Better traversal; added persistent list expansion state

internal/ui/config/config.go

@@ -90,7 +90,25 @@ func Save() error {
 }
 
 // Restore the global config. IsNotExist is not an error and will not be
-// returned.
+// logged.
-func Restore() error {
+func Restore() {
-	return UnmarshalFromFile(ConfigFile, &sections)
+	if err := UnmarshalFromFile(ConfigFile, &sections); err != nil {
+		log.Error(errors.Wrap(err, "Failed to unmarshal main config.json"))
+	}
+
+	log.Printlnf("To restore: %#v", toRestore)
+
+	for path, v := range toRestore {
+		if err := UnmarshalFromFile(path, v); err != nil {
+			log.Error(errors.Wrapf(err, "Failed to unmarshal %s", path))
+		}
+	}
+}
+
+var toRestore = map[string]interface{}{}
+
+// RegisterConfig adds the config filename into the registry of value pointers
+// to unmarshal configs to.
+func RegisterConfig(filename string, jsonValue interface{}) {
+	toRestore[filename] = jsonValue
 }

internal/ui/config/file.go

@@ -2,6 +2,7 @@ package config
 
 import (
 	"encoding/json"
+	"io"
 	"log"
 	"os"
 	"path/filepath"
@@ -33,6 +34,13 @@ func __init() {
 	}
 }
 
+// PrettyMarshal pretty marshals v into dst as formatted JSON.
+func PrettyMarshal(dst io.Writer, v interface{}) error {
+	enc := json.NewEncoder(dst)
+	enc.SetIndent("", "\t")
+	return enc.Encode(v)
+}
+
 // DirPath returns the config directory.
 func DirPath() string {
 	// Ensure that files and folders are initialized.
@@ -41,6 +49,24 @@ func DirPath() string {
 	return dirPath
 }
 
+// SaveToFile saves the given bytes into the given filename. The filename will
+// be prepended with the config directory.
+func SaveToFile(file string, v []byte) error {
+	file = filepath.Join(DirPath(), file)
+
+	f, err := os.OpenFile(file, os.O_CREATE|os.O_WRONLY|os.O_SYNC|os.O_TRUNC, 0644)
+	if err != nil {
+		return errors.Wrap(err, "Failed to open file")
+	}
+	defer f.Close()
+
+	if _, err := f.Write(v); err != nil {
+		return errors.Wrap(err, "Failed to write")
+	}
+
+	return nil
+}
+
 // MarshalToFile marshals the given interface into the given filename. The
 // filename will be prepended with the config directory.
 func MarshalToFile(file string, from interface{}) error {
@@ -52,10 +78,7 @@ func MarshalToFile(file string, from interface{}) error {
 	}
 	defer f.Close()
 
-	enc := json.NewEncoder(f)
+	if err := PrettyMarshal(f, from); err != nil {
-	enc.SetIndent("", "\t")
-
-	if err := enc.Encode(from); err != nil {
 		return errors.Wrap(err, "Failed to marshal given struct")
 	}
 

internal/ui/messages/header.go

@@ -148,7 +148,7 @@ func (h *Header) SetBreadcrumber(b traverse.Breadcrumber) {
 		return
 	}
 
-	h.breadcrumbs = b.Breadcrumb()
+	h.breadcrumbs = traverse.TryBreadcrumb(b)
 	if len(h.breadcrumbs) < 2 {
 		return
 	}

internal/ui/service/config/config.go

@@ -1,3 +1,5 @@
+// Package config contains UI widgets and renderers for cchat's Configurator
+// interface.
 package config
 
 import (

internal/ui/service/header.go

@@ -112,7 +112,7 @@ func (h *Header) SetBreadcrumber(b traverse.Breadcrumber) {
 		return
 	}
 
