Merge pull request #21 from bouncepaw/0.9

Version 0.9
2025-01-18 22:52:50 +00:00 · 2020-10-03 22:01:16 +05:00 · 2020-10-03 22:01:16 +05:00 · b6896829c0
commit b6896829c0
parent 79868cebf8 62fcd6d9bc
24 changed files with 1267 additions and 330 deletions
--- a/README.md
+++ b/README.md
@ -1,6 +1,13 @@
-# 🍄 MycorrhizaWiki 0.8
+# 🍄 MycorrhizaWiki 0.9
 A wiki engine.

+## 0.9
+This is a development branch for 0.9 version. Features I want to implement in this release:
+* [x] Recent changes page.
+* [x] Hypha deletion.
+* [x] Hypha renaming.
+* [x] Support async git ops.
+
 ## Installation
 ```sh
 git clone --recurse-submodules https://github.com/bouncepaw/mycorrhiza
@ -31,5 +38,4 @@ Help is always needed. We have a [tg chat](https://t.me/mycorrhizadev) where som
 * Tagging system
 * Authorization
 * Better history viewing
-* Recent changes page
 * More markups
--- a/go.mod
+++ b/go.mod
@ -2,4 +2,4 @@ module github.com/bouncepaw/mycorrhiza

 go 1.14

-require github.com/valyala/quicktemplate v1.6.2
+require github.com/valyala/quicktemplate v1.6.3
--- a/go.sum
+++ b/go.sum
@ -1,11 +1,11 @@
 github.com/andybalholm/brotli v1.0.0/go.mod h1:loMXtMfwqflxFJPmdbJO0a3KNoPuLBgiu3qAvBg8x/Y=
 github.com/klauspost/compress v1.10.7/go.mod h1:aoV0uJVorq1K+umq18yTdKaF57EivdYsUV+/s2qKfXs=
-github.com/klauspost/compress v1.10.10/go.mod h1:aoV0uJVorq1K+umq18yTdKaF57EivdYsUV+/s2qKfXs=
+github.com/klauspost/compress v1.11.0/go.mod h1:aoV0uJVorq1K+umq18yTdKaF57EivdYsUV+/s2qKfXs=
 github.com/valyala/bytebufferpool v1.0.0 h1:GqA5TC/0021Y/b9FG4Oi9Mr3q7XYx6KllzawFIhcdPw=
 github.com/valyala/bytebufferpool v1.0.0/go.mod h1:6bBcMArwyJ5K/AmCkWv1jt77kVWyCJ6HpOuEn7z0Csc=
-github.com/valyala/fasthttp v1.15.1/go.mod h1:YOKImeEosDdBPnxc0gy7INqi3m1zK6A+xl6TwOBhHCA=
-github.com/valyala/quicktemplate v1.6.2 h1:k0vgK7zlmFzqAoIBIOrhrfmZ6JoTGJlLRPLbkPGr2/M=
-github.com/valyala/quicktemplate v1.6.2/go.mod h1:mtEJpQtUiBV0SHhMX6RtiJtqxncgrfmjcUy5T68X8TM=
+github.com/valyala/fasthttp v1.16.0/go.mod h1:YOKImeEosDdBPnxc0gy7INqi3m1zK6A+xl6TwOBhHCA=
+github.com/valyala/quicktemplate v1.6.3 h1:O7EuMwuH7Q94U2CXD6sOX8AYHqQqWtmIk690IhmpkKA=
+github.com/valyala/quicktemplate v1.6.3/go.mod h1:fwPzK2fHuYEODzJ9pkw0ipCPNHZ2tD5KW4lOuSdPKzY=
 github.com/valyala/tcplisten v0.0.0-20161114210144-ceec8f93295a/go.mod h1:v3UYOV9WzVtRmSR+PDvWpU/qWl4Wa5LApYYX4ZtKbio=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/net v0.0.0-20200602114024-627f9648deb9/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A=
--- a/history/history.go
+++ b/history/history.go
@ -6,6 +6,7 @@ import (
 	"log"
 	"os/exec"
 	"strconv"
+	"strings"
 	"time"

 	"github.com/bouncepaw/mycorrhiza/util"
@ -31,6 +32,58 @@ type Revision struct {
 	Message  string
 }

+// TimeString returns a human readable time representation.
+func (rev Revision) TimeString() string {
+	return rev.Time.Format(time.RFC822)
+}
+
+// HyphaeLinks returns a comma-separated list of hyphae that were affected by this revision as HTML string.
+func (rev Revision) HyphaeLinks() (html string) {
+	// diff-tree --no-commit-id --name-only -r
+	var (
+		// List of files affected by this revision, one per line.
+		out, err = gitsh("diff-tree", "--no-commit-id", "--name-only", "-r", rev.Hash)
+		// set is used to determine if a certain hypha has been already noted (hyphae are stored in 2 files at most).
+		set       = make(map[string]bool)
+		isNewName = func(hyphaName string) bool {
+			if _, present := set[hyphaName]; present {
+				return false
+			} else {
+				set[hyphaName] = true
+				return true
+			}
+		}
+	)
+	if err != nil {
+		return ""
+	}
+	for _, filename := range strings.Split(out.String(), "\n") {
+		// If filename has an ampersand:
+		if strings.IndexRune(filename, '&') >= 0 {
+			// Remove ampersanded suffix from filename:
+			ampersandPos := strings.LastIndexByte(filename, '&')
+			hyphaName := string([]byte(filename)[0:ampersandPos]) // is it safe?
+			if isNewName(hyphaName) {
+				// Entries are separated by commas
+				if len(set) > 1 {
+					html += `<span aria-hidden="true">, </span>`
+				}
+				html += fmt.Sprintf(`<a href="/rev/%[1]s/%[2]s">%[2]s</a>`, rev.Hash, hyphaName)
+			}
+		}
+	}
+	return html
+}
+
+func (rev Revision) RecentChangesEntry() (html string) {
+	return fmt.Sprintf(`
+<li><time>%s</time></li>
+<li>%s</li>
+<li>%s</li>
+<li>%s</li>
+`, rev.TimeString(), rev.Hash, rev.HyphaeLinks(), rev.Message)
+}
+
 // Path to git executable. Set at init()
 var gitpath string

@ -46,10 +99,10 @@ func init() {
 }

 // I pronounce it as [gɪt͡ʃ].
+// gitsh is async-safe, therefore all other git-related functions in this module are too.
 func gitsh(args ...string) (out bytes.Buffer, err error) {
 	fmt.Printf("$ %v\n", args)
 	cmd := exec.Command(gitpath, args...)
-
 	cmd.Dir = util.WikiDir

 	b, err := cmd.CombinedOutput()
--- a/history/information.go
+++ b/history/information.go
@ -5,10 +5,33 @@ package history
 import (
 	"fmt"
 	"regexp"
+	"strconv"
 	"strings"
-	"time"
+
+	"github.com/bouncepaw/mycorrhiza/templates"
 )

+func RecentChanges(n int) string {
+	var (
+		out, err = gitsh(
+			"log", "--oneline", "--no-merges",
+			"--pretty=format:\"%h\t%ce\t%ct\t%s\"",
+			"--max-count="+strconv.Itoa(n),
+		)
+		revs []Revision
+	)
+	if err == nil {
+		for _, line := range strings.Split(out.String(), "\n") {
+			revs = append(revs, parseRevisionLine(line))
+		}
+	}
+	entries := make([]string, len(revs))
+	for i, rev := range revs {
+		entries[i] = rev.RecentChangesEntry()
+	}
+	return templates.RecentChangesHTML(entries, n)
+}
+
 // Revisions returns slice of revisions for the given hypha name.
 func Revisions(hyphaName string) ([]Revision, error) {
 	var (
@ -22,7 +45,9 @@ func Revisions(hyphaName string) ([]Revision, error) {
 	)
 	if err == nil {
 		for _, line := range strings.Split(out.String(), "\n") {
-			revs = append(revs, parseRevisionLine(line))
+			if line != "" {
+				revs = append(revs, parseRevisionLine(line))
+			}
 		}
 	}
 	return revs, err
@ -48,7 +73,7 @@ func (rev *Revision) AsHtmlTableRow(hyphaName string) string {
 	<td><time>%s</time></td>
 	<td><a href="/rev/%s/%s">%s</a></td>
 	<td>%s</td>
-</tr>`, rev.Time.Format(time.RFC822), rev.Hash, hyphaName, rev.Hash, rev.Message)
+</tr>`, rev.TimeString(), rev.Hash, hyphaName, rev.Hash, rev.Message)
 }

 // See how the file with `filepath` looked at commit with `hash`.
--- a/history/operations.go
+++ b/history/operations.go
@ -4,10 +4,16 @@ package history

 import (
 	"fmt"
+	"os"
+	"path/filepath"
+	"sync"

 	"github.com/bouncepaw/mycorrhiza/util"
 )

+// gitMutex is used for blocking git operations to avoid clashes.
+var gitMutex = sync.Mutex{}
+
 // OpType is the type a history operation has. Callers shall set appropriate optypes when creating history operations.
 type OpType int

@ -15,6 +21,8 @@ const (
 	TypeNone OpType = iota
 	TypeEditText
 	TypeEditBinary
+	TypeDeleteHypha
+	TypeRenameHypha
 )

 // HistoryOp is an object representing a history operation.
@ -29,6 +37,7 @@ type HistoryOp struct {

 // Operation is a constructor of a history operation.
 func Operation(opType OpType) *HistoryOp {
+	gitMutex.Lock()
 	hop := &HistoryOp{
 		Errs:   []error{},
 		opType: opType,
@ -46,6 +55,28 @@ func (hop *HistoryOp) gitop(args ...string) *HistoryOp {
 	return hop
 }

+// WithFilesRemoved git-rm-s all passed `paths`. Paths can be rooted or not. Paths that are empty strings are ignored.
