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package list
import (
"strings"
"unicode/utf8"
)
// Render renders the List in a human-readable "pretty" format. Example:
// * Game Of Thrones
// * Winter
// * Is
// * Coming
// * This
// * Is
// * Known
// * The Dark Tower
// * The Gunslinger
func (l *List) Render() string {
l.initForRender()
var out strings.Builder
out.Grow(l.approxSize)
for idx, item := range l.items {
hint := renderHint{
isTopItem: bool(idx == 0),
isFirstItem: bool(idx == 0 || item.Level > l.items[idx-1].Level),
isLastItem: !l.hasMoreItemsInLevel(item.Level, idx),
isBottomItem: bool(idx == len(l.items)-1),
}
if hint.isFirstItem && hint.isLastItem {
hint.isOnlyItem = true
}
l.renderItem(&out, idx, item, hint)
}
return l.render(&out)
}
func (l *List) renderItem(out *strings.Builder, idx int, item *listItem, hint renderHint) {
// when working on item number 2 or more, render a newline first
if idx > 0 {
out.WriteRune('\n')
}
// format item.Text as directed in l.style
itemStr := l.style.Format.Apply(item.Text)
// convert newlines if newlines are not "\n" in l.style
if strings.Contains(itemStr, "\n") && l.style.CharNewline != "\n" {
itemStr = strings.Replace(itemStr, "\n", l.style.CharNewline, -1)
}
// render the item.Text line by line
for lineIdx, lineStr := range strings.Split(itemStr, "\n") {
if lineIdx > 0 {
out.WriteRune('\n')
}
// render the prefix or the leading text before the actual item
l.renderItemBulletPrefix(out, idx, item.Level, lineIdx, hint)
l.renderItemBullet(out, idx, item.Level, lineIdx, hint)
// render the actual item
out.WriteString(lineStr)
}
}
func (l *List) renderItemBullet(out *strings.Builder, itemIdx int, itemLevel int, lineIdx int, hint renderHint) {
if lineIdx > 0 {
// multi-line item.Text
if hint.isLastItem {
out.WriteString(strings.Repeat(" ", utf8.RuneCountInString(l.style.CharItemVertical)))
} else {
out.WriteString(l.style.CharItemVertical)
}
} else {
// single-line item.Text (or first line of a multi-line item.Text)
if hint.isOnlyItem {
if hint.isTopItem {
out.WriteString(l.style.CharItemSingle)
} else {
out.WriteString(l.style.CharItemBottom)
}
} else if hint.isTopItem {
out.WriteString(l.style.CharItemTop)
} else if hint.isFirstItem {
out.WriteString(l.style.CharItemFirst)
} else if hint.isBottomItem || hint.isLastItem {
out.WriteString(l.style.CharItemBottom)
} else {
out.WriteString(l.style.CharItemMiddle)
}
out.WriteRune(' ')
}
}
func (l *List) renderItemBulletPrefix(out *strings.Builder, itemIdx int, itemLevel int, lineIdx int, hint renderHint) {
// write a prefix if one has been set in l.style
if l.style.LinePrefix != "" {
out.WriteString(l.style.LinePrefix)
}
// render spaces and connectors until the item's position
for levelIdx := 0; levelIdx < itemLevel; levelIdx++ {
if l.hasMoreItemsInLevel(levelIdx, itemIdx) {
out.WriteString(l.style.CharItemVertical)
} else {
out.WriteString(strings.Repeat(" ", utf8.RuneCountInString(l.style.CharItemVertical)))
}
}
}
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