70 lines
1.8 KiB
Go
70 lines
1.8 KiB
Go
package markdown
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import "fmt"
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import "bytes"
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import "strings"
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import "html/template"
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import "github.com/yuin/goldmark"
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import "github.com/yuin/goldmark/parser"
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import "github.com/yuin/goldmark/renderer"
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import "github.com/yuin/goldmark/extension"
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import "git.tebibyte.media/sashakoshka/step"
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import "github.com/yuin/goldmark/renderer/html"
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var _ step.FuncProvider = new(Provider)
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// Provider provides Markdown functions.
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type Provider struct {
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Extensions []goldmark.Extender
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ParserOptions []parser.Option
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RendererOptions []renderer.Option
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}
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// Default returns a provider with the default configuration.
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func Default () *Provider {
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return &Provider {
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Extensions: []goldmark.Extender { extension.GFM },
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ParserOptions: []parser.Option { parser.WithAutoHeadingID() },
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RendererOptions: []renderer.Option {
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html.WithXHTML(),
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html.WithUnsafe(),
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},
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}
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}
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// FuncMap fulfills the step.FuncProvider interface.
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func (this *Provider) FuncMap () template.FuncMap {
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stat := &state {
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md: goldmark.New (
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goldmark.WithExtensions(this.Extensions...),
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goldmark.WithParserOptions(this.ParserOptions...),
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goldmark.WithRendererOptions(this.RendererOptions...)),
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}
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return template.FuncMap {
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"markdown": stat.funcMarkdown,
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}
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}
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type state struct {
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md goldmark.Markdown
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}
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func (this *state) funcMarkdown (input any) (template.HTML, error) {
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builder := strings.Builder { }
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err := this.md.Convert(toBytes(input), &builder)
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if err != nil { return "", nil }
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return template.HTML(builder.String()), nil
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}
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func toBytes (data any) []byte {
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switch data := data.(type) {
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case []byte: return data
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case string: return []byte(data)
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case template.HTML: return []byte(data)
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default:
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buffer := bytes.Buffer { }
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fmt.Fprint(&buffer, data)
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return buffer.Bytes()
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}
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}
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