diff --git a/fs/hypha.go b/fs/hypha.go
index 3f198f2..7b0abb2 100644
--- a/fs/hypha.go
+++ b/fs/hypha.go
@@ -7,9 +7,11 @@ import (
 	"io/ioutil"
 	"log"
 	"net/http"
+	"os"
 	"path/filepath"
 	"strconv"
 	"strings"
+	"time"
 
 	"github.com/bouncepaw/mycorrhiza/cfg"
 )
@@ -21,6 +23,22 @@ type Hypha struct {
 	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 (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 {
@@ -53,7 +71,7 @@ func (h *Hypha) TextContent() string {
 	return fmt.Sprintf(cfg.DescribeHyphaHerePattern, h.FullName)
 }
 
-func (s *Storage) Open(name string) (*Hypha, error) {
+func (s *Storage) Open(name string) *Hypha {
 	h := &Hypha{
 		Exists:   true,
 		FullName: name,
@@ -67,14 +85,12 @@ func (s *Storage) Open(name string) (*Hypha, error) {
 	} else {
 		metaJsonText, err := ioutil.ReadFile(filepath.Join(path, "meta.json"))
 		if err != nil {
-			log.Fatal(err)
-			return nil, err
+			return h.Invalidate(err)
 		}
 
 		err = json.Unmarshal(metaJsonText, &h)
 		if err != nil {
-			log.Fatal(err)
-			return nil, err
+			return h.Invalidate(err)
 		}
 		// fill in rooted paths to content files and full names
 		for idStr, rev := range h.Revisions {
@@ -86,10 +102,9 @@ func (s *Storage) Open(name string) (*Hypha, error) {
 			rev.TextPath = filepath.Join(path, rev.TextName)
 		}
 
-		err = h.OnRevision("0")
-		return h, err
+		return h.OnRevision("0")
 	}
-	return h, nil
+	return h
 }
 
 func (h *Hypha) parentName() string {
@@ -101,9 +116,12 @@ func (h *Hypha) metaJsonPath() string {
 }
 
 // OnRevision tries to change to a revision specified by `id`.
-func (h *Hypha) OnRevision(id string) error {
+func (h *Hypha) OnRevision(id string) *Hypha {
+	if h.Invalid || !h.Exists {
+		return h
+	}
 	if len(h.Revisions) == 0 {
-		return errors.New("This hypha has no revisions")
+		return h.Invalidate(errors.New("This hypha has no revisions"))
 	}
 	if id == "0" {
 		id = h.NewestId()
@@ -112,7 +130,7 @@ func (h *Hypha) OnRevision(id string) error {
 	if rev, _ := h.Revisions[id]; true {
 		h.actual = rev
 	}
-	return nil
+	return h
 }
 
 // NewestId finds the largest id among all revisions.
@@ -214,3 +232,147 @@ func (h *Hypha) ActionView(w http.ResponseWriter, renderExists, renderNotExists
 	}
 	h.PlainLog("Rendering hypha view")
 }
+
+// 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
index 67f0346..69ae0c6 100644
--- a/fs/revision.go
+++ b/fs/revision.go
@@ -1,5 +1,10 @@
 package fs
 