+func (hop *HistoryOp) WithFilesRemoved(paths ...string) *HistoryOp {
+	args := []string{"rm", "--quiet", "--"}
+	for _, path := range paths {
+		if path != "" {
+			args = append(args, path)
+		}
+	}
+	return hop.gitop(args...)
+}
+
+// WithFilesRenamed git-mv-s all passed keys of `pairs` to values of `pairs`. Paths can be rooted ot not. Empty keys are ignored.
+func (hop *HistoryOp) WithFilesRenamed(pairs map[string]string) *HistoryOp {
+	for from, to := range pairs {
+		if from != "" {
+			os.MkdirAll(filepath.Dir(to), 0777)
+			hop.gitop(append([]string{"mv"}, from, to)...)
+		}
+	}
+	return hop
+}
+
 // WithFiles stages all passed `paths`. Paths can be rooted or not.
 func (hop *HistoryOp) WithFiles(paths ...string) *HistoryOp {
 	for i, path := range paths {
@ -62,6 +93,7 @@ func (hop *HistoryOp) Apply() *HistoryOp {
 		"--author='"+hop.name+" <"+hop.email+">'",
 		"--message="+hop.userMsg,
 	)
+	gitMutex.Unlock()
 	return hop
 }

--- a/http_mutators.go
+++ b/http_mutators.go
@ -17,6 +17,89 @@ func init() {
 	http.HandleFunc("/upload-binary/", handlerUploadBinary)
 	http.HandleFunc("/upload-text/", handlerUploadText)
 	http.HandleFunc("/edit/", handlerEdit)
+	http.HandleFunc("/delete-ask/", handlerDeleteAsk)
+	http.HandleFunc("/delete-confirm/", handlerDeleteConfirm)
+	http.HandleFunc("/rename-ask/", handlerRenameAsk)
+	http.HandleFunc("/rename-confirm/", handlerRenameConfirm)
+}
+
+func handlerRenameAsk(w http.ResponseWriter, rq *http.Request) {
+	log.Println(rq.URL)
+	var (
+		hyphaName = HyphaNameFromRq(rq, "rename-ask")
+		_, isOld  = HyphaStorage[hyphaName]
+	)
+	util.HTTP200Page(w, base("Rename "+hyphaName+"?", templates.RenameAskHTML(hyphaName, isOld)))
+}
+
+func handlerRenameConfirm(w http.ResponseWriter, rq *http.Request) {
+	log.Println(rq.URL)
+	var (
+		hyphaName        = HyphaNameFromRq(rq, "rename-confirm")
+		hyphaData, isOld = HyphaStorage[hyphaName]
+		newName          = CanonicalName(rq.PostFormValue("new-name"))
+		_, newNameIsUsed = HyphaStorage[newName]
+		recursive        bool
+	)
+	if rq.PostFormValue("recursive") == "true" {
+		recursive = true
+	}
+	switch {
+	case newNameIsUsed:
+		HttpErr(w, http.StatusBadRequest, hyphaName, "Error: hypha exists",
+			fmt.Sprintf("Hypha named <a href='/page/%s'>%s</a> already exists.", hyphaName, hyphaName))
+	case newName == "":
+		HttpErr(w, http.StatusBadRequest, hyphaName, "Error: no name",
+			"No new name is given.")
+	case !isOld:
+		HttpErr(w, http.StatusBadRequest, hyphaName, "Error: no such hypha",
+			"Cannot rename a hypha that does not exist yet.")
+	case !HyphaPattern.MatchString(newName):
+		HttpErr(w, http.StatusBadRequest, hyphaName, "Error: invalid name",
+			"Invalid new name. Names cannot contain characters <code>^?!:#@&gt;&lt;*|\"\\'&amp;%</code>")
+	default:
+		if hop := hyphaData.RenameHypha(hyphaName, newName, recursive); len(hop.Errs) == 0 {
+			http.Redirect(w, rq, "/page/"+newName, http.StatusSeeOther)
+		} else {
+			HttpErr(w, http.StatusInternalServerError, hyphaName,
+				"Error: could not rename hypha",
+				fmt.Sprintf("Could not rename this hypha due to an internal error. Server errors: <code>%v</code>", hop.Errs))
+		}
+	}
+}
+
+// handlerDeleteAsk shows a delete dialog.
+func handlerDeleteAsk(w http.ResponseWriter, rq *http.Request) {
+	log.Println(rq.URL)
+	var (
+		hyphaName = HyphaNameFromRq(rq, "delete-ask")
+		_, isOld  = HyphaStorage[hyphaName]
+	)
+	util.HTTP200Page(w, base("Delete "+hyphaName+"?", templates.DeleteAskHTML(hyphaName, isOld)))
+}
+
+// handlerDeleteConfirm deletes a hypha for sure
+func handlerDeleteConfirm(w http.ResponseWriter, rq *http.Request) {
+	log.Println(rq.URL)
+	var (
+		hyphaName        = HyphaNameFromRq(rq, "delete-confirm")
+		hyphaData, isOld = HyphaStorage[hyphaName]
+	)
+	if isOld {
+		// If deleted successfully
+		if hop := hyphaData.DeleteHypha(hyphaName); len(hop.Errs) == 0 {
+			http.Redirect(w, rq, "/page/"+hyphaName, http.StatusSeeOther)
+		} else {
+			HttpErr(w, http.StatusInternalServerError, hyphaName,
+				"Error: could not delete hypha",
+				fmt.Sprintf("Could not delete this hypha due to an internal error. Server errors: <code>%v</code>", hop.Errs))
+		}
+	} else {
+		// The precondition is to have the hypha in the first place.
+		HttpErr(w, http.StatusPreconditionFailed, hyphaName,
+			"Error: no such hypha",
+			"Could not delete this hypha because it does not exist.")
+	}
 }

 // handlerEdit shows the edit form. It doesn't edit anything actually.
--- a/http_readers.go
+++ b/http_readers.go
@ -6,7 +6,6 @@ import (
 	"log"
 	"net/http"
 	"os"
-	"path"
 	"strings"

 	"github.com/bouncepaw/mycorrhiza/gemtext"
@ -29,8 +28,9 @@ func handlerRevision(w http.ResponseWriter, rq *http.Request) {
 	log.Println(rq.URL)
 	var (
 		shorterUrl        = strings.TrimPrefix(rq.URL.Path, "/rev/")
-		revHash           = path.Dir(shorterUrl)
-		hyphaName         = CanonicalName(strings.TrimPrefix(shorterUrl, revHash+"/"))
+		firstSlashIndex   = strings.IndexRune(shorterUrl, '/')
+		revHash           = shorterUrl[:firstSlashIndex]
+		hyphaName         = CanonicalName(shorterUrl[firstSlashIndex+1:])
 		contents          = fmt.Sprintf(`<p>This hypha had no text at this revision.</p>`)
 		textPath          = hyphaName + "&.gmi"
 		textContents, err = history.FileAtRevision(textPath, revHash)
@ -55,15 +55,15 @@ func handlerHistory(w http.ResponseWriter, rq *http.Request) {
 	log.Println(rq.URL)
 	hyphaName := HyphaNameFromRq(rq, "history")
 	var tbody string
-	if _, ok := HyphaStorage[hyphaName]; ok {
-		revs, err := history.Revisions(hyphaName)
-		if err == nil {
-			for _, rev := range revs {
-				tbody += rev.AsHtmlTableRow(hyphaName)
-			}
+
+	// History can be found for files that do not exist anymore.
+	revs, err := history.Revisions(hyphaName)
+	if err == nil {
+		for _, rev := range revs {
+			tbody += rev.AsHtmlTableRow(hyphaName)
 		}
-		log.Println(revs)
 	}
+	log.Println("Found", len(revs), "revisions for", hyphaName)

 	util.HTTP200Page(w,
 		base(hyphaName, templates.HistoryHTML(hyphaName, tbody)))
--- a/hypha.go
+++ b/hypha.go
@ -7,8 +7,11 @@ import (
 	"log"
 	"os"
 	"path/filepath"
+	"strings"

 	"github.com/bouncepaw/mycorrhiza/gemtext"
+	"github.com/bouncepaw/mycorrhiza/history"
+	"github.com/bouncepaw/mycorrhiza/util"
 )

 func init() {
@ -37,6 +40,78 @@ type HyphaData struct {
 	binaryType BinaryType
 }

+// DeleteHypha deletes hypha and makes a history record about that.
+func (hd *HyphaData) DeleteHypha(hyphaName string) *history.HistoryOp {
+	hop := history.Operation(history.TypeDeleteHypha).
+		WithFilesRemoved(hd.textPath, hd.binaryPath).
+		WithMsg(fmt.Sprintf("Delete ‘%s’", hyphaName)).
+		WithSignature("anon").
+		Apply()
+	if len(hop.Errs) == 0 {
+		delete(HyphaStorage, hyphaName)
+	}
+	return hop
+}
+
+func findHyphaeToRename(hyphaName string, recursive bool) []string {
+	hyphae := []string{hyphaName}
+	if recursive {
+		hyphae = append(hyphae, util.FindSubhyphae(hyphaName, IterateHyphaNamesWith)...)
