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// 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"
"github.com/alecthomas/chroma/formatters/html"
"github.com/alecthomas/chroma/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 pygmentsUseClasses is enabled in config.
See https://help.farbox.com/pygments.html for preview of 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://help.farbox.com/pygments.html)")
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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