diff --git a/cfg/config.go b/cfg/config.go
index e85dd13..f5e6251 100644
--- a/cfg/config.go
+++ b/cfg/config.go
@@ -8,10 +8,18 @@ import (
 	"path/filepath"
 )
 
+const (
+	HyphaPattern    = `[^\s\d:/?&\\][^:?&\\]*`
+	HyphaUrl        = `/{hypha:` + HyphaPattern + `}`
+	RevisionPattern = `[\d]+`
+	RevQuery        = `{rev:` + RevisionPattern + `}`
+)
+
 var (
-	WikiDir        string
-	TemplatesDir   string
-	configJsonPath string
+	DescribeHyphaHerePattern = "Describe %s here"
+	WikiDir                  string
+	TemplatesDir             string
+	configJsonPath           string
 
 	// Default values that can be overriden in config.json
 	Address           = "127.0.0.1:80"
diff --git a/fs/data.go b/fs/data.go
new file mode 100644
index 0000000..0eb142d
--- /dev/null
+++ b/fs/data.go
@@ -0,0 +1,81 @@
+// This file contains methods for Hypha that calculate data about the hypha based on known information.
+package fs
+
+import (
+	"fmt"
+	"io/ioutil"
+	"log"
+	"path/filepath"
+	"strconv"
+	"strings"
+
+	"github.com/bouncepaw/mycorrhiza/cfg"
+)
+
+func (h *Hypha) MetaJsonPath() string {
+	return filepath.Join(h.Path(), "meta.json")
+}
+
+func (h *Hypha) Path() string {
+	return filepath.Join(cfg.WikiDir, h.FullName)
+}
+
+func (h *Hypha) TextPath() string {
+	return h.actual.TextPath
+}
+
+func (h *Hypha) parentName() string {
+	return filepath.Dir(h.FullName)
+}
+
+// hasBinaryData returns true if the revision has any binary data associated.
+// During initialisation, it is guaranteed that r.BinaryMime is set to "" if the revision has no binary data. (is it?)
+func (h *Hypha) hasBinaryData() bool {
+	return h.actual.BinaryMime != ""
+}
+
+func (h *Hypha) TagsJoined() string {
+	if h.Exists {
+		return strings.Join(h.actual.Tags, ", ")
+	}
+	return ""
+}
+
+func (h *Hypha) TextMime() string {
+	if h.Exists {
+		return h.actual.TextMime
+	}
+	return "text/markdown"
+}
+
+func (h *Hypha) mimeTypeForActionRaw() string {
+	// If text mime type is text/html, it is not good as it will be rendered.
+	if h.actual.TextMime == "text/html" {
+		return "text/plain"
+	}
+	return h.actual.TextMime
+}
+
+// NewestId finds the largest id among all revisions.
+func (h *Hypha) NewestId() string {
+	var largest int
+	for k, _ := range h.Revisions {
+		id, _ := strconv.Atoi(k)
+		if id > largest {
+			largest = id
+		}
+	}
+	return strconv.Itoa(largest)
+}
+
+func (h *Hypha) TextContent() string {
+	if h.Exists {
+		contents, err := ioutil.ReadFile(h.TextPath())
+		if err != nil {
+			log.Println("Could not read", h.FullName)
+			return "Error: could not hypha text content file. It is recommended to cancel editing. Please contact the wiki admin. If you are the admin, see the logs."
+		}
+		return string(contents)
+	}
+	return fmt.Sprintf(cfg.DescribeHyphaHerePattern, h.FullName)
+}
diff --git a/fs/fs.go b/fs/fs.go
new file mode 100644
index 0000000..b10dc74
--- /dev/null
+++ b/fs/fs.go
@@ -0,0 +1,59 @@
+package fs
+
+import (
+	"github.com/bouncepaw/mycorrhiza/cfg"
+	"io/ioutil"
+	"log"
+	"path/filepath"
+	"regexp"
+)
+
+type Storage struct {
+	// hypha name => path
+	paths map[string]string
+	root  string
+}
+
+var Hs *Storage
+
+// InitStorage initiates filesystem-based hypha storage. It has to be called after configuration was inited.
+func InitStorage() {
+	Hs = &Storage{
+		paths: make(map[string]string),
+		root:  cfg.WikiDir,
+	}
+	Hs.indexHyphae(Hs.root)
+	log.Printf("Indexed %v hyphae\n", len(Hs.paths))
+}
+
+// hyphaName gets name of a hypha by stripping path to the hypha in `fullPath`
+func hyphaName(fullPath string) string {
+	// {cfg.WikiDir}/{the name}
+	return fullPath[len(cfg.WikiDir)+1:]
+}
+
+// indexHyphae searches for all hyphae that seem valid in `path` and saves their absolute paths to `s.paths`. This function is recursive.
+func (s *Storage) indexHyphae(path string) {
+	nodes, err := ioutil.ReadDir(path)
+	if err != nil {
+		log.Fatal("Error when checking", path, ":", err, "; skipping")
+		return
+	}
+
+	for _, node := range nodes {
+		matchesHypha, err := regexp.MatchString(cfg.HyphaPattern, node.Name())
+		if err != nil {
+			log.Fatal("Error when matching", node.Name(), err, "\n")
+			return
+		}
+		switch name := filepath.Join(path, node.Name()); {
+		case matchesHypha && node.IsDir():
+			s.indexHyphae(name)
+		case node.Name() == "meta.json" && !node.IsDir():
+			s.paths[hyphaName(path)] = path
+		}
+	}
+}
+
+func (h *Hypha) Close() {
+}
diff --git a/genealogy.go b/fs/genealogy.go
similarity index 61%
rename from genealogy.go
rename to fs/genealogy.go
index 8b2a0af..3addd3d 100644
--- a/genealogy.go
+++ b/fs/genealogy.go
@@ -1,5 +1,4 @@
-/* Genealogy is all about relationships between hyphae.*/
-package main
+package fs
 
 import (
 	"fmt"
@@ -9,18 +8,7 @@ import (
 	"strings"
 )
 
-// setRelations fills in all children names based on what hyphae call their parents.
-func setRelations(hyphae map[string]*Hypha) {
-	for name, h := range hyphae {
-		if _, ok := hyphae[h.parentName]; ok && h.parentName != "." {
-			hyphae[h.parentName].ChildrenNames = append(hyphae[h.parentName].ChildrenNames, name)
-		}
-	}
-}
-
-// AddChild adds a name to the list of children names of the hypha.
-func (h *Hypha) AddChild(childName string) {
-	h.ChildrenNames = append(h.ChildrenNames, childName)
+func (s *Storage) RenderHypha(h *Hypha) {
 }
 
 // If Name == "", the tree is empty.
@@ -35,11 +23,10 @@ type Tree struct {
 // GetTree generates a Tree for the given hypha name.
 // It can also generate trees for non-existent hyphae, that's why we use `name string` instead of making it a method on `Hypha`.
 // In `root` is `false`, siblings will not be fetched.
-// Parameter `limit` is unused now but it is meant to limit how many subhyphae can be shown.
-func GetTree(name string, root bool, limit ...int) *Tree {
+func (s *Storage) GetTree(name string, root bool) *Tree {
 	t := &Tree{Name: name, Root: root}
-	for hyphaName, _ := range hyphae {
-		t.compareNamesAndAppend(hyphaName)
+	for hyphaName, _ := range s.paths {
+		s.compareNamesAndAppend(t, hyphaName)
 	}
 	sort.Slice(t.Ancestors, func(i, j int) bool {
 		return strings.Count(t.Ancestors[i], "/") < strings.Count(t.Ancestors[j], "/")
@@ -55,7 +42,7 @@ func GetTree(name string, root bool, limit ...int) *Tree {
 }
 
 // Compares names appends name2 to an array of `t`:
-func (t *Tree) compareNamesAndAppend(name2 string) {
+func (s *Storage) compareNamesAndAppend(t *Tree, name2 string) {
 	switch {
 	case t.Name == name2:
 	case strings.HasPrefix(t.Name, name2):
@@ -64,11 +51,11 @@ func (t *Tree) compareNamesAndAppend(name2 string) {
 		(filepath.Dir(t.Name) == filepath.Dir(name2))):
 		t.Siblings = append(t.Siblings, name2)
 	case strings.HasPrefix(name2, t.Name):
-		t.Descendants = append(t.Descendants, GetTree(name2, false))
+		t.Descendants = append(t.Descendants, s.GetTree(name2, false))
 	}
 }
 