+	}
+	return hyphae
+}
+
+func renamingPairs(hyphaNames []string, replaceName func(string) string) map[string]string {
+	renameMap := make(map[string]string)
+	for _, hn := range hyphaNames {
+		if hd, ok := HyphaStorage[hn]; ok {
+			if hd.textPath != "" {
+				renameMap[hd.textPath] = replaceName(hd.textPath)
+			}
+			if hd.binaryPath != "" {
+				renameMap[hd.binaryPath] = replaceName(hd.binaryPath)
+			}
+		}
+	}
+	return renameMap
+}
+
+// word Data is plural here
+func relocateHyphaData(hyphaNames []string, replaceName func(string) string) {
+	for _, hyphaName := range hyphaNames {
+		if hd, ok := HyphaStorage[hyphaName]; ok {
+			hd.textPath = replaceName(hd.textPath)
+			hd.binaryPath = replaceName(hd.binaryPath)
+			HyphaStorage[replaceName(hyphaName)] = hd
+			delete(HyphaStorage, hyphaName)
+		}
+	}
+}
+
+// RenameHypha renames hypha from old name `hyphaName` to `newName` and makes a history record about that. If `recursive` is `true`, its subhyphae will be renamed the same way.
+func (hd *HyphaData) RenameHypha(hyphaName, newName string, recursive bool) *history.HistoryOp {
+	var (
+		replaceName = func(str string) string {
+			return strings.Replace(str, hyphaName, newName, 1)
+		}
+		hyphaNames = findHyphaeToRename(hyphaName, recursive)
+		renameMap  = renamingPairs(hyphaNames, replaceName)
+		renameMsg  = "Rename ‘%s’ to ‘%s’"
+		hop        = history.Operation(history.TypeRenameHypha)
+	)
+	if recursive {
+		renameMsg += " recursively"
+	}
+	hop.WithFilesRenamed(renameMap).
+		WithMsg(fmt.Sprintf(renameMsg, hyphaName, newName)).
+		WithSignature("anon").
+		Apply()
+	if len(hop.Errs) == 0 {
+		relocateHyphaData(hyphaNames, replaceName)
+	}
+	return hop
+}
+
 // binaryHtmlBlock creates an html block for binary part of the hypha.
 func binaryHtmlBlock(hyphaName string, d *HyphaData) string {
 	switch d.binaryType {
--- a/main.go
+++ b/main.go
@ -10,6 +10,8 @@ import (
 	"os"
 	"path/filepath"
 	"regexp"
+	"strconv"
+	"strings"

 	"github.com/bouncepaw/mycorrhiza/history"
 	"github.com/bouncepaw/mycorrhiza/templates"
@ -19,7 +21,7 @@ import (
 // WikiDir is a rooted path to the wiki storage directory.
 var WikiDir string

-// HyphaPattern is a pattern which all hyphae must match. Not used currently.
+// HyphaPattern is a pattern which all hyphae must match.
 var HyphaPattern = regexp.MustCompile(`[^?!:#@><*|"\'&%]+`)

 // HyphaStorage is a mapping between canonical hypha names and their meta information.
@ -83,6 +85,20 @@ func handlerRandom(w http.ResponseWriter, rq *http.Request) {
 	http.Redirect(w, rq, "/page/"+randomHyphaName, http.StatusSeeOther)
 }

+// Recent changes
+func handlerRecentChanges(w http.ResponseWriter, rq *http.Request) {
+	log.Println(rq.URL)
+	var (
+		noPrefix = strings.TrimPrefix(rq.URL.String(), "/recent-changes/")
+		n, err   = strconv.Atoi(noPrefix)
+	)
+	if err == nil {
+		util.HTTP200Page(w, base(strconv.Itoa(n)+" recent changes", history.RecentChanges(n)))
+	} else {
+		http.Redirect(w, rq, "/recent-changes/20", http.StatusSeeOther)
+	}
+}
+
 func main() {
 	log.Println("Running MycorrhizaWiki β")

@ -104,10 +120,11 @@ func main() {

 	http.Handle("/static/", http.StripPrefix("/static/", http.FileServer(http.Dir(WikiDir+"/static"))))
 	// See http_readers.go for /page/, /text/, /binary/, /history/.
-	// See http_mutators.go for /upload-binary/, /upload-text/, /edit/.
+	// See http_mutators.go for /upload-binary/, /upload-text/, /edit/, /delete-ask/, /delete-confirm/, /rename-ask/, /rename-confirm/.
 	http.HandleFunc("/list", handlerList)
 	http.HandleFunc("/reindex", handlerReindex)
 	http.HandleFunc("/random", handlerRandom)
+	http.HandleFunc("/recent-changes/", handlerRecentChanges)
 	http.HandleFunc("/favicon.ico", func(w http.ResponseWriter, rq *http.Request) {
 		http.ServeFile(w, rq, WikiDir+"/static/favicon.ico")
 	})
--- a/2
+++ b/2
@ -1 +1 @@
-Subproject commit bdaaab62574023487610d608d1e9f2f351707a7f
+Subproject commit 2c0e43199ed28f7022a38463a0eec3af3ecb03c9
--- a/templates/common.qtpl
+++ b/templates/common.qtpl
@ -0,0 +1,32 @@
+This is the <nav> seen on top of many pages.
+{% code
+type navEntry struct {
+	path string
+	title string
+}
+var navEntries = []navEntry{
+	{"page", "Hypha"},
+	{"edit", "Edit"},
+	{"text", "Raw text"},
+	{"history", "History"},
+	{"revision", "NOT REACHED"},
+	{"delete-ask", "Delete"},
+	{"rename-ask", "Rename"},
+}
+%}
+
+{% func navHTML(hyphaName, navType string, revisionHash ...string) %}
+	<nav>
+		<ul>
+		{%- for _, entry := range navEntries -%}
+		{%- if navType == "revision" && entry.path == "revision" -%}
+			<li><b>{%s revisionHash[0] %}</b></li>
+		{%- elseif navType == entry.path -%}
+			<li><b>{%s entry.title %}</b></li>
+		{%- elseif entry.path != "revision"-%}
+			<li><a href="/{%s entry.path %}/{%s hyphaName %}">{%s entry.title %}</a></li>
+		{%- endif -%}
+		{%- endfor -%}
+		</ul>
+	</nav>
+{% endfunc %}
--- a/templates/common.qtpl.go
+++ b/templates/common.qtpl.go
@ -0,0 +1,117 @@
+// Code generated by qtc from "common.qtpl". DO NOT EDIT.
+// See https://github.com/valyala/quicktemplate for details.
+
+// This is the <nav> seen on top of many pages.
+
+//line templates/common.qtpl:2
+package templates
+
+//line templates/common.qtpl:2
+import (
+	qtio422016 "io"
+
+	qt422016 "github.com/valyala/quicktemplate"
+)
+
+//line templates/common.qtpl:2
+var (
+	_ = qtio422016.Copy
+	_ = qt422016.AcquireByteBuffer
+)
+
+//line templates/common.qtpl:3
+type navEntry struct {
+	path  string
+	title string
+}
+
+var navEntries = []navEntry{
+	{"page", "Hypha"},
+	{"edit", "Edit"},
+	{"text", "Raw text"},
+	{"history", "History"},
+	{"revision", "NOT REACHED"},
+	{"delete-ask", "Delete"},
+	{"rename-ask", "Rename"},
+}
+
+//line templates/common.qtpl:18
+func streamnavHTML(qw422016 *qt422016.Writer, hyphaName, navType string, revisionHash ...string) {
+//line templates/common.qtpl:18
+	qw422016.N().S(`
+	<nav>
+		<ul>
+`)
+//line templates/common.qtpl:21
+	for _, entry := range navEntries {
+//line templates/common.qtpl:22
+		if navType == "revision" && entry.path == "revision" {
+//line templates/common.qtpl:22
+			qw422016.N().S(`			<li><b>`)
+//line templates/common.qtpl:23
+			qw422016.E().S(revisionHash[0])
+//line templates/common.qtpl:23
+			qw422016.N().S(`</b></li>
+`)
+//line templates/common.qtpl:24
+		} else if navType == entry.path {
+//line templates/common.qtpl:24
+			qw422016.N().S(`			<li><b>`)
+//line templates/common.qtpl:25
+			qw422016.E().S(entry.title)
+//line templates/common.qtpl:25
+			qw422016.N().S(`</b></li>
+`)
+//line templates/common.qtpl:26
+		} else if entry.path != "revision" {
+//line templates/common.qtpl:26
+			qw422016.N().S(`			<li><a href="/`)
+//line templates/common.qtpl:27
+			qw422016.E().S(entry.path)
+//line templates/common.qtpl:27
+			qw422016.N().S(`/`)
+//line templates/common.qtpl:27
+			qw422016.E().S(hyphaName)
+//line templates/common.qtpl:27
+			qw422016.N().S(`">`)
+//line templates/common.qtpl:27
+			qw422016.E().S(entry.title)
+//line templates/common.qtpl:27
+			qw422016.N().S(`</a></li>
+`)
+//line templates/common.qtpl:28
+		}
+//line templates/common.qtpl:29
+	}
+//line templates/common.qtpl:29
+	qw422016.N().S(`		</ul>
+	</nav>
+`)
+//line templates/common.qtpl:32
+}
+
+//line templates/common.qtpl:32
+func writenavHTML(qq422016 qtio422016.Writer, hyphaName, navType string, revisionHash ...string) {
+//line templates/common.qtpl:32
+	qw422016 := qt422016.AcquireWriter(qq422016)
+//line templates/common.qtpl:32
+	streamnavHTML(qw422016, hyphaName, navType, revisionHash...)
+//line templates/common.qtpl:32
+	qt422016.ReleaseWriter(qw422016)
+//line templates/common.qtpl:32
+}
+
+//line templates/common.qtpl:32
+func navHTML(hyphaName, navType string, revisionHash ...string) string {
+//line templates/common.qtpl:32
+	qb422016 := qt422016.AcquireByteBuffer()
+//line templates/common.qtpl:32
+	writenavHTML(qb422016, hyphaName, navType, revisionHash...)
