func drawSide(g *gocui.Gui, side *gocui.View, filelist []string, fOffset int) {
side.Clear()
_, wheight := g.Size()
wheight = wheight - 2*Padding
if fOffset < window_offset {
window_offset = fOffset
} else if fOffset >= window_offset+wheight {
window_offset = fOffset - wheight + 1
}
end := wheight + window_offset
if len(filelist) < end {
end = len(filelist)
}
for i, name := range filelist {
if i < window_offset || i >= end {
continue
}
bname := filepath.Base(name)
if i == fOffset {
fmt.Fprintln(side, PrefixArrow+bname)
} else {
fmt.Fprintln(side, PrefixEmpty+bname)
}
}
}
func prevOne(g *gocui.Gui, v *gocui.View) error {
if lv := g.View("side"); lv != nil {
_, height := g.Size()
height = height - 2*Padding
length := len(files)
file_offset = (file_offset - 1 + length) % length
drawSide(g, lv, files, file_offset)
}
return nil
}
func layout(g *gocui.Gui) error {
maxX, maxY := g.Size()
if _, err := g.SetView("center", 0, 0, maxX*4/5, maxY-Padding); err != nil {
if err != gocui.ErrorUnkView {
return err
}
}
if v, err := g.SetView("side", maxX*4/5+1, 0, maxX-Padding, maxY-Padding); err != nil {
if err != gocui.ErrorUnkView {
return err
}
_, height := g.Size()
if height-2*Padding > len(files) {
height = len(files)
}
for i := 0; i < height; i++ {
name := filepath.Base(files[i])
if i == 0 {
fmt.Fprintln(v, PrefixArrow+name)
} else {
fmt.Fprintln(v, PrefixEmpty+name)
}
}
}
return nil
}
func drawCenter(g *gocui.Gui) {
if v := g.View("center"); v != nil {
_, height := g.Size()
height = height - 2
if text, err := TailFile(files[file_offset], height); err == nil {
if i := strings.Index(text, "\n"); i > 0 {
re := regexp.MustCompile("\\033[[0-9]+m")
line := re.ReplaceAllString(text[0:i], "")
text = line + text[i:]
} else {
re := regexp.MustCompile("\\033[[0-9]+m")
text = re.ReplaceAllString(text, "")
}
v.Clear()
fmt.Fprintf(v, "%s", text)
g.Flush()
} else {
v.Clear()
fmt.Fprintf(v, "------ failed to read from %s ------\n", filepath.Base(files[file_offset]))
g.Flush()
}
}
}