commit c546c50bd6ca044e8847e58a96e788f92fecc5a4
Author: Softonik <softonik@ro.ru>
Date:   Thu May 27 18:34:02 2021 +0300

    Init

diff --git a/.run.tests b/.run.tests
new file mode 100644
index 0000000..e69de29
diff --git a/Magefile.go b/Magefile.go
new file mode 100644
index 0000000..3ac8cb9
--- /dev/null
+++ b/Magefile.go
@@ -0,0 +1,70 @@
+// +build mage
+
+package main
+
+import (
+
+	// mage:import
+	. "magefile/docker"
+
+	"github.com/magefile/mage/mg"
+)
+
+var (
+	GolangVolume = "golang.upstream"
+)
+
+func init() {
+	AppName = "goconf"
+	ImageName = "my/go"
+	NetName = "none"
+}
+
+func ModTidy() {
+	Bash(`sudo docker run -ti --rm \
+		-h host \
+		--net=bridge \
+		-v /etc/localtime:/etc/localtime:ro \
+		-v ` + GolangVolume + `:/usr/local/go:ro \
+		\
+		-v /d1/d/gopath/_data:/gopath:rw \
+		-v ${PWD}:/app \
+		\
+		-e GOPATH=/gopath \
+		-e HOME=/home/user \
+		\
+		-w /app \
+		-u 1000 \
+		\
+		--entrypoint=/usr/local/go/bin/go \
+		\
+		\
+		` + ImageName + " " +
+		`mod tidy`)
+}
+
+func Test() {
+	mg.Deps(TestLib)
+}
+func TestLib() {
+	Bash(`sudo docker run -ti --rm \
+		-h host \
+		--net=none \
+		-v /etc/localtime:/etc/localtime:ro \
+		-v ` + GolangVolume + `:/usr/local/go:ro \
+		\
+		-v /d1/d/gopath/_data:/gopath:rw \
+		-v ${PWD}:/app \
+		\
+		-e GOPATH=/gopath \
+		-e HOME=/home/user \
+		\
+		-w /app \
+		-u 1000 \
+		\
+		--entrypoint=/usr/local/go/bin/go \
+		\
+		\
+		` + ImageName + " " +
+		`test -gcflags=-l`)
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..a7d4d1c
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,9 @@
+module my/goconf
+
+go 1.16
+
+require (
+	github.com/magefile/mage v1.11.0
+	github.com/onsi/ginkgo v1.16.2
+	github.com/onsi/gomega v1.13.0
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..679e899
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,95 @@
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diff --git a/goconf.go b/goconf.go
new file mode 100644
index 0000000..9f6f860
--- /dev/null
+++ b/goconf.go
@@ -0,0 +1,156 @@
+// Во имя Бога Милостивого, Милосердного!!!
+package goconf
+
+import (
+	"errors"
+	"go/ast"
+	"go/parser"
+	"go/token"
+	"reflect"
+	"strconv"
+)
+
+type ConfigParser struct {
+	config   interface{}
+	filename string
+}
+
+func LoadConfig(config interface{}, config_go string) error {
+	p := &ConfigParser{config: config, filename: config_go}
+	return p.parse()
+}
+
+func (c *ConfigParser) parse() error {
+	fset := token.NewFileSet()
+	af, err := parser.ParseFile(fset, c.filename, nil, parser.ParseComments)
+	if err != nil {
+		return err
+	}
+
+	return c.parseAST(af)
+}
+
+func (c *ConfigParser) parseAST(af *ast.File) error {
+	ast.Inspect(af, c.searchForConfigAndShouldContinue)
+	return nil
+}
+func (c *ConfigParser) searchForConfigAndShouldContinue(n ast.Node) bool {
+	vs, ok := n.(*ast.ValueSpec)
+	if ok && vs.Names[0].Name == "config" {
+		c.digConfig(vs)
+		return false
+	}
+	return true
+}
+
+func (c *ConfigParser) digConfig(config ast.Node) error {
+	ast.Inspect(config, c.searchForConfigElementsAndShouldContinue)
+	return nil
+}
+func (c *ConfigParser) searchForConfigElementsAndShouldContinue(n ast.Node) bool {
+	definition, ok := n.(*ast.CompositeLit)
+	if ok {
+		t, ok := definition.Type.(*ast.Ident)