+import (
+	"mime"
+	"strconv"
+)
+
 type Revision struct {
 	Id         int      `json:"-"`
 	FullName   string   `json:"-"`
@@ -15,3 +20,23 @@ type Revision struct {
 	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/genealogy.gog b/genealogy.gog
deleted file mode 100644
index 8b2a0af..0000000
--- a/genealogy.gog
+++ /dev/null
@@ -1,107 +0,0 @@
-/* Genealogy is all about relationships between hyphae.*/
-package main
-
-import (
-	"fmt"
-	"log"
-	"path/filepath"
-	"sort"
-	"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)
-}
-
-// If Name == "", the tree is empty.
-type Tree struct {
-	Name        string
-	Ancestors   []string
-	Siblings    []string
-	Descendants []*Tree
-	Root        bool
-}
-
-// 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 {
-	t := &Tree{Name: name, Root: root}
-	for hyphaName, _ := range hyphae {
-		t.compareNamesAndAppend(hyphaName)
-	}
-	sort.Slice(t.Ancestors, func(i, j int) bool {
-		return strings.Count(t.Ancestors[i], "/") < strings.Count(t.Ancestors[j], "/")
-	})
-	sort.Strings(t.Siblings)
-	sort.Slice(t.Descendants, func(i, j int) bool {
-		a := t.Descendants[i].Name
-		b := t.Descendants[j].Name
-		return len(a) < len(b)
-	})
-	log.Printf("Generate tree for %v: %v %v\n", t.Name, t.Ancestors, t.Siblings)
-	return t
-}
-
-// Compares names appends name2 to an array of `t`:
-func (t *Tree) compareNamesAndAppend(name2 string) {
-	switch {
-	case t.Name == name2:
-	case strings.HasPrefix(t.Name, name2):
-		t.Ancestors = append(t.Ancestors, name2)
-	case t.Root && (strings.Count(t.Name, "/") == strings.Count(name2, "/") &&
-		(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))
-	}
-}
-
-// 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) {
-	if t.Name == "" {
-		return ""
-	}
-	html += `<ul class="navitree__node">`
-	if t.Root {
-		for _, ancestor := range t.Ancestors {
-			html += navitreeEntry(ancestor)
-		}
-	}
-	html += navitreeEntry(t.Name)
-
-	if t.Root {
-		for _, siblingName := range t.Siblings {
-			html += navitreeEntry(siblingName)
-		}
-	}
-
-	for _, subtree := range t.Descendants {
-		html += subtree.AsHtml()
-	}
-
-	html += `</ul>`
-	return html
-}
-
-// navitreeEntry is a small utility function that makes generating html easier.
-// Someone please redo it in templates.
-func navitreeEntry(name string) string {
-	return fmt.Sprintf(`<li class="navitree__entry">
-	<a class="navitree__link" href="/%s">%s</a>
-</li>
-`, name, filepath.Base(name))
-}
diff --git a/handlers.go b/handlers.go
index 6f1fe71..1dbe3f0 100644
--- a/handlers.go
+++ b/handlers.go
@@ -20,14 +20,10 @@ import (
 // Boilerplate code present in many handlers. Good to have it.
 func HandlerBase(w http.ResponseWriter, rq *http.Request) (*fs.Hypha, bool) {
 	vars := mux.Vars(rq)
-	h, err := fs.Hs.Open(vars["hypha"])
-	if err != nil {
-		log.Println(err)
-		return nil, false
-	}
-	err = h.OnRevision(RevInMap(vars))
-	if err != nil {
-		log.Println(err)
+	h := fs.Hs.Open(vars["hypha"]).OnRevision(RevInMap(vars))
+	if h.Invalid {
+		log.Println(h.Err)
+		return h, false
 	}
 	return h, true
 }
@@ -60,153 +56,30 @@ func HandlerView(w http.ResponseWriter, rq *http.Request) {
 
 func HandlerEdit(w http.ResponseWriter, rq *http.Request) {
 	vars := mux.Vars(rq)
-	h, err := fs.Hs.Open(vars["hypha"])
-	// How could this happen?
-	if err != nil {
-		log.Println(err)
-		return
-	}
-	h.OnRevision("0")
+	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)))
 }
 
-/*
-// 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
-}
-
 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()
 
-	err := writeTextFileFromHttpData(newRev, rq)
-	if err != nil {
-		log.Println(err)
+	if h.Invalid {
+		log.Println(h.Err)
 		return
 	}
-	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")))
+	w.Write([]byte(render.HyphaUpdateOk(h)))
 }
-*/
diff --git a/hypha.gog b/hypha.gog
deleted file mode 100644
index bbdc6ee..0000000
--- a/hypha.gog
+++ /dev/null
@@ -1,74 +0,0 @@
-package main
-
-import (
-	"encoding/json"
-	"fmt"
-	"io/ioutil"
-	"log"
-	"net/http"
-	"os"
-	"path/filepath"
-	"strconv"
-	"strings"
-
-	"github.com/bouncepaw/mycorrhiza/cfg"
-)
-
-// 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)
-}
-
-// 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 09a3682..215646c 100644
--- a/main.go
+++ b/main.go
@@ -66,10 +66,8 @@ func main() {
 	r.Queries("action", "edit").Path(cfg.HyphaUrl).
 		HandlerFunc(HandlerEdit)
 
-		/*
-			r.Queries("action", "update").Path(hyphaUrl).Methods("POST").
-				HandlerFunc(HandlerUpdate)
-		*/
+	r.Queries("action", "update").Path(cfg.HyphaUrl).Methods("POST").
+		HandlerFunc(HandlerUpdate)
 
 	r.HandleFunc(cfg.HyphaUrl, HandlerView)
 
