~geb/sup

8e52766183ade4df9503826cce18273af302cd84 — John Gebbie 2 years ago 
initial commit
patch browse .tar.gz 
11 files changed, 3247 insertions(+), 0 deletions(-)

A LICENSE
A README.md
A commands.go
A debug.go
A doc/sup.1.scd
A go.mod
A go.sum
A helper.go
A main.go
A room.go
A ui.go

A  => LICENSE +674 -0
@@ 1,674 @@
                    GNU GENERAL PUBLIC LICENSE
                       Version 3, 29 June 2007

 Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
 Everyone is permitted to copy and distribute verbatim copies
 of this license document, but changing it is not allowed.

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    This is free software, and you are welcome to redistribute it
    under certain conditions; type `show c' for details.

The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License.  Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".

  You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.

  The GNU General Public License does not permit incorporating your program
into proprietary programs.  If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library.  If this is what you want to do, use the GNU Lesser General
Public License instead of this License.  But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.


A  => README.md +13 -0
@@ 1,13 @@
# sup

sup is a [Matrix](https://matrix.org) client for your terminal.

This initial version doesn't store anything between sessions and so will take horribly long to start if you're in rooms with thousands of members.

See the [manpage](./doc/sup.1.scd) for a tutorial.

# From Source

You need *go* (>=1.19) and then run `go build`.

If you want to compile the manpage, you need *scdoc* and then run `scdoc < doc/sup.1.scd > sup.1`.


A  => commands.go +648 -0
@@ 1,648 @@
package main

import (
	"fmt"
	"github.com/pzl/tui/ansi"
	"maunium.net/go/mautrix"
	"maunium.net/go/mautrix/event"
	"maunium.net/go/mautrix/id"
	"os"
	"os/exec"
	"strconv"
	"strings"
)

func (app *App) pickRoom(room string, roomIDs []id.RoomID) id.RoomID {
	if room == "" {
		return app.RoomID
	}
	n, err := strconv.Atoi(room)
	if err == nil && n > 0 && n <= len(roomIDs) {
		return roomIDs[n-1]
	}
	for _, rid := range roomIDs {
		if string(rid) == room {
			return rid
		}
	}
	for _, rid := range roomIDs {
		if string(roomAlias(app.Client, rid)) == room {
			return rid
		}
		for _, a := range roomAltAliases(app.Client, rid) {
			if string(a) == room {
				return rid
			}
		}
	}
	for _, rid := range roomIDs {
		if strings.HasPrefix(app.roomTitle(rid), room) {
			return rid
		}
	}
	return ""
}

func (app *App) pickUpload(upload string) *Media {
	uid, err := strconv.Atoi(upload)
	if err != nil {
		return nil
	}
	for _, u := range app.Uploads[app.RoomID] {
		if u.ID == uid {
			return u
		}
	}
	return nil
}

func pickUser(user string, from []id.UserID) id.UserID {
	for _, uid := range from {
		if uid == id.UserID(user) {
			return uid
		}
	}
	return ""
}

func (app *App) Ban(user string) {
	uid := id.UserID(user)
	_, _, err := uid.ParseAndValidate()
	if err == nil {
		app.UI.Accept()
		req := &mautrix.ReqBanUser{UserID: uid}
		_, err := app.Client.BanUser(app.RoomID, req)
		if err != nil {
			app.UI.Notify(ansi.Red, "Failed to ban user: " + err.Error())
		}
	} else {
		app.UI.Reject()
	}
}

func (app *App) browse(rid id.RoomID) {
	app.UI.Accept()
	app.Screen = rid
	app.RoomID = rid
	app.Unseen[rid] = false
	app.UI.StatusBar.Title = app.roomTitle(rid)
	app.UI.StatusBar.Members = len(roomMembers(app.Client, rid))
	app.UI.Feed.Entries = nil
	for _, msg := range app.Messages[rid] {
		app.UI.Feed.Entries = append(app.UI.Feed.Entries, msg)
	}
	app.UI.Feed.Index = app.UI.Feed.scrollLimit()
	app.UI.Render()
}

func (app *App) browseSpace(rid id.RoomID) {
	app.Screen = rid
	app.RoomID = rid
	app.Unseen[rid] = false
	app.UI.StatusBar.Title = app.roomTitle(rid)
	app.UI.StatusBar.Members = len(roomMembers(app.Client, rid))
	app.UI.Feed.Entries = []Entry{entry("Sorry, spaces are not yet supported.")}
	app.UI.Feed.Index = app.UI.Feed.scrollLimit()
	app.UI.Accept()
	app.UI.Render()
}

func (app *App) Browse(roomShorthand string) {
	rid := app.pickRoom(roomShorthand, app.RoomList())
	if rid == "" || roomMembership(app.Client, rid) != event.MembershipJoin {
		app.UI.Reject()
	} else {
		if roomIsSpace(app.Client, rid) {
			app.browseSpace(rid)
		} else {
			app.browse(rid)
		}
	}
}

func (app *App) createDirectChat(uid id.UserID) {
	app.UI.Accept()
	req := &mautrix.ReqCreateRoom{
		Preset:   "trusted_private_chat",
		Invite:   []id.UserID{uid},
		IsDirect: true,
	}
	resp, err := app.Client.CreateRoom(req)
	if err == nil {
		err := setAsDirectChat(app.Client, resp.RoomID, uid)
		if err == nil {
			app.UI.Notify(0, "Created a direct chat and invited " + string(uid))
		} else {
			app.UI.Notify(ansi.Yellow, "Failed to set created room as direct chat: " + err.Error())
		}
		app.refreshRoomDetials(resp.RoomID)
	} else {
		app.UI.Notify(ansi.Red, "Failed to create direct chat: " + err.Error())
	}
}

