From 785ac2b60e64f00131c01acdad09cbb9ed0bb505 Mon Sep 17 00:00:00 2001
From: Liam Galvin <liam.galvin@switchconcepts.com>
Date: Wed, 27 Jun 2018 17:29:16 +0100
Subject: [PATCH] Initial commit

---
 README.md  |  7 +++++
 gui/gui.go |  3 ++
 main.go    | 21 +++++++++++++
 pty/pty.go | 89 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 120 insertions(+)
 create mode 100644 README.md
 create mode 100644 gui/gui.go
 create mode 100644 main.go
 create mode 100644 pty/pty.go

diff --git a/README.md b/README.md
new file mode 100644
index 0000000..a67d1f5
--- /dev/null
+++ b/README.md
@@ -0,0 +1,7 @@
+# Terminal
+
+## Platform Support
+
+| Linux   | Yes
+| MacOSX  | Not yet...
+| Windows | Not yet...
diff --git a/gui/gui.go b/gui/gui.go
new file mode 100644
index 0000000..ee99ddd
--- /dev/null
+++ b/gui/gui.go
@@ -0,0 +1,3 @@
+package gui
+
+
diff --git a/main.go b/main.go
new file mode 100644
index 0000000..842d68c
--- /dev/null
+++ b/main.go
@@ -0,0 +1,21 @@
+package main
+
+import (
+	"io"
+	"os"
+
+	"gitlab.com/liamg/terminal/pty"
+)
+
+func main() {
+
+	pty, err := pty.NewPtyWithShell()
+	if err != nil {
+		panic(err)
+	}
+
+	go io.Copy(pty, os.Stdin)
+	io.Copy(os.Stdout, pty)
+
+	//	return pty, err
+}
diff --git a/pty/pty.go b/pty/pty.go
new file mode 100644
index 0000000..f68a04b
--- /dev/null
+++ b/pty/pty.go
@@ -0,0 +1,89 @@
+package pty
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"syscall"
+	"unsafe"
+)
+
+func NewPtyWithShell() (*os.File, error) {
+	pty, tty, err := open()
+	if err != nil {
+		return nil, err
+	}
+	defer tty.Close()
+	shell := exec.Command("/bin/bash")
+	shell.Stdout = tty
+	shell.Stdin = tty
+	shell.Stderr = tty
+	shell.SysProcAttr = &syscall.SysProcAttr{Setctty: true, Setsid: true}
+	if err := shell.Start(); err != nil {
+		pty.Close()
+		return nil, err
+	}
+	return pty, nil
+}
+
+// todo: port these for darwin/windows:
+func open() (*os.File, *os.File, error) {
+
+	pty, err := getpt()
+	if err != nil {
+		panic(err)
+	}
+
+	ptsName, err := ptsname(pty)
+	if err != nil {
+		panic(err)
+	}
+
+	//	err = grantpt(pty)
+	//	if err != nil {
+	//		return nil, nil, err
+	//	}
+
+	err = unlockpt(pty)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	tty, err := os.OpenFile(ptsName, os.O_RDWR, 0)
+	if err != nil {
+		return nil, nil, err
+	}
+	return pty, tty, nil
+
+}
+
+func getpt() (file *os.File, err error) {
+	return os.OpenFile("/dev/ptmx", os.O_RDWR, 0)
+}
+
+func ptsname(file *os.File) (name string, err error) {
+	n, err := ioctl(file, syscall.TIOCGPTN, 0)
+	return fmt.Sprintf("/dev/pts/%d", n), err
+}
+
+func ioctl(file *os.File, command uint, arg int) (int, error) {
+	_, _, err := syscall.Syscall(syscall.SYS_IOCTL, uintptr(file.Fd()),
+		uintptr(command), uintptr(unsafe.Pointer(&arg)))
+	if err != 0 {
+		return 0, fmt.Errorf("Error no %d", err)
+	}
+	return arg, nil
+}
+
+/*
+func grantpt(f *os.File) error {
+	_, err := ioctl(f, syscall.TIOCPTYGRANT, 0)
+	syscall.SYS
+	return err
+}
+*/
+
+func unlockpt(f *os.File) error {
+	_, err := ioctl(f, syscall.TIOCSPTLCK, 0)
+	return err
+}