-	if crumb := b.Breadcrumb(); len(crumb) > 0 {
+	if crumb := traverse.TryBreadcrumb(b); len(crumb) > 0 {
 		h.SvcName.SetText(crumb[0])
 	} else {
 		h.SvcName.SetText("")

internal/ui/service/savepath/savepath.go

@@ -0,0 +1,109 @@
+package savepath
+
+import (
+	"bytes"
+	"time"
+
+	"github.com/diamondburned/cchat-gtk/internal/gts"
+	"github.com/diamondburned/cchat-gtk/internal/log"
+	"github.com/diamondburned/cchat-gtk/internal/ui/config"
+	"github.com/diamondburned/cchat-gtk/internal/ui/service/session/server/traverse"
+	"github.com/pkg/errors"
+)
+
+// map of services to a list of list of IDs.
+var paths = make(pathMap)
+
+type pathMap map[string]pathMap
+
+const configName = "savepaths.json"
+
+func init() {
+	config.RegisterConfig(configName, &paths)
+}
+
+// ActiveSetter is an interface for all widgets that allow setting the active
+// state.
+type ActiveSetter interface {
+	SetActive(bool)
+}
+
+// Restore restores the expand state by calling SetActive. This is meant to be
+// used on a ToggledButton.
+func Restore(b traverse.Breadcrumber, asetter ActiveSetter) {
+	if IsExpanded(b) {
+		asetter.SetActive(true)
+	}
+}
+
+// IsExpanded returns true if the current breadcrumb node is expanded.
+func IsExpanded(b traverse.Breadcrumber) bool {
+	var path = traverse.TryID(b)
+	var node = paths
+
+	// Descend and traverse.
+	var nest = 0
+	for ; nest < len(path); nest++ {
+		ch, ok := node[path[nest]]
+		if !ok {
+			return false
+		}
+
+		node = ch
+	}
+
+	// Return true if there is available a path that at least matches with the
+	// breadcrumb path.
+	return nest == len(path)
+}
+
+// SaveDelay is the delay to wait before saving.
+const SaveDelay = 5 * time.Second
+
+var lastSaved int64
+
+// Save saves the list of paths. This function is not thread-safe. It is also
+// non-blocking.
+func Save() {
+	var now = time.Now().UnixNano()
+
+	if (lastSaved + int64(SaveDelay)) > now {
+		return
+	}
+
+	lastSaved = now
+
+	gts.AfterFunc(SaveDelay, func() {
+		var buf bytes.Buffer
+
+		// Marshal in the same thread to avoid race conditions.
+		if err := config.PrettyMarshal(&buf, paths); err != nil {
+			log.Error(errors.Wrap(err, "Failed to marshal paths"))
+			return
+		}
+
+		go func() {
+			if err := config.SaveToFile(configName, buf.Bytes()); err != nil {
+				log.Error(errors.Wrap(err, "Failed to save paths"))
+			}
+		}()
+	})
+}
+
+func Update(b traverse.Breadcrumber, expanded bool) {
+	var path = traverse.TryID(b)
+	var node = paths
+
+	// Descend and initialize.
+	for i := 0; i < len(path); i++ {
+		ch, ok := node[path[i]]
+		if !ok {
+			ch = make(pathMap)
+			node[path[i]] = ch
+		}
+
+		node = ch
+	}
+
+	Save()
+}

internal/ui/service/service.go

@@ -208,8 +208,12 @@ func (s *Service) MoveSession(id, movingID string) {
 	s.SaveAllSessions()
 }
 
-func (s *Service) Breadcrumb() traverse.Breadcrumb {
+func (s *Service) Breadcrumb() string {
-	return traverse.TryBreadcrumb(nil, s.service.Name().Content)
+	return s.service.Name().Content
+}
+
+func (s *Service) ParentBreadcrumb() traverse.Breadcrumber {
+	return nil
 }
 
 func (s *Service) SaveAllSessions() {

internal/ui/service/session/server/children.go

@@ -5,6 +5,7 @@ import (
 	"github.com/diamondburned/cchat-gtk/internal/gts"
 	"github.com/diamondburned/cchat-gtk/internal/ui/primitives"
 	"github.com/diamondburned/cchat-gtk/internal/ui/service/loading"
+	"github.com/diamondburned/cchat-gtk/internal/ui/service/savepath"
 	"github.com/diamondburned/cchat-gtk/internal/ui/service/session/server/traverse"
 	"github.com/gotk3/gotk3/gtk"
 )
@@ -180,6 +181,9 @@ func (c *Children) LoadAll() {
 			row.Show()
 			c.Box.Add(row)
 		}
+
+		// Restore expansion if possible.
+		savepath.Restore(row, row.Button)
 	}
 