diff --git a/render.gog b/render.gog
deleted file mode 100644
index dc9d13a..0000000
--- a/render.gog
+++ /dev/null
@@ -1,96 +0,0 @@
-package main
-
-import (
-	"bytes"
-	"fmt"
-	"path"
-	"text/template"
-
-	"github.com/bouncepaw/mycorrhiza/cfg"
-)
-
-// EditHyphaPage returns HTML page of hypha editor.
-func EditHyphaPage(name, textMime, content, tags string) string {
-	keys := map[string]string{
-		"Title":   fmt.Sprintf(cfg.TitleEditTemplate, name),
-		"Header":  renderFromString(name, "Hypha/edit/header.html"),
-		"Sidebar": renderFromString("", "Hypha/edit/sidebar.html"),
-	}
-	page := map[string]string{
-		"Text":     content,
-		"TextMime": textMime,
-		"Name":     name,
-		"Tags":     tags,
-	}
-	return renderBase(renderFromMap(page, "Hypha/edit/index.html"), keys)
-}
-
-// Hypha404 returns 404 page for nonexistent page.
-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")
-}
-
-// 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(),
-	}, "Hypha/view/sidebar.html"); aside != "" {
-		sidebar = aside
-	}
-	keys := map[string]string{
-		"Title":   fmt.Sprintf(cfg.TitleTemplate, name),
-		"Sidebar": sidebar,
-	}
-	return renderBase(renderFromString(content, templatePath), keys)
-}
-
-// renderBase collects and renders page from base template
-// Args:
-//   content: string or pre-rendered template
-//   keys: map with replaced standart fields
-func renderBase(content string, keys map[string]string) string {
-	page := map[string]string{
-		"Title":     cfg.SiteTitle,
-		"Main":      "",
-		"SiteTitle": cfg.SiteTitle,
-	}
-	for key, val := range keys {
-		page[key] = val
-	}
-	page["Main"] = content
-	return renderFromMap(page, "base.html")
-}
-
-// renderFromMap applies `data` map to template in `templatePath` and returns the result.
-func renderFromMap(data map[string]string, templatePath string) string {
-	filePath := path.Join(cfg.TemplatesDir, templatePath)
-	tmpl, err := template.ParseFiles(filePath)
-	if err != nil {
-		return err.Error()
-	}
-	buf := new(bytes.Buffer)
-	if err := tmpl.Execute(buf, data); err != nil {
-		return err.Error()
-	}
-	return buf.String()
-}
-
-// renderFromMap applies `data` string to template in `templatePath` and returns the result.
-func renderFromString(data string, templatePath string) string {
-	filePath := path.Join(cfg.TemplatesDir, templatePath)
-	tmpl, err := template.ParseFiles(filePath)
-	if err != nil {
-		return err.Error()
-	}
-	buf := new(bytes.Buffer)
-	if err := tmpl.Execute(buf, data); err != nil {
-		return err.Error()
-	}
-	return buf.String()
-}
diff --git a/render/render.go b/render/render.go
index 9af9434..7ff6a05 100644
--- a/render/render.go
+++ b/render/render.go
@@ -66,6 +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
@@ -86,8 +93,7 @@ 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)
-	h, _ := fs.Hs.Open(hyphPath)
-	h.OnRevision("0")
+	h := fs.Hs.Open(hyphPath).OnRevision("0")
 	tmpl, err := template.ParseFiles(h.TextPath())
 	if err != nil {
 		return err.Error()
@@ -102,8 +108,7 @@ 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)
-	h, _ := fs.Hs.Open(hyphPath)
-	h.OnRevision("0")
+	h := fs.Hs.Open(hyphPath).OnRevision("0")
 	tmpl, err := template.ParseFiles(h.TextPath())
 	if err != nil {
 		return err.Error()
diff --git a/revision.gog b/revision.gog
deleted file mode 100644
index 3117b2a..0000000
--- a/revision.gog
+++ /dev/null
@@ -1,135 +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)
-}
-
-// 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 3497a5a..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/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-light/Hypha/edit/index.html/1.html b/w/m/Templates/default-light/Hypha/edit/index.html/1.html
index 943cf5f..d12ced6 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
@@ -2,7 +2,8 @@
 	<form class="naviwrapper__edit edit-box"
 	      method="POST"
 	      enctype="multipart/form-data"
-	      action="?action=update">
+	      action="?action=update"
+	      id="edit-form">
 
 		<div class="edit-box__left">
 			<h4>Edit box</h4>
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
index 3f257cf..54053bd 100644
--- a/w/m/Templates/default-light/Hypha/edit/sidebar.html/1.html
+++ b/w/m/Templates/default-light/Hypha/edit/sidebar.html/1.html
@@ -1,19 +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 }}"/>
+<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 }}"/>
+<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 }}"/>
+<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"/>
+<input type="file" name="binary" form="edit-form"/>
 
 
-<p><input type="submit" value="update"/></p>
+<p><input type="submit" value="update" form="edit-form"/></p>
 </div>
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.gog b/walk.gog
deleted file mode 100644
index d23c454..0000000
--- a/walk.gog
+++ /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
-}