-// AsHtml returns HTML representation of a tree.
+// asHtml returns HTML representation of a tree.
 // It recursively itself on the tree's children.
 // TODO: redo with templates. I'm not in mood for it now.
 func (t *Tree) AsHtml() (html string) {
@@ -78,16 +65,13 @@ func (t *Tree) AsHtml() (html string) {
 	html += `<ul class="navitree__node">`
 	if t.Root {
 		for _, ancestor := range t.Ancestors {
-			html += navitreeEntry(ancestor)
+			html += navitreeEntry(ancestor, "navitree__ancestor")
 		}
-	}
-	html += navitreeEntry(t.Name)
-
-	if t.Root {
 		for _, siblingName := range t.Siblings {
-			html += navitreeEntry(siblingName)
+			html += navitreeEntry(siblingName, "navitree__sibling")
 		}
 	}
+	html += navitreeEntry(t.Name, "navitree__name")
 
 	for _, subtree := range t.Descendants {
 		html += subtree.AsHtml()
@@ -99,9 +83,9 @@ func (t *Tree) AsHtml() (html string) {
 
 // navitreeEntry is a small utility function that makes generating html easier.
 // Someone please redo it in templates.
-func navitreeEntry(name string) string {
+func navitreeEntry(name, class string) string {
 	return fmt.Sprintf(`<li class="navitree__entry">
-	<a class="navitree__link" href="/%s">%s</a>
+	<a class="navitree__link %s" href="/%s">%s</a>
 </li>
-`, name, filepath.Base(name))
+`, class, name, filepath.Base(name))
 }
diff --git a/fs/html.go b/fs/html.go
new file mode 100644
index 0000000..f64059d
--- /dev/null
+++ b/fs/html.go
@@ -0,0 +1,54 @@
+package fs
+
+import (
+	"fmt"
+	"io/ioutil"
+	"log"
+
+	"github.com/gomarkdown/markdown"
+	"github.com/gomarkdown/markdown/html"
+	"github.com/gomarkdown/markdown/parser"
+)
+
+func markdownToHtml(md string) string {
+	extensions := parser.CommonExtensions | parser.AutoHeadingIDs
+	p := parser.NewWithExtensions(extensions)
+
+	htmlFlags := html.CommonFlags | html.HrefTargetBlank
+	opts := html.RendererOptions{Flags: htmlFlags}
+	renderer := html.NewRenderer(opts)
+
+	return string(markdown.ToHTML([]byte(md), p, renderer))
+}
+
+func (h *Hypha) asHtml() (string, error) {
+	rev := h.actual
+	ret := `<article class="page">
+	<h1 class="page__title">` + rev.FullName + `</h1>
+`
+	// What about using <figure>?
+	if h.hasBinaryData() {
+		ret += fmt.Sprintf(`<img src="/%s?action=binary&rev=%d" class="page__amnt"/>`, rev.FullName, rev.Id)
+	}
+
+	contents, err := ioutil.ReadFile(rev.TextPath)
+	if err != nil {
+		log.Println("Failed to render", rev.FullName, ":", err)
+		return "", err
+	}
+
+	// TODO: support more markups.
+	// TODO: support mycorrhiza extensions like transclusion.
+	switch rev.TextMime {
+	case "text/markdown":
+		html := markdown.ToHTML(contents, nil, nil)
+		ret += string(html)
+	default:
+		ret += fmt.Sprintf(`<pre>%s</pre>`, contents)
+	}
+
+	ret += `
+</article>`
+
+	return ret, nil
+}
diff --git a/fs/hypha.go b/fs/hypha.go
new file mode 100644
index 0000000..3ac7ed0
--- /dev/null
+++ b/fs/hypha.go
@@ -0,0 +1,319 @@
+package fs
+
+import (
+	"encoding/json"
+	"errors"
+	"io/ioutil"
+	"log"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/bouncepaw/mycorrhiza/cfg"
+)
+
+type Hypha struct {
+	Exists    bool                 `json:"-"`
+	FullName  string               `json:"-"`
+	ViewCount int                  `json:"views"`
+	Deleted   bool                 `json:"deleted"`
+	Revisions map[string]*Revision `json:"revisions"`
+	actual    *Revision            `json:"-"`
+	Invalid   bool
+	Err       error
+}
+
+func (h *Hypha) Invalidate(err error) *Hypha {
+	h.Invalid = true
+	h.Err = err
+	return h
+}
+
+func (s *Storage) Open(name string) *Hypha {
+	h := &Hypha{
+		Exists:   true,
+		FullName: name,
+	}
+	path, ok := s.paths[name]
+	// This hypha does not exist yet
+	if !ok {
+		log.Println("Hypha", name, "does not exist")
+		h.Exists = false
+		h.Revisions = make(map[string]*Revision)
+	} else {
+		metaJsonText, err := ioutil.ReadFile(filepath.Join(path, "meta.json"))
+		if err != nil {
+			return h.Invalidate(err)
+		}
+
+		err = json.Unmarshal(metaJsonText, &h)
+		if err != nil {
+			return h.Invalidate(err)
+		}
+		// fill in rooted paths to content files and full names
+		for idStr, rev := range h.Revisions {
+			rev.FullName = filepath.Join(h.parentName(), rev.ShortName)
+			rev.Id, _ = strconv.Atoi(idStr)
+			if rev.BinaryName != "" {
+				rev.BinaryPath = filepath.Join(path, rev.BinaryName)
+			}
+			rev.TextPath = filepath.Join(path, rev.TextName)
+		}
+
+		return h.OnRevision("0")
+	}
+	return h
+}
+
+// OnRevision tries to change to a revision specified by `id`.
+func (h *Hypha) OnRevision(id string) *Hypha {
+	if h.Invalid || !h.Exists {
+		return h
+	}
+	if len(h.Revisions) == 0 {
+		return h.Invalidate(errors.New("This hypha has no revisions"))
+	}
+	if id == "0" {
+		id = h.NewestId()
+	}
+	// Revision must be there, so no error checking
+	if rev, _ := h.Revisions[id]; true {
+		h.actual = rev
+	}
+	return h
+}
+
+func (h *Hypha) PlainLog(s string) {
+	if h.Exists {
+		log.Println(h.FullName, h.actual.Id, s)
+	} else {
+		log.Println("nonexistent", h.FullName, s)
+	}
+}
+
+func (h *Hypha) LogSuccMaybe(succMsg string) *Hypha {
+	if h.Invalid {
+		h.PlainLog(h.Err.Error())
+	} else {
+		h.PlainLog(succMsg)
+	}
+	return h
+}
+
+// ActionRaw is used with `?action=raw`.
+// It writes text content of the revision without any parsing or rendering.
+func (h *Hypha) ActionRaw(w http.ResponseWriter) *Hypha {
+	if h.Invalid {
+		return h
+	}
+	fileContents, err := ioutil.ReadFile(h.actual.TextPath)
+	if err != nil {
+		return h.Invalidate(err)
+	}
+	w.Header().Set("Content-Type", h.mimeTypeForActionRaw())
+	w.WriteHeader(http.StatusOK)
+	w.Write(fileContents)
+	return h
+}
+
+// ActionBinary is used with `?action=binary`.
+// It writes contents of binary content file.
+func (h *Hypha) ActionBinary(w http.ResponseWriter) *Hypha {
+	if h.Invalid {
+		return h
+	}
+	fileContents, err := ioutil.ReadFile(h.actual.BinaryPath)
+	if err != nil {
+		return h.Invalidate(err)
+	}
+	w.Header().Set("Content-Type", h.actual.BinaryMime)
+	w.WriteHeader(http.StatusOK)
+	w.Write(fileContents)
+	return h
+}
+
+// ActionZen is used with `?action=zen`.
+// It renders the hypha but without any layout or styles. Pure. Zen.
+func (h *Hypha) ActionZen(w http.ResponseWriter) *Hypha {
+	if h.Invalid {
+		return h
+	}
+	html, err := h.asHtml()
+	if err != nil {
+		w.WriteHeader(http.StatusInternalServerError)
+		return h.Invalidate(err)
+	}
+	w.Header().Set("Content-Type", "text/html;charset=utf-8")
+	w.WriteHeader(http.StatusOK)
+	w.Write([]byte(html))
+	return h
+}
+
+// ActionView is used with `?action=view` or no action at all.
+// It renders the page, the layout and everything else.