+//line templates/common.qtpl:32
+	qs422016 := string(qb422016.B)
+//line templates/common.qtpl:32
+	qt422016.ReleaseByteBuffer(qb422016)
+//line templates/common.qtpl:32
+	return qs422016
+//line templates/common.qtpl:32
+}
--- a/templates/http_delete.qtpl
+++ b/templates/http_delete.qtpl
@ -0,0 +1,25 @@
+This dialog is to be shown to a user when they try to delete a hypha.
+{% func DeleteAskHTML(hyphaName string, isOld bool) %}
+<main>
+{%= navHTML(hyphaName, "delete-ask") %}
+{% if isOld %}
+	<section>
+		<h1>Delete {%s hyphaName %}?</h1>
+		<p>Do you really want to delete hypha <em>{%s hyphaName %}</em>?</p>
+		<p>In this version of MycorrhizaWiki you cannot undelete a deleted hypha but the history can still be accessed.</p>
+		<p><a href="/delete-confirm/{%s hyphaName %}"><strong>Confirm</strong></a></p>
+		<p><a href="/page/{%s hyphaName %}">Cancel</a></p>
+	</section>
+{% else %}
+	{%= cannotDeleteDueToNonExistence(hyphaName) %}
+{% endif %}
+</main>
+{% endfunc %}
+
+{% func cannotDeleteDueToNonExistence(hyphaName string) %}
+	<section>
+		<h1>Cannot delete {%s hyphaName %}</h1>
+		<p>This hypha does not exist.</p>
+		<p><a href="/page/{%s hyphaName %}">Go back</a></p>
+	</section>
+{% endfunc %}
--- a/templates/http_delete.qtpl.go
+++ b/templates/http_delete.qtpl.go
@ -0,0 +1,151 @@
+// Code generated by qtc from "http_delete.qtpl". DO NOT EDIT.
+// See https://github.com/valyala/quicktemplate for details.
+
+// This dialog is to be shown to a user when they try to delete a hypha.
+
+//line templates/http_delete.qtpl:2
+package templates
+
+//line templates/http_delete.qtpl:2
+import (
+	qtio422016 "io"
+
+	qt422016 "github.com/valyala/quicktemplate"
+)
+
+//line templates/http_delete.qtpl:2
+var (
+	_ = qtio422016.Copy
+	_ = qt422016.AcquireByteBuffer
+)
+
+//line templates/http_delete.qtpl:2
+func StreamDeleteAskHTML(qw422016 *qt422016.Writer, hyphaName string, isOld bool) {
+//line templates/http_delete.qtpl:2
+	qw422016.N().S(`
+<main>
+`)
+//line templates/http_delete.qtpl:4
+	streamnavHTML(qw422016, hyphaName, "delete-ask")
+//line templates/http_delete.qtpl:4
+	qw422016.N().S(`
+`)
+//line templates/http_delete.qtpl:5
+	if isOld {
+//line templates/http_delete.qtpl:5
+		qw422016.N().S(`
+	<section>
+		<h1>Delete `)
+//line templates/http_delete.qtpl:7
+		qw422016.E().S(hyphaName)
+//line templates/http_delete.qtpl:7
+		qw422016.N().S(`?</h1>
+		<p>Do you really want to delete hypha <em>`)
+//line templates/http_delete.qtpl:8
+		qw422016.E().S(hyphaName)
+//line templates/http_delete.qtpl:8
+		qw422016.N().S(`</em>?</p>
+		<p>In this version of MycorrhizaWiki you cannot undelete a deleted hypha but the history can still be accessed.</p>
+		<p><a href="/delete-confirm/`)
+//line templates/http_delete.qtpl:10
+		qw422016.E().S(hyphaName)
+//line templates/http_delete.qtpl:10
+		qw422016.N().S(`"><strong>Confirm</strong></a></p>
+		<p><a href="/page/`)
+//line templates/http_delete.qtpl:11
+		qw422016.E().S(hyphaName)
+//line templates/http_delete.qtpl:11
+		qw422016.N().S(`">Cancel</a></p>
+	</section>
+`)
+//line templates/http_delete.qtpl:13
+	} else {
+//line templates/http_delete.qtpl:13
+		qw422016.N().S(`
+	`)
+//line templates/http_delete.qtpl:14
+		streamcannotDeleteDueToNonExistence(qw422016, hyphaName)
+//line templates/http_delete.qtpl:14
+		qw422016.N().S(`
+`)
+//line templates/http_delete.qtpl:15
+	}
+//line templates/http_delete.qtpl:15
+	qw422016.N().S(`
+</main>
+`)
+//line templates/http_delete.qtpl:17
+}
+
+//line templates/http_delete.qtpl:17
+func WriteDeleteAskHTML(qq422016 qtio422016.Writer, hyphaName string, isOld bool) {
+//line templates/http_delete.qtpl:17
+	qw422016 := qt422016.AcquireWriter(qq422016)
+//line templates/http_delete.qtpl:17
+	StreamDeleteAskHTML(qw422016, hyphaName, isOld)
+//line templates/http_delete.qtpl:17
+	qt422016.ReleaseWriter(qw422016)
+//line templates/http_delete.qtpl:17
+}
+
+//line templates/http_delete.qtpl:17
+func DeleteAskHTML(hyphaName string, isOld bool) string {
+//line templates/http_delete.qtpl:17
+	qb422016 := qt422016.AcquireByteBuffer()
+//line templates/http_delete.qtpl:17
+	WriteDeleteAskHTML(qb422016, hyphaName, isOld)
+//line templates/http_delete.qtpl:17
+	qs422016 := string(qb422016.B)
+//line templates/http_delete.qtpl:17
+	qt422016.ReleaseByteBuffer(qb422016)
+//line templates/http_delete.qtpl:17
+	return qs422016
+//line templates/http_delete.qtpl:17
+}
+
+//line templates/http_delete.qtpl:19
+func streamcannotDeleteDueToNonExistence(qw422016 *qt422016.Writer, hyphaName string) {
+//line templates/http_delete.qtpl:19
+	qw422016.N().S(`
+	<section>
+		<h1>Cannot delete `)
+//line templates/http_delete.qtpl:21
+	qw422016.E().S(hyphaName)
+//line templates/http_delete.qtpl:21
+	qw422016.N().S(`</h1>
+		<p>This hypha does not exist.</p>
+		<p><a href="/page/`)
+//line templates/http_delete.qtpl:23
+	qw422016.E().S(hyphaName)
+//line templates/http_delete.qtpl:23
+	qw422016.N().S(`">Go back</a></p>
+	</section>
+`)
+//line templates/http_delete.qtpl:25
+}
+
+//line templates/http_delete.qtpl:25
+func writecannotDeleteDueToNonExistence(qq422016 qtio422016.Writer, hyphaName string) {
+//line templates/http_delete.qtpl:25
+	qw422016 := qt422016.AcquireWriter(qq422016)
+//line templates/http_delete.qtpl:25
+	streamcannotDeleteDueToNonExistence(qw422016, hyphaName)
+//line templates/http_delete.qtpl:25
+	qt422016.ReleaseWriter(qw422016)
+//line templates/http_delete.qtpl:25
+}
+
+//line templates/http_delete.qtpl:25
+func cannotDeleteDueToNonExistence(hyphaName string) string {
+//line templates/http_delete.qtpl:25
+	qb422016 := qt422016.AcquireByteBuffer()
+//line templates/http_delete.qtpl:25
+	writecannotDeleteDueToNonExistence(qb422016, hyphaName)
+//line templates/http_delete.qtpl:25
+	qs422016 := string(qb422016.B)
+//line templates/http_delete.qtpl:25
+	qt422016.ReleaseByteBuffer(qb422016)
+//line templates/http_delete.qtpl:25
+	return qs422016
+//line templates/http_delete.qtpl:25
+}
--- a/templates/http_mutators.qtpl
+++ b/templates/http_mutators.qtpl
@ -1,4 +1,3 @@
-
 {% func EditHTML(hyphaName, textAreaFill, warning string) %}
 		<main>
 			<h1>Edit {%s hyphaName %}</h1>
--- a/templates/http_mutators.qtpl.go
+++ b/templates/http_mutators.qtpl.go
@ -1,83 +1,83 @@
 // Code generated by qtc from "http_mutators.qtpl". DO NOT EDIT.
 // See https://github.com/valyala/quicktemplate for details.

