diff --git a/config/go.mod b/config/go.mod
new file mode 100644
index 0000000..d08f1ae
--- /dev/null
+++ b/config/go.mod
@@ -0,0 +1,5 @@
+module gitea.meta-tech.academy/go/core/config
+
+go 1.20
+
+require gopkg.in/yaml.v3 v3.0.1
diff --git a/config/go.sum b/config/go.sum
new file mode 100644
index 0000000..a62c313
--- /dev/null
+++ b/config/go.sum
@@ -0,0 +1,4 @@
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+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/config/loader.go b/config/loader.go
new file mode 100644
index 0000000..d8af616
--- /dev/null
+++ b/config/loader.go
@@ -0,0 +1,110 @@
+package config
+
+import (
+	"os"
+	"reflect"
+	"regexp"
+	"strings"
+
+	"gopkg.in/yaml.v3"
+)
+
+type Cfg interface {
+	GetVar() []VarConfig
+}
+
+type VarConfig struct {
+	Name  string `yaml:"name"`
+	Value string `yaml:"value"`
+}
+
+type ConfigLoader struct {
+	Var    []VarConfig
+	Config interface{}
+	varDef *VarPattern
+	refstr []*reflect.Value
+}
+
+func LoadConfig(path string, out Cfg, varPattern *VarPattern) {
+	cl := &ConfigLoader{varDef: varPattern, refstr: []*reflect.Value{}}
+	data, err := os.ReadFile(path)
+	if err != nil {
+		panic(err)
+	}
+	if err = yaml.Unmarshal(data, out); err != nil {
+		panic(err)
+	}
+	cl.Var = out.GetVar()
+	cl.Config = out
+	cl.parse()
+	cl.refstr = []*reflect.Value{}
+	// cl.setConfigPtr(outi)
+}
+
+func (cl *ConfigLoader) findVarName(match string) string {
+	re := regexp.MustCompile(cl.varDef.getPatternCaptureName())
+	parts := re.FindStringSubmatch(match)
+	if len(parts) > 0 {
+		match = parts[1]
+	}
+	return match
+}
+
+func (cl *ConfigLoader) findVarValue(v string) string {
+	names := strings.SplitN(v, ".", 2)
+	if names[0] == "var" {
+		for _, varConfig := range cl.Var {
+			if varConfig.Name == names[1] {
+				v = varConfig.Value
+			}
+		}
+	}
+	return v
+}
+
+func (cl *ConfigLoader) findStringRef(ref reflect.Value) {
+	switch ref.Kind() {
+	case reflect.Ptr, reflect.Interface:
+		cl.findStringRef(ref.Elem())
+	case reflect.Struct:
+		for i := 0; i < ref.NumField(); i++ {
+			refc := ref.Field(i)
+			cl.findStringRef(refc)
+		}
+	case reflect.Slice:
+		if !ref.IsNil() {
+			for i := 0; i < ref.Len(); i++ {
+				refc := ref.Index(i)
+				cl.findStringRef(refc)
+			}
+		}
+	case reflect.String:
+		if ref.Len() > 0 {
+			cl.refstr = append(cl.refstr, &ref)
+		}
+	}
+}
+
+func (cl *ConfigLoader) parse() {
+	var name string
+	var tmp string
+	var parts []string
+	var re2 *regexp.Regexp
+
+	cl.findStringRef(reflect.ValueOf(&cl))
+
+	re := regexp.MustCompile(cl.varDef.getPatternVar())
+	for _, ref := range cl.refstr {
+		tmp = ref.String()
+		parts = re.FindStringSubmatch(tmp)
+		if len(parts) > 0 {
+			s := strings.SplitAfter(parts[1], cl.varDef.Close)
+			for _, part := range s {
+				name = cl.findVarName(part)
+				re2 = regexp.MustCompile(cl.varDef.getPatternVarName(name))
+				tmp = re2.ReplaceAllString(tmp, cl.findVarValue(name))
+			}
+			ref.SetString(tmp)
+		}
+	}
+}
diff --git a/config/varpattern.go b/config/varpattern.go
new file mode 100644
index 0000000..85e26d7
--- /dev/null
+++ b/config/varpattern.go
@@ -0,0 +1,31 @@
+package config
+
+import (
+	"fmt"
+	"regexp"
+)
+
+type VarPattern struct {
+	Open  string
+	Close string
+}
+