+func (h *Hypha) ActionView(w http.ResponseWriter, renderExists, renderNotExists func(string, string) string) *Hypha {
+	var html string
+	var err error
+	if h.Exists {
+		html, err = h.asHtml()
+		if err != nil {
+			w.WriteHeader(http.StatusInternalServerError)
+			return h.Invalidate(err)
+		}
+	}
+	w.Header().Set("Content-Type", "text/html;charset=utf-8")
+	w.WriteHeader(http.StatusOK)
+	if h.Exists {
+		w.Write([]byte(renderExists(h.FullName, html)))
+	} else {
+		w.Write([]byte(renderNotExists(h.FullName, "")))
+	}
+	return h
+}
+
+// CreateDirIfNeeded creates directory where the hypha must reside if needed.
+// It is not needed if the dir already exists.
+func (h *Hypha) CreateDirIfNeeded() *Hypha {
+	if h.Invalid {
+		return h
+	}
+	// os.MkdirAll created dir if it is not there. Basically, checks it for us.
+	err := os.MkdirAll(filepath.Join(cfg.WikiDir, h.FullName), os.ModePerm)
+	if err != nil {
+		h.Invalidate(err)
+	}
+	return h
+}
+
+// makeTagsSlice turns strings like `"foo,, bar,kek"` to slice of strings that represent tag names. Whitespace around commas is insignificant.
+// Expected output for string above: []string{"foo", "bar", "kek"}
+func makeTagsSlice(responseTagsString string) (ret []string) {
+	for _, tag := range strings.Split(responseTagsString, ",") {
+		if trimmed := strings.TrimSpace(tag); "" == trimmed {
+			ret = append(ret, trimmed)
+		}
+	}
+	return ret
+}
+
+// revisionFromHttpData creates a new revison for hypha `h`. All data is fetched from `rq`, except for BinaryMime and BinaryPath which require additional processing. The revision is inserted for you. You'll have to pop it out if there is an error.
+func (h *Hypha) AddRevisionFromHttpData(rq *http.Request) *Hypha {
+	if h.Invalid {
+		return h
+	}
+	id := 1
+	if h.Exists {
+		id = h.actual.Id + 1
+	}
+	log.Printf("Creating revision %d from http data", id)
+	rev := &Revision{
+		Id:        id,
+		FullName:  h.FullName,
+		ShortName: filepath.Base(h.FullName),
+		Tags:      makeTagsSlice(rq.PostFormValue("tags")),
+		Comment:   rq.PostFormValue("comment"),
+		Author:    rq.PostFormValue("author"),
+		Time:      int(time.Now().Unix()),
+		TextMime:  rq.PostFormValue("text_mime"),
+		// Fields left: BinaryMime, BinaryPath, BinaryName, TextName, TextPath
+	}
+	rev.generateTextFilename() // TextName is set now
+	rev.TextPath = filepath.Join(h.Path(), rev.TextName)
+	return h.AddRevision(rev)
+}
+
+func (h *Hypha) AddRevision(rev *Revision) *Hypha {
+	if h.Invalid {
+		return h
+	}
+	h.Revisions[strconv.Itoa(rev.Id)] = rev
+	h.actual = rev
+	return h
+}
+
+// WriteTextFileFromHttpData tries to fetch text content from `rq` for revision `rev` and write it to a corresponding text file. It used in `HandlerUpdate`.
+func (h *Hypha) WriteTextFileFromHttpData(rq *http.Request) *Hypha {
+	if h.Invalid {
+		return h
+	}
+	data := []byte(rq.PostFormValue("text"))
+	err := ioutil.WriteFile(h.TextPath(), data, 0644)
+	if err != nil {
+		log.Println("Failed to write", len(data), "bytes to", h.TextPath())
+		h.Invalidate(err)
+	}
+	return h
+}
+
+// WriteBinaryFileFromHttpData tries to fetch binary content from `rq` for revision `newRev` and write it to a corresponding binary file. If there is no content, it is taken from a previous revision, if there is any.
+func (h *Hypha) WriteBinaryFileFromHttpData(rq *http.Request) *Hypha {
+	if h.Invalid {
+		return h
+	}
+	// 10 MB file size limit
+	rq.ParseMultipartForm(10 << 20)
+	// Read file
+	file, handler, err := rq.FormFile("binary")
+	if file != nil {
+		defer file.Close()
+	}
+	// If file is not passed:
+	if err != nil {
+		// Let's hope there are no other errors 🙏
+		// TODO: actually check if there any other errors
+		log.Println("No binary data passed for", h.FullName)
+		// It is expected there is at least one revision
+		if len(h.Revisions) > 1 {
+			prevRev := h.Revisions[strconv.Itoa(h.actual.Id-1)]
+			h.actual.BinaryMime = prevRev.BinaryMime
+			h.actual.BinaryPath = prevRev.BinaryPath
+			h.actual.BinaryName = prevRev.BinaryName
+			log.Println("Set previous revision's binary data")
+		}
+		return h
+	}
+	// If file is passed:
+	h.actual.BinaryMime = handler.Header.Get("Content-Type")
+	h.actual.generateBinaryFilename()
+	h.actual.BinaryPath = filepath.Join(h.Path(), h.actual.BinaryName)
+
+	data, err := ioutil.ReadAll(file)
+	if err != nil {
+		return h.Invalidate(err)
+	}
+	log.Println("Got", len(data), "of binary data for", h.FullName)
+	err = ioutil.WriteFile(h.actual.BinaryPath, data, 0644)
+	if err != nil {
+		return h.Invalidate(err)
+	}
+	log.Println("Written", len(data), "of binary data for", h.FullName)
+	return h
+}
+
+// SaveJson dumps the hypha's metadata to `meta.json` file.
+func (h *Hypha) SaveJson() *Hypha {
+	if h.Invalid {
+		return h
+	}
+	data, err := json.MarshalIndent(h, "", "\t")
+	if err != nil {
+		return h.Invalidate(err)
+	}
+	err = ioutil.WriteFile(h.MetaJsonPath(), data, 0644)
+	if err != nil {
+		return h.Invalidate(err)
+	}
+	log.Println("Saved JSON data of", h.FullName)
+	return h
+}
+
+// Store adds `h` to the `Hs` if it is not already there
+func (h *Hypha) Store() *Hypha {
+	if !h.Invalid {
+		Hs.paths[h.FullName] = h.Path()
+	}
+	return h
+}
diff --git a/fs/revision.go b/fs/revision.go
new file mode 100644
index 0000000..69ae0c6
--- /dev/null
+++ b/fs/revision.go
@@ -0,0 +1,42 @@
+package fs
+
+import (
+	"mime"
+	"strconv"
+)
+
+type Revision struct {
+	Id         int      `json:"-"`
+	FullName   string   `json:"-"`
+	Tags       []string `json:"tags"`
+	ShortName  string   `json:"name"`
+	Comment    string   `json:"comment"`
+	Author     string   `json:"author"`
+	Time       int      `json:"time"`
+	TextMime   string   `json:"text_mime"`
+	BinaryMime string   `json:"binary_mime"`
+	TextPath   string   `json:"-"`
+	BinaryPath string   `json:"-"`
+	TextName   string   `json:"text_name"`
+	BinaryName string   `json:"binary_name"`
+}
+
+// TODO: https://github.com/bouncepaw/mycorrhiza/issues/4
+// Some filenames are wrong?
+func (rev *Revision) generateTextFilename() {
+	ts, err := mime.ExtensionsByType(rev.TextMime)
+	if err != nil || ts == nil {
+		rev.TextName = strconv.Itoa(rev.Id) + ".txt"
+	} else {
+		rev.TextName = strconv.Itoa(rev.Id) + ts[0]
+	}
+}
+
+func (rev *Revision) generateBinaryFilename() {
+	ts, err := mime.ExtensionsByType(rev.BinaryMime)
+	if err != nil || ts == nil {
+		rev.BinaryName = strconv.Itoa(rev.Id) + ".bin"
+	} else {
+		rev.BinaryName = strconv.Itoa(rev.Id) + ts[0]
+	}
+}
diff --git a/handlers.go b/handlers.go
index fab7b0f..0f52411 100644
--- a/handlers.go
+++ b/handlers.go
@@ -1,213 +1,68 @@
 package main
 
