// loop through slides with a pause
func loop(filename string, w, h, slidenum int, n time.Duration) {
openvg.SaveTerm()
defer openvg.RestoreTerm()
var d deck.Deck
var err error
d, err = deck.Read(filename, w, h)
if err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
return
}
openvg.RawTerm()
r := bufio.NewReader(os.Stdin)
imap := make(map[string]image.Image)
loadimage(d, imap)
var start int
var sd time.Duration
for pass := 0; ; pass++ {
if pass == 0 {
start = slidenum
} else {
start = 0
}
for i := start; i < len(d.Slide); i++ {
if readcmd(r) == 'q' {
return
}
showslide(d, imap, i)
pd, err := time.ParseDuration(d.Slide[i].Duration)
if err != nil {
sd = n
} else {
sd = pd
}
time.Sleep(sd)
}
}
}
// interact controls the display of the deck
func interact(filename, searchterm string, w, h, slidenum int, gp float64) {
openvg.SaveTerm()
defer openvg.RestoreTerm()
var d deck.Deck
var err error
d, err = deck.Read(filename, w, h)
if err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
return
}
openvg.RawTerm()
r := bufio.NewReader(os.Stdin)
lastslide := len(d.Slide) - 1
if slidenum > lastslide {
slidenum = lastslide
}
if slidenum < 0 {
slidenum = 0
}
if len(searchterm) > 0 {
sr := deck.Search(d, searchterm)
if sr >= 0 {
slidenum = sr
}
}
n := slidenum
xray := 1
initial := 0
imap := make(map[string]image.Image)
// respond to keyboard commands, 'q' to exit
for cmd := byte('0'); cmd != 'q'; cmd = readcmd(r) {
switch cmd {
// read/reload
case 'r', 18: // r, Ctrl-R
d, err = deck.Read(filename, w, h)
if err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
return
}
loadimage(d, imap)
openvg.Background(0, 0, 0)
xray = 1
showslide(d, imap, n)
// save slide
case 's', 19: // s, Ctrl-S
openvg.SaveEnd(fmt.Sprintf("%s-slide-%04d", filename, n))
// first slide
case '0', '1', 1, '^': // 0,1,Ctrl-A,^
initial++
if initial == 1 {
loadimage(d, imap)
n = slidenum
} else {
n = 0
}
showslide(d, imap, n)
// last slide
case '*', 5, '$': // *, Crtl-E, $
n = lastslide
showslide(d, imap, n)
// next slide
case '+', 'n', '\n', ' ', '\t', '=', 14: // +,n,newline,space,tab,equal,Crtl-N
n++
if n > lastslide {
n = 0
}
showslide(d, imap, n)
// previous slide
case '-', 'p', 8, 16, 127: // -,p,Backspace,Ctrl-P,Del
n--
if n < 0 {
n = lastslide
}
showslide(d, imap, n)
// x-ray
case 'x', 24: // x, Ctrl-X
xray++
showslide(d, imap, n)
if xray%2 == 0 {
showgrid(d, n, gp)
}
// Escape sequence from remotes
case 27:
remote, rerr := r.ReadString('~')
if len(remote) > 2 && rerr == nil {
switch remote[1] {
case '3': // blank screen
openvg.Start(d.Canvas.Width, d.Canvas.Height)
openvg.FillColor("black")
openvg.Rect(0, 0, openvg.VGfloat(d.Canvas.Width), openvg.VGfloat(d.Canvas.Height))
openvg.End()
case '5': // back
n--
if n < 0 {
n = lastslide
}
showslide(d, imap, n)
case '6': // forward
n++
if n > lastslide {
n = 0
}
showslide(d, imap, n)
}
}
// search
case '/', 6: // slash, Ctrl-F
openvg.RestoreTerm()
searchterm, serr := r.ReadString('\n')
openvg.RawTerm()
if serr != nil {
continue
}
if len(searchterm) > 2 {
ns := deck.Search(d, searchterm[0:len(searchterm)-1])
if ns >= 0 {
showslide(d, imap, ns)
n = ns
}
}
}
}
}