diff --git a/core/blog.go b/core/blog.go
index d3d8d17..b1b73f6 100644
--- a/core/blog.go
+++ b/core/blog.go
@@ -13,6 +13,7 @@ import (
 
 	"github.com/gorilla/feeds"
 	"github.com/gorilla/mux"
+	"github.com/kirsle/blog/core/internal/markdown"
 	"github.com/kirsle/blog/core/internal/models/comments"
 	"github.com/kirsle/blog/core/internal/models/posts"
 	"github.com/kirsle/blog/core/internal/models/settings"
@@ -439,7 +440,7 @@ func (b *Blog) RenderPost(p *posts.Post, indexView bool, numComments int) templa
 	// Render the post to HTML.
 	var rendered template.HTML
 	if p.ContentType == string(MARKDOWN) {
-		rendered = template.HTML(b.RenderTrustedMarkdown(p.Body))
+		rendered = template.HTML(markdown.RenderTrustedMarkdown(p.Body))
 	} else {
 		rendered = template.HTML(p.Body)
 	}
@@ -490,7 +491,7 @@ func (b *Blog) EditBlog(w http.ResponseWriter, r *http.Request) {
 		switch r.FormValue("submit") {
 		case "preview":
 			if post.ContentType == string(MARKDOWN) {
-				v.Data["preview"] = template.HTML(b.RenderTrustedMarkdown(post.Body))
+				v.Data["preview"] = template.HTML(markdown.RenderTrustedMarkdown(post.Body))
 			} else {
 				v.Data["preview"] = template.HTML(post.Body)
 			}
diff --git a/core/comments.go b/core/comments.go
index bfbae2e..521521d 100644
--- a/core/comments.go
+++ b/core/comments.go
@@ -11,6 +11,7 @@ import (
 	"github.com/google/uuid"
 	"github.com/gorilla/mux"
 	"github.com/gorilla/sessions"
+	"github.com/kirsle/blog/core/internal/markdown"
 	"github.com/kirsle/blog/core/internal/models/comments"
 	"github.com/kirsle/blog/core/internal/models/users"
 )
@@ -62,7 +63,7 @@ func (b *Blog) RenderComments(session *sessions.Session, csrfToken, url, subject
 	// Render all the comments in the thread.
 	userMap := map[int]*users.User{}
 	for _, c := range thread.Comments {
-		c.HTML = template.HTML(b.RenderMarkdown(c.Body))
+		c.HTML = template.HTML(markdown.RenderMarkdown(c.Body))
 		c.ThreadID = thread.ID
 		c.OriginURL = url
 		c.CSRF = csrfToken
@@ -203,7 +204,7 @@ func (b *Blog) CommentHandler(w http.ResponseWriter, r *http.Request) {
 			c.Email = currentUser.Email
 			c.LoadAvatar()
 		}
-		c.HTML = template.HTML(b.RenderMarkdown(c.Body))
+		c.HTML = template.HTML(markdown.RenderMarkdown(c.Body))
 	case "post":
 		if err := c.Validate(); err != nil {
 			v.Error = err
diff --git a/core/contact.go b/core/contact.go
index f1716f3..f4cb61e 100644
--- a/core/contact.go
+++ b/core/contact.go
@@ -10,6 +10,7 @@ import (
 
 	"github.com/gorilla/mux"
 	"github.com/kirsle/blog/core/internal/forms"
+	"github.com/kirsle/blog/core/internal/markdown"
 	"github.com/kirsle/blog/core/internal/models/settings"
 )
 
@@ -47,7 +48,7 @@ func (b *Blog) ContactRoutes(r *mux.Router) {
 					Template: ".email/contact.gohtml",
 					Data: map[string]interface{}{
 						"Name":    form.Name,
-						"Message": template.HTML(b.RenderMarkdown(form.Message)),
+						"Message": template.HTML(markdown.RenderMarkdown(form.Message)),
 						"Email":   form.Email,
 					},
 				})
diff --git a/core/app.go b/core/core.go
similarity index 95%
rename from core/app.go
rename to core/core.go
index 68182e2..5a48ecb 100644
--- a/core/app.go
+++ b/core/core.go
@@ -1,3 +1,4 @@
+// Package core implements the core source code of kirsle/blog.
 package core
 