 	// Check if we have icons.
@@ -227,6 +231,6 @@ func (c *Children) saveSelectedRow() (restore func()) {
 	}
 }
 
-func (c *Children) Breadcrumb() traverse.Breadcrumb {
+func (c *Children) ParentBreadcrumb() traverse.Breadcrumber {
-	return traverse.TryBreadcrumb(c.Parent)
+	return c.Parent
 }

internal/ui/service/session/server/server.go

@@ -7,6 +7,7 @@ import (
 	"github.com/diamondburned/cchat-gtk/internal/ui/primitives/menu"
 	"github.com/diamondburned/cchat-gtk/internal/ui/primitives/roundimage"
 	"github.com/diamondburned/cchat-gtk/internal/ui/rich"
+	"github.com/diamondburned/cchat-gtk/internal/ui/service/savepath"
 	"github.com/diamondburned/cchat-gtk/internal/ui/service/session/server/button"
 	"github.com/diamondburned/cchat-gtk/internal/ui/service/session/server/traverse"
 	"github.com/diamondburned/cchat/text"
@@ -24,7 +25,19 @@ func AssertUnhollow(hollower interface{ IsHollow() bool }) {
 }
 
 type ServerRow struct {
-	*Row
+	*gtk.Box
+	Avatar *roundimage.Avatar
+	Button *button.ToggleButtonImage
+
+	parentcrumb traverse.Breadcrumber
+
+	// non-nil if server list and the function returns error
+	childrenErr error
+
+	childrev   *gtk.Revealer
+	children   *Children
+	serverList cchat.ServerList
+
 	ctrl   Controller
 	Server cchat.Server
 
@@ -49,7 +62,7 @@ var serverCSS = primitives.PrepareClassCSS("server", `
 // hollow children containers and rows for the given server.
 func NewHollowServer(p traverse.Breadcrumber, sv cchat.Server, ctrl Controller) *ServerRow {
 	var serverRow = &ServerRow{
-		Row:          NewHollowRow(p),
+		parentcrumb:  p,
 		ctrl:         ctrl,
 		Server:       sv,
 		cancelUnread: func() {},
@@ -84,12 +97,30 @@ func (r *ServerRow) Init() {
 	}
 
 	// Initialize the row, which would fill up the button and others as well.
-	r.Row.Init(r.Server.Name())
+	r.Avatar = roundimage.NewAvatar(IconSize)
-	r.Row.SetIconer(r.Server)
+	r.Avatar.SetText(r.Server.Name().Content)
-	serverCSS(r.Row)
+	r.Avatar.Show()
+
+	btn := rich.NewCustomToggleButtonImage(r.Avatar, r.Server.Name())
+	btn.Show()
+
+	r.Button = button.WrapToggleButtonImage(btn)
+	r.Button.Box.SetHAlign(gtk.ALIGN_START)
+	r.Button.SetRelief(gtk.RELIEF_NONE)
+	r.Button.Show()
+
+	r.Box, _ = gtk.BoxNew(gtk.ORIENTATION_VERTICAL, 0)
+	r.Box.PackStart(r.Button, false, false, 0)
+	serverCSS(r.Box)
+
+	// Ensure errors are displayed.
+	r.childrenSetErr(r.childrenErr)
+
+	// Try to set an icon.
+	r.SetIconer(r.Server)
 
 	// Connect the destroyer, if any.
-	r.Row.Connect("destroy", r.cancelUnread)
+	r.Connect("destroy", r.cancelUnread)
 
 	// Restore the read state.
 	r.Button.SetUnreadUnsafe(r.unread, r.mentioned) // update with state
@@ -151,60 +182,13 @@ func (r *ServerRow) SetUnreadUnsafe(unread, mentioned bool) {
 	traverse.TrySetUnread(r.parentcrumb, r.Server.ID(), r.unread, r.mentioned)
 }
 