func (app *App) Create(roomName string) {
	app.UI.Accept()
	req := mautrix.ReqCreateRoom{Name: roomName}
	resp, err := app.Client.CreateRoom(&req)
	if err == nil {
		app.UI.Notify(0, "Created " + roomName)
		app.refreshRoomDetials(resp.RoomID)
	} else {
		app.UI.Notify(ansi.Red, "Failed to create room: " + err.Error())
	}
}

func (app *App) Download(media string) {
	u := app.pickUpload(media)
	if u == nil {
		app.UI.Reject()
	} else {
		app.UI.Accept()
		data, err := u.Download(app.Client)
		if err == nil {
			err := writeFile(u.Name, data, 0600)
			if err == nil {
				app.UI.Notify(0, "Downloaded " + u.Name)
			} else {
				app.UI.Notify(ansi.Red, "Failed to write file: " + err.Error())
			}
		} else {
			app.UI.Notify(ansi.Red, "Failed to download: " + err.Error())
		}
	}
}

func (app *App) Forget(room string) {
	rid := app.pickRoom(room, app.RoomList())
	if rid == "" {
		app.UI.Reject()
	} else {
		app.UI.Accept()
		_, err := app.Client.ForgetRoom(rid)
		if err == nil {
			delete(app.Messages, rid)
			if app.RoomID == rid || app.Screen == RoomsScreen {
				app.roomsScreen()
			}
		} else {
			app.UI.Notify(ansi.Red, "Failed to forget room: " + err.Error())
		}
	}
}

func (app *App) Invite(user string) {
	uid := id.UserID(user)
	_, _, err := uid.ParseAndValidate()
	if err != nil {
		app.UI.Reject()
		return
	}
	if app.Screen == RoomsScreen {
		app.createDirectChat(uid)
	} else {
		app.UI.Accept()
		req := &mautrix.ReqInviteUser{UserID: uid}
		_, err := app.Client.InviteUser(app.RoomID, req)
		if err == nil {
			app.UI.Notify(0, "Invited " + string(uid))
		} else {
			app.UI.Notify(ansi.Red, "Failed to invite user: " + err.Error())
		}
	}
}

func (app *App) Join(room string) {
	rid := app.pickRoom(room, app.RoomList())
	var err error
	if rid == "" {
		_, err = app.Client.JoinRoom(room, "", nil)
	} else {
		_, err = app.Client.JoinRoomByID(rid)
	}
	if err == nil {
		app.UI.Accept()
		app.UI.Notify(0, "Joined room: " + room)
	} else {
		app.UI.Notify(ansi.Red, "Failed to join room: " + err.Error())
	}
}

func (app *App) Kick(user string) {
	uid := pickUser(user, roomOtherMembers(app.Client, app.RoomID))
	if uid == "" {
		app.UI.Reject()
		return
	}
	req := &mautrix.ReqKickUser{UserID: uid}
	_, err := app.Client.KickUser(app.RoomID, req)
	if err == nil {
		app.UI.Accept()
		if uid == app.Client.UserID {
			app.roomsScreen()
		}
		app.UI.Notify(0, "Kicked " + string(uid))
	} else {
		app.UI.Notify(ansi.Red, "Failed to kick user: " + err.Error())
	}
}

func (app *App) leave(rid id.RoomID) {
	app.UI.Accept()
	title := app.roomTitle(rid)
	m := roomMembership(app.Client, rid)
	_, err := app.Client.LeaveRoom(rid)
	if err == nil {
		if m == event.MembershipInvite {
			app.UI.Notify(0, "Rejected invitation")
		} else {
			app.UI.Notify(0, "Left " + title)
		}
	} else {
		if m == event.MembershipInvite {
			app.UI.Notify(ansi.Red, "Failed to reject invitation: " + err.Error())
		} else {
			app.UI.Notify(ansi.Red, "Failed to leave room: " + err.Error())
		}
	}
}

func (app *App) Leave(roomShorthand string) {
	rid := app.pickRoom(roomShorthand, app.RoomList())
	if rid == "" {
		app.UI.Reject()
	} else {
		app.leave(rid)
		if app.Screen == rid {
			app.roomsScreen()
		}
	}
}

func setAsDirectChat(client *mautrix.Client, rid id.RoomID, uid id.UserID) error {
	dc := event.DirectChatsEventContent{}
	if err := client.GetAccountData("m.direct", &dc); err != nil {
		return err
	}
	for user, rooms := range dc {
		for i, r := range rooms {
			if r == rid {
				dc[user] = append(dc[user][:i], dc[user][i+1:]...)
			}
		}
	}
	dc[uid] = append(dc[uid], rid)
	if err := client.SetAccountData("m.direct", dc); err != nil {
		return err
	}
	return nil
}

func unsetAsDirectChat(client *mautrix.Client, rid id.RoomID) error {
	dc := event.DirectChatsEventContent{}
	if err := client.GetAccountData("m.direct", &dc); err != nil {
		return err
	}
	for user, rooms := range dc {
		for i, r := range rooms {
			if r == rid {
				dc[user] = append(dc[user][:i], dc[user][i+1:]...)
			}
		}
	}
	if err := client.SetAccountData("m.direct", dc); err != nil {
		return err
	}
	return nil
}

func (app *App) MakeDirectChat(user string) {
	others := roomOtherUsers(app.Client, app.RoomID)
	var uid id.UserID
	if user == "" {
		if len(others) > 1 {
			app.UI.Accept()
			app.UI.Notify(ansi.Red, "Need to specify which user for direct chat")
			return
		}
		uid = others[0]
	} else {
		uid = pickUser(user, others)
		if uid == "" {
			app.UI.Reject()
			return
		}
	}
	app.UI.Accept()
	err := setAsDirectChat(app.Client, app.RoomID, uid)
	if err == nil {
		app.refreshRoomDetials(app.RoomID)
		app.UI.Notify(0, "Set room as direct chat with " + string(uid))
	} else {
		app.UI.Notify(ansi.Red, "Failed to set as direct chat: " + err.Error())
	}
}