 import (
@@ -7,14 +8,15 @@ import (
 
 	"github.com/gorilla/mux"
 	"github.com/gorilla/sessions"
-	"github.com/kirsle/blog/jsondb/caches"
-	"github.com/kirsle/blog/jsondb/caches/null"
-	"github.com/kirsle/blog/jsondb/caches/redis"
-	"github.com/kirsle/blog/jsondb"
+	"github.com/kirsle/blog/core/internal/markdown"
 	"github.com/kirsle/blog/core/internal/models/comments"
 	"github.com/kirsle/blog/core/internal/models/posts"
 	"github.com/kirsle/blog/core/internal/models/settings"
 	"github.com/kirsle/blog/core/internal/models/users"
+	"github.com/kirsle/blog/jsondb"
+	"github.com/kirsle/blog/jsondb/caches"
+	"github.com/kirsle/blog/jsondb/caches/null"
+	"github.com/kirsle/blog/jsondb/caches/redis"
 	"github.com/shurcooL/github_flavored_markdown/gfmstyle"
 	"github.com/urfave/negroni"
 )
@@ -76,6 +78,7 @@ func New(documentRoot, userRoot string) *Blog {
 		} else {
 			blog.Cache = cache
 			blog.DB.Cache = cache
+			markdown.Cache = cache
 		}
 	}
 
diff --git a/core/markdown.go b/core/internal/markdown/markdown.go
similarity index 78%
rename from core/markdown.go
rename to core/internal/markdown/markdown.go
index 28953ba..f48b748 100644
--- a/core/markdown.go
+++ b/core/internal/markdown/markdown.go
@@ -1,4 +1,5 @@
-package core
+// Package markdown implements a GitHub Flavored Markdown renderer.
+package markdown
 
 import (
 	"bytes"
@@ -10,17 +11,23 @@ import (
 	"regexp"
 	"strings"
 
+	"github.com/kirsle/blog/jsondb/caches"
+	"github.com/kirsle/golog"
 	"github.com/microcosm-cc/bluemonday"
 	"github.com/shurcooL/github_flavored_markdown"
 )
 
 // Regexps for Markdown use cases.
 var (
+	// Plug your own Redis cacher in.
+	Cache caches.Cacher
+
 	// Match title from the first `# h1` heading.
 	reMarkdownTitle = regexp.MustCompile(`(?m:^#([^#\r\n]+)$)`)
 
 	// Match fenced code blocks with languages defined.
-	reFencedCode = regexp.MustCompile("```" + `([a-z]*)[\r\n]([\s\S]*?)[\r\n]\s*` + "```")
+	reFencedCode      = regexp.MustCompile("```" + `([a-z]*)[\r\n]([\s\S]*?)[\r\n]\s*` + "```")
+	reFencedCodeClass = regexp.MustCompile("^highlight highlight-[a-zA-Z0-9]+$")
 
 	// Regexp to match fenced code blocks in rendered Markdown HTML.
 	// Tweak this if you change Markdown engines later.
@@ -28,6 +35,12 @@ var (
 	reDecodeBlock = regexp.MustCompile(`\[?FENCED_CODE_%d_BLOCK?\]`)
 )
 
+var log *golog.Logger
+
+func init() {
+	log = golog.GetLogger("blog")
+}
+
 // A container for parsed code blocks.
 type codeBlock struct {
 	placeholder int
@@ -51,8 +64,8 @@ func TitleFromMarkdown(body string) (string, error) {
 
 // RenderMarkdown renders markdown to HTML, safely. It uses blackfriday to
 // render Markdown to HTML and then Bluemonday to sanitize the resulting HTML.
-func (b *Blog) RenderMarkdown(input string) string {
-	unsafe := []byte(b.RenderTrustedMarkdown(input))
+func RenderMarkdown(input string) string {
+	unsafe := []byte(RenderTrustedMarkdown(input))
 
 	// Sanitize HTML, but allow fenced code blocks to not get mangled in user
 	// submitted comments.
@@ -65,7 +78,7 @@ func (b *Blog) RenderMarkdown(input string) string {
 // RenderTrustedMarkdown renders markdown to HTML, but without applying
 // bluemonday filtering afterward. This is for blog posts and website
 // Markdown pages, not for user-submitted comments or things.
-func (b *Blog) RenderTrustedMarkdown(input string) string {
+func RenderTrustedMarkdown(input string) string {
 	// Find and hang on to fenced code blocks.
 	codeBlocks := []codeBlock{}
 	matches := reFencedCode.FindAllStringSubmatch(input, -1)
@@ -87,7 +100,7 @@ func (b *Blog) RenderTrustedMarkdown(input string) string {
 
