Add session commands

- SetWindowTitle(title)
- SetForegroundColor(color)
- SetBackgroundColor(color)
- SetCursorColor(color)
- SaveScreen
- RestoreScreen

Author: muesli

README.md

@@ -145,30 +145,12 @@ fmt.Println(&buf)
 Other available helper functions are: `Faint`, `Italic`, `CrossOut`,
 `Underline`, `Overline`, `Reverse`, and `Blink`.
 
-## Screen
+## Positioning
 
 ```go
-// Reset the terminal to its default style, removing any active styles
-termenv.Reset()
-
-// Switch to the altscreen. The former view can be restored with ExitAltScreen()
-termenv.AltScreen()
-
-// Exit the altscreen and return to the former terminal view
-termenv.ExitAltScreen()
-
-// Clear the visible portion of the terminal
-termenv.ClearScreen()
-
 // Move the cursor to a given position
 termenv.MoveCursor(row, column)
 
-// Hide the cursor
-termenv.HideCursor()
-
-// Show the cursor
-termenv.ShowCursor()
-
 // Save the cursor position
 termenv.SaveCursorPosition()
 
@@ -194,6 +176,28 @@ termenv.CursorNextLine(n)
 // Move the cursor up a given number of lines and place it at the beginning of
 // the line
 termenv.CursorPrevLine(n)
+```
+
+## Screen
+
+```go
+// Reset the terminal to its default style, removing any active styles
+termenv.Reset()
+
+// RestoreScreen restores a previously saved screen state
+termenv.RestoreScreen()
+
+// SaveScreen saves the screen state
+termenv.SaveScreen()
+
+// Switch to the altscreen. The former view can be restored with ExitAltScreen()
+termenv.AltScreen()
+
+// Exit the altscreen and return to the former terminal view
+termenv.ExitAltScreen()
+
+// Clear the visible portion of the terminal
+termenv.ClearScreen()
 
 // Clear the current line
 termenv.ClearLine()
@@ -213,6 +217,28 @@ termenv.InsertLines(n)
 termenv.DeleteLines(n)
 ```
 
+## Session
+
+```go
+// SetWindowTitle sets the terminal window title
+termenv.SetWindowTitle(title)
+
+// SetForegroundColor sets the default foreground color
+termenv.SetForegroundColor(color)
+
+// SetBackgroundColor sets the default background color
+termenv.SetBackgroundColor(color)
+
+// SetCursorColor sets the cursor color
+termenv.SetCursorColor(color)
+
+// Hide the cursor
+termenv.HideCursor()
+
+// Show the cursor
+termenv.ShowCursor()
+```
+
 ## Mouse
 
 ```go

screen.go

@@ -6,6 +6,7 @@ import (
 )
 
 const (
+	// Cursor positioning.
 	CursorUpSeq              = "%dA"
 	CursorDownSeq            = "%dB"
 	CursorForwardSeq         = "%dC"
@@ -29,8 +30,7 @@ const (
 	EraseLineLeftSeq   = "1K"
 	EraseEntireLineSeq = "2K"
 
-	ShowCursorSeq             = "?25h"
-	HideCursorSeq             = "?25l"
+	// Mouse.
 	EnableMousePressSeq       = "?9h" // press only (X10)
 	DisableMousePressSeq      = "?9l"
 	EnableMouseSeq            = "?1000h" // press, release, wheel
@@ -41,15 +41,52 @@ const (
 	DisableMouseCellMotionSeq = "?1002l"
 	EnableMouseAllMotionSeq   = "?1003h" // press, release, move, wheel
 	DisableMouseAllMotionSeq  = "?1003l"
-	AltScreenSeq              = "?1049h"
-	ExitAltScreenSeq          = "?1049l"
+
+	// Screen.
+	RestoreScreenSeq = "?47l"
+	SaveScreenSeq    = "?47h"
+	AltScreenSeq     = "?1049h"
+	ExitAltScreenSeq = "?1049l"
+
+	// Session.
+	SetWindowTitleSeq     = "2;%s\007"
+	SetForegroundColorSeq = "10;%s\007"
+	SetBackgroundColorSeq = "11;%s\007"
+	SetCursorColorSeq     = "12;%s\007"
+	ShowCursorSeq         = "?25h"
+	HideCursorSeq         = "?25l"
 )
 
 // Reset the terminal to its default style, removing any active styles.
 func Reset() {
 	fmt.Print(CSI + ResetSeq + "m")
 }
 
+// SetForegroundColor sets the default foreground color.
+func SetForegroundColor(color Color) {
+	fmt.Printf(OSC+SetForegroundColorSeq, color)
+}
+
+// SetBackgroundColor sets the default background color.
+func SetBackgroundColor(color Color) {
+	fmt.Printf(OSC+SetBackgroundColorSeq, color)
+}
+
+// SetCursorColor sets the cursor color.
+func SetCursorColor(color Color) {
+	fmt.Printf(OSC+SetCursorColorSeq, color)
+}
+
+// RestoreScreen restores a previously saved screen state.
+func RestoreScreen() {
+	fmt.Print(CSI + RestoreScreenSeq)
+}
+
+// SaveScreen saves the screen state.
+func SaveScreen() {
+	fmt.Print(CSI + SaveScreenSeq)
+}
+
 // AltScreen switches to the alternate screen buffer. The former view can be
 // restored with ExitAltScreen().
 func AltScreen() {
@@ -213,3 +250,8 @@ func EnableMouseAllMotion() {
 func DisableMouseAllMotion() {
 	fmt.Print(CSI + DisableMouseAllMotionSeq)
 }
+
+// SetWindowTitle sets the terminal window title.
+func SetWindowTitle(title string) {
+	fmt.Printf(OSC+SetWindowTitleSeq, title)
+}

termenv.go

@@ -15,6 +15,7 @@ type Profile int
 
 const (
 	CSI = "\x1b["
+	OSC = "\x1b]"
 
 	Ascii = Profile(iota)
 	ANSI