ctrl+k cuts line into clipboard, ctrl+c clears clipboard if no selection

[aerth]

ctrl+k cut multiple lines into clipboard

[aerth]

This causes a panic when deleting nonexistent lines.

[zyedidia]

I think that was actually a bug with SelectLine, see 0fac02c.

[aerth]

0fac02c didn't fix it. I build, open it up, and press ctrl+k and it dumps this:

Micro encountered an error: Operation not permitted on empty rope
*errors.errorString Operation not permitted on empty rope
/usr/local/go/src/runtime/panic.go:443 (0x45e5a9)
    gopanic: reflectcall(nil, unsafe.Pointer(d.fn), deferArgs(d), uint32(d.siz), uint32(d.siz))
/home/test/goforc/src/github.com/vinzmay/go-rope/rope.go:27 (0x48f99e)
    (*Rope).panicIfNil: panic(fmt.Sprintf("Operation not permitted on empty rope"))
/home/test/goforc/src/github.com/vinzmay/go-rope/rope.go:165 (0x4908ec)
    (*Rope).Split: rope.panicIfNil()
/home/test/goforc/src/github.com/vinzmay/go-rope/rope.go:190 (0x490ed2)
    (*Rope).Delete: _, r4 := r2.Split(length)
/home/test/goforc/src/github.com/aerth/micro/cmd/micro/buffer.go:124 (0x40180b)
    (*Buffer).Remove: b.r = b.r.Delete(start, end-start)
/home/test/goforc/src/github.com/aerth/micro/cmd/micro/eventhandler.go:33 (0x4072c1)
    ExecuteTextEvent: t.text = t.buf.Remove(t.start, t.end)
/home/test/goforc/src/github.com/aerth/micro/cmd/micro/eventhandler.go:98 (0x40781f)
    (*EventHandler).Execute: ExecuteTextEvent(t)
/home/test/goforc/src/github.com/aerth/micro/cmd/micro/eventhandler.go:83 (0x40763a)
    (*EventHandler).Remove: eh.Execute(e)
/home/test/goforc/src/github.com/aerth/micro/cmd/micro/cursor.go:95 (0x405749)
    (*Cursor).DeleteSelection: c.v.eh.Remove(c.curSelection[0], c.curSelection[1])
/home/test/goforc/src/github.com/aerth/micro/cmd/micro/view.go:553 (0x4299c9)
    (*View).HandleEvent: v.cursor.DeleteSelection()
/home/test/goforc/src/github.com/aerth/micro/cmd/micro/micro.go:256 (0x40ea25)
    main: view.HandleEvent(event)
/usr/local/go/src/runtime/proc.go:188 (0x4600c0)
    main: main_main()
/usr/local/go/src/runtime/asm_amd64.s:1998 (0x48e821)
    goexit: BYTE    $0x90   // NOP

[aerth]

https://github.com/vinzmay/go-rope/blob/d4b1498b37c3ff4b9a37bfd3d4a7ad800dfc6d1f/rope.go#L24

using Go 1.6.2