Switch to go in order to use tcell

cursor.go

@@ -0,0 +1,147 @@
+package main
+
+import (
+	"strings"
+)
+
+// Cursor stores the location of the cursor in the view
+type Cursor struct {
+	v *View
+
+	x   int
+	y   int
+	loc int
+
+	selectionStart int
+	selectionEnd   int
+}
+
+func (c *Cursor) resetSelection() {
+	c.selectionStart = 0
+	c.selectionEnd = 0
+}
+
+func (c *Cursor) hasSelection() bool {
+	return (c.selectionEnd - c.selectionStart) > 0
+}
+
+func (c *Cursor) deleteSelected() {
+	// TODO: Implement this
+}
+
+func (c *Cursor) up() {
+	if c.y > 0 {
+		c.loc -= count(c.v.buf.lines[c.y][:c.x])
+		// Count the newline
+		c.loc--
+		c.y--
+
+		if c.x > count(c.v.buf.lines[c.y]) {
+			c.x = count(c.v.buf.lines[c.y])
+		}
+
+		c.loc -= count(c.v.buf.lines[c.y][c.x:])
+	}
+}
+func (c *Cursor) down() {
+	if c.y < len(c.v.buf.lines)-1 {
+		c.loc += count(c.v.buf.lines[c.y][c.x:])
+		// Count the newline
+		c.loc++
+		c.y++
+
+		if c.x > count(c.v.buf.lines[c.y]) {
+			c.x = count(c.v.buf.lines[c.y])
+		}
+
+		c.loc += count(c.v.buf.lines[c.y][:c.x])
+	}
+}
+func (c *Cursor) left() {
+	if c.x > 0 {
+		c.loc--
+		c.x--
+	} else {
+		c.up()
+		c.end()
+	}
+}
+func (c *Cursor) right() {
+	if c.x < count(c.v.buf.lines[c.y]) {
+		c.loc++
+		c.x++
+	} else {
+		c.down()
+		c.start()
+	}
+}
+
+func (c *Cursor) end() {
+	c.loc += count(c.v.buf.lines[c.y][c.x:])
+	c.x = count(c.v.buf.lines[c.y])
+}
+
+func (c *Cursor) start() {
+	c.loc -= count(c.v.buf.lines[c.y][:c.x])
+	c.x = 0
+}
+
+func (c *Cursor) getCharPos(lineNum, visualPos int) int {
+	visualLine := strings.Replace(c.v.buf.lines[lineNum], "\t", "\t"+emptyString(tabSize-1), -1)
+	if visualPos > count(visualLine) {
+		visualPos = count(visualLine)
+	}
+	numTabs := numOccurences(visualLine[:visualPos], '\t')
+	return visualPos - (tabSize-1)*numTabs
+}
+
+func (c *Cursor) distance(x, y int) int {
+	// Same line
+	if y == c.y {
+		return x - c.x
+	}
+
+	var distance int
+	if y > c.y {
+		distance += count(c.v.buf.lines[c.y][c.x:])
+		// Newline
+		distance++
+		i := 1
+		for y != c.y+i {
+			distance += count(c.v.buf.lines[c.y+i])
+			// Newline
+			distance++
+			i++
+		}
+		if x < count(c.v.buf.lines[y]) {
+			distance += count(c.v.buf.lines[y][:x])
+		} else {
+			distance += count(c.v.buf.lines[y])
+		}
+		return distance
+	}
+
+	distance -= count(c.v.buf.lines[c.y][:c.x])
+	// Newline
+	distance--
+	i := 1
+	for y != c.y-i {
+		distance -= count(c.v.buf.lines[c.y-i])
+		// Newline
+		distance--
+		i++
+	}
+	if x > 0 {
+		distance -= count(c.v.buf.lines[y][x:])
+	}
+	return distance
+}
+
+func (c *Cursor) display() {
+	if c.y-c.v.topline < 0 || c.y-c.v.topline > c.v.linesN-1 {
+		c.v.s.HideCursor()
+	} else {
+		voffset := numOccurences(c.v.buf.lines[c.y][:c.x], '\t') * (tabSize - 1)
+		c.v.s.ShowCursor(c.x+voffset, c.y-c.v.topline)
+	}
+}