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102 lines
2.8 KiB
Go
102 lines
2.8 KiB
Go
package pipelines
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import (
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"io"
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"path/filepath"
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"github.com/osteele/gojekyll/config"
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"github.com/osteele/gojekyll/filters"
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"github.com/osteele/gojekyll/tags"
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"github.com/osteele/gojekyll/utils"
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"github.com/osteele/liquid"
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)
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// PipelineInterface applies transformations to a document.
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type PipelineInterface interface {
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ApplyLayout(string, []byte, liquid.Bindings) ([]byte, error)
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OutputExt(pathname string) string
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Render(io.Writer, []byte, liquid.Bindings, string, int) error
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RenderTemplate([]byte, liquid.Bindings, string, int) ([]byte, error)
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}
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// Pipeline applies a rendering transformation to a file.
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type Pipeline struct {
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PipelineOptions
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cfg config.Config
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liquidEngine *liquid.Engine
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sassTempDir string
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sassHash string
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}
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// PipelineOptions configures a pipeline.
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type PipelineOptions struct {
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RelativeFilenameToURL tags.LinkTagHandler
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ThemeDir string
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}
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// NewPipeline makes a rendering pipeline.
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func NewPipeline(c config.Config, options PipelineOptions) (*Pipeline, error) {
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p := Pipeline{PipelineOptions: options, cfg: c}
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p.liquidEngine = p.makeLiquidEngine()
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if err := p.CopySassFileIncludes(); err != nil {
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return nil, err
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}
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return &p, nil
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}
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// sourceDir returns the site source directory. Seeing how far we can bend
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// the Law of Demeter.
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func (p *Pipeline) sourceDir() string {
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return p.cfg.Source
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}
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// TemplateEngine returns the Liquid engine.
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func (p *Pipeline) TemplateEngine() *liquid.Engine {
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return p.liquidEngine
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}
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// OutputExt returns the output extension.
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func (p *Pipeline) OutputExt(pathname string) string {
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return p.cfg.OutputExt(pathname)
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}
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// Render sends content through SASS and/or Liquid -> Markdown
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func (p *Pipeline) Render(w io.Writer, src []byte, vars liquid.Bindings, filename string, lineNo int) error {
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if p.cfg.IsSASSPath(filename) {
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return p.WriteSass(w, src)
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}
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src, err := p.RenderTemplate(src, vars, filename, lineNo)
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if err != nil {
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return err
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}
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if p.cfg.IsMarkdown(filename) {
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src = markdownRenderer(src)
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}
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_, err = w.Write(src)
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return err
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}
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// RenderTemplate renders a Liquid template
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func (p *Pipeline) RenderTemplate(src []byte, vars liquid.Bindings, filename string, lineNo int) ([]byte, error) {
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tpl, err := p.liquidEngine.ParseTemplateLocation(src, filename, lineNo)
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if err != nil {
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return nil, utils.WrapPathError(err, filename)
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}
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out, err := tpl.Render(vars)
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if err != nil {
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return nil, utils.WrapPathError(err, filename)
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}
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return out, err
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}
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func (p *Pipeline) makeLiquidEngine() *liquid.Engine {
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dirs := []string{filepath.Join(p.cfg.Source, p.cfg.IncludesDir)}
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if p.ThemeDir != "" {
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dirs = append(dirs, filepath.Join(p.ThemeDir, "_includes"))
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}
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engine := liquid.NewEngine()
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filters.AddJekyllFilters(engine, &p.cfg)
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tags.AddJekyllTags(engine, &p.cfg, dirs, p.RelativeFilenameToURL)
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return engine
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}
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