sigs
+		log.Println("Cleaning up...")
+		deleteTempDirectory()
+		os.Exit(0)
+	}()
+
 	conf := getConfig()
 	buildWebsitePages(conf)
 

utils.go

@@ -8,7 +8,13 @@ import (
 func clearTempDirectory(conf Config) {
 	p := path.Join(os.TempDir(), "parellagram")
 	clearDirContents(p)
-	os.Mkdir(path.Join(p, conf.Resources.Posts), os.ModeTemporary)
+	os.Mkdir(path.Join(p, conf.Resources.Posts), os.ModeDir|os.ModeTemporary)
+}
+
+func deleteTempDirectory() {
+	p := path.Join(os.TempDir(), "parellagram")
+	clearDirContents(p)
+	os.Remove(p)
 }
 
 func getDirContents(dirpath string) ([]string, error) {