chore: vendor

vendor/github.com/AlecAivazis/survey/v2/terminal/cursor.go

@@ -0,0 +1,209 @@
+//go:build !windows
+// +build !windows
+
+package terminal
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"io"
+	"regexp"
+	"strconv"
+)
+
+var COORDINATE_SYSTEM_BEGIN Short = 1
+
+var dsrPattern = regexp.MustCompile(`\x1b\[(\d+);(\d+)R$`)
+
+type Cursor struct {
+	In  FileReader
+	Out FileWriter
+}
+
+// Up moves the cursor n cells to up.
+func (c *Cursor) Up(n int) error {
+	_, err := fmt.Fprintf(c.Out, "\x1b[%dA", n)
+	return err
+}
+
+// Down moves the cursor n cells to down.
+func (c *Cursor) Down(n int) error {
+	_, err := fmt.Fprintf(c.Out, "\x1b[%dB", n)
+	return err
+}
+
+// Forward moves the cursor n cells to right.
+func (c *Cursor) Forward(n int) error {
+	_, err := fmt.Fprintf(c.Out, "\x1b[%dC", n)
+	return err
+}
+
+// Back moves the cursor n cells to left.
+func (c *Cursor) Back(n int) error {
+	_, err := fmt.Fprintf(c.Out, "\x1b[%dD", n)
+	return err
+}
+
+// NextLine moves cursor to beginning of the line n lines down.
+func (c *Cursor) NextLine(n int) error {
+	if err := c.Down(1); err != nil {
+		return err
+	}
+	return c.HorizontalAbsolute(0)
+}
+
+// PreviousLine moves cursor to beginning of the line n lines up.
+func (c *Cursor) PreviousLine(n int) error {
+	if err := c.Up(1); err != nil {
+		return err
+	}
+	return c.HorizontalAbsolute(0)
+}
+
+// HorizontalAbsolute moves cursor horizontally to x.
+func (c *Cursor) HorizontalAbsolute(x int) error {
+	_, err := fmt.Fprintf(c.Out, "\x1b[%dG", x)
+	return err
+}
+
+// Show shows the cursor.
+func (c *Cursor) Show() error {
+	_, err := fmt.Fprint(c.Out, "\x1b[?25h")
+	return err
+}
+
+// Hide hide the cursor.
+func (c *Cursor) Hide() error {
+	_, err := fmt.Fprint(c.Out, "\x1b[?25l")
+	return err
+}
+
+// move moves the cursor to a specific x,y location.
+func (c *Cursor) move(x int, y int) error {
+	_, err := fmt.Fprintf(c.Out, "\x1b[%d;%df", x, y)
+	return err
+}
+
+// Save saves the current position
+func (c *Cursor) Save() error {
+	_, err := fmt.Fprint(c.Out, "\x1b7")
+	return err
+}
+
+// Restore restores the saved position of the cursor
+func (c *Cursor) Restore() error {
+	_, err := fmt.Fprint(c.Out, "\x1b8")
+	return err
+}
+
+// for comparability purposes between windows
+// in unix we need to print out a new line on some terminals
+func (c *Cursor) MoveNextLine(cur *Coord, terminalSize *Coord) error {
+	if cur.Y == terminalSize.Y {
+		if _, err := fmt.Fprintln(c.Out); err != nil {
+			return err
+		}
+	}
+	return c.NextLine(1)
+}
+
+// Location returns the current location of the cursor in the terminal
+func (c *Cursor) Location(buf *bytes.Buffer) (*Coord, error) {
+	// ANSI escape sequence for DSR - Device Status Report
+	// https://en.wikipedia.org/wiki/ANSI_escape_code#CSI_sequences
+	if _, err := fmt.Fprint(c.Out, "\x1b[6n"); err != nil {
+		return nil, err
+	}
+
+	// There may be input in Stdin prior to CursorLocation so make sure we don't
+	// drop those bytes.
+	var loc []int
+	var match string
+	for loc == nil {
+		// Reports the cursor position (CPR) to the application as (as though typed at
+		// the keyboard) ESC[n;mR, where n is the row and m is the column.
+		reader := bufio.NewReader(c.In)
+		text, err := reader.ReadSlice(byte('R'))
+		if err != nil {
+			return nil, err
+		}
+
+		loc = dsrPattern.FindStringIndex(string(text))
+		if loc == nil {
+			// After reading slice to byte 'R', the bufio Reader may have read more
+			// bytes into its internal buffer which will be discarded on next ReadSlice.
+			// We create a temporary buffer to read the remaining buffered slice and
+			// write them to output buffer.
+			buffered := make([]byte, reader.Buffered())
+			_, err = io.ReadFull(reader, buffered)
+			if err != nil {
+				return nil, err
+			}
+
+			// Stdin contains R that doesn't match DSR, so pass the bytes along to
+			// output buffer.
+			buf.Write(text)
+			buf.Write(buffered)
+		} else {
+			// Write the non-matching leading bytes to output buffer.
+			buf.Write(text[:loc[0]])
+
+			// Save the matching bytes to extract the row and column of the cursor.
+			match = string(text[loc[0]:loc[1]])
+		}
+	}
+
+	matches := dsrPattern.FindStringSubmatch(string(match))
+	if len(matches) != 3 {
+		return nil, fmt.Errorf("incorrect number of matches: %d", len(matches))
+	}
+
+	col, err := strconv.Atoi(matches[2])
+	if err != nil {
+		return nil, err
+	}
+
+	row, err := strconv.Atoi(matches[1])
+	if err != nil {
+		return nil, err
+	}
+
+	return &Coord{Short(col), Short(row)}, nil
+}
+
+func (cur Coord) CursorIsAtLineEnd(size *Coord) bool {
+	return cur.X == size.X
+}
+
+func (cur Coord) CursorIsAtLineBegin() bool {
+	return cur.X == COORDINATE_SYSTEM_BEGIN
+}
+
+// Size returns the height and width of the terminal.
+func (c *Cursor) Size(buf *bytes.Buffer) (*Coord, error) {
+	// the general approach here is to move the cursor to the very bottom
+	// of the terminal, ask for the current location and then move the
+	// cursor back where we started
+
+	// hide the cursor (so it doesn't blink when getting the size of the terminal)
+	c.Hide()
+	defer c.Show()
+
+	// save the current location of the cursor
+	c.Save()
+	defer c.Restore()
+
+	// move the cursor to the very bottom of the terminal
+	c.move(999, 999)
+
+	// ask for the current location
+	bottom, err := c.Location(buf)
+	if err != nil {
+		return nil, err
+	}
+
+	// since the bottom was calculated in the lower right corner, it
+	// is the dimensions we are looking for
+	return bottom, nil
+}