1 files changed, 88 insertions, 0 deletions
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..b41afa4
--- /dev/null
+++ b/main.go
@@ -0,0 +1,88 @@
+package main
+
+import (
+	"flag"
+	"os"
+	"strings"
+
+	"gopkg.in/yaml.v3"
+)
+
+var (
+	input         = stringsArray{}
+	output        = ""
+	indent        = 2
+	replaceArrays = false
+)
+
+func main() {
+	flag.Var(&input, "i", "input files")
+	flag.StringVar(&output, "o", "out.yaml", "output file")
+	flag.IntVar(&indent, "indent", 2, "changes the used indentation used when encoding")
+	flag.BoolVar(&replaceArrays, "replace_arrays", false, "replace arrays with same keys. Merge otherwise.")
+	flag.Parse()
+
+	result := map[string]any{}
+
+	for _, inputFile := range input {
+		b, err := os.ReadFile(inputFile)
+		if err != nil {
+			panic(err)
+		}
+		m := map[string]any{}
+		if err := yaml.Unmarshal(b, m); err != nil {
+			panic(err)
+		}
+		merge(result, m, replaceArrays)
+	}
+
+	fp, err := os.Create(output)
+	if err != nil {
+		panic(err)
+	}
+	defer fp.Close()
+
+	enc := yaml.NewEncoder(fp)
+	enc.SetIndent(indent)
+	if err := enc.Encode(result); err != nil {
+		panic(err)
+	}
+}
+
+func merge(target map[string]any, in map[string]any, replaceArrays bool) {
+	for k, v := range in {
+		old, exist := target[k]
+		if !exist {
+			target[k] = v
+			continue
+		}
+		switch old := old.(type) {
+		case map[string]any:
+			v, ok := v.(map[string]any)
+			if ok {
+				merge(old, v, replaceArrays)
+				target[k] = old
+				continue
+			}
+		case []any:
+			v, ok := v.([]any)
+			if ok && !replaceArrays {
+				old = append(old, v...)
+				target[k] = old
+				continue
+			}
+		}
+		target[k] = v
+	}
+}
+
+type stringsArray []string
+
+func (i *stringsArray) Set(value string) error {
+	*i = append(*i, value)
+	return nil
+}
+
+func (i *stringsArray) String() string {
+	return strings.Join(*i, ",")
+}