func (app *App) MakeGroupChat() {
	app.UI.Accept()
	err := unsetAsDirectChat(app.Client, app.RoomID)
	if err == nil {
		app.refreshRoomDetials(app.RoomID)
		app.UI.Notify(0, "Set room as group chat")
	} else {
		app.UI.Notify(ansi.Red, "Failed to set as group chat: " + err.Error())
	}
}

func (app *App) MakeHistoryVisibility(hv event.HistoryVisibility) {
	app.UI.Accept()
	c := event.HistoryVisibilityEventContent{HistoryVisibility: hv}
	_, err := app.Client.SendStateEvent(app.RoomID, event.StateHistoryVisibility, "", c)
	if err == nil {
		app.refreshRoomDetials(app.RoomID)
	} else {
		app.UI.Notify(ansi.Red, "Failed to set history visibility: " + err.Error())
	}
}

func (app *App) MakeJoinRule(jr event.JoinRule) {
	app.UI.Accept()
	c := event.JoinRulesEventContent{JoinRule: jr}
	_, err := app.Client.SendStateEvent(app.RoomID, event.StateJoinRules, "", c)
	if err == nil {
		app.refreshRoomDetials(app.RoomID)
	} else {
		app.UI.Notify(ansi.Red, "Failed to set access: " + err.Error())
	}
}

func (app *App) MakeName(name string) {
	app.UI.Accept()
	c := event.RoomNameEventContent{Name: name}
	_, err := app.Client.SendStateEvent(app.RoomID, event.StateRoomName, "", c)
	if err == nil {
		app.refreshRoomName(app.RoomID)
	} else {
		app.UI.Notify(ansi.Red, "Failed to name room: " + err.Error())
	}
}

func (app *App) MakeTopic(topic string) {
	app.UI.Accept()
	c := event.TopicEventContent{Topic: topic}
	_, err := app.Client.SendStateEvent(app.RoomID, event.StateTopic, "", c)
	if err == nil {
		app.refreshRoomDetials(app.RoomID)
	} else {
		app.UI.Notify(ansi.Red, "Failed to set topic: " + err.Error())
	}
}

func (app *App) membersScreen(rid id.RoomID) {
	app.Screen = MembersScreen
	app.RoomID = rid
	app.UI.StatusBar.Title = app.roomTitle(rid)
	app.UI.StatusBar.Members = len(roomMembers(app.Client, rid))
	room := app.Client.Store.LoadRoom(rid)
	events := room.State[event.StateMember]
	app.UI.Feed.Entries = make([]Entry, 0, len(events))
	for _, ev := range events {
		membership := "<error>"
		switch ev.Content.AsMember().Membership {
		case event.MembershipJoin:
			membership = ""
		case event.MembershipLeave:
			membership = "<left> "
		case event.MembershipInvite:
			membership = "<invited> "
		case event.MembershipBan:
			membership = "<banned> "
		case event.MembershipKnock:
			membership = "<requesting invite> "
		}
		line := membership + prettyUser(id.UserID(*ev.StateKey))
		app.UI.Feed.Entries = append(app.UI.Feed.Entries, entry(line))
	}
	app.UI.Render()
}

func (app *App) MembersScreen(room string) {
	rid := app.pickRoom(room, app.RoomList())
	if rid == "" {
		app.UI.Reject()
	} else {
		app.UI.Accept()
		app.UI.Feed.Index = 0
		app.membersScreen(rid)
	}
}

func (app *App) open(upload, cmd, msg string) {
	u := app.pickUpload(upload)
	if u == nil {
		app.UI.Reject()
	} else {
		app.UI.Accept()
		f, clean, err := u.TempFile(app.Client)
		if err == nil {
			go func() {
				defer clean()
				err := exec.Command(cmd, f.Name()).Run()
				if err != nil {
					app.UI.Notify(ansi.Red, msg + err.Error())
				}
			}()
		} else {
			app.UI.Notify(ansi.Red, err.Error())
		}
	}
}

func (app *App) openEnv(upload, env, msg string) {
	cmd := os.Getenv(env)
	if cmd == "" {
		app.UI.Accept()
		app.UI.Notify(ansi.Red, "$" + env + " is not set")
	} else {
		app.open(upload, cmd, msg)
	}
}

func (app *App) Open(upload string) {
	app.open(upload, "xdg-open", "Opening: ")
}

func (app *App) OpenAudio(upload string) {
	app.openEnv(upload, "AUDIO_PLAYER", "Audio Player: ")
}

func (app *App) OpenImage(upload string) {
	app.openEnv(upload, "IMAGE_VIEWER", "Image Viewer: ")
}

func (app *App) OpenVideo(upload string) {
	app.openEnv(upload, "VIDEO_PLAYER", "Video Player: ")
}

func (app *App) roomDescriptionScreen(rid id.RoomID) {
	app.Screen = RoomDescriptionScreen
	app.RoomID = rid
	app.UI.StatusBar.Title = app.roomTitle(rid)
	app.UI.StatusBar.Members = len(roomMembers(app.Client, rid))
	app.UI.Feed.Index = 0

	creator := prettyUser(roomCreator(app.Client, rid))
	direct := "false"
	if u := app.RoomDirectChatUser(rid); u != "" {
		direct = "with " + prettyUser(u)
	}
	histvis := roomHistoryVisibilityString(app.Client, rid)

