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package ansi
import (
"bytes"
"io"
"github.com/muesli/reflow/indent"
"github.com/muesli/reflow/wordwrap"
)
// A HeadingElement is used to render headings.
type HeadingElement struct {
Level int
First bool
}
const (
h1 = iota + 1
h2
h3
h4
h5
h6
)
func (e *HeadingElement) Render(w io.Writer, ctx RenderContext) error {
bs := ctx.blockStack
rules := ctx.options.Styles.Heading
switch e.Level {
case h1:
rules = cascadeStyles(rules, ctx.options.Styles.H1)
case h2:
rules = cascadeStyles(rules, ctx.options.Styles.H2)
case h3:
rules = cascadeStyles(rules, ctx.options.Styles.H3)
case h4:
rules = cascadeStyles(rules, ctx.options.Styles.H4)
case h5:
rules = cascadeStyles(rules, ctx.options.Styles.H5)
case h6:
rules = cascadeStyles(rules, ctx.options.Styles.H6)
}
if !e.First {
renderText(w, ctx.options.ColorProfile, bs.Current().Style.StylePrimitive, "\n")
}
be := BlockElement{
Block: &bytes.Buffer{},
Style: cascadeStyle(bs.Current().Style, rules, false),
}
bs.Push(be)
renderText(w, ctx.options.ColorProfile, bs.Parent().Style.StylePrimitive, rules.BlockPrefix)
renderText(bs.Current().Block, ctx.options.ColorProfile, bs.Current().Style.StylePrimitive, rules.Prefix)
return nil
}
func (e *HeadingElement) Finish(w io.Writer, ctx RenderContext) error {
bs := ctx.blockStack
rules := bs.Current().Style
var indentation uint
var margin uint
if rules.Indent != nil {
indentation = *rules.Indent
}
if rules.Margin != nil {
margin = *rules.Margin
}
iw := indent.NewWriterPipe(w, indentation+margin, func(wr io.Writer) {
renderText(w, ctx.options.ColorProfile, bs.Parent().Style.StylePrimitive, " ")
})
flow := wordwrap.NewWriter(int(bs.Width(ctx) - indentation - margin*2))
_, err := flow.Write(bs.Current().Block.Bytes())
if err != nil {
return err
}
flow.Close()
_, err = iw.Write(flow.Bytes())
if err != nil {
return err
}
renderText(w, ctx.options.ColorProfile, bs.Current().Style.StylePrimitive, rules.Suffix)
renderText(w, ctx.options.ColorProfile, bs.Parent().Style.StylePrimitive, rules.BlockSuffix)
bs.Current().Block.Reset()
bs.Pop()
return nil
}
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