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/paragraph.go

@@ -0,0 +1,58 @@
+package ansi
+
+import (
+	"bytes"
+	"io"
+	"strings"
+
+	"github.com/muesli/reflow/wordwrap"
+)
+
+// A ParagraphElement is used to render individual paragraphs.
+type ParagraphElement struct {
+	First bool
+}
+
+func (e *ParagraphElement) Render(w io.Writer, ctx RenderContext) error {
+	bs := ctx.blockStack
+	rules := ctx.options.Styles.Paragraph
+
+	if !e.First {
+		_, _ = w.Write([]byte("\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 *ParagraphElement) Finish(w io.Writer, ctx RenderContext) error {
+	bs := ctx.blockStack
+	rules := bs.Current().Style
+
+	mw := NewMarginWriter(ctx, w, rules)
+	if len(strings.TrimSpace(bs.Current().Block.String())) > 0 {
+		flow := wordwrap.NewWriter(int(bs.Width(ctx)))
+		flow.KeepNewlines = false
+		_, _ = flow.Write(bs.Current().Block.Bytes())
+		flow.Close()
+
+		_, err := mw.Write(flow.Bytes())
+		if err != nil {
+			return err
+		}
+		_, _ = mw.Write([]byte("\n"))
+	}
+
+	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
+}