	var aliases strings.Builder
	if a := roomAlias(app.Client, rid); a != "" {
		aliases.WriteString(fmt.Sprintf("%s%s%s\n", ansi.Bold, a, ansi.Reset))
	}
	for _, a := range roomAltAliases(app.Client, rid) {
		aliases.WriteString(fmt.Sprintf("         %s\n", string(a)))
	}

	app.UI.Feed.Entries = []Entry{
		entry(fmt.Sprintf("Creator: %s", creator)),
		entry(fmt.Sprintf("Topic: %s\n", roomTopic(app.Client, rid))),
		entry(fmt.Sprintf("Access: %s", roomJoinRule(app.Client, rid))),
		entry(fmt.Sprintf("History Visibility: %s", histvis)),
		entry(fmt.Sprintf("Encrypted: %t\n", roomIsEncrypted(app.Client, rid))),
		entry(fmt.Sprintf("Is Space: %t", roomIsSpace(app.Client, rid))),
		entry(fmt.Sprintf("Is Direct Chat (set per user): %s\n", direct)),
		entry(fmt.Sprintf("ID: %s", rid)),
		entry(fmt.Sprintf("Aliases: %s", aliases.String())),
	}

	app.UI.Render()
}

func (app *App) RoomDescriptionScreen(room string) {
	rid := app.pickRoom(room, app.RoomList())
	if rid == "" {
		app.UI.Reject()
	} else {
		app.UI.Accept()
		app.roomDescriptionScreen(rid)
	}
}

func (app *App) roomsScreen() {
	app.Screen = RoomsScreen
	app.UI.StatusBar.Title = "Rooms"
	app.UI.StatusBar.Members = 0

	headings := []string{
		"People:",
		"Private:",
		"Public:",
	}
	tags := []string{
		"<invited to> ",
		"",
		"<requesting> ",
		"<banned from> ",
		"<left> ",
	}
	app.UI.Feed.Entries = nil
	i := 1
	for ci, c := range CategoryOrder {
		app.UI.Feed.Entries = append(app.UI.Feed.Entries, entry(headings[ci]))
		for mi, m := range MembershipOrder {
			for _, rid := range app.Rooms(c, m) {
				name := roomName(app.Client, rid)
				user := roomCreator(app.Client, rid)
				if c.direct {
					user = app.RoomDirectChatUser(rid)
				}
				if roomIsSpace(app.Client, rid) {
					name = fmt.Sprintf("%s%s%s%s", ansi.It, ansi.Underline, name, ansi.Reset)
				}
				if name != "" {
					name += " "
				}
				line := fmt.Sprintf("[%d] %s%s%s", i, tags[mi], name, prettyUser(user))
				if unread := app.Unread[rid]; unread > 0 {
					line += fmt.Sprintf(" {%d UNREAD}", unread)
				} else if app.Unseen[rid] {
					line += " !"
				}
				app.UI.Feed.Entries = append(app.UI.Feed.Entries, entry(line))
				i++
			}
		}
		app.UI.Feed.Entries = append(app.UI.Feed.Entries, entry(""))
	}

	app.UI.Render()
}

func (app *App) RoomsScreen() {
	app.UI.Accept()
	app.UI.Feed.Index = 0
	app.roomsScreen()
}

func (app *App) Say(msg string) {
	app.UI.Accept()
	go func() {
		if _, err := app.Client.SendText(app.RoomID, msg); err != nil {
			app.UI.Notify(ansi.Red, "Failed to send text: " + err.Error())
		}
	}()
}

func (app *App) Unban(user string) {
	uid := pickUser(user, roomOtherUsersBanned(app.Client, app.RoomID))
	if uid == "" {
		app.UI.Reject()
	} else {
		app.UI.Accept()
		req := &mautrix.ReqUnbanUser{UserID: uid}
		_, err := app.Client.UnbanUser(app.RoomID, req)
		if err != nil {
			app.UI.Notify(ansi.Red, "Failed to unban user: " + err.Error())
		}
	}
}

func (app *App) upload(file *os.File) {
	stat, err := file.Stat()
	if err != nil {
		app.UI.Reject()
		return
	}
	app.UI.Accept()
	resp, err := app.Client.UploadMedia(mautrix.ReqUploadMedia{
		Content: file,
		ContentLength: stat.Size(),
		ContentType: string(event.MsgFile),
	})
	if err != nil {
		app.UI.Notify(ansi.Red, "Failed to upload file: " + err.Error())
		return
	}
	c := event.MessageEventContent{
		MsgType: event.MsgFile,
		Body: stat.Name(),
		URL: resp.ContentURI.CUString(),
	}
	_, err = app.Client.SendMessageEvent(app.RoomID, event.EventMessage, c)
	if err != nil {
		app.UI.Notify(ansi.Red, "Failed send file: " + err.Error())
	}
}

func (app *App) Upload(path string) {
	f, err := os.Open(expandPath(path))
	if err == nil {
		defer f.Close()
		app.upload(f)
	} else {
		app.UI.Reject()
	}
}


A  => debug.go +10 -0
@@ 1,10 @@
package main

import (
	"fmt"
	"os/exec"
)

func N(a ...any) {
	_ = exec.Command("notify-send", fmt.Sprint(a...)).Run()
}


A  => doc/sup.1.scd +196 -0
@@ 1,196 @@
sup(1)

# NAME

*sup* - Terminal Matrix client

# SYNOPSIS

*sup*
*sup* *--help*

# DESCRIPTION

*sup* is a Matrix client for real-time chat with a command driven user interface.

# OPTIONS

*-h*, *--help*
	Print help and exit.

# LOGGING IN

You need an existing Matrix account on a server of your choice.
*sup* uses the environment variables *SUP_HOMESEVER*, *SUP_USERNAME* and *SUP_PASSWORD* to log in, or prompts you to type them if they are unset.

