commit 72f5fa21c75767f9a7a44fb55e0bdb04b81bfb94
Author: milarin <milaring@proton.me>
Date:   Sun Mar 19 13:08:11 2023 +0100

    initial commit

diff --git a/README.md b/README.md
new file mode 100644
index 0000000..808aa70
--- /dev/null
+++ b/README.md
@@ -0,0 +1,3 @@
+# slash
+
+Linux shell
\ No newline at end of file
diff --git a/ansi_seq.go b/ansi_seq.go
new file mode 100644
index 0000000..d8b8957
--- /dev/null
+++ b/ansi_seq.go
@@ -0,0 +1,62 @@
+package main
+
+import (
+	"os"
+	"os/exec"
+)
+
+func doItRaw() {
+	rawMode := exec.Command("/bin/stty", "raw", "-echo")
+	rawMode.Stdin = os.Stdin
+	err := rawMode.Run()
+	if err != nil {
+		panic(err)
+	}
+}
+
+func cook() {
+	cookedMode := exec.Command("/bin/stty", "-raw", "echo")
+	cookedMode.Stdin = os.Stdin
+	err := cookedMode.Run()
+	if err != nil {
+		panic(err)
+	}
+}
+
+func clearEOL() {
+	os.Stdout.Write([]byte{0x1b, 0x5b, 0x4b})
+}
+
+func clear() {
+	os.Stdout.Write([]byte{0x1b, 0x5b, 0x48, 0x1b, 0x5b, 0x32, 0x4a, 0x1b, 0x5b, 0x33, 0x4a})
+}
+
+func goUp() {
+	os.Stdout.Write([]byte{0x1b, 0x5b, 0x41})
+}
+
+func goLeft() {
+	os.Stdout.Write([]byte{0x08})
+}
+
+// func save() {
+// 	cmd := exec.Command("tput", "sc")
+// 	cmd.Stdin = os.Stdin
+// 	cmd.Stdout = os.Stdout
+// 	cmd.Stderr = os.Stderr
+// 	err := cmd.Run()
+// 	if err != nil {
+// 		panic(err)
+// 	}
+// }
+
+// func restore() {
+// 	cmd := exec.Command("tput", "rc")
+// 	cmd.Stdin = os.Stdin
+// 	cmd.Stdout = os.Stdout
+// 	cmd.Stderr = os.Stderr
+// 	err := cmd.Run()
+// 	if err != nil {
+// 		panic(err)
+// 	}
+// }
diff --git a/colorstring.go b/colorstring.go
new file mode 100644
index 0000000..7500522
--- /dev/null
+++ b/colorstring.go
@@ -0,0 +1,46 @@
+package main
+
+import (
+	"unicode/utf8"
+
+	"github.com/fatih/color"
+)
+
+type ColorString struct {
+	color string
+	raw   string
+}
+
+func (s *ColorString) Append(str string, attrs ...color.Attribute) *ColorString {
+	s.color += color.New(attrs...).Sprint(str)
+	s.raw += str
+	return s
+}
+
+func (s *ColorString) AppendColorString(str ...*ColorString) *ColorString {
+	for _, o := range str {
+		s.color += o.color
+		s.raw += o.raw
+	}
+	return s
+}
+
+func (s *ColorString) Equals(other *ColorString) bool {
+	return s.color == other.color && s.raw == other.raw
+}
+
+func (s *ColorString) Len() int {
+	return utf8.RuneCountInString(s.raw)
+}
+
+func (s *ColorString) ColorLen() int {
+	return utf8.RuneCountInString(s.color)
+}
+
+func (s *ColorString) String() string {
+	return s.color
+}
+
+func (s *ColorString) Raw() string {
+	return s.raw
+}
diff --git a/go.mod b/go.mod
new file mode 100644
index 0000000..c39475a
--- /dev/null
+++ b/go.mod
@@ -0,0 +1,16 @@
+module git.milar.in/slash/shell
+
+go 1.17
+
+require (
+	git.milar.in/milarin/adverr v1.1.0
+	github.com/fatih/color v1.12.0
+	golang.org/x/crypto v0.0.0-20210817164053-32db794688a5
+)
+
+require (
+	github.com/mattn/go-colorable v0.1.8 // indirect
+	github.com/mattn/go-isatty v0.0.12 // indirect
+	golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1 // indirect
+	golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1 // indirect
+)
diff --git a/go.sum b/go.sum
new file mode 100644
index 0000000..1fcbe05
--- /dev/null
+++ b/go.sum
@@ -0,0 +1,20 @@
+git.milar.in/milarin/adverr v1.1.0 h1:jD9WnOvs40lfMhvqQ7cllOaRJNBMWr1f07/s9jAadp0=
+git.milar.in/milarin/adverr v1.1.0/go.mod h1:joU9sBb7ySyNv4SpTXB0Z4o1mjXsArBw4N27wjgzj9E=
+github.com/fatih/color v1.12.0 h1:mRhaKNwANqRgUBGKmnI5ZxEk7QXmjQeCcuYFMX2bfcc=
+github.com/fatih/color v1.12.0/go.mod h1:ELkj/draVOlAH/xkhN6mQ50Qd0MPOk5AAr3maGEBuJM=
+github.com/mattn/go-colorable v0.1.8 h1:c1ghPdyEDarC70ftn0y+A/Ee++9zz8ljHG1b13eJ0s8=
+github.com/mattn/go-colorable v0.1.8/go.mod h1:u6P/XSegPjTcexA+o6vUJrdnUu04hMope9wVRipJSqc=