+func (vp *VarPattern) getPatternCaptureName() string {
+	return fmt.Sprintf("%s([^%s]+)%s", regexp.QuoteMeta(vp.Open), regexp.QuoteMeta(string(vp.Close[:1])), regexp.QuoteMeta((vp.Close)))
+}
+
+func (vp *VarPattern) getPatternVar() string {
+	return fmt.Sprintf("(%s.+%s)", regexp.QuoteMeta(vp.Open), regexp.QuoteMeta(vp.Close))
+}
+
+func (vp *VarPattern) getPatternVarName(name string) string {
+	return fmt.Sprintf("%s%s%s", regexp.QuoteMeta(vp.Open), name, regexp.QuoteMeta(vp.Close))
+}
+
+func NewVarPattern(open string, close string) *VarPattern {
+	return &VarPattern{open, close}
+}
+
+func DefaultVarPattern() *VarPattern {
+	return NewVarPattern("{%", "%}")
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..443c0a2
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,3 @@
+module gitea.meta-tech.academy/go/core
+
+go 1.20
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..e69de29
diff --git a/go.work b/go.work
new file mode 100644
index 0000000..73678c0
--- /dev/null
+++ b/go.work
@@ -0,0 +1,8 @@
+go 1.20
+
+use (
+	./config
+	./style
+    ./util
+	./sys
+)
diff --git a/go.work.sum b/go.work.sum
new file mode 100644
index 0000000..6252bc4
--- /dev/null
+++ b/go.work.sum
@@ -0,0 +1,2 @@
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
diff --git a/style/go.mod b/style/go.mod
new file mode 100644
index 0000000..aabb955
--- /dev/null
+++ b/style/go.mod
@@ -0,0 +1,10 @@
+module gitea.meta-tech.academy/go/core/style
+
+go 1.20
+
+require github.com/gookit/color v1.5.4
+
+require (
+	github.com/xo/terminfo v0.0.0-20210125001918-ca9a967f8778 // indirect
+	golang.org/x/sys v0.10.0 // indirect
+)
diff --git a/style/go.sum b/style/go.sum
new file mode 100644
index 0000000..ce86143
--- /dev/null
+++ b/style/go.sum
@@ -0,0 +1,10 @@
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/gookit/color v1.5.4 h1:FZmqs7XOyGgCAxmWyPslpiok1k05wmY3SJTytgvYFs0=
+github.com/gookit/color v1.5.4/go.mod h1:pZJOeOS8DM43rXbp4AZo1n9zCU2qjpcRko0b6/QJi9w=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
+github.com/xo/terminfo v0.0.0-20210125001918-ca9a967f8778 h1:QldyIu/L63oPpyvQmHgvgickp1Yw510KJOqX7H24mg8=
+github.com/xo/terminfo v0.0.0-20210125001918-ca9a967f8778/go.mod h1:2MuV+tbUrU1zIOPMxZ5EncGwgmMJsa+9ucAQZXxsObs=
+golang.org/x/sys v0.10.0 h1:SqMFp9UcQJZa+pmYuAKjd9xq1f0j5rLcDIk0mj4qAsA=
+golang.org/x/sys v0.10.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
diff --git a/style/style.go b/style/style.go
new file mode 100644
index 0000000..7fce7cb
--- /dev/null
+++ b/style/style.go
@@ -0,0 +1,114 @@
+package style
+
+import (
+	"fmt"
+	"strings"
+        "gitea.meta-tech.academy/go/core/util"
+	"github.com/gookit/color"
+)
+
+// Hello returns a greeting for the named person.
+func Hello(name string) string {
+	// Return a greeting that embeds the name in a message.
+	message := fmt.Sprintf("Hi, %v. Welcome!", name)
+	return message
+}
+
+const KEY_STYLE_NAME = 0
+const KEY_STYLE_COLOR = 1
+const KEY_STYLE_OPTION = 2
+
+type Style struct {
+	color *color.RGBStyle
+	Name  string
+}
+
+type Styles struct {
+	List              map[string]*Style
+	DefaultKeyStyle   string
+	DefaultValStyle   string
+	DefaultKeyPadding string
+	DefaultIndent     string
+}
+
+func (s *Style) Printf(format string, a ...any) {
+	s.color.Printf(format, a...)