For example, this would just prompt for a password:
	*SUP_HOMESEVER=matrix.org SUP_USERNAME=example sup*

# TUTORIAL

The initial screen lists the rooms you are a member of or invited to.
Let's create a new room by typing *create My Room* and pressing Enter.
We can browse it by entering *b* and its number or the start of its name if its unique, like *b 4* or *b My Ro*.
You could now say something with the *s* command like *s sup lads*, but you'll be talking to the void.
We could invite a friend to our room using *invite @example:matrix.org*, or return to the rooms screen with *r*.

If we want to accept an invitation, we can use *join* and pass the room's number or name.
Commands can also take a room's official ID or alias, so we could join a public room using *join #matrix:matrix.org* or *join !OGEhHVWSdvArJzumhm:matrix.org*.
There's also *leave* to leave a room or reject an invitation.

Rooms we *create* start off as private chats requiring an invitation, but they can then be changed.
If we browse a room or inspect one with the *room* command, we can then use one of the commands beginning with *make-* to tweak it.
We could make it public with *make-public* and privite again with *make-private*, or set the topic with *make-topic crop rotation*.

You can use *make-direct-chat* to mark a room as a one-to-one chat rather than a group chat, but you can also just *invite* someone from the rooms screen to create direct chat with them.

Aside from commands, there are a few keybindings.
You can scroll up with Ctrl+u and down with Ctrl+d, and clear what you've typed with Escape or Ctrl+c.
The up and down arrow keys navigate your command history, and the Tab key auto-completes commands, rooms, users and filepaths.

There are no pop-up notifications when you get a message, but the three numbers at the top of the screen show how many direct/public/privite chats have unseen messages, and you can check the rooms screen.

Command names end at the first non-letter so you can often omit the space and just do *b2* or *room9*, and even just *b* or *room* for the current room.

# COMMANDS

*ban* _user_
	Bans a user from the current room, kicking them if they are a member.

*browse*, *b* _room_
	Browses a room, making it the current room.

*create* _name_
	Creates a new private group chat.

*download*, *d* _upload_
	Downloads an upload to the current working directory.

*forget* _room_
	Forgets a room you were a member of, taking it off the room screen.

*invite* _user_
	Invites a user to the current room, or creates a new direct with them if you are at the rooms screen.

*join* _room_
	Joins a room or accepts an invitation.

*kick* _user_
	Removes a user from the current room, but does not ban them.

*leave* _room_
	Leaves a room or accepts an invitation.

*make-direct-chat*
	Marks the current room as a direct chat.

*make-group-chat*
	Marks the current room as a group chat.

*make-history-secret*
	Has messages of the current room from before each member joined be invisible to them.

*make-history-shared*
	Has messages of the current room from before each member joined be visible to them.

*make-name* _name_
	Sets the current room's name.

*make-private*
	Makes the current room require an invite to join.

*make-public*
	Makes the current room not require an invite to join.

*make-topic* _topic_
	Sets the current room's topic.

*members*, *m*
	Browses the members of a room, making it the current room.

*open*, *o* _upload_
	Opens an upload using the *xdg-open* command.

*open-audio*, *oa* _upload_
	Opens an upload using the environment variable *AUDIO_PLAYER*.

*open-image*, *oi* _upload_
	Opens an upload using the environment variable *IMAGE_VIEWER*.

*open-video*, *ov* _upload_
	Opens an upload using the environment variable *VIDEO_PLAYER*.

*quit*, *q*
	Terminates *sup*.

*room* _room_
	Browses the room's state, making it the current room.

*rooms*, *r*
	Browses the rooms screen, making there be no current room.

*say*, *s* _message_
	Sends a message to the current room.

*unban* _user_
	Unbans a user from the current room.

*upload*, *u* _filepath_
	Uploads a file to the current room.

A room is specified by its arbitrary number in the rooms screen, its ID, one of its aliases, or a unique prefix of its name.
If no room is specified, the current room is used.
Examples: *join 2*, *join #matrix:matrix.org*, *join !OGEhHVWSdvArJzumhm:matrix.org*, *join My Ro*.

A user is specified by their Matrix ID following form *@*_username_*:*_homeserver_.

An upload is specified by its arbitrary number.

# KEYBINDINGS

Escape or Ctrl+c
	Clear the command line.

Home or Ctrl+b
	Move the cursor to the start of the command line.

End or Ctrl+e
	Move the cursor to the end of the command line.

Ctrl+Backspace
	Delete to start of word.

Tab
	Auto-complete command, room, user or filepath.

Up
	Go up command history.

Down
	Go down command history.


Ctrl+l
	Refresh the screen.

Ctrl+j
	Scroll down a single entry.

Ctrl+k
	Scroll up a single entry.

Ctrl+d
	Scroll down half a screen.

Ctrl+u
	Scroll up half a screen.

PgDn
	Scroll down a screen.

PgUp
	Scroll up a screen.

# AUTHOR

John Gebbie


A  => go.mod +23 -0
@@ 1,23 @@
module git.sr.ht/~geb/sup

go 1.19

require (
	github.com/mattn/go-runewidth v0.0.12
	github.com/muesli/reflow v0.3.0
	github.com/pzl/tui v0.0.0-20201130221034-7267c4304bb3
	golang.org/x/term v0.0.0-20210927222741-03fcf44c2211
	maunium.net/go/mautrix v0.12.0
)

require (
	github.com/mattn/go-isatty v0.0.14 // indirect
	github.com/rivo/uniseg v0.2.0 // indirect
	github.com/tidwall/gjson v1.14.1 // indirect
	github.com/tidwall/match v1.1.1 // indirect
	github.com/tidwall/pretty v1.2.0 // indirect
	github.com/tidwall/sjson v1.2.4 // indirect
	golang.org/x/crypto v0.0.0-20220622213112-05595931fe9d // indirect
	golang.org/x/net v0.0.0-20220624214902-1bab6f366d9e // indirect
	golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a // indirect
)


