Fix metalinter

internal/engine.go

@@ -4,14 +4,17 @@ import (
 	"strings"
 )
 
+// Engine is internal component for searching files and grep their contents
 type Engine struct {
 	grepper *_Grepper
 }
 
+// NewEngine creates a new Engine.
 func NewEngine() *Engine {
 	return &Engine{newGrepper()}
 }
 
+// Query will search files, grep contents, and return matching results.
 func (e *Engine) Query(args ...string) []string {
 	var findArgs []string
 	var grepArgs []string

internal/finder.go

@@ -35,9 +35,8 @@ func newFinder(queries ...string) *_Finder {
 			if finder.shouldSkip(info.Name()) {
 				if info.IsDir() {
 					return filepath.SkipDir
-				} else {
-					return nil
 				}
+				return nil
 			}
 
 			if info.IsDir() {

internal/grepper.go

@@ -21,11 +21,15 @@ func (g *_Grepper) grep(file string, keywords ...string) (bool, error) {
 		return false, err
 	}
 
-	defer func() { _ = f.Close() }()
+	defer func() {
+		if err := f.Close(); err != nil {
+			panic(err)
+		}
+	}()
 
 	scanner := bufio.NewScanner(f)
 	for scanner.Scan() {
-		for keyword, _ := range keywordMap {
+		for keyword := range keywordMap {
 			if bytes.Contains(scanner.Bytes(), []byte(keyword)) {
 				delete(keywordMap, keyword)
 			}

internal/matcher.go

@@ -16,19 +16,18 @@ type _StringMatcher struct {
 func newMatcher(pattern string) (_Matcher, error) {
 	if len(pattern) > 2 && strings.HasPrefix(pattern, "/") && strings.HasSuffix(pattern, "/") {
 		return newRegexpMatcher(pattern)
-	} else {
-		return newStringMatcher(pattern), nil
 	}
+	return newStringMatcher(pattern), nil
 }
 
 func newStringMatcher(pattern string) _StringMatcher {
 	return _StringMatcher{strings.ToLower(pattern)}
 }
 
 func (m _StringMatcher) Matches(input string) bool {
-	lower_input := strings.ToLower(input)
+	lower := strings.ToLower(input)
 
-	return strings.Contains(lower_input, m.pattern)
+	return strings.Contains(lower, m.pattern)
 }
 
 type _RegexpMatcher struct {