+}
+
+func (s *Style) Sprintf(format string, a ...any) string {
+	return s.color.Sprintf(format, a...)
+}
+
+func (s *Style) Echo(data string, format ...string) {
+	fmt := "%s"
+	if len(format) > 1 {
+		fmt = format[0]
+	}
+	s.Printf(fmt, data)
+}
+
+func (s *Style) Apply(data string, format ...string) string {
+	if len(format) > 1 {
+		return s.Sprintf(format[0], data)
+	} else {
+		return s.Sprintf(data)
+	}
+}
+
+func NewStyleByDef(def string) *Style {
+	var o []string = []string{}
+	d := strings.Fields(def)
+	c := strings.Split(d[KEY_STYLE_COLOR], ",")
+	if len(d) > KEY_STYLE_OPTION {
+		o = strings.Split(d[KEY_STYLE_OPTION], ",")
+	}
+	util.prependToSliceStr(&c, "#")
+	var s *color.RGBStyle
+	switch len(c) {
+	case 1:
+		s = color.HEXStyle(c[0])
+	case 2:
+		s = color.HEXStyle(c[0], c[1])
+	}
+	for _, elm := range o {
+		s.AddOpts(color.Color(util.str2int(elm, 10, 0)))
+	}
+	// s.Printf(" %-20s\n", d[KEY_STYLE_NAME])
+	return &Style{s, d[KEY_STYLE_NAME]}
+}
+
+func NewStyles() *Styles {
+	l := &Styles{
+		List:              make(map[string]*Style),
+		DefaultKeyStyle:   "key",
+		DefaultValStyle:   "val",
+		DefaultKeyPadding: "18",
+		DefaultIndent:     "4",
+	}
+	return l
+}
+
+func (s *Styles) Apply(name string, data string) string {
+	return s.List[name].Apply(data)
+}
+
+func (s *Styles) Echo(name string, data string) {
+	s.List[name].Echo(data)
+}
+
+func (s *Styles) Keyval(key string, val string, names ...string) {
+	sk := s.List[s.DefaultKeyStyle]
+	sv := s.List[s.DefaultValStyle]
+	if len(names) > 1 {
+		sk = s.List[names[0]]
+		if len(names) > 2 {
+			sv = s.List[names[1]]
+		}
+	}
+	fmt.Printf(
+		"%-"+s.DefaultIndent+"s%s : %s\n",
+		" ",
+		sk.Sprintf("%-"+s.DefaultKeyPadding+"s", key),
+		sv.Apply(val),
+	)
+}
diff --git a/sys/go.mod b/sys/go.mod
new file mode 100644
index 0000000..68324f2
--- /dev/null
+++ b/sys/go.mod
@@ -0,0 +1,5 @@
+module gitea.meta-tech.academy/go/core/sys
+
+go 1.20
+
+require golang.org/x/sys v0.13.0
diff --git a/sys/go.sum b/sys/go.sum
new file mode 100644
index 0000000..d4673ec
--- /dev/null
+++ b/sys/go.sum
@@ -0,0 +1,2 @@
+golang.org/x/sys v0.13.0 h1:Af8nKPmuFypiUBjVoU9V20FiaFXOcuZI21p0ycVYYGE=
+golang.org/x/sys v0.13.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
diff --git a/sys/sys.go b/sys/sys.go
new file mode 100644
index 0000000..666cca4
--- /dev/null
+++ b/sys/sys.go
@@ -0,0 +1,125 @@
+package sys
+
+import (
+	"fmt"
+	"io"
+	"os"
+	"os/exec"
+	"os/signal"
+	"syscall"
+
+	"golang.org/x/sys/unix"
+)
+
+var TERM_WIDTH = 0
+
+func RunCmd(cmd *exec.Cmd) int {
+	cmd.Stdin = os.Stdin
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	return ManageStatusCmd(cmd, cmd.Run())
+}
+
+func RunShellCmd(call string) int {
+	cmd := exec.Command("sh", "-c", call)
+	cmd.Stdin = os.Stdin
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	return ManageStatusCmd(cmd, cmd.Run())
+}
+
+func ManageStatusCmd(cmd *exec.Cmd, err error) int {
+	if err == nil {
+		return 0
+	}
+	// Figure out the exit code