+github.com/mattn/go-isatty v0.0.12 h1:wuysRhFDzyxgEmMf5xjvJ2M9dZoWAXNNr5LSBS7uHXY=
+github.com/mattn/go-isatty v0.0.12/go.mod h1:cbi8OIDigv2wuxKPP5vlRcQ1OAZbq2CE4Kysco4FUpU=
+golang.org/x/crypto v0.0.0-20210817164053-32db794688a5 h1:HWj/xjIHfjYU5nVXpTM0s39J9CbLn7Cc5a7IC5rwsMQ=
+golang.org/x/crypto v0.0.0-20210817164053-32db794688a5/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
+golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
+golang.org/x/sys v0.0.0-20200116001909-b77594299b42/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1 h1:SrN+KX8Art/Sf4HNj6Zcz06G7VEz+7w9tdXTPOZ7+l4=
+golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1 h1:v+OssWQX+hTHEmOBgwxdZxK4zHq3yOs8F9J7mk0PY8E=
+golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
+golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
diff --git a/handle.go b/handle.go
new file mode 100644
index 0000000..e534b7b
--- /dev/null
+++ b/handle.go
@@ -0,0 +1,46 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"strings"
+
+	"git.milar.in/milarin/adverr"
+)
+
+func handle(input string) {
+	input = strings.TrimSpace(input)
+
+	if input == "" {
+		return
+	}
+
+	if input == "up" {
+		goUp()
+		return
+	}
+
+	if strings.HasPrefix(input, "cd ") {
+		os.Chdir(strings.Split(input, " ")[1])
+		return
+	}
+
+	cook()
+	defer doItRaw()
+
+	parts := strings.Split(input, " ")
+	cmd := exec.Command(parts[0], parts[1:]...)
+	cmd.Stdin = os.Stdin
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	if err := cmd.Start(); err != nil {
+		fmt.Println(adverr.Wrap("Could not start process", err))
+		return
+	}
+
+	if err := cmd.Wait(); err != nil {
+		fmt.Println(adverr.Wrap("Could not wait for process to complete", err))
+		return
+	}
+}
diff --git a/input.go b/input.go
new file mode 100644
index 0000000..b2bc27b
--- /dev/null
+++ b/input.go
@@ -0,0 +1,19 @@
+package main
+
+import (
+	"os"
+)
+
+func handleInput() <-chan byte {
+	ch := make(chan byte)
+
+	go func(ch chan byte) {
+		data := make([]byte, 1)
+		for _, err := os.Stdin.Read(data); err == nil; _, err = os.Stdin.Read(data) {
+			ch <- data[0]
+		}
+		close(ch)
+	}(ch)
+
+	return ch
+}
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..3e716ac
--- /dev/null
+++ b/main.go
@@ -0,0 +1,161 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+	"time"
+	"unicode"
+
+	"github.com/fatih/color"
+	"golang.org/x/crypto/ssh/terminal"
+)
+
+var (
+	inputBuffer    = new(ColorString)
+	oldLineContent = new(ColorString)
+	oldWidth       int
+
+	debugInfo string
+)
+
+func main() {
+	// enable raw mode
+	doItRaw()
+	defer cook()
+
+	inputChannel := handleInput()
+
+	running := true
+
+	refreshInputBuffer(true)
+
+	for running {
+		select {
+		case input := <-inputChannel:
+			if unicode.IsControl(rune(input)) {
+				if input == 127 && inputBuffer.Len() > 0 { // Backspace
+					str := inputBuffer.Raw()
+					inputBuffer = new(ColorString)
+					inputBuffer.Append(str[:len(str)-1])
+				} else if input == 12 { // C-L
+					clear()
+					refreshInputBuffer(true)
+				} else if input == 13 { // Enter
+					cmd := inputBuffer.Raw()
+					if strings.TrimSpace(cmd) == "exit" {
+						running = false
+						break
+					}
+					inputBuffer = new(ColorString)
+					fmt.Print("\r\n")
+					handle(cmd)
+					refreshInputBuffer(true)
+				} else if input == 3 { // C-C
+					inputBuffer = new(ColorString)
+				} else if input == 17 { // C-Q
+					running = false
+					break
+				}
+				//fmt.Print(input, "\r\n")
+				break
+			}
+			inputBuffer.Append(string(input))
+		case <-time.After(time.Second):
+
+		}
+
+		refreshInputBuffer(false)
+	}
+}
+
+func refreshInputBuffer(force bool) {
+	ps := prompt()
+	lineContent := new(ColorString).AppendColorString(ps, inputBuffer)
