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/muesli/termenv/templatehelper.go

@@ -0,0 +1,55 @@
+package termenv
+
+import (
+	"text/template"
+)
+
+// TemplateFuncs contains a few useful template helpers.
+func TemplateFuncs(p Profile) template.FuncMap {
+	return template.FuncMap{
+		"Color": func(values ...interface{}) string {
+			s := String(values[len(values)-1].(string))
+			switch len(values) {
+			case 2:
+				s = s.Foreground(p.Color(values[0].(string)))
+			case 3:
+				s = s.
+					Foreground(p.Color(values[0].(string))).
+					Background(p.Color(values[1].(string)))
+			}
+
+			return s.String()
+		},
+		"Foreground": func(values ...interface{}) string {
+			s := String(values[len(values)-1].(string))
+			if len(values) == 2 {
+				s = s.Foreground(p.Color(values[0].(string)))
+			}
+
+			return s.String()
+		},
+		"Background": func(values ...interface{}) string {
+			s := String(values[len(values)-1].(string))
+			if len(values) == 2 {
+				s = s.Background(p.Color(values[0].(string)))
+			}
+
+			return s.String()
+		},
+		"Bold":      styleFunc(Style.Bold),
+		"Faint":     styleFunc(Style.Faint),
+		"Italic":    styleFunc(Style.Italic),
+		"Underline": styleFunc(Style.Underline),
+		"Overline":  styleFunc(Style.Overline),
+		"Blink":     styleFunc(Style.Blink),
+		"Reverse":   styleFunc(Style.Reverse),
+		"CrossOut":  styleFunc(Style.CrossOut),
+	}
+}
+
+func styleFunc(f func(Style) Style) func(...interface{}) string {
+	return func(values ...interface{}) string {
+		s := String(values[0].(string))
+		return f(s).String()
+	}
+}