A  => go.sum +48 -0
@@ 1,48 @@
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
github.com/mattn/go-isatty v0.0.7/go.mod h1:Iq45c/XA43vh69/j3iqttzPXn0bhXyGjM0Hdxcsrc5s=
github.com/mattn/go-isatty v0.0.14 h1:yVuAays6BHfxijgZPzw+3Zlu5yQgKGP2/hcQbHb7S9Y=
github.com/mattn/go-isatty v0.0.14/go.mod h1:7GGIvUiUoEMVVmxf/4nioHXj79iQHKdU27kJ6hsGG94=
github.com/mattn/go-runewidth v0.0.4/go.mod h1:LwmH8dsx7+W8Uxz3IHJYH5QSwggIsqBzpuz5H//U1FU=
github.com/mattn/go-runewidth v0.0.12 h1:Y41i/hVW3Pgwr8gV+J23B9YEY0zxjptBuCWEaxmAOow=
github.com/mattn/go-runewidth v0.0.12/go.mod h1:RAqKPSqVFrSLVXbA8x7dzmKdmGzieGRCM46jaSJTDAk=
github.com/muesli/reflow v0.3.0 h1:IFsN6K9NfGtjeggFP+68I4chLZV2yIKsXJFNZ+eWh6s=
github.com/muesli/reflow v0.3.0/go.mod h1:pbwTDkVPibjO2kyvBQRBxTWEEGDGq0FlB1BIKtnHY/8=
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
github.com/pzl/tui v0.0.0-20201130221034-7267c4304bb3 h1:grc/ip3Y4Psa0+oiUgq4YUtTJMIA4N1zTZDGpXSUCDY=
github.com/pzl/tui v0.0.0-20201130221034-7267c4304bb3/go.mod h1:fcmqDndm2ZYmfFo3DBpqYLzSLoQrV23KvIfI0M/Ou2E=
github.com/rivo/uniseg v0.1.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
github.com/rivo/uniseg v0.2.0 h1:S1pD9weZBuJdFmowNwbpi7BJ8TNftyUImj/0WQi72jY=
github.com/rivo/uniseg v0.2.0/go.mod h1:J6wj4VEh+S6ZtnVlnTBMWIodfgj8LQOQFoIToxlJtxc=
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
github.com/stretchr/testify v1.8.0 h1:pSgiaMZlXftHpm5L7V1+rVB+AZJydKsMxsQBIJw4PKk=
github.com/tidwall/gjson v1.12.1/go.mod h1:/wbyibRr2FHMks5tjHJ5F8dMZh3AcwJEMf5vlfC0lxk=
github.com/tidwall/gjson v1.14.1 h1:iymTbGkQBhveq21bEvAQ81I0LEBork8BFe1CUZXdyuo=
github.com/tidwall/gjson v1.14.1/go.mod h1:/wbyibRr2FHMks5tjHJ5F8dMZh3AcwJEMf5vlfC0lxk=
github.com/tidwall/match v1.1.1 h1:+Ho715JplO36QYgwN9PGYNhgZvoUSc9X2c80KVTi+GA=
github.com/tidwall/match v1.1.1/go.mod h1:eRSPERbgtNPcGhD8UCthc6PmLEQXEWd3PRB5JTxsfmM=
github.com/tidwall/pretty v1.2.0 h1:RWIZEg2iJ8/g6fDDYzMpobmaoGh5OLl4AXtGUGPcqCs=
github.com/tidwall/pretty v1.2.0/go.mod h1:ITEVvHYasfjBbM0u2Pg8T2nJnzm8xPwvNhhsoaGGjNU=
github.com/tidwall/sjson v1.2.4 h1:cuiLzLnaMeBhRmEv00Lpk3tkYrcxpmbU81tAY4Dw0tc=
github.com/tidwall/sjson v1.2.4/go.mod h1:098SZ494YoMWPmMO6ct4dcFnqxwj9r/gF0Etp19pSNM=
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
golang.org/x/crypto v0.0.0-20190426145343-a29dc8fdc734/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
golang.org/x/crypto v0.0.0-20220622213112-05595931fe9d h1:sK3txAijHtOK88l68nt020reeT1ZdKLIYetKl95FzVY=
golang.org/x/crypto v0.0.0-20220622213112-05595931fe9d/go.mod h1:IxCIyHEi3zRg3s0A5j5BB6A9Jmi73HwBIUl50j+osU4=
golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
golang.org/x/net v0.0.0-20220624214902-1bab6f366d9e h1:TsQ7F31D3bUCLeqPT0u+yjp1guoArKaNKmCr22PYgTQ=
golang.org/x/net v0.0.0-20220624214902-1bab6f366d9e/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20190222072716-a9d3bda3a223/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
golang.org/x/sys v0.0.0-20210630005230-0f9fa26af87c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a h1:dGzPydgVsqGcTRVwiLJ1jVbufYwmzD3LfVPLKsKg+0k=
golang.org/x/sys v0.0.0-20220520151302-bc2c85ada10a/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
golang.org/x/term v0.0.0-20210927222741-03fcf44c2211 h1:JGgROgKl9N8DuW20oFS5gxc+lE67/N3FcwmBPMe7ArY=
golang.org/x/term v0.0.0-20210927222741-03fcf44c2211/go.mod h1:jbD1KX2456YbFQfuXm/mYQcufACuNUgVhRMnK/tPxf8=
golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
maunium.net/go/mautrix v0.12.0 h1:jyT1TkJBIRJ7+OW7NhmMHmnEEBLsQe9ml+FYwSLhlaU=
maunium.net/go/mautrix v0.12.0/go.mod h1:hHvNi5iKVAiI2MAdAeXHtP4g9BvNEX2rsQpSF/x6Kx4=