 import (
-	"io/ioutil"
 	"log"
 	"net/http"
-	"path/filepath"
-	"strconv"
-	"strings"
-	"time"
 
-	"github.com/bouncepaw/mycorrhiza/cfg"
+	"github.com/bouncepaw/mycorrhiza/fs"
+	"github.com/bouncepaw/mycorrhiza/render"
 	"github.com/gorilla/mux"
 )
 
 // There are handlers below. See main() for their usage.
 
 // Boilerplate code present in many handlers. Good to have it.
-func HandlerBase(w http.ResponseWriter, rq *http.Request) (Revision, bool) {
+func HandlerBase(w http.ResponseWriter, rq *http.Request) *fs.Hypha {
 	vars := mux.Vars(rq)
-	revno := RevInMap(vars)
-	return GetRevision(vars["hypha"], revno)
-}
-
-func HandlerGetBinary(w http.ResponseWriter, rq *http.Request) {
-	if rev, ok := HandlerBase(w, rq); ok {
-		rev.ActionGetBinary(w)
-	}
+	return fs.Hs.Open(vars["hypha"]).OnRevision(RevInMap(vars))
 }
 
 func HandlerRaw(w http.ResponseWriter, rq *http.Request) {
-	if rev, ok := HandlerBase(w, rq); ok {
-		rev.ActionRaw(w)
-	}
+	log.Println("?action=raw")
+	HandlerBase(w, rq).ActionRaw(w).LogSuccMaybe("Serving raw text")
+}
+
+func HandlerBinary(w http.ResponseWriter, rq *http.Request) {
+	log.Println("?action=binary")
+	HandlerBase(w, rq).ActionBinary(w).LogSuccMaybe("Serving binary data")
 }
 
 func HandlerZen(w http.ResponseWriter, rq *http.Request) {
-	if rev, ok := HandlerBase(w, rq); ok {
-		rev.ActionZen(w)
-	}
+	log.Println("?action=zen")
+	HandlerBase(w, rq).ActionZen(w).LogSuccMaybe("Rendering zen")
 }
 
 func HandlerView(w http.ResponseWriter, rq *http.Request) {
-	if rev, ok := HandlerBase(w, rq); ok {
-		rev.ActionView(w, HyphaPage)
-	} else { // Hypha does not exist
-		log.Println("Hypha does not exist, showing 404")
-		w.WriteHeader(http.StatusNotFound)
-		w.Write([]byte(Hypha404(mux.Vars(rq)["hypha"])))
-	}
-}
-
-func HandlerHistory(w http.ResponseWriter, rq *http.Request) {
-	w.WriteHeader(http.StatusNotImplemented)
-	log.Println("Attempt to access an unimplemented thing")
+	log.Println("?action=view")
+	HandlerBase(w, rq).
+		ActionView(w, render.HyphaPage, render.Hypha404).
+		LogSuccMaybe("Rendering hypha view")
 }
 
 func HandlerEdit(w http.ResponseWriter, rq *http.Request) {
 	vars := mux.Vars(rq)
-	ActionEdit(vars["hypha"], w)
-}
-
-func HandlerRewind(w http.ResponseWriter, rq *http.Request) {
-	w.WriteHeader(http.StatusNotImplemented)
-	log.Println("Attempt to access an unimplemented thing")
-}
-
-func HandlerDelete(w http.ResponseWriter, rq *http.Request) {
-	w.WriteHeader(http.StatusNotImplemented)
-	log.Println("Attempt to access an unimplemented thing")
-}
-
-func HandlerRename(w http.ResponseWriter, rq *http.Request) {
-	w.WriteHeader(http.StatusNotImplemented)
-	log.Println("Attempt to access an unimplemented thing")
-}
-
-// makeTagsSlice turns strings like `"foo,, bar,kek"` to slice of strings that represent tag names. Whitespace around commas is insignificant.
-// Expected output for string above: []string{"foo", "bar", "kek"}
-func makeTagsSlice(responseTagsString string) (ret []string) {
-	for _, tag := range strings.Split(responseTagsString, ",") {
-		if trimmed := strings.TrimSpace(tag); "" == trimmed {
-			ret = append(ret, trimmed)
-		}
-	}
-	return ret
-}
-
-// getHypha returns an existing hypha if it exists in `hyphae` or creates a new one. If it `isNew`, you'll have to insert it to `hyphae` yourself.
-func getHypha(name string) (*Hypha, bool) {
-	log.Println("Accessing hypha", name)
-	if h, ok := hyphae[name]; ok {
-		log.Println("Got hypha", name)
-		return h, false
-	}
-	log.Println("Create hypha", name)
-	h := &Hypha{
-		FullName:   name,
-		Path:       filepath.Join(cfg.WikiDir, name),
-		Revisions:  make(map[string]*Revision),
-		parentName: filepath.Dir(name),
-	}
-	return h, true
-}
-
-// revisionFromHttpData creates a new revison for hypha `h`. All data is fetched from `rq`, except for BinaryMime and BinaryPath which require additional processing. You'll have te insert the revision to `h` yourself.
-func revisionFromHttpData(h *Hypha, rq *http.Request) *Revision {
-	idStr := strconv.Itoa(h.NewestRevisionInt() + 1)
-	log.Printf("Creating revision %s from http data", idStr)
-	rev := &Revision{
-		Id:        h.NewestRevisionInt() + 1,
-		FullName:  h.FullName,
-		ShortName: filepath.Base(h.FullName),
-		Tags:      makeTagsSlice(rq.PostFormValue("tags")),
-		Comment:   rq.PostFormValue("comment"),
-		Author:    rq.PostFormValue("author"),
-		Time:      int(time.Now().Unix()),
-		TextMime:  rq.PostFormValue("text_mime"),
-		// Fields left: BinaryMime, BinaryPath, BinaryName, TextName, TextPath
-	}
-	rev.desiredTextFilename() // TextName is set now
-	rev.TextPath = filepath.Join(h.Path, rev.TextName)
-	return rev
-}
-
-// writeTextFileFromHttpData tries to fetch text content from `rq` for revision `rev` and write it to a corresponding text file. It used in `HandlerUpdate`.
-func writeTextFileFromHttpData(rev *Revision, rq *http.Request) error {
-	data := []byte(rq.PostFormValue("text"))
-	err := ioutil.WriteFile(rev.TextPath, data, 0644)
-	if err != nil {
-		log.Println("Failed to write", len(data), "bytes to", rev.TextPath)
-	}
-	return err
-}
-
-// writeBinaryFileFromHttpData tries to fetch binary content from `rq` for revision `newRev` and write it to a corresponding binary file. If there is no content, it is taken from `oldRev`.
-func writeBinaryFileFromHttpData(h *Hypha, oldRev Revision, newRev *Revision, rq *http.Request) error {
-	// 10 MB file size limit
-	rq.ParseMultipartForm(10 << 20)
-	// Read file
-	file, handler, err := rq.FormFile("binary")
-	if file != nil {
-		defer file.Close()
-	}
-	if err != nil {
-		log.Println("No binary data passed for", newRev.FullName)
-		newRev.BinaryMime = oldRev.BinaryMime
-		newRev.BinaryPath = oldRev.BinaryPath
-		newRev.BinaryName = oldRev.BinaryName
-		log.Println("Set previous revision's binary data")
-		return nil
-	}
-	newRev.BinaryMime = handler.Header.Get("Content-Type")
-	newRev.BinaryPath = filepath.Join(h.Path, newRev.IdAsStr()+".bin")
-	newRev.BinaryName = newRev.desiredBinaryFilename()
-	data, err := ioutil.ReadAll(file)
-	if err != nil {
-		log.Println(err)
-		return err
-	}
-	log.Println("Got", len(data), "of binary data for", newRev.FullName)
-	err = ioutil.WriteFile(newRev.BinaryPath, data, 0644)
-	if err != nil {
-		log.Println("Failed to write", len(data), "bytes to", newRev.TextPath)
-		return err
-	}
-	log.Println("Written", len(data), "of binary data for", newRev.FullName)
-	return nil
+	h := fs.Hs.Open(vars["hypha"]).OnRevision("0")
+	w.Header().Set("Content-Type", "text/html;charset=utf-8")
+	w.WriteHeader(http.StatusOK)
+	w.Write([]byte(render.HyphaEdit(h)))
 }
 
 func HandlerUpdate(w http.ResponseWriter, rq *http.Request) {
 	vars := mux.Vars(rq)
-	log.Println("Attempt to update hypha", mux.Vars(rq)["hypha"])
-	h, isNew := getHypha(vars["hypha"])
-	var oldRev Revision
-	if !isNew {
-		oldRev = h.GetNewestRevision()
-	} else {
-		h = &Hypha{
-			FullName:   vars["hypha"],
-			Path:       filepath.Join(cfg.WikiDir, vars["hypha"]),
-			Revisions:  make(map[string]*Revision),
-			parentName: filepath.Dir(vars["hypha"]),
-		}
-		h.CreateDir()
-		oldRev = Revision{}
-	}
-	newRev := revisionFromHttpData(h, rq)
+	log.Println("Attempt to update hypha", vars["hypha"])
+	h := fs.Hs.
+		Open(vars["hypha"]).
+		CreateDirIfNeeded().
+		AddRevisionFromHttpData(rq).
+		WriteTextFileFromHttpData(rq).
+		WriteBinaryFileFromHttpData(rq).
+		SaveJson().
+		Store().
+		LogSuccMaybe("Saved changes")
 
