Initial checkin from CRI-O repo

Signed-off-by: Matthew Heon <matthew.heon@gmail.com>

vendor/github.com/buger/goterm/terminal.go

@@ -0,0 +1,258 @@
+// Provides basic bulding blocks for advanced console UI
+//
+// Coordinate system:
+//
+//  1/1---X---->
+//   |
+//   Y
+//   |
+//   v
+//
+// Documentation for ANSI codes: http://en.wikipedia.org/wiki/ANSI_escape_code#Colors
+//
+// Inspired by: http://www.darkcoding.net/software/pretty-command-line-console-output-on-unix-in-python-and-go-lang/
+package goterm
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"os"
+	"strings"
+)
+
+// Reset all custom styles
+const RESET = "\033[0m"
+
+// Reset to default color
+const RESET_COLOR = "\033[32m"
+
+// Return curor to start of line and clean it
+const RESET_LINE = "\r\033[K"
+
+// List of possible colors
+const (
+	BLACK = iota
+	RED
+	GREEN
+	YELLOW
+	BLUE
+	MAGENTA
+	CYAN
+	WHITE
+)
+
+var Output *bufio.Writer = bufio.NewWriter(os.Stdout)
+
+func getColor(code int) string {
+	return fmt.Sprintf("\033[3%dm", code)
+}
+
+func getBgColor(code int) string {
+	return fmt.Sprintf("\033[4%dm", code)
+}
+
+// Set percent flag: num | PCT
+//
+// Check percent flag: num & PCT
+//
+// Reset percent flag: num & 0xFF
+const shift = uint(^uint(0)>>63) << 4
+const PCT = 0x8000 << shift
+
+type winsize struct {
+	Row    uint16
+	Col    uint16
+	Xpixel uint16
+	Ypixel uint16
+}
+
+// Global screen buffer
+// Its not recommented write to buffer dirrectly, use package Print,Printf,Println fucntions instead.
+var Screen *bytes.Buffer = new(bytes.Buffer)
+
+// Get relative or absolute coorditantes
+// To get relative, set PCT flag to number:
+//
+//      // Get 10% of total width to `x` and 20 to y
+//      x, y = tm.GetXY(10|tm.PCT, 20)
+//
+func GetXY(x int, y int) (int, int) {
+	if y == -1 {
+		y = CurrentHeight() + 1
+	}
+
+	if x&PCT != 0 {
+		x = int((x & 0xFF) * Width() / 100)
+	}
+
+	if y&PCT != 0 {
+		y = int((y & 0xFF) * Height() / 100)
+	}
+
+	return x, y
+}
+
+type sf func(int, string) string
+
+// Apply given transformation func for each line in string
+func applyTransform(str string, transform sf) (out string) {
+	out = ""
+
+	for idx, line := range strings.Split(str, "\n") {
+		out += transform(idx, line)
+	}
+
+	return
+}
+
+// Clear screen
+func Clear() {
+	Output.WriteString("\033[2J")
+}
+
+// Move cursor to given position
+func MoveCursor(x int, y int) {
+	fmt.Fprintf(Screen, "\033[%d;%dH", x, y)
+}
+
+// Move cursor up relative the current position
+func MoveCursorUp(bias int) {
+	fmt.Fprintf(Screen, "\033[%dA", bias)
+}
+
+// Move cursor down relative the current position
+func MoveCursorDown(bias int) {
+	fmt.Fprintf(Screen, "\033[%dB", bias)
+}
+
+// Move cursor forward relative the current position
+func MoveCursorForward(bias int) {
+	fmt.Fprintf(Screen, "\033[%dC", bias)
+}
+
+// Move cursor backward relative the current position
+func MoveCursorBackward(bias int) {
+	fmt.Fprintf(Screen, "\033[%dD", bias)
+}
+
+// Move string to possition
+func MoveTo(str string, x int, y int) (out string) {
+	x, y = GetXY(x, y)
+
+	return applyTransform(str, func(idx int, line string) string {
+		return fmt.Sprintf("\033[%d;%dH%s", y+idx, x, line)
+	})
+}
+
+// Return carrier to start of line
+func ResetLine(str string) (out string) {
+	return applyTransform(str, func(idx int, line string) string {
+		return fmt.Sprintf(RESET_LINE, line)
+	})
+}
+
+// Make bold
+func Bold(str string) string {
+	return applyTransform(str, func(idx int, line string) string {
+		return fmt.Sprintf("\033[1m%s\033[0m", line)
+	})
+}
+
+// Apply given color to string:
+//
+//     tm.Color("RED STRING", tm.RED)
+//
+func Color(str string, color int) string {
+	return applyTransform(str, func(idx int, line string) string {
+		return fmt.Sprintf("%s%s%s", getColor(color), line, RESET)
+	})
+}
+
+func Highlight(str, substr string, color int) string {
+	hiSubstr := Color(substr, color)
+	return strings.Replace(str, substr, hiSubstr, -1)
+}
+
+func HighlightRegion(str string, from, to, color int) string {
+	return str[:from] + Color(str[from:to], color) + str[to:]
+}
+
+// Change background color of string:
+//
+//     tm.Background("string", tm.RED)
+//
+func Background(str string, color int) string {
+	return applyTransform(str, func(idx int, line string) string {
+		return fmt.Sprintf("%s%s%s", getBgColor(color), line, RESET)
+	})
+}
+
+// Get console width
+func Width() int {
+	ws, err := getWinsize()
+
+	if err != nil {
+		return -1
+	}
+
+	return int(ws.Col)
+}
+
+// Get console height
+func Height() int {
+	ws, err := getWinsize()
+	if err != nil {
+		return -1
+	}
+	return int(ws.Row)
+}
+
+// Get current height. Line count in Screen buffer.
+func CurrentHeight() int {
+	return strings.Count(Screen.String(), "\n")
+}
+
+// Flush buffer and ensure that it will not overflow screen
+func Flush() {
+	for idx, str := range strings.Split(Screen.String(), "\n") {
+		if idx > Height() {
+			return
+		}
+
+		Output.WriteString(str + "\n")
+	}
+
+	Output.Flush()
+	Screen.Reset()
+}
+
+func Print(a ...interface{}) (n int, err error) {
+	return fmt.Fprint(Screen, a...)
+}
+
+func Println(a ...interface{}) (n int, err error) {
+	return fmt.Fprintln(Screen, a...)
+}
+
+func Printf(format string, a ...interface{}) (n int, err error) {
+	return fmt.Fprintf(Screen, format, a...)
+}
+
+func Context(data string, idx, max int) string {
+	var start, end int
+
+	if len(data[:idx]) < (max / 2) {
+		start = 0
+	} else {
+		start = idx - max/2
+	}
+
+	if len(data)-idx < (max / 2) {
+		end = len(data) - 1
+	} else {
+		end = idx + max/2
+	}
+
+	return data[start:end]
+}