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// 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 cursor 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 recommended write to buffer dirrectly, use package Print,Printf,Println fucntions instead.
var Screen *bytes.Buffer = new(bytes.Buffer)
// Get relative or absolute coordinates
// 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", y, x)
}
// 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("%s%s", 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.SplitAfter(Screen.String(), "\n") {
if idx > Height() {
return
}
Output.WriteString(str)
}
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]
}
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