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/link.go

@@ -0,0 +1,78 @@
+package ansi
+
+import (
+	"io"
+	"net/url"
+)
+
+// A LinkElement is used to render hyperlinks.
+type LinkElement struct {
+	Text    string
+	BaseURL string
+	URL     string
+	Child   ElementRenderer // FIXME
+}
+
+func (e *LinkElement) Render(w io.Writer, ctx RenderContext) error {
+	var textRendered bool
+	if len(e.Text) > 0 && e.Text != e.URL {
+		textRendered = true
+
+		el := &BaseElement{
+			Token: e.Text,
+			Style: ctx.options.Styles.LinkText,
+		}
+		err := el.Render(w, ctx)
+		if err != nil {
+			return err
+		}
+	}
+
+	/*
+		if node.LastChild != nil {
+			if node.LastChild.Type == bf.Image {
+				el := tr.NewElement(node.LastChild)
+				err := el.Renderer.Render(w, node.LastChild, tr)
+				if err != nil {
+					return err
+				}
+			}
+			if len(node.LastChild.Literal) > 0 &&
+				string(node.LastChild.Literal) != string(node.LinkData.Destination) {
+				textRendered = true
+				el := &BaseElement{
+					Token: string(node.LastChild.Literal),
+					Style: ctx.style[LinkText],
+				}
+				err := el.Render(w, node.LastChild, tr)
+				if err != nil {
+					return err
+				}
+			}
+		}
+	*/
+
+	u, err := url.Parse(e.URL)
+	if err == nil &&
+		"#"+u.Fragment != e.URL { // if the URL only consists of an anchor, ignore it
+		pre := " "
+		style := ctx.options.Styles.Link
+		if !textRendered {
+			pre = ""
+			style.BlockPrefix = ""
+			style.BlockSuffix = ""
+		}
+
+		el := &BaseElement{
+			Token:  resolveRelativeURL(e.BaseURL, e.URL),
+			Prefix: pre,
+			Style:  style,
+		}
+		err := el.Render(w, ctx)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}