+		if ok && t.Name == "Config" {
+			c.digConfigElements(definition.Elts)
+			return false
+		}
+	}
+	return true
+}
+
+func (c *ConfigParser) digConfigElements(elements []ast.Expr) error {
+	for _, e := range elements {
+		c.digConfigElement(e)
+	}
+	return nil
+}
+func (c *ConfigParser) digConfigElement(e ast.Expr) error {
+	keyvalue, ok := e.(*ast.KeyValueExpr)
+	if !ok {
+		return errors.New("Not ast.KeyValueExpr")
+	}
+
+	key, ok := keyvalue.Key.(*ast.Ident)
+	if !ok {
+		return errors.New("Key not found")
+	}
+
+	value, ok := keyvalue.Value.(*ast.BasicLit)
+	if !ok {
+		return errors.New("Value not found")
+	}
+
+	return c.setConfigElement(key.Name, value)
+}
+
+func (c *ConfigParser) setConfigElement(key string, value *ast.BasicLit) error {
+	config := reflect.ValueOf(c.config)
+
+	kind := config.Kind()
+	if config.IsNil() || kind != reflect.Ptr {
+		return errors.New("Bad config pointer")
+	}
+
+	config = config.Elem()
+	kind = config.Kind()
+	if kind != reflect.Struct {
+		return errors.New("Config is not a struct")
+	}
+
+	vt := config.Type()
+	numFields := config.NumField()
+	for i := 0; i < numFields; i++ {
+		c.setConfigElementField(key, value, config, i, vt)
+	}
+
+	return nil
+}
+func (c *ConfigParser) setConfigElementField(key string, value *ast.BasicLit, config reflect.Value, i int, vt reflect.Type) error {
+	if vt.Field(i).Name != key {
+		return nil
+	}
+
+	vf := config.Field(i)
+	uv := unpackValue(vf)
+	kind := uv.Kind()
+
+	switch kind {
+	case reflect.String:
+		c.setConfigFieldToString(uv, value)
+	case reflect.Int:
+		c.setConfigFieldToInt(uv, value)
+	}
+	return nil
+}
+
+func unpackValue(v reflect.Value) reflect.Value {
+	if v.Kind() == reflect.Interface && !v.IsNil() {
+		v = v.Elem()
+	}
+	return v
+}
+
+func (c *ConfigParser) setConfigFieldToString(uv reflect.Value, value *ast.BasicLit) error {
+	if value.Kind != token.STRING {
+		return errors.New("Not string")
+	}
+	s, err := strconv.Unquote(value.Value)
+	if err != nil {
+		return err
+	}
+	uv.SetString(s)
+	return nil
+}
+
+func (c *ConfigParser) setConfigFieldToInt(uv reflect.Value, value *ast.BasicLit) error {
+	if value.Kind != token.INT {
+		return errors.New("Not int")
+	}
+	num, err := strconv.Atoi(value.Value)
+	if err != nil {
+		return err
+	}
+	uv.SetInt(int64(num))
+	return nil
+}
diff --git a/goconf_test.go b/goconf_test.go
new file mode 100644
index 0000000..ddddaba
--- /dev/null
+++ b/goconf_test.go
@@ -0,0 +1,47 @@
+// Во имя Бога Милостивого, Милосердного!!!
+package goconf
+
+import (
+	"testing"
+
+	. "github.com/onsi/ginkgo"
+	. "github.com/onsi/gomega"
+)
+
+var Be = Equal
+var NDescribe = func(string, func()) {}
+
+func TestUtils(t *testing.T) {
+	RegisterFailHandler(Fail)
+	RunSpecs(t, "Lib")
+}
+
+type Config struct {
+	Host     string
+	Port     int
+	Params   string
+	IntParam int
+}
+
+var config = Config{
+	Host: "testhost",
+	Port: 19,
+
+	Params:   "some params",
+	IntParam: 199,
+}
+
+var _ = Describe("Lib", func() {
+	Describe("Parse .go file into internal struct", func() {
+		c := &Config{}
+
+		It("", func() {
+			err := LoadConfig(c, "goconf_test.go")
+			Ω(err).NotTo(HaveOccurred())
+			Ω(c.Host).To(Be("testhost"))
+			Ω(c.Port).To(Be(19))
+			Ω(c.Params).To(Be("some params"))
+			Ω(c.IntParam).To(Be(199))
+		})
+	})
+})