 	// Substitute fenced codes back in.
 	for _, block := range codeBlocks {
-		highlighted, _ := b.Pygmentize(block.language, block.source)
+		highlighted, _ := Pygmentize(block.language, block.source)
 		html = strings.Replace(html,
 			fmt.Sprintf("[?FENCED_CODE_%d_BLOCK?]", block.placeholder),
 			highlighted,
@@ -105,7 +118,7 @@ func (b *Blog) RenderTrustedMarkdown(input string) string {
 //
 // The rendered result is cached in Redis if available, because the CLI
 // call takes ~0.6s which is slow if you're rendering a lot of code blocks.
-func (b *Blog) Pygmentize(language, source string) (string, error) {
+func Pygmentize(language, source string) (string, error) {
 	var result string
 
 	// Hash the source for the cache key.
@@ -114,10 +127,11 @@ func (b *Blog) Pygmentize(language, source string) (string, error) {
 	hash := fmt.Sprintf("%x", h.Sum(nil))
 	cacheKey := "pygmentize:" + hash
 
+	_ = cacheKey
 	// Do we have it cached?
-	if cached, err := b.Cache.Get(cacheKey); err == nil && len(cached) > 0 {
-		return string(cached), nil
-	}
+	// if cached, err := b.Cache.Get(cacheKey); err == nil && len(cached) > 0 {
+	// 	return string(cached), nil
+	// }
 
 	// Defer to the `pygmentize` command
 	bin := "pygmentize"
@@ -140,10 +154,10 @@ func (b *Blog) Pygmentize(language, source string) (string, error) {
 	}
 
 	result = out.String()
-	err := b.Cache.Set(cacheKey, []byte(result), 60*60*24) // cool md5's don't change
-	if err != nil {
-		log.Error("Couldn't cache Pygmentize output: %s", err)
-	}
+	// err := b.Cache.Set(cacheKey, []byte(result), 60*60*24) // cool md5's don't change
+	// if err != nil {
+	// 	log.Error("Couldn't cache Pygmentize output: %s", err)
+	// }
 
 	return result, nil
 }
diff --git a/core/mail.go b/core/mail.go
index 4ff5c2b..6c0f750 100644
--- a/core/mail.go
+++ b/core/mail.go
@@ -8,6 +8,7 @@ import (
 	"net/url"
 	"strings"
 
+	"github.com/kirsle/blog/core/internal/markdown"
 	"github.com/kirsle/blog/core/internal/models/comments"
 	"github.com/kirsle/blog/core/internal/models/settings"
 	"github.com/microcosm-cc/bluemonday"
@@ -107,7 +108,7 @@ func (b *Blog) NotifyComment(c *comments.Comment) {
 		Data: map[string]interface{}{
 			"Name":    c.Name,
 			"Subject": c.Subject,
-			"Body":    template.HTML(b.RenderMarkdown(c.Body)),
+			"Body":    template.HTML(markdown.RenderMarkdown(c.Body)),
 			"URL":     strings.Trim(s.Site.URL, "/") + c.OriginURL,
 			"QuickDelete": fmt.Sprintf("%s/comments/quick-delete?t=%s&d=%s",
 				strings.Trim(s.Site.URL, "/"),
diff --git a/core/pages.go b/core/pages.go
index 6712a57..6024ca0 100644
--- a/core/pages.go
+++ b/core/pages.go
@@ -8,6 +8,8 @@ import (
 	"os"
 	"path/filepath"
 	"strings"
+
+	"github.com/kirsle/blog/core/internal/markdown"
 )
 
 // PageHandler is the catch-all route handler, for serving static web pages.
@@ -54,8 +56,8 @@ func (b *Blog) PageHandler(w http.ResponseWriter, r *http.Request) {
 
 		// Render it to HTML and find out its title.
 		body := string(source)
-		html := b.RenderTrustedMarkdown(body)
-		title, _ := TitleFromMarkdown(body)
+		html := markdown.RenderTrustedMarkdown(body)
+		title, _ := markdown.TitleFromMarkdown(body)
 
 		b.RenderTemplate(w, r, ".markdown", NewVars(map[interface{}]interface{}{
 			"Title":        title,
diff --git a/core/regexp.go b/core/regexp.go
deleted file mode 100644
index 3a3ffbe..0000000
--- a/core/regexp.go
+++ /dev/null
@@ -1,8 +0,0 @@
-package core
-
-import "regexp"
-
-var (
-	// CSS classes for Markdown fenced code blocks
-	reFencedCodeClass = regexp.MustCompile("^highlight highlight-[a-zA-Z0-9]+$")
-)