don't use die() anymore, butt dtd go errros

lib/helpers.go

@@ -20,17 +20,11 @@ package lib
 import (
 	"errors"
 	"fmt"
-	"os"
 	"regexp"
 	"strconv"
 	"strings"
 )
 
-func die(v ...interface{}) {
-	fmt.Fprintln(os.Stderr, v...)
-	os.Exit(1)
-}
-
 func contains(s []int, e int) bool {
 	for _, a := range s {
 		if a == e {

lib/io.go

@@ -31,7 +31,11 @@ func ProcessFiles(args []string) error {
 	}
 
 	for _, fd := range fds {
-		printData(parseFile(fd, pattern))
+		data, err := parseFile(fd, pattern)
+		if err != nil {
+			return err
+		}
+		printData(data)
 	}
 
 	return nil

lib/parser.go

@@ -19,6 +19,7 @@ package lib
 
 import (
 	"bufio"
+	"errors"
 	"fmt"
 	"github.com/alecthomas/repr"
 	"io"
@@ -43,7 +44,7 @@ type Tabdata struct {
    way we can turn "tabular data" (with fields containing whitespaces)
    into real tabular data. We re-tabulate our input if you will.
 */
-func parseFile(input io.Reader, pattern string) Tabdata {
+func parseFile(input io.Reader, pattern string) (Tabdata, error) {
 	data := Tabdata{}
 
 	var scanner *bufio.Scanner
@@ -65,7 +66,7 @@ func parseFile(input io.Reader, pattern string) Tabdata {
 
 		patternR, err := regexp.Compile(pattern)
 		if err != nil {
-			die(err)
+			return data, errors.Unwrap(fmt.Errorf("Regexp pattern %s is invalid: %w", pattern, err))
 		}
 
 		if !hadFirst {
@@ -145,20 +146,17 @@ func parseFile(input io.Reader, pattern string) Tabdata {
 
 				idx++
 			}
-			if Debug {
-				fmt.Println()
-			}
 			data.entries = append(data.entries, values)
 		}
 	}
 
 	if scanner.Err() != nil {
-		die(scanner.Err())
+		return data, errors.Unwrap(fmt.Errorf("Regexp pattern %s is invalid: %w", pattern, scanner.Err()))
 	}
 
 	if Debug {
 		repr.Print(data)
 	}
 
-	return data
+	return data, nil
 }

lib/parser_test.go

@@ -70,7 +70,12 @@ asd    igig   cxxxncnc
 19191  EDD 1  X`
 
 	readFd := strings.NewReader(table)
-	gotdata := parseFile(readFd, "")
+	gotdata, err := parseFile(readFd, "")
+
+	if err != nil {
+		t.Errorf("Parser returned error: %s\nData processed so far: %+v", err, gotdata)
+	}
+
 	if !reflect.DeepEqual(data, gotdata) {
 		t.Errorf("Parser returned invalid data\nExp: %+v\nGot: %+v\n", data, gotdata)
 	}

lib/printer_test.go

@@ -54,7 +54,12 @@ asd   	igig  	cxxxncnc
 	for mode, expect := range expects {
 		OutputMode = mode
 		fd := strings.NewReader(table)
-		data := parseFile(fd, "")
+		data, err := parseFile(fd, "")
+
+		if err != nil {
+			t.Errorf("Parser returned error: %s\nData processed so far: %+v", err, data)
+		}
+
 		printData(data)
 
 		buf := make([]byte, 1024)