-//line templates/http_mutators.qtpl:2
+//line templates/http_mutators.qtpl:1
 package templates

-//line templates/http_mutators.qtpl:2
+//line templates/http_mutators.qtpl:1
 import (
 	qtio422016 "io"

 	qt422016 "github.com/valyala/quicktemplate"
 )

-//line templates/http_mutators.qtpl:2
+//line templates/http_mutators.qtpl:1
 var (
 	_ = qtio422016.Copy
 	_ = qt422016.AcquireByteBuffer
 )

-//line templates/http_mutators.qtpl:2
+//line templates/http_mutators.qtpl:1
 func StreamEditHTML(qw422016 *qt422016.Writer, hyphaName, textAreaFill, warning string) {
-//line templates/http_mutators.qtpl:2
+//line templates/http_mutators.qtpl:1
 	qw422016.N().S(`
 		<main>
 			<h1>Edit `)
-//line templates/http_mutators.qtpl:4
+//line templates/http_mutators.qtpl:3
 	qw422016.E().S(hyphaName)
-//line templates/http_mutators.qtpl:4
+//line templates/http_mutators.qtpl:3
 	qw422016.N().S(`</h1>
 			`)
-//line templates/http_mutators.qtpl:5
+//line templates/http_mutators.qtpl:4
 	qw422016.N().S(warning)
-//line templates/http_mutators.qtpl:5
+//line templates/http_mutators.qtpl:4
 	qw422016.N().S(`
 			<form method="post" class="upload-text-form"
 			      action="/upload-text/`)
-//line templates/http_mutators.qtpl:7
+//line templates/http_mutators.qtpl:6
 	qw422016.E().S(hyphaName)
-//line templates/http_mutators.qtpl:7
+//line templates/http_mutators.qtpl:6
 	qw422016.N().S(`">
 				<textarea name="text">`)
-//line templates/http_mutators.qtpl:8
+//line templates/http_mutators.qtpl:7
 	qw422016.E().S(textAreaFill)
-//line templates/http_mutators.qtpl:8
+//line templates/http_mutators.qtpl:7
 	qw422016.N().S(`</textarea>
 				<br/>
 				<input type="submit"/>
 				<a href="/page/`)
-//line templates/http_mutators.qtpl:11
+//line templates/http_mutators.qtpl:10
 	qw422016.E().S(hyphaName)
-//line templates/http_mutators.qtpl:11
+//line templates/http_mutators.qtpl:10
 	qw422016.N().S(`">Cancel</a>
 			</form>
 		</main>
 `)
-//line templates/http_mutators.qtpl:14
+//line templates/http_mutators.qtpl:13
 }

-//line templates/http_mutators.qtpl:14
+//line templates/http_mutators.qtpl:13
 func WriteEditHTML(qq422016 qtio422016.Writer, hyphaName, textAreaFill, warning string) {
-//line templates/http_mutators.qtpl:14
+//line templates/http_mutators.qtpl:13
 	qw422016 := qt422016.AcquireWriter(qq422016)
-//line templates/http_mutators.qtpl:14
+//line templates/http_mutators.qtpl:13
 	StreamEditHTML(qw422016, hyphaName, textAreaFill, warning)
-//line templates/http_mutators.qtpl:14
+//line templates/http_mutators.qtpl:13
 	qt422016.ReleaseWriter(qw422016)
-//line templates/http_mutators.qtpl:14
+//line templates/http_mutators.qtpl:13
 }

-//line templates/http_mutators.qtpl:14
+//line templates/http_mutators.qtpl:13
 func EditHTML(hyphaName, textAreaFill, warning string) string {
-//line templates/http_mutators.qtpl:14
+//line templates/http_mutators.qtpl:13
 	qb422016 := qt422016.AcquireByteBuffer()
-//line templates/http_mutators.qtpl:14
+//line templates/http_mutators.qtpl:13
 	WriteEditHTML(qb422016, hyphaName, textAreaFill, warning)
-//line templates/http_mutators.qtpl:14
+//line templates/http_mutators.qtpl:13
 	qs422016 := string(qb422016.B)
-//line templates/http_mutators.qtpl:14
+//line templates/http_mutators.qtpl:13
 	qt422016.ReleaseByteBuffer(qb422016)
-//line templates/http_mutators.qtpl:14
+//line templates/http_mutators.qtpl:13
 	return qs422016
-//line templates/http_mutators.qtpl:14
+//line templates/http_mutators.qtpl:13
 }
--- a/templates/http_readers.qtpl
+++ b/templates/http_readers.qtpl
@ -1,81 +1,59 @@
 {% func HistoryHTML(hyphaName, tbody string) %}
-		<main>
-			<nav>
-				<ul>
-					<li><a href="/page/{%s hyphaName %}">Hypha</a></li>
-					<li><a href="/edit/{%s hyphaName %}">Edit</a></li>
-					<li><a href="/text/{%s hyphaName %}">Raw text</a></li>
-					<li><b>History</b></li>
-				</ul>
-			</nav>
-			<table>
-				<thead>
-					<tr>
-						<th>Time</th>
-						<th>Hash</th>
-						<th>Message</th>
-					</tr>
-				</thead>
-				<tbody>
-				{%s= tbody %}
-				</tbody>
-			</table>
-		</main>
+<main>
+{%= navHTML(hyphaName, "history") %}
+	<table>
+		<thead>
+			<tr>
+				<th>Time</th>
+				<th>Hash</th>
+				<th>Message</th>
+			</tr>
+		</thead>
+		<tbody>
+		{%s= tbody %}
+		</tbody>
+	</table>
+</main>
 {% endfunc %}

 {% func RevisionHTML(hyphaName, naviTitle, contents, tree, revHash string) %}
-		<main>
-			<nav>
-				<ul>
-					<li><a href="/page/{%s hyphaName %}">Hypha</a></li>
-					<li><a href="/edit/{%s hyphaName %}">Edit</a></li>
-					<li><a href="/text/{%s hyphaName %}">Raw text</a></li>
-					<li><a href="/history/{%s hyphaName %}">History</a></li>
-					<li><b>{%s revHash %}</b></li>
-				</ul>
-			</nav>
-			<article>
-				<p>Please note that viewing binary parts of hyphae is not supported in history for now.</p>
-				{%s= naviTitle %}
-				{%s= contents %}
-			</article>
-			<hr/>
-			<aside>
-				{%s= tree %}
-			</aside>
-		</main>
+<main>
+{%= navHTML(hyphaName, "revision", revHash) %}
+	<article>
+		<p>Please note that viewing binary parts of hyphae is not supported in history for now.</p>
+		{%s= naviTitle %}
+		{%s= contents %}
+	</article>
+	<hr/>
+	<aside>
+		{%s= tree %}
+	</aside>
+</main>
 {% endfunc %}

 If `contents` == "", a helpful message is shown instead.
 {% func PageHTML(hyphaName, naviTitle, contents, tree string) %}
-		<main>
-			<nav>
-				<ul>
-					<li><b>Hypha</b></li>
-					<li><a href="/edit/{%s hyphaName %}">Edit</a></li>
-					<li><a href="/text/{%s hyphaName %}">Raw text</a></li>
-					<li><a href="/history/{%s hyphaName %}">History</a></li>
-				</ul>
-			</nav>
-			<article>
-				{%s= naviTitle %}
-				{% if contents == "" %}
-					<p>This hypha has no text. Why not <a href="/edit/{%s hyphaName %}">create it</a>?</p>
-				{% else %}
-					{%s= contents %}
-				{% endif %}
-			</article>
-			<hr/>
-			<form action="/upload-binary/{%s hyphaName %}"
-			      method="post" enctype="multipart/form-data">
-				<label for="upload-binary__input">Upload new binary part</label>
-				<br>
-				<input type="file" id="upload-binary__input" name="binary"/>
-				<input type="submit"/>
-			</form>
-			<hr/>
-			<aside>
-				{%s= tree %}
-			</aside>
-		</main>
+<main>
+{%= navHTML(hyphaName, "page") %}
+	<article>
+		{%s= naviTitle %}
+		{% if contents == "" %}
+			<p>This hypha has no text. Why not <a href="/edit/{%s hyphaName %}">create it</a>?</p>
+		{% else %}
+			{%s= contents %}
+		{% endif %}
+	</article>
+	<hr/>
+	<form action="/upload-binary/{%s hyphaName %}"
+			method="post" enctype="multipart/form-data">
+		<label for="upload-binary__input">Upload new binary part</label>
+		<br>
+		<input type="file" id="upload-binary__input" name="binary"/>
+		<input type="submit"/>
+	</form>
+	<hr/>
+	<aside>
+		{%s= tree %}
+	</aside>
+</main>
 {% endfunc %}
--- a/templates/http_readers.qtpl.go
+++ b/templates/http_readers.qtpl.go
@ -21,266 +21,212 @@ var (