-	err := writeTextFileFromHttpData(newRev, rq)
-	if err != nil {
-		log.Println(err)
-		return
+	if !h.Invalid {
+		w.WriteHeader(http.StatusOK)
+		w.Header().Set("Content-Type", "text/html; charset=utf-8")
+		w.Write([]byte(render.HyphaUpdateOk(h)))
 	}
-	err = writeBinaryFileFromHttpData(h, oldRev, newRev, rq)
-	if err != nil {
-		log.Println(err)
-		return
-	}
-
-	h.Revisions[newRev.IdAsStr()] = newRev
-	h.SaveJson()
-	if isNew {
-		hyphae[h.FullName] = h
-	}
-
-	log.Println("Current hyphae storage is", hyphae)
-
-	w.WriteHeader(http.StatusOK)
-	w.Header().Set("Content-Type", "text/html; charset=utf-8")
-	d := map[string]string{"Name": h.FullName}
-	w.Write([]byte(renderFromMap(d, "updateOk.html")))
 }
diff --git a/hypha.go b/hypha.go
deleted file mode 100644
index 540d31b..0000000
--- a/hypha.go
+++ /dev/null
@@ -1,113 +0,0 @@
-package main
-
-import (
-	"encoding/json"
-	"fmt"
-	"io/ioutil"
-	"log"
-	"net/http"
-	"os"
-	"path/filepath"
-	"strconv"
-	"strings"
-
-	"github.com/bouncepaw/mycorrhiza/cfg"
-)
-
-// `Hypha` represents a hypha. It is the thing MycorrhizaWiki generally serves.
-// Each hypha has 1 or more revisions.
-type Hypha struct {
-	FullName      string               `json:"-"`
-	Path          string               `json:"-"`
-	ViewCount     int                  `json:"views"`
-	Deleted       bool                 `json:"deleted"`
-	Revisions     map[string]*Revision `json:"revisions"`
-	ChildrenNames []string             `json:"-"`
-	parentName    string
-}
-
-// AsHtml returns HTML representation of the hypha.
-// No layout or navigation are present here. Just the hypha.
-func (h *Hypha) AsHtml(id string, w http.ResponseWriter) (string, error) {
-	if "0" == id {
-		id = h.NewestRevision()
-	}
-	if rev, ok := h.Revisions[id]; ok {
-		return rev.AsHtml(w)
-	}
-	return "", fmt.Errorf("Hypha %v has no such revision: %v", h.FullName, id)
-}
-
-// GetNewestRevision returns the most recent Revision.
-func (h *Hypha) GetNewestRevision() Revision {
-	return *h.Revisions[h.NewestRevision()]
-}
-
-// NewestRevision returns the most recent revision's id as a string.
-func (h *Hypha) NewestRevision() string {
-	return strconv.Itoa(h.NewestRevisionInt())
-}
-
-// NewestRevision returns the most recent revision's id as an integer.
-func (h *Hypha) NewestRevisionInt() (ret int) {
-	for k, _ := range h.Revisions {
-		id, _ := strconv.Atoi(k)
-		if id > ret {
-			ret = id
-		}
-	}
-	return ret
-}
-
-// MetaJsonPath returns rooted path to the hypha's `meta.json` file.
-// It is not promised that the file exists.
-func (h *Hypha) MetaJsonPath() string {
-	return filepath.Join(h.Path, "meta.json")
-}
-
-// CreateDir creates directory where the hypha must reside.
-// It is meant to be used with new hyphae.
-func (h *Hypha) CreateDir() error {
-	return os.MkdirAll(h.Path, os.ModePerm)
-}
-
-// SaveJson dumps the hypha's metadata to `meta.json` file.
-func (h *Hypha) SaveJson() {
-	data, err := json.MarshalIndent(h, "", "\t")
-	if err != nil {
-		log.Println("Failed to create JSON of hypha.", err)
-		return
-	}
-	err = ioutil.WriteFile(h.MetaJsonPath(), data, 0644)
-	if err != nil {
-		log.Println("Failed to save JSON of hypha.", err)
-		return
-	}
-	log.Println("Saved JSON data of", h.FullName)
-}
-
-// ActionEdit is called with `?acton=edit`.
-// It represents the hypha editor.
-func ActionEdit(hyphaName string, w http.ResponseWriter) {
-	w.Header().Set("Content-Type", "text/html; charset=utf-8")
-	var initContents, initTextMime, initTags string
-	if h, ok := hyphae[hyphaName]; ok {
-		newestRev := h.GetNewestRevision()
-		contents, err := ioutil.ReadFile(newestRev.TextPath)
-		if err != nil {
-			log.Println("Could not read", newestRev.TextPath)
-			w.WriteHeader(http.StatusInternalServerError)
-			w.Write([]byte(cfg.GenericErrorMsg))
-			return
-		}
-		initContents = string(contents)
-		initTextMime = newestRev.TextMime
-		initTags = strings.Join(newestRev.Tags, ",")
-	} else {
-		initContents = "Describe " + hyphaName + "here."
-		initTextMime = "text/markdown"
-	}
-
-	w.WriteHeader(http.StatusOK)
-	w.Write([]byte(EditHyphaPage(hyphaName, initTextMime, initContents, initTags)))
-}
diff --git a/main.go b/main.go
index acbc044..215646c 100644
--- a/main.go
+++ b/main.go
@@ -9,25 +9,10 @@ import (
 	"time"
 
 	"github.com/bouncepaw/mycorrhiza/cfg"
+	"github.com/bouncepaw/mycorrhiza/fs"
 	"github.com/gorilla/mux"
 )
 
-// GetRevision finds revision with id `id` of `hyphaName` in `hyphae`.
-// If `id` is `"0"`, it means the last revision.
-// If no such revision is found, last return value is false.
-func GetRevision(hyphaName string, id string) (Revision, bool) {
-	log.Println("Getting hypha", hyphaName, id)
-	if hypha, ok := hyphae[hyphaName]; ok {
-		if id == "0" {
-			id = hypha.NewestRevision()
-		}
-		if rev, ok := hypha.Revisions[id]; ok {
-			return *rev, true
-		}
-	}
-	return Revision{}, false
-}
-
 // RevInMap finds value of `rev` (the one from URL queries like) in the passed map that is usually got from `mux.Vars(*http.Request)`.
 // If there is no `rev`, return "0".
 func RevInMap(m map[string]string) string {
@@ -37,9 +22,6 @@ func RevInMap(m map[string]string) string {
 	return "0"
 }
 
-// `hyphae` is a map with all hyphae. Many functions use it.
-var hyphae map[string]*Hypha
-
 func main() {
 	if len(os.Args) == 1 {
 		panic("Expected a root wiki pages directory")
@@ -52,51 +34,42 @@ func main() {
 	log.Println("Welcome to MycorrhizaWiki α")
 	cfg.InitConfig(wikiDir)
 	log.Println("Indexing hyphae...")
-	hyphae = recurFindHyphae(wikiDir)
-	log.Println("Indexed", len(hyphae), "hyphae. Ready to accept requests.")
+	fs.InitStorage()
 
 	// Start server code. See handlers.go for handlers' implementations.
 	r := mux.NewRouter()
 
-	r.Queries("action", "getBinary", "rev", revQuery).Path(hyphaUrl).
-		HandlerFunc(HandlerGetBinary)
-	r.Queries("action", "getBinary").Path(hyphaUrl).
-		HandlerFunc(HandlerGetBinary)
+	r.HandleFunc("/favicon.ico", func(w http.ResponseWriter, rq *http.Request) {
+		http.ServeFile(w, rq, filepath.Join(filepath.Dir(cfg.WikiDir), "favicon.ico"))
+	})
 
-	r.Queries("action", "raw", "rev", revQuery).Path(hyphaUrl).
+	r.Queries("action", "binary", "rev", cfg.RevQuery).Path(cfg.HyphaUrl).
+		HandlerFunc(HandlerBinary)
+	r.Queries("action", "binary").Path(cfg.HyphaUrl).
+		HandlerFunc(HandlerBinary)
+
+	r.Queries("action", "raw", "rev", cfg.RevQuery).Path(cfg.HyphaUrl).
 		HandlerFunc(HandlerRaw)
-	r.Queries("action", "raw").Path(hyphaUrl).
+	r.Queries("action", "raw").Path(cfg.HyphaUrl).
 		HandlerFunc(HandlerRaw)
 
-	r.Queries("action", "zen", "rev", revQuery).Path(hyphaUrl).
+	r.Queries("action", "zen", "rev", cfg.RevQuery).Path(cfg.HyphaUrl).
 		HandlerFunc(HandlerZen)
-	r.Queries("action", "zen").Path(hyphaUrl).
+	r.Queries("action", "zen").Path(cfg.HyphaUrl).
 		HandlerFunc(HandlerZen)
 
-	r.Queries("action", "view", "rev", revQuery).Path(hyphaUrl).
+	r.Queries("action", "view", "rev", cfg.RevQuery).Path(cfg.HyphaUrl).
 		HandlerFunc(HandlerView)
-	r.Queries("action", "view").Path(hyphaUrl).
+	r.Queries("action", "view").Path(cfg.HyphaUrl).
 		HandlerFunc(HandlerView)
 
-	r.Queries("action", "history").Path(hyphaUrl).
-		HandlerFunc(HandlerHistory)
-
-	r.Queries("action", "edit").Path(hyphaUrl).
+	r.Queries("action", "edit").Path(cfg.HyphaUrl).
 		HandlerFunc(HandlerEdit)
 
-	r.Queries("action", "rewind", "rev", revQuery).Path(hyphaUrl).
-		HandlerFunc(HandlerRewind)
-
-	r.Queries("action", "delete").Path(hyphaUrl).
-		HandlerFunc(HandlerDelete)
-
-	r.Queries("action", "rename", "to", hyphaPattern).Path(hyphaUrl).
-		HandlerFunc(HandlerRename)
-
-	r.Queries("action", "update").Path(hyphaUrl).Methods("POST").
+	r.Queries("action", "update").Path(cfg.HyphaUrl).Methods("POST").
 		HandlerFunc(HandlerUpdate)
 