A  => helper.go +55 -0
@@ 1,55 @@
package main

import (
	"fmt"
	"os"
	"path/filepath"
	"strings"
	"unicode"
)

func fatal(a ...any) {
	fmt.Fprintln(os.Stderr, a...)
	os.Exit(1)
}

func max(a, b int) int {
	if a > b {
		return a
	} else {
		return b
	}
}
func min(a, b int) int {
	if a < b {
		return a
	} else {
		return b
	}
}

func strings_TrimLeftSpace(s string) string {
	return strings.TrimLeftFunc(s, unicode.IsSpace)
}

func expandPath(path string) string {
	if path == "~" || (len(path) > 1 && path[0] == '~' && os.IsPathSeparator(path[1])) {
		home, err := os.UserHomeDir()
		if err == nil {
			return filepath.Join(home, path[1:])
		}
	}
	return path
}

func writeFile(name string, data []byte, perm os.FileMode) error {
	f, err := os.OpenFile(name, os.O_WRONLY|os.O_CREATE|os.O_EXCL, perm)
	if err != nil {
		return err
	}
	_, err = f.Write(data)
	if err1 := f.Close(); err1 != nil && err == nil {
		err = err1
	}
	return err
}


A  => main.go +704 -0
@@ 1,704 @@
package main

import (
	"bufio"
	"context"
	"fmt"
	"github.com/pzl/tui"
	"github.com/pzl/tui/ansi"
	"golang.org/x/term"
	"maunium.net/go/mautrix"
	"maunium.net/go/mautrix/event"
	"maunium.net/go/mautrix/id"
	"os"
	"strings"
	"time"
	"unicode"
)

type Media struct {
	ID int
	Kind event.MessageType
	URL id.ContentURI
	Name string
	data []byte
}

func (m *Media) Entry() string {
	return fmt.Sprintf("[%d] %s: %s", m.ID, string(m.Kind)[2:], m.Name)
}

func (m *Media) Download(client *mautrix.Client) ([]byte, error) {
	if len(m.data) > 0 {
		return m.data, nil
	}
	var err error
	m.data, err = client.DownloadBytes(m.URL)
	return m.data, err
}

func (m *Media) TempFile(client *mautrix.Client) (*os.File, func(), error) {
	data, err := m.Download(client)
	if err != nil {
		return nil, func() {}, err
	}
	f, err := os.CreateTemp("", "sup*_" + m.Name)
	clean := func() { f.Close(); os.Remove(f.Name()) }
	if err != nil {
		clean()
		return nil, func() {}, err
	}
	_, err = f.Write(data)
	if err != nil {
		clean()
		return nil, func() {}, err
	}
	return f, clean, nil
}


type Message struct {
	EventID id.EventID
	RoomID id.RoomID
	Sender id.UserID
	Time time.Time
	Body string
	IsEvent bool
	IsSpecial bool
	Media *Media
}

func daySuffix(n int) string {
	switch n {
	case 1, 21, 31:
		return "st"
	case 2, 22:
		return "nd"
	case 3, 23:
		return "rd"
	}
	return "th"
}

func (msg *Message) timeString() string {
	year, month, day := time.Now().Date()
	y, m, d := msg.Time.Date()
	var sb strings.Builder
	if y != year {
		sb.WriteString(fmt.Sprintf("%d %s %d%s ", y, m.String()[:3], d, daySuffix(d)))
	} else if m != month {
		sb.WriteString(fmt.Sprintf("%s %d%s ", m.String()[:3], d, daySuffix(d)))
	} else if d != day {
		sb.WriteString(fmt.Sprintf("%d%s ", d, daySuffix(d)))
	}
	sb.WriteString(fmt.Sprintf("%d:%02d", msg.Time.Hour(), msg.Time.Minute()))
	return sb.String()
}

func (msg *Message) Entry() string {
	pre := msg.timeString() + " " + prettyUser(msg.Sender)
	body := msg.Body
	if msg.IsEvent {
		body = fmt.Sprintf("%s%s%s%s", ansi.Dim, ansi.It, body, ansi.Reset)
	} else if msg.IsSpecial {
		body = fmt.Sprint(ansi.Bold, body, ansi.Reset)
	} else if msg.Media != nil {
		body = fmt.Sprint(ansi.Bold, msg.Media.Entry(), ansi.Reset)
	}
	return pre + " " + body
}

func normalMessage(ev *event.Event) *Message {
	c := ev.Content.AsMessage()
	ts := time.UnixMilli(ev.Timestamp)
	msg := Message{ev.ID, ev.RoomID, ev.Sender, ts, c.Body, false, false, nil}
	switch c.MsgType {
	case event.MsgFile, event.MsgImage, event.MsgVideo, event.MsgAudio:
		name := c.FileName
		if name == "" {
			name = msg.Body
		}
		msg.Media = &Media{0, c.MsgType, c.URL.ParseOrIgnore(), name, nil}
	case event.MsgEmote:
		msg.IsSpecial = true
		msg.Body = "*" + msg.Body + "*"
	case event.MsgNotice:
		msg.IsSpecial = true
		msg.Body = "notice: " + msg.Body
	case event.MsgLocation:
		msg.IsSpecial = true
		msg.Body = "location: " + c.GeoURI
	}
	return &msg
}

func eventMessage(ev *event.Event) *Message {
	c := ev.Content.AsMember()
	before := event.MembershipLeave
	if ev.Unsigned.PrevContent != nil {
		before = event.Membership(ev.Unsigned.PrevContent.Raw["membership"].(string))
	}
	ts := time.UnixMilli(ev.Timestamp)