 func StreamHistoryHTML(qw422016 *qt422016.Writer, hyphaName, tbody string) {
 //line templates/http_readers.qtpl:1
 	qw422016.N().S(`
-		<main>
-			<nav>
-				<ul>
-					<li><a href="/page/`)
-//line templates/http_readers.qtpl:5
-	qw422016.E().S(hyphaName)
-//line templates/http_readers.qtpl:5
-	qw422016.N().S(`">Hypha</a></li>
-					<li><a href="/edit/`)
-//line templates/http_readers.qtpl:6
-	qw422016.E().S(hyphaName)
-//line templates/http_readers.qtpl:6
-	qw422016.N().S(`">Edit</a></li>
-					<li><a href="/text/`)
-//line templates/http_readers.qtpl:7
-	qw422016.E().S(hyphaName)
-//line templates/http_readers.qtpl:7
-	qw422016.N().S(`">Raw text</a></li>
-					<li><b>History</b></li>
-				</ul>
-			</nav>
-			<table>
-				<thead>
-					<tr>
-						<th>Time</th>
-						<th>Hash</th>
-						<th>Message</th>
-					</tr>
-				</thead>
-				<tbody>
-				`)
-//line templates/http_readers.qtpl:20
+<main>
+`)
+//line templates/http_readers.qtpl:3
+	streamnavHTML(qw422016, hyphaName, "history")
+//line templates/http_readers.qtpl:3
+	qw422016.N().S(`
+	<table>
+		<thead>
+			<tr>
+				<th>Time</th>
+				<th>Hash</th>
+				<th>Message</th>
+			</tr>
+		</thead>
+		<tbody>
+		`)
+//line templates/http_readers.qtpl:13
 	qw422016.N().S(tbody)
-//line templates/http_readers.qtpl:20
+//line templates/http_readers.qtpl:13
 	qw422016.N().S(`
-				</tbody>
-			</table>
-		</main>
+		</tbody>
+	</table>
+</main>
 `)
-//line templates/http_readers.qtpl:24
+//line templates/http_readers.qtpl:17
 }

-//line templates/http_readers.qtpl:24
+//line templates/http_readers.qtpl:17
 func WriteHistoryHTML(qq422016 qtio422016.Writer, hyphaName, tbody string) {
-//line templates/http_readers.qtpl:24
+//line templates/http_readers.qtpl:17
 	qw422016 := qt422016.AcquireWriter(qq422016)
-//line templates/http_readers.qtpl:24
+//line templates/http_readers.qtpl:17
 	StreamHistoryHTML(qw422016, hyphaName, tbody)
-//line templates/http_readers.qtpl:24
+//line templates/http_readers.qtpl:17
 	qt422016.ReleaseWriter(qw422016)
-//line templates/http_readers.qtpl:24
+//line templates/http_readers.qtpl:17
 }

-//line templates/http_readers.qtpl:24
+//line templates/http_readers.qtpl:17
 func HistoryHTML(hyphaName, tbody string) string {
-//line templates/http_readers.qtpl:24
+//line templates/http_readers.qtpl:17
 	qb422016 := qt422016.AcquireByteBuffer()
-//line templates/http_readers.qtpl:24
+//line templates/http_readers.qtpl:17
 	WriteHistoryHTML(qb422016, hyphaName, tbody)
-//line templates/http_readers.qtpl:24
+//line templates/http_readers.qtpl:17
 	qs422016 := string(qb422016.B)
-//line templates/http_readers.qtpl:24
+//line templates/http_readers.qtpl:17
 	qt422016.ReleaseByteBuffer(qb422016)
-//line templates/http_readers.qtpl:24
+//line templates/http_readers.qtpl:17
 	return qs422016
-//line templates/http_readers.qtpl:24
+//line templates/http_readers.qtpl:17
 }

-//line templates/http_readers.qtpl:26
+//line templates/http_readers.qtpl:19
 func StreamRevisionHTML(qw422016 *qt422016.Writer, hyphaName, naviTitle, contents, tree, revHash string) {
-//line templates/http_readers.qtpl:26
+//line templates/http_readers.qtpl:19
 	qw422016.N().S(`
-		<main>
-			<nav>
-				<ul>
-					<li><a href="/page/`)
-//line templates/http_readers.qtpl:30
-	qw422016.E().S(hyphaName)
-//line templates/http_readers.qtpl:30
-	qw422016.N().S(`">Hypha</a></li>
-					<li><a href="/edit/`)
-//line templates/http_readers.qtpl:31
-	qw422016.E().S(hyphaName)
-//line templates/http_readers.qtpl:31
-	qw422016.N().S(`">Edit</a></li>
-					<li><a href="/text/`)
-//line templates/http_readers.qtpl:32
-	qw422016.E().S(hyphaName)
-//line templates/http_readers.qtpl:32
-	qw422016.N().S(`">Raw text</a></li>
-					<li><a href="/history/`)
-//line templates/http_readers.qtpl:33
-	qw422016.E().S(hyphaName)
-//line templates/http_readers.qtpl:33
-	qw422016.N().S(`">History</a></li>
-					<li><b>`)
-//line templates/http_readers.qtpl:34
-	qw422016.E().S(revHash)
-//line templates/http_readers.qtpl:34
-	qw422016.N().S(`</b></li>
-				</ul>
-			</nav>
-			<article>
-				<p>Please note that viewing binary parts of hyphae is not supported in history for now.</p>
-				`)
-//line templates/http_readers.qtpl:39
-	qw422016.N().S(naviTitle)
-//line templates/http_readers.qtpl:39
-	qw422016.N().S(`
-				`)
-//line templates/http_readers.qtpl:40
-	qw422016.N().S(contents)
-//line templates/http_readers.qtpl:40
-	qw422016.N().S(`
-			</article>
-			<hr/>
-			<aside>
-				`)
-//line templates/http_readers.qtpl:44
-	qw422016.N().S(tree)
-//line templates/http_readers.qtpl:44
-	qw422016.N().S(`
-			</aside>
-		</main>
+<main>
 `)
-//line templates/http_readers.qtpl:47
+//line templates/http_readers.qtpl:21
+	streamnavHTML(qw422016, hyphaName, "revision", revHash)
+//line templates/http_readers.qtpl:21
+	qw422016.N().S(`
+	<article>
+		<p>Please note that viewing binary parts of hyphae is not supported in history for now.</p>
+		`)
+//line templates/http_readers.qtpl:24
+	qw422016.N().S(naviTitle)
+//line templates/http_readers.qtpl:24
+	qw422016.N().S(`
+		`)
+//line templates/http_readers.qtpl:25
+	qw422016.N().S(contents)
+//line templates/http_readers.qtpl:25
+	qw422016.N().S(`
+	</article>
+	<hr/>
+	<aside>
+		`)
+//line templates/http_readers.qtpl:29
+	qw422016.N().S(tree)
+//line templates/http_readers.qtpl:29
+	qw422016.N().S(`
+	</aside>
+</main>
+`)
+//line templates/http_readers.qtpl:32
 }

-//line templates/http_readers.qtpl:47
+//line templates/http_readers.qtpl:32
 func WriteRevisionHTML(qq422016 qtio422016.Writer, hyphaName, naviTitle, contents, tree, revHash string) {
-//line templates/http_readers.qtpl:47
+//line templates/http_readers.qtpl:32
 	qw422016 := qt422016.AcquireWriter(qq422016)
-//line templates/http_readers.qtpl:47
+//line templates/http_readers.qtpl:32
 	StreamRevisionHTML(qw422016, hyphaName, naviTitle, contents, tree, revHash)
-//line templates/http_readers.qtpl:47
+//line templates/http_readers.qtpl:32
 	qt422016.ReleaseWriter(qw422016)
-//line templates/http_readers.qtpl:47
+//line templates/http_readers.qtpl:32
 }

-//line templates/http_readers.qtpl:47
+//line templates/http_readers.qtpl:32
 func RevisionHTML(hyphaName, naviTitle, contents, tree, revHash string) string {
-//line templates/http_readers.qtpl:47
+//line templates/http_readers.qtpl:32
 	qb422016 := qt422016.AcquireByteBuffer()
-//line templates/http_readers.qtpl:47
+//line templates/http_readers.qtpl:32
 	WriteRevisionHTML(qb422016, hyphaName, naviTitle, contents, tree, revHash)
-//line templates/http_readers.qtpl:47
+//line templates/http_readers.qtpl:32
 	qs422016 := string(qb422016.B)
-//line templates/http_readers.qtpl:47
+//line templates/http_readers.qtpl:32
 	qt422016.ReleaseByteBuffer(qb422016)
-//line templates/http_readers.qtpl:47
+//line templates/http_readers.qtpl:32
 	return qs422016
-//line templates/http_readers.qtpl:47
+//line templates/http_readers.qtpl:32
 }

 // If `contents` == "", a helpful message is shown instead.