-type Row struct {
+func (r *ServerRow) IsHollow() bool {
-	*gtk.Box
-	Avatar *roundimage.Avatar
-	Button *button.ToggleButtonImage
-
-	parentcrumb traverse.Breadcrumber
-
-	// non-nil if server list and the function returns error
-	childrenErr error
-
-	childrev   *gtk.Revealer
-	children   *Children
-	serverList cchat.ServerList
-}
-
-func NewHollowRow(parent traverse.Breadcrumber) *Row {
-	return &Row{
-		parentcrumb: parent,
-	}
-}
-
-func (r *Row) IsHollow() bool {
 	return r.Box == nil
 }
 
-// Init initializes the row from its initial hollow state. It does nothing after
-// the first call.
-func (r *Row) Init(name text.Rich) {
-	if !r.IsHollow() {
-		return
-	}
-
-	r.Avatar = roundimage.NewAvatar(IconSize)
-	r.Avatar.SetText(name.Content)
-	r.Avatar.Show()
-
-	btn := rich.NewCustomToggleButtonImage(r.Avatar, name)
-	btn.Show()
-
-	r.Button = button.WrapToggleButtonImage(btn)
-	r.Button.Box.SetHAlign(gtk.ALIGN_START)
-	r.Button.SetRelief(gtk.RELIEF_NONE)
-	r.Button.Show()
-
-	r.Box, _ = gtk.BoxNew(gtk.ORIENTATION_VERTICAL, 0)
-	r.Box.PackStart(r.Button, false, false, 0)
-
-	// Ensure errors are displayed.
-	r.childrenSetErr(r.childrenErr)
-}
-
 // SetHollowServerList sets the row to a hollow server list (children) and
 // recursively create
-func (r *Row) SetHollowServerList(list cchat.ServerList, ctrl Controller) {
+func (r *ServerRow) SetHollowServerList(list cchat.ServerList, ctrl Controller) {
 	r.serverList = list
 
 	r.children = NewHollowChildren(r, ctrl)
@@ -230,7 +214,7 @@ func (r *Row) SetHollowServerList(list cchat.ServerList, ctrl Controller) {
 }
 
 // Reset clears off all children servers. It's a no-op if there are none.
-func (r *Row) Reset() {
+func (r *ServerRow) Reset() {
 	if r.children != nil {
 		// Remove everything from the children container.
 		r.children.Reset()
@@ -244,7 +228,7 @@ func (r *Row) Reset() {
 	r.children = nil
 }
 
-func (r *Row) childrenSetErr(err error) {
+func (r *ServerRow) childrenSetErr(err error) {
 	// Update the state and only use this state field.
 	r.childrenErr = err
 
@@ -273,21 +257,29 @@ func (r *ServerRow) HasIcon() bool {
 	return !r.IsHollow() && r.Button.Image.GetRevealChild()
 }
 
-func (r *Row) Breadcrumb() traverse.Breadcrumb {
+func (r *ServerRow) ParentBreadcrumb() traverse.Breadcrumber {
-	if r.IsHollow() {
+	return r.parentcrumb
-		return nil
-	}
-	return traverse.TryBreadcrumb(r.parentcrumb, r.Button.GetText())
 }
 
-func (r *Row) SetLabelUnsafe(name text.Rich) {
+func (r *ServerRow) Breadcrumb() string {
+	if r.IsHollow() {
+		return ""
+	}
+	return r.Button.GetText()
+}
+
+func (r *ServerRow) ID() cchat.ID {
+	return r.Server.ID()
+}
+
+func (r *ServerRow) SetLabelUnsafe(name text.Rich) {
 	AssertUnhollow(r)
 
 	r.Button.SetLabelUnsafe(name)
 	r.Avatar.SetText(name.Content)
 }
 
-func (r *Row) SetIconer(v interface{}) {
+func (r *ServerRow) SetIconer(v interface{}) {
 	AssertUnhollow(r)
 
 	if iconer, ok := v.(cchat.Icon); ok {
@@ -297,7 +289,7 @@ func (r *Row) SetIconer(v interface{}) {
 }
 
