Implement liquid includes

dynamic_page.go

@@ -129,8 +129,8 @@ func (p *DynamicPage) DebugVariables() VariableMap {
 
 // Write applies Liquid and Markdown, as appropriate.
 func (p *DynamicPage) Write(w io.Writer) (err error) {
-	p.site.ConfigureLiquid()
-	body, err := helpers.ParseAndApplyTemplate(p.Content, p.TemplateVariables())
+	config := p.site.LiquidConfiguration()
+	body, err := helpers.ParseAndApplyTemplate(p.Content, p.TemplateVariables(), config)
 	if err != nil {
 		err = &os.PathError{Op: "Liquid Error", Path: p.Source(), Err: err}
 		return
@@ -138,7 +138,7 @@ func (p *DynamicPage) Write(w io.Writer) (err error) {
 
 	if p.Site().IsMarkdown(p.relpath) {
 		body = blackfriday.MarkdownCommon(body)
-		body, err = p.applyLayout(p.frontMatter, body)
+		body, err = p.applyLayout(p.frontMatter, body, config)
 		if err != nil {
 			return
 		}

helpers/liquid.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 
 	"github.com/acstech/liquid"
+	"github.com/acstech/liquid/core"
 )
 
 // RenderTemplate is a wrapper around liquid template.Render that turns panics into errors
@@ -23,8 +24,8 @@ func RenderTemplate(template *liquid.Template, variables map[string]interface{})
 }
 
 // ParseAndApplyTemplate parses and then renders the template.
-func ParseAndApplyTemplate(bs []byte, variables map[string]interface{}) ([]byte, error) {
-	template, err := liquid.Parse(bs, nil)
+func ParseAndApplyTemplate(bs []byte, variables map[string]interface{}, config *core.Configuration) ([]byte, error) {
+	template, err := liquid.Parse(bs, config)
 	if err != nil {
 		return nil, err
 	}

layout.go

@@ -10,6 +10,7 @@ import (
 	"github.com/osteele/gojekyll/helpers"
 
 	"github.com/acstech/liquid"
+	"github.com/acstech/liquid/core"
 )
 
 // FindLayout returns a template for the named layout.
@@ -42,10 +43,10 @@ func (s *Site) FindLayout(base string, fm *VariableMap) (t *liquid.Template, err
 	if err != nil {
 		return
 	}
-	return liquid.Parse(content, nil)
+	return liquid.Parse(content, s.LiquidConfiguration())
 }
 
-func (p *DynamicPage) applyLayout(frontMatter VariableMap, body []byte) ([]byte, error) {
+func (p *DynamicPage) applyLayout(frontMatter VariableMap, body []byte, config *core.Configuration) ([]byte, error) {
 	for {
 		layoutName := frontMatter.String("layout", "")
 		if layoutName == "" {

site.go

@@ -1,14 +1,18 @@
 package main
 
 import (
+	"io"
 	"io/ioutil"
 	"os"
+	"path"
 	"path/filepath"
 	"strings"
 	"time"
 
+	"github.com/acstech/liquid"
+	"github.com/acstech/liquid/core"
 	"github.com/osteele/gojekyll/helpers"
-	"github.com/osteele/gojekyll/liquid"
+	liquidHelper "github.com/osteele/gojekyll/liquid"
 )
 
 // Site is a Jekyll site.
@@ -21,8 +25,9 @@ type Site struct {
 	Variables   VariableMap
 	Paths       map[string]Page // URL path -> Page
 
-	config      SiteConfig
-	sassTempDir string
+	config              SiteConfig
+	liquidConfiguration *core.Configuration
+	sassTempDir         string
 }
 
 // NewSite creates a new site record, initialized with the site defaults.
@@ -100,11 +105,14 @@ func (s *Site) LayoutsDir() string {
 func (s *Site) ReadFiles() error {
 	s.Paths = make(map[string]Page)
 
+	walkFn := func(name string, info os.FileInfo, err error) error {
 		if err != nil {
 			return err
 		}
 
+		relname, err := filepath.Rel(s.Source, name)
 		if err != nil {
+			panic(err)
 		}
 		switch {
 		case info.IsDir() && s.Exclude(relname):
@@ -112,6 +120,8 @@ func (s *Site) ReadFiles() error {
 		case info.IsDir(), s.Exclude(relname):
 			return nil
 		}
+		defaults := s.GetFrontMatterDefaults(relname, "")
+		p, err := ReadPage(s, nil, relname, defaults)
 		if err != nil {
 			return err
 		}
@@ -141,8 +151,25 @@ func (s *Site) initTemplateAttributes() {
 	}
 }
 
-func (s *Site) ConfigureLiquid() {
-	liquid.SetFilePathURLGetter(s.GetFileURL)
+// LiquidConfiguration configures the liquid tags with site-specific behavior.
+func (s *Site) LiquidConfiguration() *core.Configuration {
+	if s.liquidConfiguration != nil {
+		return s.liquidConfiguration
+	}
+	liquidHelper.SetFilePathURLGetter(s.GetFileURL)
+	includeHandler := func(name string, writer io.Writer, data map[string]interface{}) {
+		name = strings.TrimLeft(strings.TrimRight(name, "}}"), "{{")
+		filename := path.Join(s.Source, s.config.IncludesDir, name)
+		template, err := liquid.ParseFile(filename, s.liquidConfiguration)
+		if err != nil {
+			panic(err)
+		}
+		template.Render(writer, data)
+	}
+	s.liquidConfiguration = liquid.Configure().IncludeHandler(includeHandler)
+	return s.liquidConfiguration
+}
+
 // GetFrontMatterDefaults implements https://jekyllrb.com/docs/configuration/#front-matter-defaults
 func (s *Site) GetFrontMatterDefaults(relpath, typename string) (m VariableMap) {
 	for _, entry := range s.config.Defaults {

site_config.go

@@ -9,6 +9,7 @@ type SiteConfig struct {
 	Source      string
 	Destination string
 	LayoutsDir  string `yaml:"layouts_dir"`
+	IncludesDir string `yaml:"includes_dir"`
 	Collections map[string]VariableMap
 
 	// Handling Reading