87 lines
2.1 KiB
Go
87 lines
2.1 KiB
Go
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package ansi
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import (
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"bytes"
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"io"
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"github.com/muesli/reflow/indent"
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"github.com/muesli/reflow/wordwrap"
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)
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// A HeadingElement is used to render headings.
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type HeadingElement struct {
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Level int
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First bool
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}
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func (e *HeadingElement) Render(w io.Writer, ctx RenderContext) error {
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bs := ctx.blockStack
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rules := ctx.options.Styles.Heading
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switch e.Level {
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case 1:
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rules = cascadeStyles(true, rules, ctx.options.Styles.H1)
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case 2:
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rules = cascadeStyles(true, rules, ctx.options.Styles.H2)
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case 3:
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rules = cascadeStyles(true, rules, ctx.options.Styles.H3)
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case 4:
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rules = cascadeStyles(true, rules, ctx.options.Styles.H4)
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case 5:
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rules = cascadeStyles(true, rules, ctx.options.Styles.H5)
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case 6:
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rules = cascadeStyles(true, rules, ctx.options.Styles.H6)
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}
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if !e.First {
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renderText(w, ctx.options.ColorProfile, bs.Current().Style.StylePrimitive, "\n")
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}
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be := BlockElement{
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Block: &bytes.Buffer{},
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Style: cascadeStyle(bs.Current().Style, rules, false),
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}
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bs.Push(be)
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renderText(w, ctx.options.ColorProfile, bs.Parent().Style.StylePrimitive, rules.BlockPrefix)
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renderText(bs.Current().Block, ctx.options.ColorProfile, bs.Current().Style.StylePrimitive, rules.Prefix)
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return nil
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}
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func (e *HeadingElement) Finish(w io.Writer, ctx RenderContext) error {
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bs := ctx.blockStack
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rules := bs.Current().Style
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var indentation uint
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var margin uint
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if rules.Indent != nil {
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indentation = *rules.Indent
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}
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if rules.Margin != nil {
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margin = *rules.Margin
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}
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iw := indent.NewWriterPipe(w, indentation+margin, func(wr io.Writer) {
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renderText(w, ctx.options.ColorProfile, bs.Parent().Style.StylePrimitive, " ")
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})
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flow := wordwrap.NewWriter(int(bs.Width(ctx) - indentation - margin*2))
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_, err := flow.Write(bs.Current().Block.Bytes())
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if err != nil {
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return err
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}
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flow.Close()
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_, err = iw.Write(flow.Bytes())
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if err != nil {
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return err
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}
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renderText(w, ctx.options.ColorProfile, bs.Current().Style.StylePrimitive, rules.Suffix)
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renderText(w, ctx.options.ColorProfile, bs.Parent().Style.StylePrimitive, rules.BlockSuffix)
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bs.Current().Block.Reset()
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bs.Pop()
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return nil
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}
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