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/baseelement.go

@@ -0,0 +1,104 @@
+package ansi
+
+import (
+	"bytes"
+	"io"
+	"text/template"
+
+	"github.com/muesli/termenv"
+)
+
+// BaseElement renders a styled primitive element.
+type BaseElement struct {
+	Token  string
+	Prefix string
+	Suffix string
+	Style  StylePrimitive
+}
+
+func formatToken(format string, token string) (string, error) {
+	var b bytes.Buffer
+
+	v := make(map[string]interface{})
+	v["text"] = token
+
+	tmpl, err := template.New(format).Funcs(TemplateFuncMap).Parse(format)
+	if err != nil {
+		return "", err
+	}
+
+	err = tmpl.Execute(&b, v)
+	return b.String(), err
+}
+
+func renderText(w io.Writer, p termenv.Profile, rules StylePrimitive, s string) {
+	if len(s) == 0 {
+		return
+	}
+
+	out := termenv.String(s)
+
+	if rules.Color != nil {
+		out = out.Foreground(p.Color(*rules.Color))
+	}
+	if rules.BackgroundColor != nil {
+		out = out.Background(p.Color(*rules.BackgroundColor))
+	}
+
+	if rules.Underline != nil && *rules.Underline {
+		out = out.Underline()
+	}
+	if rules.Bold != nil && *rules.Bold {
+		out = out.Bold()
+	}
+	if rules.Italic != nil && *rules.Italic {
+		out = out.Italic()
+	}
+	if rules.CrossedOut != nil && *rules.CrossedOut {
+		out = out.CrossOut()
+	}
+	if rules.Overlined != nil && *rules.Overlined {
+		out = out.Overline()
+	}
+	if rules.Inverse != nil && *rules.Inverse {
+		out = out.Reverse()
+	}
+	if rules.Blink != nil && *rules.Blink {
+		out = out.Blink()
+	}
+
+	_, _ = w.Write([]byte(out.String()))
+}
+
+func (e *BaseElement) Render(w io.Writer, ctx RenderContext) error {
+	bs := ctx.blockStack
+
+	renderText(w, ctx.options.ColorProfile, bs.Current().Style.StylePrimitive, e.Prefix)
+	defer func() {
+		renderText(w, ctx.options.ColorProfile, bs.Current().Style.StylePrimitive, e.Suffix)
+	}()
+
+	rules := bs.With(e.Style)
+	// render unstyled prefix/suffix
+	renderText(w, ctx.options.ColorProfile, bs.Current().Style.StylePrimitive, rules.BlockPrefix)
+	defer func() {
+		renderText(w, ctx.options.ColorProfile, bs.Current().Style.StylePrimitive, rules.BlockSuffix)
+	}()
+
+	// render styled prefix/suffix
+	renderText(w, ctx.options.ColorProfile, rules, rules.Prefix)
+	defer func() {
+		renderText(w, ctx.options.ColorProfile, rules, rules.Suffix)
+	}()
+
+	s := e.Token
+	if len(rules.Format) > 0 {
+		var err error
+		s, err = formatToken(rules.Format, s)
+		if err != nil {
+			return err
+		}
+	}
+	renderText(w, ctx.options.ColorProfile, rules, s)
+	return nil
+}