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/margin.go

@@ -0,0 +1,52 @@
+package ansi
+
+import (
+	"io"
+
+	"github.com/muesli/reflow/indent"
+	"github.com/muesli/reflow/padding"
+)
+
+// MarginWriter is a Writer that applies indentation and padding around
+// whatever you write to it.
+type MarginWriter struct {
+	w  io.Writer
+	pw *padding.Writer
+	iw *indent.Writer
+}
+
+// NewMarginWriter returns a new MarginWriter.
+func NewMarginWriter(ctx RenderContext, w io.Writer, rules StyleBlock) *MarginWriter {
+	bs := ctx.blockStack
+
+	var indentation uint
+	var margin uint
+	if rules.Indent != nil {
+		indentation = *rules.Indent
+	}
+	if rules.Margin != nil {
+		margin = *rules.Margin
+	}
+
+	pw := padding.NewWriterPipe(w, bs.Width(ctx), func(wr io.Writer) {
+		renderText(w, ctx.options.ColorProfile, rules.StylePrimitive, " ")
+	})
+
+	ic := " "
+	if rules.IndentToken != nil {
+		ic = *rules.IndentToken
+	}
+	iw := indent.NewWriterPipe(pw, indentation+margin, func(wr io.Writer) {
+		renderText(w, ctx.options.ColorProfile, bs.Parent().Style.StylePrimitive, ic)
+	})
+
+	return &MarginWriter{
+		w:  w,
+		pw: pw,
+		iw: iw,
+	}
+}
+
+func (w *MarginWriter) Write(b []byte) (int, error) {
+	return w.iw.Write(b)
+}