Add term package (back) with clean esc

term/esc/esc.go

@@ -0,0 +1,69 @@
+/*
+Package esc contains commonly used ANSI terminal escape sequences for
+different attributes and terminal control. These are meant to be printed
+directly to any terminal supporting the curses standard. They should be
+used directly whenever possible for best terminal performance.  Also see
+the equivalent variables in the term package that are set to empty strings when support for them is not detected at init() time in order to maintain
+the original stateful approach to terminal escape sequence support (first designed for the terminfo C library.)
+*/
+package esc
+
+const (
+	Reset     = "\033[0m"
+	Bold      = "\033[1m"
+	Faint     = "\033[2m"
+	Italic    = "\033[3m"
+	Underline = "\033[4m"
+	BlinkSlow = "\033[5m"
+	BlinkFast = "\033[6m"
+	Reverse   = "\033[7m"
+	Concealed = "\033[8m"
+	StrikeOut = "\033[9m"
+
+	BoldItalic = "\033[1m\033[3m"
+
+	Black   = "\033[30m"
+	Red     = "\033[31m"
+	Green   = "\033[32m"
+	Yellow  = "\033[33m"
+	Blue    = "\033[34m"
+	Magenta = "\033[35m"
+	Cyan    = "\033[36m"
+	White   = "\033[37m"
+
+	BBlack   = "\033[40m"
+	BRed     = "\033[41m"
+	BGreen   = "\033[42m"
+	BYellow  = "\033[43m"
+	BBlue    = "\033[44m"
+	BMagenta = "\033[45m"
+	BCyan    = "\033[46m"
+	BWhite   = "\033[47m"
+
+	HBlack   = "\033[90m"
+	HRed     = "\033[91m"
+	HGreen   = "\033[92m"
+	HYellow  = "\033[93m"
+	HBlue    = "\033[94m"
+	HMagenta = "\033[95m"
+	HCyan    = "\033[96m"
+	HWhite   = "\033[97m"
+
+	BHBlack   = "\033[100m"
+	BHRed     = "\033[101m"
+	BHGreen   = "\033[102m"
+	BHYellow  = "\033[103m"
+	BHBlue    = "\033[104m"
+	BHMagenta = "\033[105m"
+	BHCyan    = "\033[106m"
+	BHWhite   = "\033[107m"
+
+	ClearScreen = "\033[2J\033[H"
+
+	X  = "\033[0m"        // Reset
+	B  = "\033[1m"        // Bold
+	I  = "\033[3m"        // Italic
+	U  = "\033[4m"        // Underline
+	BI = "\033[1m\033[3m" // BoldItalic
+	CS = "\033[2J\033[H"  // ClearScreen
+)

term/term.go

@@ -0,0 +1,30 @@
+package term
+
+import (
+	"os"
+)
+
+// WinSizeStruct is the exact struct used by the ioctl system library.
+type WinSizeStruct struct {
+	Row, Col       uint16
+	Xpixel, Ypixel uint16
+}
+
+// WinSize is 80x24 by default but is detected and set to a more
+// accurate value at init() time on systems that support ioctl
+// (currently) and can be updated with WinSizeUpdate on systems that
+// support it. This value can be overriden by those wishing a more
+// consistent value or who prefer not to fill the screen completely when
+// displaying help and usage information.
+var WinSize WinSizeStruct
+
+// IsTerminal returns true if the output is to an interactive terminal
+// (not piped in any way). This is useful when detemining if an extra
+// line return is needed to avoid making programs chomp the line returns
+// unnecessarily.
+func IsTerminal() bool {
+	if fileInfo, _ := os.Stdout.Stat(); (fileInfo.Mode() & os.ModeCharDevice) != 0 {
+		return true
+	}
+	return false
+}

term/term_test.go

@@ -0,0 +1,37 @@
+package term
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"testing"
+)
+
+// coverage will never catch this test
+
+func TestIsTerminal_false(t *testing.T) {
+	if os.Getenv("TEST_ISNOTTERM") == "1" {
+		fmt.Println("out")
+		if !IsTerminal() {
+			os.Exit(20)
+		}
+		os.Exit(1)
+	}
+	exe := os.Args[0]
+	cmd := exec.Command(exe, "-test.run=TestIsTerminal_false")
+	cmd.Env = append(os.Environ(), "TEST_ISNOTTERM=1")
+	cmd.StdoutPipe() // just enough to push into background
+	err := cmd.Run()
+	if e, ok := err.(*exec.ExitError); ok {
+		t.Log(e.ExitCode())
+		if e.ExitCode() != 20 {
+			t.Errorf("exit %v: still a terminal", e.ExitCode())
+		}
+	}
+}
+
+func TestIsTerminal_true(t *testing.T) {
+	if !IsTerminal() {
+		t.Error("terminal not connected")
+	}
+}

term/winsize.go

@@ -0,0 +1,14 @@
+//go:build !aix && !js && !nacl && !plan9 && !windows && !android && !solaris
+
+package term
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+func WinSizeUpdate() {
+	syscall.Syscall(syscall.SYS_IOCTL,
+		uintptr(0), uintptr(syscall.TIOCGWINSZ),
+		uintptr(unsafe.Pointer(&WinSize)))
+}

term/winsize_dummy.go

@@ -0,0 +1,7 @@
+//go:build aix || js || nacl || plan9 || windows || android || solaris
+
+package term
+
+func WinSizeUpdate() {
+	WinSize = WinSizeStruct{80, 24, 100, 100}
+}