commit fd22b325e5c1fd29f7d8e91a6b78be2cc482f0ef
Author: Alexander NeonXP Kiryukhin <i@neonxp.ru>
Date:   Sat May 4 20:11:36 2024 +0300

    Начальный коммит

diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..9f211b5
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,5 @@
+module go.neonxp.ru/merger
+
+go 1.22.2
+
+require gopkg.in/yaml.v3 v3.0.1
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..4bc0337
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,3 @@
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
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, ",")
+}
diff --git a/readme.md b/readme.md
new file mode 100644
index 0000000..09122e9
--- /dev/null
+++ b/readme.md
@@ -0,0 +1,78 @@
+# merger
+
+Простейший мерджер yaml'ов
+
+## Установка
+
+```
+go install go.neonxp.ru/merger@latest
+```
+
+## Использование
+
+```
+merger -i file1.yaml -i file2.yaml -i fileN.yaml -o output.yaml
+```
+
+Есть ещё ключи:
+
+- `-indent 2` устанавливает отступ в результирующем yaml'е
+- `-replace_arrays false` - если true то массивы по одинаковым ключам будут перезатираться. По умолчанию - соединяться.
+
+## Пример
+
+file1.yaml
+```yaml
+a1:
+  a11:
+    - one
+    - two
+  a12: "one"
+a2:
+  a21:
+    - one
+    - two
+  a22: "one"
+  a23:
+    a231: 231
+    a232: 232
+    a233: 233
+```
+
+file2.yaml
+```yaml
+a1:
+  a11:
+    - three
+    - four
+  a12: "two"
+a2:
+  a23:
+    a231: "!!!"
+    a232: "???"
+    a233:
+      sub: tree
+      to: merge
+```
+
+output.yaml
+```yaml
+a1:
+  a11:
+    - one
+    - two
+    - three
+    - four
+  a12: two
+a2:
+  a21:
+    - one
+    - two
+  a22: one
+  a23:
+    a231: '!!!'
+    a232: ???
+    a233:
+      sub: tree
+      to: merge
+```
\ No newline at end of file