(#24) Filter of subject length

cmd/go-gitlint/main.go

@@ -47,10 +47,7 @@ func main() {
 }
 
 func configure() {
-	var args []string
-	if len(os.Args) > 1 {
-		args = append(args, os.Args[1:]...)
-	}
+	args := os.Args[1:]
 	const file = ".gitlint"
 	if _, err := os.Stat(file); err == nil {
 		config, err := kingpin.ExpandArgsFromFile(file)

internal/issues/filters.go

@@ -23,8 +23,9 @@ import (
 )
 
 var (
-	subjectRegex = kingpin.Flag("subject-regex", "Filters commit subjects based on a regular expression.").String()    //nolint[gochecknoglobals]
-	bodyRegex    = kingpin.Flag("body-regex", "Filters commit message bodies based on a regular expression.").String() //nolint[gochecknoglobals]
+	subjectRegex  = kingpin.Flag("subject-regex", "Filters commit subjects based on a regular expression.").String()    //nolint[gochecknoglobals]
+	subjectLength = kingpin.Flag("subject-len", "Filters commit subjects based on length.").Int()                       //nolint[gochecknoglobals]
+	bodyRegex     = kingpin.Flag("body-regex", "Filters commit message bodies based on a regular expression.").String() //nolint[gochecknoglobals]
 )
 
 // Filter identifies an issue with a commit.
@@ -41,6 +42,9 @@ func Filters() []Filter {
 	if bodyRegex != nil {
 		filters = append(filters, OfBodyRegex(*bodyRegex))
 	}
+	if subjectLength != nil && *subjectLength > 0 {
+		filters = append(filters, OfSubjectLength(*subjectLength))
+	}
 	return filters
 }
 
@@ -79,3 +83,17 @@ func OfBodyRegex(regex string) Filter {
 		return issue
 	}
 }
+
+// OfSubjectLength tests a commit subject's length.
+func OfSubjectLength(length int) Filter {
+	return func(c *commits.Commit) Issue {
+		var issue Issue
+		if len(c.Subject()) > length {
+			issue = Issue{
+				Desc:   fmt.Sprintf("subject is longer than %d", length),
+				Commit: *c,
+			}
+		}
+		return issue
+	}
+}

internal/issues/filters_test.go

@@ -72,3 +72,25 @@ func TestOfBodyRegexNonMatch(t *testing.T) {
 		"filter.OfBodyRegex() must not match if the commit's subject does not match the regex",
 	)
 }
+
+func TestOfSubjectLengthMatch(t *testing.T) {
+	assert.NotZero(t,
+		OfSubjectLength(5)(
+			&commits.Commit{
+				Message: "very very very VERY long subject\n\nand body",
+			},
+		),
+		"filter.OfSubjectLength() must match if the commit's subject is too long",
+	)
+}
+
+func TestOfSubjectLengthNonMatch(t *testing.T) {
+	assert.Zero(t,
+		OfSubjectLength(10)(
+			&commits.Commit{
+				Message: "short\n\nmessage",
+			},
+		),
+		"filter.OfSubjectLength() must not match if the commit's subject is not too long",
+	)
+}