hugo genchromastyles 源码

2022-10-23
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hugo genchromastyles 代码

文件路径：/commands/genchromastyles.go

// Copyright 2017-present The Hugo Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package commands

import (
	"os"

	"github.com/alecthomas/chroma/v2"
	"github.com/alecthomas/chroma/v2/formatters/html"
	"github.com/alecthomas/chroma/v2/styles"
	"github.com/spf13/cobra"
)

var _ cmder = (*genChromaStyles)(nil)

type genChromaStyles struct {
	style          string
	highlightStyle string
	linesStyle     string
	*baseCmd
}

// TODO(bep) highlight
func createGenChromaStyles() *genChromaStyles {
	g := &genChromaStyles{
		baseCmd: newBaseCmd(&cobra.Command{
			Use:   "chromastyles",
			Short: "Generate CSS stylesheet for the Chroma code highlighter",
			Long: `Generate CSS stylesheet for the Chroma code highlighter for a given style. This stylesheet is needed if markup.highlight.noClasses is disabled in config.

See https://xyproto.github.io/splash/docs/all.html for a preview of the available styles`,
		}),
	}

	g.cmd.RunE = func(cmd *cobra.Command, args []string) error {
		return g.generate()
	}

	g.cmd.PersistentFlags().StringVar(&g.style, "style", "friendly", "highlighter style (see https://xyproto.github.io/splash/docs/)")
	g.cmd.PersistentFlags().StringVar(&g.highlightStyle, "highlightStyle", "bg:#ffffcc", "style used for highlighting lines (see https://github.com/alecthomas/chroma)")
	g.cmd.PersistentFlags().StringVar(&g.linesStyle, "linesStyle", "", "style used for line numbers (see https://github.com/alecthomas/chroma)")

	return g
}

func (g *genChromaStyles) generate() error {
	builder := styles.Get(g.style).Builder()
	if g.highlightStyle != "" {
		builder.Add(chroma.LineHighlight, g.highlightStyle)
	}
	if g.linesStyle != "" {
		builder.Add(chroma.LineNumbers, g.linesStyle)
	}
	style, err := builder.Build()
	if err != nil {
		return err
	}
	formatter := html.New(html.WithAllClasses(true))
	formatter.WriteCSS(os.Stdout, style)
	return nil
}

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本文标签： golang
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