little refactoring

cmd/config.go

@@ -135,8 +135,9 @@ func InitConfig(output io.Writer) (*Config, error) {
 	if conf.Examples {
 		_, err := fmt.Fprintln(output, Examples)
 		if err != nil {
-			Die(err)
+			Die("failed write to output file handle", err)
 		}
+
 		os.Exit(0)
 	}
 

cmd/root.go

@@ -18,12 +18,13 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
 package cmd
 
 import (
+	"fmt"
 	"io"
-	"log"
+	"os"
 )
 
-func Die(err error) int {
+func Die(format string, err error) int {
-	log.Fatal("Error: ", err.Error())
+	fmt.Fprintf(os.Stderr, format+": %s\n", err)
 
 	return 1
 }
@@ -31,13 +32,14 @@ func Die(err error) int {
 func Main(output io.Writer) int {
 	conf, err := InitConfig(output)
 	if err != nil {
-		return Die(err)
+		fmt.Println(1)
+		return Die("failed to initialize", err)
 	}
 
 	tp := NewTP(conf)
 
 	if err := tp.ProcessTimestamps(); err != nil {
-		return Die(err)
+		return Die("failed to process timestamp[s]", err)
 	}
 
 	return 0

cmd/times.go

@@ -20,7 +20,6 @@ package cmd
 import (
 	"errors"
 	"fmt"
-	"log"
 	"regexp"
 	"strconv"
 	"time"
@@ -60,23 +59,12 @@ func (tp *TimestampProccessor) ProcessTimestamps() error {
 	case 1:
 		return tp.SingleTimestamp(tp.Args[0])
 	case 2:
-		return tp.Calc(tp.Args[0], tp.Args[1])
+		return tp.DualTimestamps(tp.Args[0], tp.Args[1])
 	}
 
 	return nil
 }
 
-func (tp *TimestampProccessor) SingleTimestamp(timestamp string) error {
-	ts, err := tp.Parse(timestamp)
-	if err != nil {
-		return err
-	}
-
-	tp.Print(ts)
-
-	return nil
-}
-
 // Parse uses 3 different timestamp parser modules to provide maximum flexibility
 func (tp *TimestampProccessor) Parse(timestamp string) (time.Time, error) {
 	ts, err := anytime.Parse(timestamp, tp.Reference)
@@ -94,7 +82,18 @@ func (tp *TimestampProccessor) Parse(timestamp string) (time.Time, error) {
 	return dateparse.ParseAny(timestamp)
 }
 
-func (tp *TimestampProccessor) Calc(timestampA, timestampB string) error {
+func (tp *TimestampProccessor) SingleTimestamp(timestamp string) error {
+	ts, err := tp.Parse(timestamp)
+	if err != nil {
+		return err
+	}
+
+	tp.Print(ts)
+
+	return nil
+}
+
+func (tp *TimestampProccessor) DualTimestamps(timestampA, timestampB string) error {
 	tsA, err := tp.Parse(timestampA)
 	if err != nil {
 		return err
@@ -112,6 +111,12 @@ func (tp *TimestampProccessor) Calc(timestampA, timestampB string) error {
 		return err
 	}
 
+	tp.CalcDiff(tsA, tsB)
+
+	return nil
+}
+
+func (tp *TimestampProccessor) CalcDiff(tsA time.Time, tsB time.Time) {
 	switch tp.Mode {
 	case ModeDiff:
 		var diff time.Duration
@@ -131,8 +136,6 @@ func (tp *TimestampProccessor) Calc(timestampA, timestampB string) error {
 
 		tp.Print(TPdatetime{TimestampProccessor: *tp, Data: sum})
 	}
-
-	return nil
 }
 
 func (tp *TimestampProccessor) CalcDuration(tsA time.Time, durB time.Duration) {
@@ -151,7 +154,7 @@ func (tp *TimestampProccessor) CalcDuration(tsA time.Time, durB time.Duration) {
 func (tp *TimestampProccessor) Print(ts TimestampWriter) {
 	_, err := fmt.Fprintln(tp.Output, ts.String())
 	if err != nil {
-		log.Fatalf("failed to print to given output handle: %s", err)
+		Die("failed to print to given output handle", err)
 	}
 }