 // SetLoading is called by the parent struct.
-func (r *Row) SetLoading() {
+func (r *ServerRow) SetLoading() {
 	AssertUnhollow(r)
 
 	r.SetSensitive(false)
@@ -307,7 +299,7 @@ func (r *Row) SetLoading() {
 // SetFailed is shared between the parent struct and the children list. This is
 // because both of those errors share the same appearance, just different
 // callbacks.
-func (r *Row) SetFailed(err error, retry func()) {
+func (r *ServerRow) SetFailed(err error, retry func()) {
 	AssertUnhollow(r)
 
 	r.SetSensitive(true)
@@ -318,7 +310,7 @@ func (r *Row) SetFailed(err error, retry func()) {
 
 // SetDone is shared between the parent struct and the children list. This is
 // because both will use the same SetFailed.
-func (r *Row) SetDone() {
+func (r *ServerRow) SetDone() {
 	AssertUnhollow(r)
 
 	r.Button.SetNormal()
@@ -326,7 +318,7 @@ func (r *Row) SetDone() {
 	r.SetTooltipText("")
 }
 
-func (r *Row) SetNormalExtraMenu(items []menu.Item) {
+func (r *ServerRow) SetNormalExtraMenu(items []menu.Item) {
 	AssertUnhollow(r)
 
 	r.Button.SetNormalExtraMenu(items)
@@ -335,13 +327,13 @@ func (r *Row) SetNormalExtraMenu(items []menu.Item) {
 }
 
 // SetSelected is used for highlighting the current message server.
-func (r *Row) SetSelected(selected bool) {
+func (r *ServerRow) SetSelected(selected bool) {
 	AssertUnhollow(r)
 
 	r.Button.SetSelected(selected)
 }
 
-func (r *Row) GetActive() bool {
+func (r *ServerRow) GetActive() bool {
 	if !r.IsHollow() {
 		return r.Button.GetActive()
 	}
@@ -351,7 +343,7 @@ func (r *Row) GetActive() bool {
 
 // SetRevealChild reveals the list of servers. It does nothing if there are no
 // servers, meaning if Row does not represent a ServerList.
-func (r *Row) SetRevealChild(reveal bool) {
+func (r *ServerRow) SetRevealChild(reveal bool) {
 	AssertUnhollow(r)
 
 	// Do the above noop check.
@@ -371,11 +363,14 @@ func (r *Row) SetRevealChild(reveal bool) {
 	// to call Servers on this. Now, we already know that there are hollow
 	// servers in the children container.
 	r.children.LoadAll()
+
+	// Save the path.
+	savepath.Update(r, reveal)
 }
 
 // GetRevealChild returns whether or not the server list is expanded, or always
 // false if there is no server list.
-func (r *Row) GetRevealChild() bool {
+func (r *ServerRow) GetRevealChild() bool {
 	AssertUnhollow(r)
 
 	if r.childrev != nil {

internal/ui/service/session/server/traverse/traverse.go

@@ -7,31 +7,76 @@
 package traverse
 
 import (
-	"strings"
+	"github.com/diamondburned/cchat"
 )
 
-type Breadcrumb []string
-
-func (b Breadcrumb) String() string {
-	return strings.Join([]string(b), "/")
-}
-
 // Breadcrumber is the base interface that other interfaces extend on. A child
 // must at minimum implement this interface to use any other.
 type Breadcrumber interface {
 	// Breadcrumb returns the parent's path before the children's breadcrumb.
 	// This method recursively joins the parent's crumb with the children's,
 	// then eventually make its way up to the root node.
-	Breadcrumb() Breadcrumb
+	ParentBreadcrumb() Breadcrumber
+}
+
+type BreadcrumbNamer interface {
+	// Breadcrumb returns the breadcrumb name.
+	Breadcrumb() string
+}
+
+// Traverse traverses the given breadcrumber recursively. If traverser returns
+// true, then the function halts. Traversal is done from parent down to
+// children.
+func Traverse(bc Breadcrumber, traverser func(b Breadcrumber) bool) {
+	if bc == nil {
+		return
+	}
+
+	var stack []Breadcrumber
+	for current := bc; current != nil; current = current.ParentBreadcrumb() {
+		stack = append(stack, current)
+	}
+
+	for _, bc := range stack {
+		if traverser(bc) {
+			return
+		}
+	}
 }
 