-//line templates/http_readers.qtpl:50
+//line templates/http_readers.qtpl:35
 func StreamPageHTML(qw422016 *qt422016.Writer, hyphaName, naviTitle, contents, tree string) {
-//line templates/http_readers.qtpl:50
+//line templates/http_readers.qtpl:35
 	qw422016.N().S(`
-		<main>
-			<nav>
-				<ul>
-					<li><b>Hypha</b></li>
-					<li><a href="/edit/`)
-//line templates/http_readers.qtpl:55
-	qw422016.E().S(hyphaName)
-//line templates/http_readers.qtpl:55
-	qw422016.N().S(`">Edit</a></li>
-					<li><a href="/text/`)
-//line templates/http_readers.qtpl:56
-	qw422016.E().S(hyphaName)
-//line templates/http_readers.qtpl:56
-	qw422016.N().S(`">Raw text</a></li>
-					<li><a href="/history/`)
-//line templates/http_readers.qtpl:57
-	qw422016.E().S(hyphaName)
-//line templates/http_readers.qtpl:57
-	qw422016.N().S(`">History</a></li>
-				</ul>
-			</nav>
-			<article>
-				`)
-//line templates/http_readers.qtpl:61
-	qw422016.N().S(naviTitle)
-//line templates/http_readers.qtpl:61
-	qw422016.N().S(`
-				`)
-//line templates/http_readers.qtpl:62
-	if contents == "" {
-//line templates/http_readers.qtpl:62
-		qw422016.N().S(`
-					<p>This hypha has no text. Why not <a href="/edit/`)
-//line templates/http_readers.qtpl:63
-		qw422016.E().S(hyphaName)
-//line templates/http_readers.qtpl:63
-		qw422016.N().S(`">create it</a>?</p>
-				`)
-//line templates/http_readers.qtpl:64
-	} else {
-//line templates/http_readers.qtpl:64
-		qw422016.N().S(`
-					`)
-//line templates/http_readers.qtpl:65
-		qw422016.N().S(contents)
-//line templates/http_readers.qtpl:65
-		qw422016.N().S(`
-				`)
-//line templates/http_readers.qtpl:66
-	}
-//line templates/http_readers.qtpl:66
-	qw422016.N().S(`
-			</article>
-			<hr/>
-			<form action="/upload-binary/`)
-//line templates/http_readers.qtpl:69
-	qw422016.E().S(hyphaName)
-//line templates/http_readers.qtpl:69
-	qw422016.N().S(`"
-			      method="post" enctype="multipart/form-data">
-				<label for="upload-binary__input">Upload new binary part</label>
-				<br>
-				<input type="file" id="upload-binary__input" name="binary"/>
-				<input type="submit"/>
-			</form>
-			<hr/>
-			<aside>
-				`)
-//line templates/http_readers.qtpl:78
-	qw422016.N().S(tree)
-//line templates/http_readers.qtpl:78
-	qw422016.N().S(`
-			</aside>
-		</main>
+<main>
 `)
-//line templates/http_readers.qtpl:81
+//line templates/http_readers.qtpl:37
+	streamnavHTML(qw422016, hyphaName, "page")
+//line templates/http_readers.qtpl:37
+	qw422016.N().S(`
+	<article>
+		`)
+//line templates/http_readers.qtpl:39
+	qw422016.N().S(naviTitle)
+//line templates/http_readers.qtpl:39
+	qw422016.N().S(`
+		`)
+//line templates/http_readers.qtpl:40
+	if contents == "" {
+//line templates/http_readers.qtpl:40
+		qw422016.N().S(`
+			<p>This hypha has no text. Why not <a href="/edit/`)
+//line templates/http_readers.qtpl:41
+		qw422016.E().S(hyphaName)
+//line templates/http_readers.qtpl:41
+		qw422016.N().S(`">create it</a>?</p>
+		`)
+//line templates/http_readers.qtpl:42
+	} else {
+//line templates/http_readers.qtpl:42
+		qw422016.N().S(`
+			`)
+//line templates/http_readers.qtpl:43
+		qw422016.N().S(contents)
+//line templates/http_readers.qtpl:43
+		qw422016.N().S(`
+		`)
+//line templates/http_readers.qtpl:44
+	}
+//line templates/http_readers.qtpl:44
+	qw422016.N().S(`
+	</article>
+	<hr/>
+	<form action="/upload-binary/`)
+//line templates/http_readers.qtpl:47
+	qw422016.E().S(hyphaName)
+//line templates/http_readers.qtpl:47
+	qw422016.N().S(`"
+			method="post" enctype="multipart/form-data">
+		<label for="upload-binary__input">Upload new binary part</label>
+		<br>
+		<input type="file" id="upload-binary__input" name="binary"/>
+		<input type="submit"/>
+	</form>
+	<hr/>
+	<aside>
+		`)
+//line templates/http_readers.qtpl:56
+	qw422016.N().S(tree)
+//line templates/http_readers.qtpl:56
+	qw422016.N().S(`
+	</aside>
+</main>
+`)
+//line templates/http_readers.qtpl:59
 }

-//line templates/http_readers.qtpl:81
+//line templates/http_readers.qtpl:59
 func WritePageHTML(qq422016 qtio422016.Writer, hyphaName, naviTitle, contents, tree string) {
-//line templates/http_readers.qtpl:81
+//line templates/http_readers.qtpl:59
 	qw422016 := qt422016.AcquireWriter(qq422016)
-//line templates/http_readers.qtpl:81
+//line templates/http_readers.qtpl:59
 	StreamPageHTML(qw422016, hyphaName, naviTitle, contents, tree)
-//line templates/http_readers.qtpl:81
+//line templates/http_readers.qtpl:59
 	qt422016.ReleaseWriter(qw422016)
-//line templates/http_readers.qtpl:81
+//line templates/http_readers.qtpl:59
 }

-//line templates/http_readers.qtpl:81
+//line templates/http_readers.qtpl:59
 func PageHTML(hyphaName, naviTitle, contents, tree string) string {
-//line templates/http_readers.qtpl:81
+//line templates/http_readers.qtpl:59
 	qb422016 := qt422016.AcquireByteBuffer()
-//line templates/http_readers.qtpl:81
+//line templates/http_readers.qtpl:59
 	WritePageHTML(qb422016, hyphaName, naviTitle, contents, tree)
-//line templates/http_readers.qtpl:81
+//line templates/http_readers.qtpl:59
 	qs422016 := string(qb422016.B)
-//line templates/http_readers.qtpl:81
+//line templates/http_readers.qtpl:59
 	qt422016.ReleaseByteBuffer(qb422016)
-//line templates/http_readers.qtpl:81
+//line templates/http_readers.qtpl:59
 	return qs422016
-//line templates/http_readers.qtpl:81
+//line templates/http_readers.qtpl:59
 }
--- a/templates/recent_changes.qtpl
+++ b/templates/recent_changes.qtpl
@ -0,0 +1,40 @@
+{% func RecentChangesHTML(changes []string, n int) %}
+<main class="recent-changes">
+	<h1>Recent Changes</h1>
+
+	<nav class="recent-changes__count">
+		See 
+	{% for _, m := range []int{20, 0, 50, 0, 100} %}
+	{% switch m %}
+		{% case 0 %}
+		<span aria-hidden="true">|</span>
+		{% case n %}
+		<b>{%d n %}</b>
+		{% default %}
+		<a href="/recent-changes/{%d m %}">{%d m %}</a>
+	{% endswitch %}
+	{% endfor %}
+		recent changes
+	</nav>
+
+	{% comment %}
+		Here I am, willing to add some accesibility using ARIA. Turns out,
+		role="feed" is not supported in any screen reader as of September
+		2020. At least web search says so. Even JAWS doesn't support it!
+		How come? I'll add the role anyway. -- bouncepaw
+	{% endcomment %}
+
+	<section class="recent-changes__list" role="feed">
+	{% if len(changes) == 0 %}
+		<p>Could not find any recent changes.</p>
+	{% else %}
+		{% for i, entry := range changes %}
+		<ul class="recent-changes__entry" role="article"
+		    aria-setsize="{%d n %}" aria-posinset="{%d i %}">
+			 {%s= entry %}
+		</ul>
+		{% endfor %}
+	{% endif %}
+	</section>
+</main>
+{% endfunc %}
--- a/templates/recent_changes.qtpl.go
+++ b/templates/recent_changes.qtpl.go
@ -0,0 +1,156 @@
+// Code generated by qtc from "recent_changes.qtpl". DO NOT EDIT.
+// See https://github.com/valyala/quicktemplate for details.
+
+//line templates/recent_changes.qtpl:1
+package templates
+
+//line templates/recent_changes.qtpl:1
+import (
+	qtio422016 "io"
+
+	qt422016 "github.com/valyala/quicktemplate"
+)
+
+//line templates/recent_changes.qtpl:1
+var (
+	_ = qtio422016.Copy
+	_ = qt422016.AcquireByteBuffer
+)
+
+//line templates/recent_changes.qtpl:1
+func StreamRecentChangesHTML(qw422016 *qt422016.Writer, changes []string, n int) {
+//line templates/recent_changes.qtpl:1
+	qw422016.N().S(`
+<main class="recent-changes">
+	<h1>Recent Changes</h1>
+
+	<nav class="recent-changes__count">
+		See 
+	`)
+//line templates/recent_changes.qtpl:7
+	for _, m := range []int{20, 0, 50, 0, 100} {
+//line templates/recent_changes.qtpl:7
+		qw422016.N().S(`
+	`)
+//line templates/recent_changes.qtpl:8
+		switch m {
+//line templates/recent_changes.qtpl:9
+		case 0:
+//line templates/recent_changes.qtpl:9
+			qw422016.N().S(`
+		<span aria-hidden="true">|</span>
+		`)
+//line templates/recent_changes.qtpl:11
+		case n:
+//line templates/recent_changes.qtpl:11
+			qw422016.N().S(`
+		<b>`)
+//line templates/recent_changes.qtpl:12
+			qw422016.N().D(n)
+//line templates/recent_changes.qtpl:12
+			qw422016.N().S(`</b>
+		`)
+//line templates/recent_changes.qtpl:13
+		default:
+//line templates/recent_changes.qtpl:13
+			qw422016.N().S(`
+		<a href="/recent-changes/`)
+//line templates/recent_changes.qtpl:14
+			qw422016.N().D(m)
+//line templates/recent_changes.qtpl:14
+			qw422016.N().S(`">`)
+//line templates/recent_changes.qtpl:14
+			qw422016.N().D(m)
+//line templates/recent_changes.qtpl:14
+			qw422016.N().S(`</a>
+	`)
+//line templates/recent_changes.qtpl:15
+		}
+//line templates/recent_changes.qtpl:15
+		qw422016.N().S(`
+	`)
+//line templates/recent_changes.qtpl:16
+	}
+//line templates/recent_changes.qtpl:16
+	qw422016.N().S(`
+		recent changes
+	</nav>
+
+	`)
+//line templates/recent_changes.qtpl:25
+	qw422016.N().S(`
+
+	<section class="recent-changes__list" role="feed">
+	`)
+//line templates/recent_changes.qtpl:28
+	if len(changes) == 0 {
+//line templates/recent_changes.qtpl:28
+		qw422016.N().S(`
+		<p>Could not find any recent changes.</p>
+	`)
+//line templates/recent_changes.qtpl:30
+	} else {
+//line templates/recent_changes.qtpl:30
+		qw422016.N().S(`
+		`)
+//line templates/recent_changes.qtpl:31
+		for i, entry := range changes {
+//line templates/recent_changes.qtpl:31
+			qw422016.N().S(`
+		<ul class="recent-changes__entry" role="article"
+		    aria-setsize="`)
+//line templates/recent_changes.qtpl:33
+			qw422016.N().D(n)
+//line templates/recent_changes.qtpl:33
+			qw422016.N().S(`" aria-posinset="`)
+//line templates/recent_changes.qtpl:33
+			qw422016.N().D(i)
+//line templates/recent_changes.qtpl:33
+			qw422016.N().S(`">
+			 `)
+//line templates/recent_changes.qtpl:34
+			qw422016.N().S(entry)
+//line templates/recent_changes.qtpl:34
+			qw422016.N().S(`
+		</ul>
+		`)
+//line templates/recent_changes.qtpl:36
+		}
+//line templates/recent_changes.qtpl:36
+		qw422016.N().S(`
+	`)
+//line templates/recent_changes.qtpl:37
+	}
+//line templates/recent_changes.qtpl:37
+	qw422016.N().S(`
+	</section>
+</main>
+`)
+//line templates/recent_changes.qtpl:40
+}
+
+//line templates/recent_changes.qtpl:40
+func WriteRecentChangesHTML(qq422016 qtio422016.Writer, changes []string, n int) {
+//line templates/recent_changes.qtpl:40
+	qw422016 := qt422016.AcquireWriter(qq422016)
+//line templates/recent_changes.qtpl:40
+	StreamRecentChangesHTML(qw422016, changes, n)
+//line templates/recent_changes.qtpl:40
+	qt422016.ReleaseWriter(qw422016)
+//line templates/recent_changes.qtpl:40
+}
+
+//line templates/recent_changes.qtpl:40
+func RecentChangesHTML(changes []string, n int) string {
+//line templates/recent_changes.qtpl:40
+	qb422016 := qt422016.AcquireByteBuffer()
+//line templates/recent_changes.qtpl:40
+	WriteRecentChangesHTML(qb422016, changes, n)
+//line templates/recent_changes.qtpl:40
+	qs422016 := string(qb422016.B)
+//line templates/recent_changes.qtpl:40
+	qt422016.ReleaseByteBuffer(qb422016)
+//line templates/recent_changes.qtpl:40
+	return qs422016
+//line templates/recent_changes.qtpl:40
+}
--- a/templates/rename.qtpl
+++ b/templates/rename.qtpl
@ -0,0 +1,36 @@
+This dialog is to be shown to a user when they try to rename a hypha.