-	r.HandleFunc(hyphaUrl, HandlerView)
+	r.HandleFunc(cfg.HyphaUrl, HandlerView)
 
 	// Debug page that renders all hyphae.
 	// TODO: make it redirect to home page.
@@ -104,14 +77,10 @@ func main() {
 	r.HandleFunc("/", func(w http.ResponseWriter, rq *http.Request) {
 		w.Header().Set("Content-Type", "text/html; charset=utf-8")
 		w.WriteHeader(http.StatusOK)
-		for _, h := range hyphae {
-			log.Println("Rendering latest revision of hypha", h.FullName)
-			html, err := h.AsHtml("0", w)
-			if err != nil {
-				fmt.Fprintln(w, err)
-			}
-			fmt.Fprintln(w, html)
-		}
+		fmt.Fprintln(w, `
+<p>Check out <a href="/Fruit">Fruit</a> maybe.</p>
+<p><strong>TODO:</strong> make this page usable</p>
+		`)
 	})
 
 	http.Handle("/", r)
diff --git a/render.go b/render/render.go
similarity index 70%
rename from render.go
rename to render/render.go
index 85bdd3a..7ff6a05 100644
--- a/render.go
+++ b/render/render.go
@@ -1,4 +1,4 @@
-package main
+package render
 
 import (
 	"bytes"
@@ -7,6 +7,7 @@ import (
 	"text/template"
 
 	"github.com/bouncepaw/mycorrhiza/cfg"
+	"github.com/bouncepaw/mycorrhiza/fs"
 )
 
 // EditHyphaPage returns HTML page of hypha editor.
@@ -25,21 +26,36 @@ func EditHyphaPage(name, textMime, content, tags string) string {
 	return renderBase(renderFromMap(page, "Hypha/edit/index.html"), keys)
 }
 
+func HyphaEdit(h *fs.Hypha) string {
+	page := map[string]string{
+		"Name":     h.FullName,
+		"Tags":     h.TagsJoined(),
+		"TextMime": h.TextMime(),
+		"Text":     h.TextContent(),
+	}
+	keys := map[string]string{
+		"Title":   fmt.Sprintf(cfg.TitleEditTemplate, h.FullName),
+		"Header":  renderFromString(h.FullName, "Hypha/edit/header.html"),
+		"Sidebar": renderFromMap(page, "Hypha/edit/sidebar.html"),
+	}
+	return renderBase(renderFromMap(page, "Hypha/edit/index.html"), keys)
+}
+
 // Hypha404 returns 404 page for nonexistent page.
-func Hypha404(name string) string {
+func Hypha404(name, _ string) string {
 	return HyphaGeneric(name, name, "Hypha/view/404.html")
 }
 
 // HyphaPage returns HTML page of hypha viewer.
-func HyphaPage(rev Revision, content string) string {
-	return HyphaGeneric(rev.FullName, content, "Hypha/view/index.html")
+func HyphaPage(name, content string) string {
+	return HyphaGeneric(name, content, "Hypha/view/index.html")
 }
 
 // HyphaGeneric is used when building renderers for all types of hypha pages
 func HyphaGeneric(name string, content, templatePath string) string {
 	var sidebar string
 	if aside := renderFromMap(map[string]string{
-		"Tree": GetTree(name, true).AsHtml(),
+		"Tree": fs.Hs.GetTree(name, true).AsHtml(),
 	}, "Hypha/view/sidebar.html"); aside != "" {
 		sidebar = aside
 	}
@@ -50,6 +66,13 @@ func HyphaGeneric(name string, content, templatePath string) string {
 	return renderBase(renderFromString(content, templatePath), keys)
 }
 