 // TryBreadcrumb accepts a nilable breadcrumber and handles it appropriately.
-func TryBreadcrumb(i Breadcrumber, appended ...string) []string {
+func TryBreadcrumb(i Breadcrumber) (breadcrumbs []string) {
-	if i == nil {
+	Traverse(i, func(b Breadcrumber) bool {
-		return appended
+		if namer, ok := b.(BreadcrumbNamer); ok {
+			breadcrumbs = append(breadcrumbs, namer.Breadcrumb())
+		}
+		return false
+	})
+
+	for l, r := 0, len(breadcrumbs)-1; l < r; l, r = l+1, r-1 {
+		breadcrumbs[l], breadcrumbs[r] = breadcrumbs[r], breadcrumbs[l]
 	}
 
-	return append(i.Breadcrumb(), appended...)
+	return
+}
+
+func TryID(i Breadcrumber, appended ...cchat.ID) (ids []cchat.ID) {
+	Traverse(i, func(b Breadcrumber) bool {
+		switch b := b.(type) {
+		case cchat.Identifier:
+			ids = append(ids, b.ID())
+		case BreadcrumbNamer:
+			ids = append(ids, b.Breadcrumb())
+		}
+
+		return false
+	})
+
+	for l, r := 0, len(ids)-1; l < r; l, r = l+1, r-1 {
+		ids[l], ids[r] = ids[r], ids[l]
+	}
+
+	return
 }
 
 // Unreadabler extends Breadcrumber to add unread states to the parent node.

internal/ui/service/session/session.go

@@ -217,8 +217,12 @@ func (r *Row) Reset() {
 	r.cmder = nil
 }
 
-func (r *Row) Breadcrumb() traverse.Breadcrumb {
+func (r *Row) ParentBreadcrumb() traverse.Breadcrumber {
-	return traverse.TryBreadcrumb(r.parentcrumb, r.Session.Name().Content)
+	return r.parentcrumb
+}
+
+func (r *Row) Breadcrumb() string {
+	return r.Session.Name().Content
 }
 
 // Activate executes whatever needs to be done. If the row has failed, then this

main.go

@@ -6,7 +6,6 @@ import (
 	"github.com/diamondburned/cchat-gtk/internal/ui"
 	"github.com/diamondburned/cchat-gtk/internal/ui/config"
 	"github.com/diamondburned/cchat/services"
-	"github.com/pkg/errors"
 
 	_ "github.com/diamondburned/cchat-discord"
 	_ "github.com/diamondburned/cchat-mock"
@@ -33,9 +32,7 @@ func main() {
 		}
 
 		// Restore the configs.
-		if err := config.Restore(); err != nil {
+		config.Restore()
-			log.Error(errors.Wrap(err, "Failed to restore config"))
-		}
 
 		return app
 	})

shell.nix

@@ -1,16 +1,6 @@
 { pkgs ? import <nixpkgs> {} }:
 
-# let hunspell = pkgs.hunspellWithDicts(with pkgs.hunspellDicts; [
+let libhandy = pkgs.libhandy.overrideAttrs(old: {
-# 		en-us
-# 		en-us-large
-# 	]);
-
-let hunspellWrapper = pkgs.hunspellWithDicts(with pkgs.hunspellDicts; [
-		en-us
-		en-us-large
-	]);
-
-	libhandy = pkgs.libhandy.overrideAttrs(old: {
 		name = "libhandy-0.90.0";
 		src  = builtins.fetchGit {
 			url = "https://gitlab.gnome.org/GNOME/libhandy.git";
@@ -29,8 +19,8 @@ in pkgs.stdenv.mkDerivation rec {
 	version = "0.0.2";
 
 	buildInputs =
-		[ libhandy hunspellWrapper ]
+		[ libhandy ]
-		++ (with pkgs; [ enchant2 gnome3.gspell gnome3.glib gnome3.gtk ]);
+		++ (with pkgs; [ gnome3.gspell gnome3.glib gnome3.gtk ]);
 
 	nativeBuildInputs = with pkgs; [
 		pkgconfig go