1 files changed, 232 insertions, 0 deletions
diff --git a/vendor/github.com/manifoldco/promptui/cursor.go b/vendor/github.com/manifoldco/promptui/cursor.go
new file mode 100644
index 000000000..7f0961bdb
--- /dev/null
+++ b/vendor/github.com/manifoldco/promptui/cursor.go
@@ -0,0 +1,232 @@
+package promptui
+
+import (
+	"fmt"
+	"strings"
+)
+
+// Pointer is A specific type that translates a given set of runes into a given
+// set of runes pointed at by the cursor.
+type Pointer func(to []rune) []rune
+
+func defaultCursor(ignored []rune) []rune {
+	return []rune("\u2588")
+}
+
+func blockCursor(input []rune) []rune {
+	return []rune(fmt.Sprintf("\\e[7m%s\\e[0m", string(input)))
+}
+
+func pipeCursor(input []rune) []rune {
+	marker := []rune("|")
+	out := []rune{}
+	out = append(out, marker...)
+	out = append(out, input...)
+	return out
+}
+
+var (
+	// DefaultCursor is a big square block character. Obscures whatever was
+	// input.
+	DefaultCursor Pointer = defaultCursor
+	// BlockCursor is a cursor which highlights a character by inverting colors
+	// on it.
+	BlockCursor Pointer = blockCursor
+	// PipeCursor is a pipe character "|" which appears before the input
+	// character.
+	PipeCursor Pointer = pipeCursor
+)
+
+// Cursor tracks the state associated with the movable cursor
+// The strategy is to keep the prompt, input pristine except for requested
+// modifications. The insertion of the cursor happens during a `format` call
+// and we read in new input via an `Update` call
+type Cursor struct {
+	// shows where the user inserts/updates text
+	Cursor Pointer
+	// what the user entered, and what we will echo back to them, after
+	// insertion of the cursor and prefixing with the prompt
+	input []rune
+	// Put the cursor before this slice
+	Position int
+	erase    bool
+}
+
+// NewCursor create a new cursor, with the DefaultCursor, the specified input,
+// and position at the end of the specified starting input.
+func NewCursor(startinginput string, pointer Pointer, eraseDefault bool) Cursor {
+	if pointer == nil {
+		pointer = defaultCursor
+	}
+	cur := Cursor{Cursor: pointer, Position: len(startinginput), input: []rune(startinginput), erase: eraseDefault}
+	if eraseDefault {
+		cur.Start()
+	} else {
+		cur.End()
+	}
+	return cur
+}
+
+func (c *Cursor) String() string {
+	return fmt.Sprintf(
+		"Cursor: %s, input %s, Position %d",
+		string(c.Cursor([]rune(""))), string(c.input), c.Position)
+}
+
+// End is a convenience for c.Place(len(c.input)) so you don't have to know how I
+// indexed.
+func (c *Cursor) End() {
+	c.Place(len(c.input))
+}
+
+// Start is convenience for c.Place(0) so you don't have to know how I
+// indexed.
+func (c *Cursor) Start() {
+	c.Place(0)
+}
+
+// ensures we are in bounds.
+func (c *Cursor) correctPosition() {
+	if c.Position > len(c.input) {
+		c.Position = len(c.input)
+	}
+
+	if c.Position < 0 {
+		c.Position = 0
+	}
+}
+
+// insert the cursor rune array into r before the provided index
+func format(a []rune, c *Cursor) string {
+	i := c.Position
+	var b []rune
+
+	out := make([]rune, 0)
+	if i < len(a) {
+		b = c.Cursor(a[i : i+1])
+		out = append(out, a[:i]...)   // does not include i
+		out = append(out, b...)       // add the cursor
+		out = append(out, a[i+1:]...) // add the rest after i
+	} else {
+		b = c.Cursor([]rune{})
+		out = append(out, a...)
+		out = append(out, b...)
+	}
+	return string(out)
+}
+
+// Format renders the input with the Cursor appropriately positioned.
+func (c *Cursor) Format() string {
+	r := c.input
+	// insert the cursor
+	return format(r, c)
+}
+
+// FormatMask replaces all input runes with the mask rune.
+func (c *Cursor) FormatMask(mask rune) string {
+	if mask == ' ' {
+		return format([]rune{}, c)
+	}
+
+	r := make([]rune, len(c.input))
+	for i := range r {
+		r[i] = mask
+	}
+	return format(r, c)
+}
+
+// Update inserts newinput into the input []rune in the appropriate place.
+// The cursor is moved to the end of the inputed sequence.
+func (c *Cursor) Update(newinput string) {
+	a := c.input
+	b := []rune(newinput)
+	i := c.Position
+	a = append(a[:i], append(b, a[i:]...)...)
+	c.input = a
+	c.Move(len(b))
+}
+
+// Get returns a copy of the input
+func (c *Cursor) Get() string {
+	return string(c.input)
+}
+
+// GetMask returns a mask string with length equal to the input
+func (c *Cursor) GetMask(mask rune) string {
+	return strings.Repeat(string(mask), len(c.input))
+}
+
+// Replace replaces the previous input with whatever is specified, and moves the
+// cursor to the end position
+func (c *Cursor) Replace(input string) {
+	c.input = []rune(input)
+	c.End()
+}
+
+// Place moves the cursor to the absolute array index specified by position
+func (c *Cursor) Place(position int) {
+	c.Position = position
+	c.correctPosition()
+}
+
+// Move moves the cursor over in relative terms, by shift indices.
+func (c *Cursor) Move(shift int) {
+	// delete the current cursor
+	c.Position = c.Position + shift
+	c.correctPosition()
+}
+
+// Backspace removes the rune that precedes the cursor
+//
+// It handles being at the beginning or end of the row, and moves the cursor to
+// the appropriate position.
+func (c *Cursor) Backspace() {
+	a := c.input
+	i := c.Position
+	if i == 0 {
+		// Shrug
+		return
+	}
+	if i == len(a) {
+		c.input = a[:i-1]
+	} else {
+		c.input = append(a[:i-1], a[i:]...)
+	}
+	// now it's pointing to the i+1th element
+	c.Move(-1)
+}
+
+// Listen is a readline Listener that updates internal cursor state appropriately.
+func (c *Cursor) Listen(line []rune, pos int, key rune) ([]rune, int, bool) {
+	if line != nil {
+		// no matter what, update our internal representation.
+		c.Update(string(line))
+	}
+
+	switch key {
+	case 0: // empty
+	case KeyEnter:
+		return []rune(c.Get()), c.Position, false
+	case KeyBackspace, KeyCtrlH:
+		if c.erase {
+			c.erase = false
+			c.Replace("")
+		}
+		c.Backspace()
+	case KeyForward:
+		// the user wants to edit the default, despite how we set it up. Let
+		// them.
+		c.erase = false
+		c.Move(1)
+	case KeyBackward:
+		c.Move(-1)
+	default:
+		if c.erase {
+			c.erase = false
+			c.Replace("")
+			c.Update(string(key))
+		}
+	}
+
+	return []rune(c.Get()), c.Position, true
+}