+func HyphaUpdateOk(h *fs.Hypha) string {
+	data := map[string]string{
+		"Name": h.FullName,
+	}
+	return renderFromMap(data, "updateOk.html")
+}
+
 // renderBase collects and renders page from base template
 // Args:
 //   content: string or pre-rendered template
@@ -70,8 +93,8 @@ func renderBase(content string, keys map[string]string) string {
 // renderFromMap applies `data` map to template in `templatePath` and returns the result.
 func renderFromMap(data map[string]string, templatePath string) string {
 	hyphPath := path.Join(cfg.TemplatesDir, cfg.Theme, templatePath)
-	rev, _ := GetRevision(hyphPath, "0")
-	tmpl, err := template.ParseFiles(rev.TextPath)
+	h := fs.Hs.Open(hyphPath).OnRevision("0")
+	tmpl, err := template.ParseFiles(h.TextPath())
 	if err != nil {
 		return err.Error()
 	}
@@ -85,8 +108,8 @@ func renderFromMap(data map[string]string, templatePath string) string {
 // renderFromMap applies `data` string to template in `templatePath` and returns the result.
 func renderFromString(data string, templatePath string) string {
 	hyphPath := path.Join(cfg.TemplatesDir, cfg.Theme, templatePath)
-	rev, _ := GetRevision(hyphPath, "0")
-	tmpl, err := template.ParseFiles(rev.TextPath)
+	h := fs.Hs.Open(hyphPath).OnRevision("0")
+	tmpl, err := template.ParseFiles(h.TextPath())
 	if err != nil {
 		return err.Error()
 	}
diff --git a/revision.go b/revision.go
deleted file mode 100644
index 35b653b..0000000
--- a/revision.go
+++ /dev/null
@@ -1,148 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"io/ioutil"
-	"log"
-	"mime"
-	"net/http"
-	"strconv"
-
-	"github.com/gomarkdown/markdown"
-)
-
-// Revision represents a revision, duh.
-// A revision is a version of a hypha at a point in time.
-type Revision struct {
-	Id         int      `json:"-"`
-	FullName   string   `json:"-"`
-	Tags       []string `json:"tags"`
-	ShortName  string   `json:"name"`
-	Comment    string   `json:"comment"`
-	Author     string   `json:"author"`
-	Time       int      `json:"time"`
-	TextMime   string   `json:"text_mime"`
-	BinaryMime string   `json:"binary_mime"`
-	TextPath   string   `json:"-"`
-	BinaryPath string   `json:"-"`
-	TextName   string   `json:"text_name"`
-	BinaryName string   `json:"binary_name"`
-}
-
-// IdAsStr returns revision's id as a string.
-func (rev *Revision) IdAsStr() string {
-	return strconv.Itoa(rev.Id)
-}
-
-// hasBinaryData returns true if the revision has any binary data associated.
-// During initialisation, it is guaranteed that r.BinaryMime is set to "" if the revision has no binary data.
-func (rev *Revision) hasBinaryData() bool {
-	return rev.BinaryMime != ""
-}
-
-// desiredBinaryFilename returns string that represents filename to use when saving  a binary content file of a new revison.
-// It also sets the corresponding field in `rev`.
-func (rev *Revision) desiredBinaryFilename() string {
-	ts, err := mime.ExtensionsByType(rev.BinaryMime)
-	if err != nil || ts == nil {
-		rev.BinaryName = rev.IdAsStr() + ".bin"
-	} else {
-		rev.BinaryName = rev.IdAsStr() + ts[0]
-	}
-	return rev.BinaryName
-}
-
-// desiredTextFilename returns string that represents filename to use when saving a text content file of a new revison.
-// It also sets the corresponding field in `rev`.
-func (rev *Revision) desiredTextFilename() string {
-	ts, err := mime.ExtensionsByType(rev.TextMime)
-	if err != nil || ts == nil {
-		log.Println("No idea how I should name this one:", rev.TextMime)
-		rev.TextName = rev.IdAsStr() + ".txt"
-	} else {
-		log.Println("A good extension would be one of these:", ts)
-		rev.TextName = rev.IdAsStr() + ts[0]
-	}
-	return rev.TextName
-}
-
-// AsHtml returns HTML representation of the revision.
-// If there is an error, it will be told about it in `w`.
-func (rev *Revision) AsHtml(w http.ResponseWriter) (ret string, err error) {
-	ret += `<article class="page">
-	<h1 class="page__title">` + rev.FullName + `</h1>
-`
-	// TODO: support things other than images
-	if rev.hasBinaryData() {
-		ret += fmt.Sprintf(`<img src="/%s?action=getBinary&rev=%d" class="page__amnt"/>`, rev.FullName, rev.Id)
-	}
-
-	contents, err := ioutil.ReadFile(rev.TextPath)
-	if err != nil {
-		log.Println("Failed to render", rev.FullName)
-		w.WriteHeader(http.StatusInternalServerError)
-		return "", err
-	}
-
-	// TODO: support more markups.
-	// TODO: support mycorrhiza extensions like transclusion.
-	switch rev.TextMime {
-	case "text/markdown":
-		html := markdown.ToHTML(contents, nil, nil)
-		ret += string(html)
-	default:
-		ret += fmt.Sprintf(`<pre>%s</pre>`, contents)
-	}
-
-	ret += `
-</article>`
-	return ret, nil
-}
-
-// ActionGetBinary is used with `?action=getBinary`.
-// It writes binary data of the revision. It also sets the MIME-type.
-func (rev *Revision) ActionGetBinary(w http.ResponseWriter) {
-	fileContents, err := ioutil.ReadFile(rev.BinaryPath)
-	if err != nil {
-		log.Println("Failed to load binary data of", rev.FullName, rev.Id)
-		w.WriteHeader(http.StatusNotFound)
-		return
-	}
-	w.Header().Set("Content-Type", rev.BinaryMime)
-	w.WriteHeader(http.StatusOK)
-	w.Write(fileContents)
-	log.Println("Serving binary data of", rev.FullName, rev.Id)
-}
-
-// ActionRaw is used with `?action=raw`.
-// It writes text content of the revision without any parsing or rendering.
-func (rev *Revision) ActionRaw(w http.ResponseWriter) {
-	fileContents, err := ioutil.ReadFile(rev.TextPath)
-	if err != nil {
-		return
-	}
-	w.Header().Set("Content-Type", rev.TextMime)
-	w.WriteHeader(http.StatusOK)
-	w.Write(fileContents)
-	log.Println("Serving text data of", rev.FullName, rev.Id)
-}
-
-// ActionZen is used with `?action=zen`.
-// It renders the revision without any layout or navigation.
-func (rev *Revision) ActionZen(w http.ResponseWriter) {
-	html, err := rev.AsHtml(w)
-	if err == nil {
-		fmt.Fprint(w, html)
-		log.Println("Rendering", rev.FullName, "in zen mode")
-	}
-}
-
-// ActionView is used with `?action=view` or without any action.
-// It renders the revision with layout and navigation.
-func (rev *Revision) ActionView(w http.ResponseWriter, layoutFun func(Revision, string) string) {
-	html, err := rev.AsHtml(w)
-	if err == nil {
-		fmt.Fprint(w, layoutFun(*rev, html))
-		log.Println("Rendering", rev.FullName)
-	}
-}
diff --git a/w/config.json b/w/config.json
index 48590d2..409bcd2 100644
--- a/w/config.json
+++ b/w/config.json
@@ -1,6 +1,6 @@
 {
 	"address": "127.0.0.1:1737", 
-	"theme": "default-dark",
+	"theme": "default-light", 
 	"site-title": "🍄 MycorrhizaWiki", 
 	"title-templates": {
 		"edit-hypha": "Edit %s at MycorrhizaWiki", 
diff --git a/w/favicon.ico b/w/favicon.ico
new file mode 100644
index 0000000..857e55c
Binary files /dev/null and b/w/favicon.ico differ
diff --git a/w/m/Fruit/3.markdown b/w/m/Fruit/3.markdown
new file mode 100644
index 0000000..e99cd53
--- /dev/null
+++ b/w/m/Fruit/3.markdown
@@ -0,0 +1,4 @@
+According to real *scientists*, fruit is a type of fetus. Most of them are tasty and cool, though some of them are really sour and depressing. Be careful when choosing fruit. Best ones are:
+
+* [Apple](Apple)
+* [Pear](Pear)
\ No newline at end of file
diff --git a/w/m/Fruit/Pineapple/1.html b/w/m/Fruit/Pineapple/1.html
new file mode 100644
index 0000000..61b3b19
--- /dev/null
+++ b/w/m/Fruit/Pineapple/1.html
@@ -0,0 +1 @@
+<b>Pineapple is apple from a pine</b>
\ No newline at end of file
diff --git a/w/m/Fruit/Pineapple/meta.json b/w/m/Fruit/Pineapple/meta.json
new file mode 100644
index 0000000..877bb4a
--- /dev/null
+++ b/w/m/Fruit/Pineapple/meta.json
@@ -0,0 +1,19 @@
+{
+	"views": 0,
+	"deleted": false,
+	"revisions": {
+		"1": {
+			"tags": [
+				""
+			],
+			"name": "Pineapple",
+			"comment": "Update Fruit/Pineapple",
+			"author": "",
+			"time": 1592997100,
+			"text_mime": "text/html",
+			"binary_mime": "",
+			"text_name": "1.html",
+			"binary_name": ""
+		}
+	}
+}
\ No newline at end of file
diff --git a/w/m/Fruit/meta.json b/w/m/Fruit/meta.json
index cb14bcf..b4d4797 100644
--- a/w/m/Fruit/meta.json
+++ b/w/m/Fruit/meta.json
@@ -1,22 +1,47 @@
 {
-"revisions":{
-	"1":{
-		"name":		"Fruit", 
-		"time":		1591635559, 
-		"author":	"bouncepaw", 
-		"comment":	"create Fruit", 
-		"tags":		["fetus", "tasty"], 
-		"text_mime":	"text/markdown", 
-		"text_name":	"1.md"
-	}, 
-	"2":{
-		"name":		"Fruit", 
-		"time":		1591636222,
-		"author":	"fungimaster", 
-		"comment":	"update Fruit", 
-		"tags":		["fetus", "tasty"], 
-		"text_mime":	"text/markdown", 
-		"text_name":	"2.md"
-	}
-}
-}
+	"views": 0,
+	"deleted": false,
+	"revisions": {
+		"1": {
+			"tags": [
+				"fetus",
+				"tasty"
+			],
+			"name": "Fruit",
+			"comment": "create Fruit",
+			"author": "bouncepaw",
+			"time": 1591635559,
+			"text_mime": "text/markdown",
+			"binary_mime": "",
+			"text_name": "1.md",
+			"binary_name": ""
+		},
+		"2": {
+			"tags": [
+				"fetus",
+				"tasty"
+			],
+			"name": "Fruit",
+			"comment": "update Fruit",
+			"author": "fungimaster",
+			"time": 1591636222,
+			"text_mime": "text/markdown",
+			"binary_mime": "",
+			"text_name": "2.md",
+			"binary_name": ""
+		},
+		"3": {
+			"tags": null,
+			"name": "Fruit",
+			"comment": "Update Fruit",
+			"author": "",
+			"time": 1593279957,
+			"text_mime": "text/markdown",
+			"binary_mime": "",
