Use glamour and termev to render/colorize content (#181)

Merge branch 'master' into use-glamour

select Glamour Theme based on BackgroundColor

Merge branch 'master' into use-glamour

Merge branch 'master' into use-glamour

update termev

update go.mod

label color colorate

use glamour for issue content

Vendor: Add glamour

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>
Co-authored-by: 6543 <6543@obermui.de>
Reviewed-on: https://gitea.com/gitea/tea/pulls/181
Reviewed-by: techknowlogick <techknowlogick@gitea.io>
Reviewed-by: Lunny Xiao <xiaolunwen@gmail.com>

vendor/github.com/charmbracelet/glamour/ansi/heading.go

@@ -0,0 +1,86 @@
+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
+}
+
+func (e *HeadingElement) Render(w io.Writer, ctx RenderContext) error {
+	bs := ctx.blockStack
+	rules := ctx.options.Styles.Heading
+
+	switch e.Level {
+	case 1:
+		rules = cascadeStyles(true, rules, ctx.options.Styles.H1)
+	case 2:
+		rules = cascadeStyles(true, rules, ctx.options.Styles.H2)
+	case 3:
+		rules = cascadeStyles(true, rules, ctx.options.Styles.H3)
+	case 4:
+		rules = cascadeStyles(true, rules, ctx.options.Styles.H4)
+	case 5:
+		rules = cascadeStyles(true, rules, ctx.options.Styles.H5)
+	case 6:
+		rules = cascadeStyles(true, 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
+}