Add support for selection and copy in terminal

This commit adds mouse and copy support in the terminal emulator
in micro.

cmd/micro/terminal.go

@@ -1,6 +1,8 @@
 package main
 
 import (
+	"fmt"
+	"os"
 	"os/exec"
 	"strconv"
 
@@ -16,10 +18,37 @@ const (
 
 // A Terminal holds information for the terminal emulator
 type Terminal struct {
-	state  terminal.State
-	term   *terminal.VT
-	title  string
-	status int
+	state     terminal.State
+	term      *terminal.VT
+	title     string
+	status    int
+	selection [2]Loc
+}
+
+// HasSelection returns whether this terminal has a valid selection
+func (t *Terminal) HasSelection() bool {
+	return t.selection[0] != t.selection[1]
+}
+
+// GetSelection returns the selected text
+func (t *Terminal) GetSelection(width int) string {
+	start := t.selection[0]
+	end := t.selection[1]
+	if start.GreaterThan(end) {
+		start, end = end, start
+	}
+	var ret string
+	var l Loc
+	for y := start.Y; y <= end.Y; y++ {
+		for x := 0; x < width; x++ {
+			l.X, l.Y = x, y
+			if l.GreaterEqual(start) && l.LessThan(end) {
+				c, _, _ := t.state.Cell(x, y)
+				ret += string(c)
+			}
+		}
+	}
+	return ret
 }
 
 // Start begins a new command in this terminal with a given view
@@ -41,6 +70,7 @@ func (t *Terminal) Start(execCmd []string, view *View) error {
 		for {
 			err := term.Parse()
 			if err != nil {
+				fmt.Fprintln(os.Stderr, "[Press enter to close]")
 				break
 			}
 			updateterm <- true
@@ -91,9 +121,10 @@ func (t *Terminal) Display(v *View) {
 	t.state.Lock()
 	defer t.state.Unlock()
 
+	var l Loc
 	for y := 0; y < v.Height; y++ {
 		for x := 0; x < v.Width; x++ {
-
+			l.X, l.Y = x, y
 			c, f, b := t.state.Cell(x, y)
 
 			fg, bg := int(f), int(b)
@@ -105,6 +136,10 @@ func (t *Terminal) Display(v *View) {
 			}
 			st := tcell.StyleDefault.Foreground(GetColor256(int(fg))).Background(GetColor256(int(bg)))
 
+			if l.LessThan(t.selection[1]) && l.GreaterEqual(t.selection[0]) || l.LessThan(t.selection[0]) && l.GreaterEqual(t.selection[1]) {
+				st = st.Reverse(true)
+			}
+
 			screen.SetContent(v.x+x+divider, v.y+y, c, nil, st)
 		}
 	}

cmd/micro/view.go

@@ -8,6 +8,7 @@ import (
 	"strings"
 	"time"
 
+	"github.com/zyedidia/clipboard"
 	"github.com/zyedidia/tcell"
 	"github.com/zyedidia/terminal"
 )
@@ -534,15 +535,48 @@ func (v *View) SetCursor(c *Cursor) bool {
 // HandleEvent handles an event passed by the main loop
 func (v *View) HandleEvent(event tcell.Event) {
 	if v.Type == vtTerm {
-		if e, ok := event.(*tcell.EventKey); ok && v.term.status == VTDone {
-			switch e.Key() {
-			case tcell.KeyEscape, tcell.KeyCtrlQ, tcell.KeyEnter:
-				v.term.Close()
-				v.Type = vtDefault
-			default:
+		if e, ok := event.(*tcell.EventKey); ok {
+			if v.term.status == VTDone {
+				switch e.Key() {
+				case tcell.KeyEscape, tcell.KeyCtrlQ, tcell.KeyEnter:
+					v.term.Close()
+					v.Type = vtDefault
+				default:
+				}
 			}
-		} else if _, ok := event.(*tcell.EventMouse); !ok || v.term.state.Mode(terminal.ModeMouseMask) {
+			if e.Key() == tcell.KeyCtrlC && v.term.HasSelection() {
+				clipboard.WriteAll(v.term.GetSelection(v.Width), "clipboard")
+				messenger.Message("Copied selection to clipboard")
+			} else if v.term.status != VTDone {
+				v.term.WriteString(event.EscSeq())
+			}
+		} else if e, ok := event.(*tcell.EventMouse); !ok || v.term.state.Mode(terminal.ModeMouseMask) {
 			v.term.WriteString(event.EscSeq())
+		} else {
+			x, y := e.Position()
+			x -= v.x
+			y += v.y
+
+			if e.Buttons() == tcell.Button1 {
+				if !v.mouseReleased {
+					// drag
+					v.term.selection[1].X = x
+					v.term.selection[1].Y = y
+				} else {
+					v.term.selection[0].X = x
+					v.term.selection[0].Y = y
+					v.term.selection[1].X = x
+					v.term.selection[1].Y = y
+				}
+
+				v.mouseReleased = false
+			} else if e.Buttons() == tcell.ButtonNone {
+				if !v.mouseReleased {
+					v.term.selection[1].X = x
+					v.term.selection[1].Y = y
+				}
+				v.mouseReleased = true
+			}
 		}
 		return
 	}