+	if ws, ok := cmd.ProcessState.Sys().(syscall.WaitStatus); ok {
+		if ws.Exited() {
+			return ws.ExitStatus()
+		}
+		if ws.Signaled() {
+			return -int(ws.Signal())
+		}
+	}
+	return -1
+}
+
+func RunInteractiveCmd(cmd string, withStderr bool) int {
+	fmt.Printf(" == go before command : %s\n", cmd)
+	icmd := exec.Command("bash", "-c", cmd)
+	icmd.Stdin = os.Stdin
+	icmd.Stdout = os.Stdout
+	if withStderr {
+		icmd.Stderr = os.Stderr
+	}
+	return ManageStatusCmd(icmd, icmd.Run())
+}
+
+func PipeCmd(cmd1 *exec.Cmd, cmd2 *exec.Cmd, buffers ...io.Writer) {
+	fmt.Println("> Pipe Commands")
+	if len(buffers) > 0 {
+		pr, pw := io.Pipe()
+		cmd1.Stdout = pw
+		cmd2.Stdin = pr
+		cmd2.Stdout = buffers[0]
+		if len(buffers) > 1 {
+			cmd2.Stderr = buffers[1]
+		}
+
+		cmd1.Start()
+		cmd2.Start()
+
+		go func() {
+			defer pw.Close()
+			err1 := cmd1.Wait()
+			if err1 != nil {
+				fmt.Printf("error1 : %v\n", err1)
+			}
+		}()
+
+		err2 := cmd2.Wait()
+		if err2 != nil {
+			fmt.Printf("error2 : %v\n", err2)
+		}
+		fmt.Println("< Pipe Commands")
+	}
+}
+
+func UpdateTermSize() error {
+	ws, err := unix.IoctlGetWinsize(syscall.Stdout, unix.TIOCGWINSZ)
+	if err != nil {
+		return err
+	}
+	TERM_WIDTH = int(ws.Col)
+	return nil
+}
+
+func HandleTermChange() {
+	// set signal handler
+	sigwinch := make(chan os.Signal, 1)
+	defer close(sigwinch)
+	signal.Notify(sigwinch, syscall.SIGWINCH)
+	go func() {
+		for {
+			if _, ok := <-sigwinch; !ok {
+				return
+			}
+			_ = UpdateTermSize()
+			fmt.Printf("TERM WIDTH : %d\n", TERM_WIDTH)
+		}
+	}()
+}
+
+func HandleSigKill() {
+	done := make(chan os.Signal, 1)
+	defer close(done)
+	signal.Notify(done, syscall.SIGINT, syscall.SIGTERM)
+	go func() {
+		<-done // Will block here until user hits ctrl+c
+		cmd := exec.Command("tput", "cnorm")
+		RunCmd(cmd)
+		cmd = exec.Command("tput", "-x", "clear")
+		RunCmd(cmd)
+		os.Exit(0)
+	}()
+}
diff --git a/util/go.mod b/util/go.mod
new file mode 100644
index 0000000..093c216
--- /dev/null
+++ b/util/go.mod
@@ -0,0 +1,3 @@
+module gitea.meta-tech.academy/go/core/util
+
+go 1.20
diff --git a/util/util.go b/util/util.go
new file mode 100644
index 0000000..bad6353
--- /dev/null
+++ b/util/util.go
@@ -0,0 +1,40 @@
+package util
+
+import (
+	"strconv"
+	"strings"
+)
+
+func prependToSliceStr(strs *[]string, prefix string) {
+	for i, elm := range *strs {
+		(*strs)[i] = prefix + elm
+	}
+}
+
+func appendToSliceStr(strs *[]string, suffix string) {
+	for i, elm := range *strs {
+		(*strs)[i] = elm + suffix
+	}
+}
+
+func str2int64(str string, base int, fallback int64) int64 {
+	str = strings.TrimSuffix(str, "\n")
+	num, err := strconv.ParseInt(str, base, 64)
+	if err != nil {
+		num = fallback
+	}
+	return num
+}
+
+func str2int(str string, base int, fallback int) int {
+	return int(str2int64(str, base, int64(fallback)))
+}
+
+func castStrings2ints(strs *[]string) []int {
+	a := make([]int, len(*strs))
+	for i, elm := range *strs {
+		var f int = str2int(elm, 10, 0)
+		a[i] = f
+	}
+	return a
+}