+{% func RenameAskHTML(hyphaName string, isOld bool) %}
+<main>
+{%= navHTML(hyphaName, "rename-ask") %}
+{%- if isOld -%}
+	<section>
+		<h1>Rename {%s hyphaName %}</h1>
+		<form action="/rename-confirm/{%s hyphaName %}" method="post" enctype="multipart/form-data">
+			<fieldset>
+				<legend>New name</legend>
+				<input type="text" value="{%s hyphaName %}" required autofocus id="new-name" name="new-name"/>
+			</fieldset>
+
+			<fieldset>
+				<legend>Settings</legend>
+				<input type="checkbox" id="recursive" name="recursive" value="true" checked/>
+				<label for="recursive">Keep subhyphae</label>
+			</fieldset>
+
+			<p>If you rename this hypha, all incoming links and all relative outcoming links will break. You will also lose all history for the new name. Rename carefully.</p>
+			<input type="submit"/>
+		</form>
+	</section>
+{%- else -%}
+	{%= cannotRenameDueToNonExistence(hyphaName) %}
+{%- endif -%}
+</main>
+{% endfunc %}
+
+{% func cannotRenameDueToNonExistence(hyphaName string) %}
+	<section>
+		<h1>Cannot rename {%s hyphaName %}</h1>
+		<p>This hypha does not exist.</p>
+		<p><a href="/page/{%s hyphaName %}">Go back</a></p>
+	</section>
+{% endfunc %}
--- a/templates/rename.qtpl.go
+++ b/templates/rename.qtpl.go
@ -0,0 +1,155 @@
+// Code generated by qtc from "rename.qtpl". DO NOT EDIT.
+// See https://github.com/valyala/quicktemplate for details.
+
+// This dialog is to be shown to a user when they try to rename a hypha.
+
+//line templates/rename.qtpl:2
+package templates
+
+//line templates/rename.qtpl:2
+import (
+	qtio422016 "io"
+
+	qt422016 "github.com/valyala/quicktemplate"
+)
+
+//line templates/rename.qtpl:2
+var (
+	_ = qtio422016.Copy
+	_ = qt422016.AcquireByteBuffer
+)
+
+//line templates/rename.qtpl:2
+func StreamRenameAskHTML(qw422016 *qt422016.Writer, hyphaName string, isOld bool) {
+//line templates/rename.qtpl:2
+	qw422016.N().S(`
+<main>
+`)
+//line templates/rename.qtpl:4
+	streamnavHTML(qw422016, hyphaName, "rename-ask")
+//line templates/rename.qtpl:4
+	qw422016.N().S(`
+`)
+//line templates/rename.qtpl:5
+	if isOld {
+//line templates/rename.qtpl:5
+		qw422016.N().S(`	<section>
+		<h1>Rename `)
+//line templates/rename.qtpl:7
+		qw422016.E().S(hyphaName)
+//line templates/rename.qtpl:7
+		qw422016.N().S(`</h1>
+		<form action="/rename-confirm/`)
+//line templates/rename.qtpl:8
+		qw422016.E().S(hyphaName)
+//line templates/rename.qtpl:8
+		qw422016.N().S(`" method="post" enctype="multipart/form-data">
+			<fieldset>
+				<legend>New name</legend>
+				<input type="text" value="`)
+//line templates/rename.qtpl:11
+		qw422016.E().S(hyphaName)
+//line templates/rename.qtpl:11
+		qw422016.N().S(`" required autofocus id="new-name" name="new-name"/>
+			</fieldset>
+
+			<fieldset>
+				<legend>Settings</legend>
+				<input type="checkbox" id="recursive" name="recursive" value="true" checked/>
+				<label for="recursive">Keep subhyphae</label>
+			</fieldset>
+
+			<p>If you rename this hypha, all incoming links and all relative outcoming links will break. You will also lose all history for the new name. Rename carefully.</p>
+			<input type="submit"/>
+		</form>
+	</section>
+`)
+//line templates/rename.qtpl:24
+	} else {
+//line templates/rename.qtpl:24
+		qw422016.N().S(`	`)
+//line templates/rename.qtpl:25
+		streamcannotRenameDueToNonExistence(qw422016, hyphaName)
+//line templates/rename.qtpl:25
+		qw422016.N().S(`
+`)
+//line templates/rename.qtpl:26
+	}
+//line templates/rename.qtpl:26
+	qw422016.N().S(`</main>
+`)
+//line templates/rename.qtpl:28
+}
+
+//line templates/rename.qtpl:28
+func WriteRenameAskHTML(qq422016 qtio422016.Writer, hyphaName string, isOld bool) {
+//line templates/rename.qtpl:28
+	qw422016 := qt422016.AcquireWriter(qq422016)
+//line templates/rename.qtpl:28
+	StreamRenameAskHTML(qw422016, hyphaName, isOld)
+//line templates/rename.qtpl:28
+	qt422016.ReleaseWriter(qw422016)
+//line templates/rename.qtpl:28
+}
+
+//line templates/rename.qtpl:28
+func RenameAskHTML(hyphaName string, isOld bool) string {
+//line templates/rename.qtpl:28
+	qb422016 := qt422016.AcquireByteBuffer()
+//line templates/rename.qtpl:28
+	WriteRenameAskHTML(qb422016, hyphaName, isOld)
+//line templates/rename.qtpl:28
+	qs422016 := string(qb422016.B)
+//line templates/rename.qtpl:28
+	qt422016.ReleaseByteBuffer(qb422016)
+//line templates/rename.qtpl:28
+	return qs422016
+//line templates/rename.qtpl:28
+}
+
+//line templates/rename.qtpl:30
+func streamcannotRenameDueToNonExistence(qw422016 *qt422016.Writer, hyphaName string) {
+//line templates/rename.qtpl:30
+	qw422016.N().S(`
+	<section>
+		<h1>Cannot rename `)
+//line templates/rename.qtpl:32
+	qw422016.E().S(hyphaName)
+//line templates/rename.qtpl:32
+	qw422016.N().S(`</h1>
+		<p>This hypha does not exist.</p>
+		<p><a href="/page/`)
+//line templates/rename.qtpl:34
+	qw422016.E().S(hyphaName)
+//line templates/rename.qtpl:34
+	qw422016.N().S(`">Go back</a></p>
+	</section>
+`)
+//line templates/rename.qtpl:36
+}
+
+//line templates/rename.qtpl:36
+func writecannotRenameDueToNonExistence(qq422016 qtio422016.Writer, hyphaName string) {
+//line templates/rename.qtpl:36
+	qw422016 := qt422016.AcquireWriter(qq422016)
+//line templates/rename.qtpl:36
+	streamcannotRenameDueToNonExistence(qw422016, hyphaName)
+//line templates/rename.qtpl:36
+	qt422016.ReleaseWriter(qw422016)
+//line templates/rename.qtpl:36
+}
+
+//line templates/rename.qtpl:36
+func cannotRenameDueToNonExistence(hyphaName string) string {
+//line templates/rename.qtpl:36
+	qb422016 := qt422016.AcquireByteBuffer()
+//line templates/rename.qtpl:36
+	writecannotRenameDueToNonExistence(qb422016, hyphaName)
+//line templates/rename.qtpl:36
+	qs422016 := string(qb422016.B)
+//line templates/rename.qtpl:36
+	qt422016.ReleaseByteBuffer(qb422016)
+//line templates/rename.qtpl:36
+	return qs422016
+//line templates/rename.qtpl:36
+}
--- a/util/util.go
+++ b/util/util.go
@ -25,3 +25,14 @@ func HTTP200Page(w http.ResponseWriter, page string) {
 	w.WriteHeader(http.StatusOK)
 	w.Write([]byte(page))
 }
+
+// FindSubhyphae finds names of existing hyphae given the `hyphaIterator`.
+func FindSubhyphae(hyphaName string, hyphaIterator func(func(string))) []string {
+	subhyphae := make([]string, 0)
+	hyphaIterator(func(otherHyphaName string) {
+		if strings.HasPrefix(otherHyphaName, hyphaName+"/") {
+			subhyphae = append(subhyphae, otherHyphaName)
+		}
+	})
+	return subhyphae
+}