+
+	width, _, err := terminal.GetSize(int(os.Stdin.Fd()))
+	if err != nil {
+		panic(err)
+	}
+	if oldWidth == 0 {
+		oldWidth = width
+	}
+
+	lines := oldLineContent.Len() / width
+	debugInfo = strconv.Itoa(lines)
+
+	for i := 0; i <= lines; i++ {
+		fmt.Print("\r")
+		clearEOL()
+
+		if i < lines {
+			goUp()
+		}
+	}
+
+	fmt.Print(lineContent.String())
+	oldLineContent = lineContent
+	oldWidth = width
+}
+
+// func refreshInputBuffer(force bool) {
+// 	width, _, err := terminal.GetSize(int(os.Stdin.Fd()))
+// 	if err != nil {
+// 		panic(err)
+// 	}
+
+// 	clearEOL()
+// 	debugInfo = fmt.Sprint(oldLineContent.Len(), width, oldLineContent.Len()/width)
+// 	for i := 0; i < oldLineContent.Len()/width; i++ {
+// 		goUp()
+// 	}
+
+// 	ps := prompt()
+// 	lineContent := new(ColorString).AppendColorString(ps, inputBuffer)
+// 	if !force && lineContent.Equals(oldLineContent) {
+// 		return
+// 	}
+
+// 	diff := lineContent.Len() - oldLineContent.Len()
+// 	if diff < 0 {
+// 		diff = -diff
+// 	}
+
+// 	for i := 0; i < diff; i++ {
+// 		goLeft()
+// 	}
+// 	clearEOL()
+
+// 	fmt.Print("\r")
+// 	fmt.Print(lineContent.String())
+// 	oldLineContent = lineContent
+// }
+
+// func getTerminalSize() (width, height int, err error) {
+// 	width, height, err = terminal.GetSize(int(os.Stdout.Fd()))
+// 	if err != nil {
+// 		return 0, 0, adverr.Wrap("Could not retrieve terminal size", err)
+// 	}
+// 	return
+// }
+
+func print(str string, attrs ...color.Attribute) string {
+	return color.New(attrs...).Sprint(str)
+}
+
+func host() string {
+	hostname, _ := os.Hostname()
+	return hostname
+}
+
+func wd() string {
+	wd, _ := os.Getwd()
+	home := env("HOME")
+	return strings.Replace(wd, home, "~", 1)
+}
+
+func env(key string) string {
+	value, _ := os.LookupEnv(key)
+	return value
+}
diff --git a/prompt.go b/prompt.go
new file mode 100644
index 0000000..012c4ea
--- /dev/null
+++ b/prompt.go
@@ -0,0 +1,87 @@
+package main
+
+import (
+	"time"
+
+	"github.com/fatih/color"
+)
+
+var prompts = []func() *ColorString{ps1, ps2, ps3, ps4, ps5}
+
+func prompt() *ColorString {
+	// width, _, err := terminal.GetSize(int(os.Stdin.Fd()))
+	// if err != nil {
+	// 	return ">"
+	// }
+
+	return ps1()
+
+	// for _, pfunc := range prompts {
+	// 	prompt := pfunc()
+	// 	if prompt.Len()+inputBuffer.Len() < width {
+	// 		return prompt.String()
+	// 	}
+	// }
+}
+
+func ps1() *ColorString {
+	p := new(ColorString)
+	p.Append(time.Now().Format("15:04:05"), color.FgRed)
+	p.Append(" • ")
+
+	p.Append(debugInfo, color.FgMagenta)
+	if len(debugInfo) > 0 {
+		p.Append(" • ")
+	}
+
+	p.Append(env("USER"), color.FgGreen)
+	p.Append(" • ")
+	p.Append(host(), color.FgYellow)
+	p.Append(" • ")
+	p.Append(wd(), color.FgBlue)
+	p.Append(" ❯", color.FgRed)
+	p.Append("❯", color.FgYellow)
+	p.Append("❯ ", color.FgGreen)
+	return p
+}
+
+func ps2() *ColorString {
+	p := new(ColorString)
+	p.Append(env("USER"), color.FgGreen)
+	p.Append(" • ")
+	p.Append(host(), color.FgYellow)
+	p.Append(" • ")
+	p.Append(wd(), color.FgBlue)
+	p.Append(" ❯", color.FgRed)
+	p.Append("❯", color.FgYellow)
+	p.Append("❯ ", color.FgGreen)
+	return p
+}
+
+func ps3() *ColorString {
+	p := new(ColorString)
+	p.Append(env("USER"), color.FgGreen)
+	p.Append(" • ")
+	p.Append(wd(), color.FgBlue)
+	p.Append(" ❯", color.FgRed)
+	p.Append("❯", color.FgYellow)
+	p.Append("❯ ", color.FgGreen)
+	return p
+}
+
+func ps4() *ColorString {
+	p := new(ColorString)
+	p.Append(wd(), color.FgBlue)
+	p.Append(" ❯", color.FgRed)
+	p.Append("❯", color.FgYellow)
+	p.Append("❯ ", color.FgGreen)
+	return p
+}
+
+func ps5() *ColorString {
+	p := new(ColorString)
+	p.Append(" ❯", color.FgRed)
+	p.Append("❯", color.FgYellow)
+	p.Append("❯ ", color.FgGreen)
+	return p
+}