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/codeblock.go

@@ -0,0 +1,125 @@
+package ansi
+
+import (
+	"io"
+
+	"github.com/alecthomas/chroma"
+	"github.com/alecthomas/chroma/quick"
+	"github.com/alecthomas/chroma/styles"
+	"github.com/muesli/reflow/indent"
+)
+
+// A CodeBlockElement is used to render code blocks.
+type CodeBlockElement struct {
+	Code     string
+	Language string
+}
+
+func chromaStyle(style StylePrimitive) string {
+	var s string
+
+	if style.Color != nil {
+		s = *style.Color
+	}
+	if style.BackgroundColor != nil {
+		if s != "" {
+			s += " "
+		}
+		s += "bg:" + *style.BackgroundColor
+	}
+	if style.Italic != nil && *style.Italic {
+		if s != "" {
+			s += " "
+		}
+		s += "italic"
+	}
+	if style.Bold != nil && *style.Bold {
+		if s != "" {
+			s += " "
+		}
+		s += "bold"
+	}
+	if style.Underline != nil && *style.Underline {
+		if s != "" {
+			s += " "
+		}
+		s += "underline"
+	}
+
+	return s
+}
+
+func (e *CodeBlockElement) Render(w io.Writer, ctx RenderContext) error {
+	bs := ctx.blockStack
+
+	var indentation uint
+	var margin uint
+	rules := ctx.options.Styles.CodeBlock
+	if rules.Indent != nil {
+		indentation = *rules.Indent
+	}
+	if rules.Margin != nil {
+		margin = *rules.Margin
+	}
+	theme := rules.Theme
+
+	if rules.Chroma != nil && ctx.options.ColorProfile > 1 {
+		theme = "charm"
+		styles.Register(chroma.MustNewStyle("charm",
+			chroma.StyleEntries{
+				chroma.Text:                chromaStyle(rules.Chroma.Text),
+				chroma.Error:               chromaStyle(rules.Chroma.Error),
+				chroma.Comment:             chromaStyle(rules.Chroma.Comment),
+				chroma.CommentPreproc:      chromaStyle(rules.Chroma.CommentPreproc),
+				chroma.Keyword:             chromaStyle(rules.Chroma.Keyword),
+				chroma.KeywordReserved:     chromaStyle(rules.Chroma.KeywordReserved),
+				chroma.KeywordNamespace:    chromaStyle(rules.Chroma.KeywordNamespace),
+				chroma.KeywordType:         chromaStyle(rules.Chroma.KeywordType),
+				chroma.Operator:            chromaStyle(rules.Chroma.Operator),
+				chroma.Punctuation:         chromaStyle(rules.Chroma.Punctuation),
+				chroma.Name:                chromaStyle(rules.Chroma.Name),
+				chroma.NameBuiltin:         chromaStyle(rules.Chroma.NameBuiltin),
+				chroma.NameTag:             chromaStyle(rules.Chroma.NameTag),
+				chroma.NameAttribute:       chromaStyle(rules.Chroma.NameAttribute),
+				chroma.NameClass:           chromaStyle(rules.Chroma.NameClass),
+				chroma.NameConstant:        chromaStyle(rules.Chroma.NameConstant),
+				chroma.NameDecorator:       chromaStyle(rules.Chroma.NameDecorator),
+				chroma.NameException:       chromaStyle(rules.Chroma.NameException),
+				chroma.NameFunction:        chromaStyle(rules.Chroma.NameFunction),
+				chroma.NameOther:           chromaStyle(rules.Chroma.NameOther),
+				chroma.Literal:             chromaStyle(rules.Chroma.Literal),
+				chroma.LiteralNumber:       chromaStyle(rules.Chroma.LiteralNumber),
+				chroma.LiteralDate:         chromaStyle(rules.Chroma.LiteralDate),
+				chroma.LiteralString:       chromaStyle(rules.Chroma.LiteralString),
+				chroma.LiteralStringEscape: chromaStyle(rules.Chroma.LiteralStringEscape),
+				chroma.GenericDeleted:      chromaStyle(rules.Chroma.GenericDeleted),
+				chroma.GenericEmph:         chromaStyle(rules.Chroma.GenericEmph),
+				chroma.GenericInserted:     chromaStyle(rules.Chroma.GenericInserted),
+				chroma.GenericStrong:       chromaStyle(rules.Chroma.GenericStrong),
+				chroma.GenericSubheading:   chromaStyle(rules.Chroma.GenericSubheading),
+				chroma.Background:          chromaStyle(rules.Chroma.Background),
+			}))
+	}
+
+	iw := indent.NewWriterPipe(w, indentation+margin, func(wr io.Writer) {
+		renderText(w, ctx.options.ColorProfile, bs.Current().Style.StylePrimitive, " ")
+	})
+
+	if len(theme) > 0 {
+		renderText(iw, ctx.options.ColorProfile, bs.Current().Style.StylePrimitive, rules.BlockPrefix)
+		err := quick.Highlight(iw, e.Code, e.Language, "terminal256", theme)
+		if err != nil {
+			return err
+		}
+		renderText(iw, ctx.options.ColorProfile, bs.Current().Style.StylePrimitive, rules.BlockSuffix)
+		return nil
+	}
+
+	// fallback rendering
+	el := &BaseElement{
+		Token: e.Code,
+		Style: rules.StylePrimitive,
+	}
+
+	return el.Render(iw, ctx)
+}