+			"text_name": "3.markdown",
+			"binary_name": ""
+		}
+	},
+	"Invalid": false,
+	"Err": null
+}
\ No newline at end of file
diff --git a/w/m/Templates/1.markdown b/w/m/Templates/1.markdown
new file mode 100644
index 0000000..bf3de04
--- /dev/null
+++ b/w/m/Templates/1.markdown
@@ -0,0 +1 @@
+**TODO:** Reorganize templates.
\ No newline at end of file
diff --git a/w/m/Templates/default-dark/Hypha/edit/index.html/1.html b/w/m/Templates/default-dark/Hypha/edit/index.html/1.html
index 842b43b..a102c1e 100644
--- a/w/m/Templates/default-dark/Hypha/edit/index.html/1.html
+++ b/w/m/Templates/default-dark/Hypha/edit/index.html/1.html
@@ -9,8 +9,7 @@
 			<h4 class="">Edit box</h4>
 			<!-- It is important that there is no indent ↓ -->
 			<textarea class="edit-box__text" name="text" cols="80" rows="25">
-{{ .Text }}
-			</textarea>
+{{ .Text }}</textarea>
 		</div>
 	</form>
 </div>
diff --git a/w/m/Templates/default-light/Hypha/edit/index.html/1.html b/w/m/Templates/default-light/Hypha/edit/index.html/1.html
index 49ab078..b98e6e9 100644
--- a/w/m/Templates/default-light/Hypha/edit/index.html/1.html
+++ b/w/m/Templates/default-light/Hypha/edit/index.html/1.html
@@ -1,36 +1,36 @@
-<div class="naviwrapper">
-	<form class="naviwrapper__edit edit-box"
-	      method="POST"
-	      enctype="multipart/form-data"
-	      action="?action=update">
-		<div class="naviwrapper__buttons">
-			<input type="submit" value="update"/>
-		</div>
-
-		<div class="edit-box__left">
-			<h4>Edit box</h4>
-			<!-- It is important that there is no indent ↓ -->
-			<textarea class="edit-box__text" name="text" cols="80" rows="25">
-{{ .Text }}
-			</textarea>
-
-			<h4>Upload file</h4>
-			<p>If this hypha has a file like that, the text above is meant to be a description of it</p>
-			<input type="file" name="binary"/>
-		</div>
-
-		<div class="edit-box__right">
-			<h4>Text MIME-type</h4>
-			<p>Good types are <code>text/markdown</code> and <code>text/plain</code></p>
-			<input type="text" name="text_mime" value="{{ .TextMime }}"/>
-
-			<h4>Revision comment</h4>
-			<p>Please make your comment helpful</p>
-			<input type="text" name="comment" value="Update {{ .Name }}"/>
-
-			<h4>Edit tags</h4>
-			<p>Tags are separated by commas, whitespace is ignored</p>
-			<input type="text" name="tags" value="{{ .Tags }}"/>
-		</div>
-	</form>
-</div>
+<div class="naviwrapper">
+	<form class="naviwrapper__edit edit-box"
+	      method="POST"
+	      enctype="multipart/form-data"
+	      action="?action=update">
+		<div class="naviwrapper__buttons">
+			<input type="submit" value="update"/>
+		</div>
+
+		<div class="edit-box__left">
+			<h4>Edit box</h4>
+			<!-- It is important that there is no indent ↓ -->
+			<textarea class="edit-box__text" name="text" cols="80" rows="25">
+{{ .Text }}
+			</textarea>
+
+			<h4>Upload file</h4>
+			<p>If this hypha has a file like that, the text above is meant to be a description of it</p>
+			<input type="file" name="binary"/>
+		</div>
+
+		<div class="edit-box__right">
+			<h4>Text MIME-type</h4>
+			<p>Good types are <code>text/markdown</code> and <code>text/plain</code></p>
+			<input type="text" name="text_mime" value="{{ .TextMime }}"/>
+
+			<h4>Revision comment</h4>
+			<p>Please make your comment helpful</p>
+			<input type="text" name="comment" value="Update {{ .Name }}"/>
+
+			<h4>Edit tags</h4>
+			<p>Tags are separated by commas, whitespace is ignored</p>
+			<input type="text" name="tags" value="{{ .Tags }}"/>
+		</div>
+	</form>
+</div>
diff --git a/w/m/Templates/default-light/Hypha/edit/sidebar.html/1.html b/w/m/Templates/default-light/Hypha/edit/sidebar.html/1.html
new file mode 100644
index 0000000..54053bd
--- /dev/null
+++ b/w/m/Templates/default-light/Hypha/edit/sidebar.html/1.html
@@ -0,0 +1,19 @@
+<div style=""><h4>Text MIME-type</h4>
+<p>Good types are <code>text/markdown</code> and <code>text/plain</code></p>
+<input type="text" name="text_mime" value="{{ .TextMime }}" form="edit-form"/>
+
+<h4>Revision comment</h4>
+<p>Please make your comment helpful</p>
+<input type="text" name="comment" value="Update {{ .Name }}" form="edit-form"/>
+
+<h4>Edit tags</h4>
+<p>Tags are separated by commas, whitespace is ignored</p>
+<input type="text" name="tags" value="{{ .Tags }}" form="edit-form"/>
+
+<h4>Upload file</h4>
+<p>If this hypha has a file like that, the text above is meant to be a description of it</p>
+<input type="file" name="binary" form="edit-form"/>
+
+
+<p><input type="submit" value="update" form="edit-form"/></p>
+</div>
diff --git a/w/m/Templates/default-light/Hypha/edit/sidebar.html/meta.json b/w/m/Templates/default-light/Hypha/edit/sidebar.html/meta.json
new file mode 100644
index 0000000..1fe3342
--- /dev/null
+++ b/w/m/Templates/default-light/Hypha/edit/sidebar.html/meta.json
@@ -0,0 +1,19 @@
+{
+	"views": 0,
+	"deleted": false,
+	"revisions": {
+		"1": {
+			"tags": [
+				""
+			],
+			"name": "sidebar.html",
+			"comment": "Create Templates/default-dark/Hypha/edit/sidebar.html",
+			"author": "",
+			"time": 1593003792,
+			"text_mime": "text/html",
+			"binary_mime": "",
+			"text_name": "1.html",
+			"binary_name": ""
+		}
+	}
+}
diff --git a/w/m/Templates/meta.json b/w/m/Templates/meta.json
new file mode 100644
index 0000000..45204e2
--- /dev/null
+++ b/w/m/Templates/meta.json
@@ -0,0 +1,21 @@
+{
+	"views": 0,
+	"deleted": false,
+	"revisions": {
+		"1": {
+			"tags": [
+				""
+			],
+			"name": "Templates",
+			"comment": "Update Templates",
+			"author": "",
+			"time": 1593194769,
+			"text_mime": "text/markdown",
+			"binary_mime": "",
+			"text_name": "1.markdown",
+			"binary_name": ""
+		}
+	},
+	"Invalid": false,
+	"Err": null
+}
\ No newline at end of file
diff --git a/walk.go b/walk.go
deleted file mode 100644
index d23c454..0000000
--- a/walk.go
+++ /dev/null
@@ -1,120 +0,0 @@
-package main
-
-import (
-	"encoding/json"
-	"io/ioutil"
-	"log"
-	"path/filepath"
-	"regexp"
-	"strconv"
-
-	"github.com/bouncepaw/mycorrhiza/cfg"
-)
-
-const (
-	hyphaPattern    = `[^\s\d:/?&\\][^:?&\\]*`
-	hyphaUrl        = `/{hypha:` + hyphaPattern + `}`
-	revisionPattern = `[\d]+`
-	revQuery        = `{rev:` + revisionPattern + `}`
-	metaJsonPattern = `meta\.json`
-)
-
-var (
-	leadingInt = regexp.MustCompile(`^[-+]?\d+`)
-)
-
-// matchNameToEverything matches `name` to all filename patterns and returns 4 boolean results.
-func matchNameToEverything(name string) (metaJsonM, hyphaM bool) {
-	// simpleMatch reduces boilerplate. Errors are ignored because I trust my regex skills.
-	simpleMatch := func(s string, p string) bool {
-		m, _ := regexp.MatchString(p, s)
-		return m
-	}
-	return simpleMatch(name, metaJsonPattern),
-		simpleMatch(name, hyphaPattern)
-}
-
-// scanHyphaDir scans directory at `fullPath` and tells what it has found.
-func scanHyphaDir(fullPath string) (valid bool, possibleSubhyphae []string, metaJsonPath string, err error) {
-	nodes, err := ioutil.ReadDir(fullPath)
-	if err != nil {
-		return // implicit return values
-	}
-
-	for _, node := range nodes {
-		metaJsonM, hyphaM := matchNameToEverything(node.Name())
-		switch {
-		case hyphaM && node.IsDir():
-			possibleSubhyphae = append(possibleSubhyphae, filepath.Join(fullPath, node.Name()))
-		case metaJsonM && !node.IsDir():
-			metaJsonPath = filepath.Join(fullPath, "meta.json")
-			// Other nodes are ignored. It is not promised they will be ignored in future versions
-		}
-	}
-
-	if metaJsonPath != "" {
-		valid = true
-	}
-	return // implicit return values
-}
-
-// hyphaName gets name of a hypha by stripping path to the hypha in `fullPath`
-func hyphaName(fullPath string) string {
-	// {cfg.WikiDir}/{the name}
-	return fullPath[len(cfg.WikiDir)+1:]
-}
-
-// recurFindHyphae recursively searches for hyphae in passed directory path.
-func recurFindHyphae(fullPath string) map[string]*Hypha {
-	hyphae := make(map[string]*Hypha)
-	valid, possibleSubhyphae, metaJsonPath, err := scanHyphaDir(fullPath)
-	if err != nil {
-		return hyphae
-	}
-
-	// First, let's process subhyphae
-	for _, possibleSubhypha := range possibleSubhyphae {
-		for k, v := range recurFindHyphae(possibleSubhypha) {
-			hyphae[k] = v
-		}
-	}
-
-	// This folder is not a hypha itself, nothing to do here
-	if !valid {
-		return hyphae
-	}
-
-	// Template hypha struct. Other fields are default json values.
-	h := Hypha{
-		FullName:   hyphaName(fullPath),
-		Path:       fullPath,
-		parentName: filepath.Dir(hyphaName(fullPath)),
-		// Children names are unknown now
-	}
-
-	metaJsonContents, err := ioutil.ReadFile(metaJsonPath)
-	if err != nil {
-		log.Printf("Error when reading `%s`; skipping", metaJsonPath)
-		return hyphae
-	}
-	err = json.Unmarshal(metaJsonContents, &h)
-	if err != nil {
-		log.Printf("Error when unmarshaling `%s`; skipping", metaJsonPath)
-		log.Println(err)
-		return hyphae
-	}
-
-	// fill in rooted paths to content files and full names
-	for idStr, rev := range h.Revisions {
-		rev.FullName = filepath.Join(h.parentName, rev.ShortName)
-		rev.Id, _ = strconv.Atoi(idStr)
-		if rev.BinaryName != "" {
-			rev.BinaryPath = filepath.Join(fullPath, rev.BinaryName)
-		}
-		rev.TextPath = filepath.Join(fullPath, rev.TextName)
-	}
-
-	// Now the hypha should be ok, gotta send structs
-	hyphae[h.FullName] = &h
-	return hyphae
-}