	var body string
	switch c.Membership {
	case event.MembershipJoin:
		if before == event.MembershipJoin {
			body = "changed their name or avatar"
		} else {
			body = "joined"
		}
	case event.MembershipLeave:
		if before == event.MembershipInvite {
			if ev.Sender == id.UserID(*ev.StateKey) {
				body = "rejected their invite"
			} else {
				body = "revoked the invite of " + prettyUser(id.UserID(*ev.StateKey))
			}
		} else if before == event.MembershipKnock {
			if ev.Sender == id.UserID(*ev.StateKey) {
				body = "retracted their invite request"
			} else {
				body = "denied " + prettyUser(id.UserID(*ev.StateKey))
			}
		} else if before == event.MembershipBan {
			body = "unbanned " + prettyUser(id.UserID(*ev.StateKey))
		} else if ev.Sender == id.UserID(*ev.StateKey) {
			body = "left"
		} else {
			body = "kicked " + prettyUser(id.UserID(*ev.StateKey))
		}
	case event.MembershipInvite:
		body = "invited " + prettyUser(id.UserID(*ev.StateKey))
	case event.MembershipBan:
		body = "banned " + prettyUser(id.UserID(*ev.StateKey))
	case event.MembershipKnock:
		body = "requested an invite"
	}

	return &Message{ev.ID, ev.RoomID, ev.Sender, ts, body, true, false, nil}
}

func encryptedMessage(ev *event.Event) *Message {
	ts := time.UnixMilli(ev.Timestamp)
	body := "encrypted message (not yet supported)"
	return &Message{ev.ID, ev.RoomID, ev.Sender, ts, body, false, true, nil}
}


type App struct {
	Client *mautrix.Client
	UI *UI
	Screen id.RoomID
	RoomID id.RoomID
	Unseen map[id.RoomID] bool
	Messages map[id.RoomID][]*Message
	Uploads map[id.RoomID][]*Media
	ReadReceipts map[id.RoomID]id.EventID
	Unread map[id.RoomID]int
	DirectChats map[id.RoomID]id.UserID
}

func (app *App) unseenStatus() (direct int, private int, public int) {
	j := event.MembershipJoin
	for _, rid := range app.Rooms(CategoryOrder[0], j) {
		if app.Unseen[rid] {
			direct++
		}
	}
	for _, rid := range app.Rooms(CategoryOrder[1], j) {
		if app.Unseen[rid] {
			private++
		}
	}
	for _, rid := range app.Rooms(CategoryOrder[2], j) {
		if app.Unseen[rid] {
			public++
		}
	}
	return
}

func NewApp(client *mautrix.Client) *App {
	app := &App{
		client, nil, "", "",
		make(map[id.RoomID]bool),
		make(map[id.RoomID][]*Message),
		make(map[id.RoomID][]*Media),
		make(map[id.RoomID]id.EventID),
		make(map[id.RoomID]int),
		nil,
	}
	app.UI = NewUI(app.unseenStatus, app.tabComplete)
	return app
}

func (app *App) AddMessage(msg *Message) {
	app.Messages[msg.RoomID] = append(app.Messages[msg.RoomID], msg)
	if msg.Media != nil {
		msg.Media.ID = len(app.Uploads[msg.RoomID]) + 1
		app.Uploads[msg.RoomID] = append(app.Uploads[msg.RoomID], msg.Media)
	}

	if app.Screen == msg.RoomID {
		app.UI.Feed.Entries = append(app.UI.Feed.Entries, msg)
		limit := app.UI.Feed.scrollLimit()
		if limit > 0 {
			if app.UI.Feed.Index >= limit - GapBelowFeed - 1 {
				app.UI.Feed.Index++
			} else if msg.Sender != app.Client.UserID {
				app.UI.StatusBar.Blink = true
			}
		}
		app.UI.Render()
	} else if msg.Sender != app.Client.UserID && !msg.IsEvent {
		if !app.Unseen[msg.RoomID] {
			app.Unseen[msg.RoomID] = true
			app.UI.RenderStatusBar()
		}

		app.Unread[msg.RoomID]++
		if app.Screen == RoomsScreen {
			app.roomsScreen()
		}
	}
}

func (app *App) refreshRoomDetials(rid id.RoomID) {
	if app.Screen == RoomDescriptionScreen && app.RoomID == rid {
		app.roomDescriptionScreen(rid)
	}
}

func (app *App) refreshRoomName(rid id.RoomID) {
	if app.Screen == RoomsScreen {
		app.roomsScreen()
	} else if app.Screen == rid {
		app.UI.StatusBar.Title = app.roomTitle(rid)
		app.UI.Render()
	}
}

func (app *App) refreshRoomSoul(rid id.RoomID) {
	if app.Screen == RoomsScreen {
		app.roomsScreen()
	} else if app.Screen == RoomDescriptionScreen && app.RoomID == rid {
		app.roomDescriptionScreen(rid)
	}
}

func (app *App) storeDirectChats(c *event.DirectChatsEventContent) {
	app.DirectChats = make(map[id.RoomID]id.UserID)
	for uid, roomIDs := range *c {
		for _, rid := range roomIDs {
			app.DirectChats[rid] = uid
		}
	}
}

func (app *App) readReceiptIndex(rid id.RoomID) int {
	if _, ok := app.ReadReceipts[rid]; !ok {
		return 0
	}
	for i := len(app.Messages[rid])-1; i >= 0; i-- {
		if app.Messages[rid][i].EventID == app.ReadReceipts[rid] {
			return i
		}
	}
	return -1
}

func (app *App) unseen(rid id.RoomID) int {
	i := app.readReceiptIndex(rid)
	if i == -1 {
		return 0
	}
	for ; i < len(app.Messages[rid]); i++ {
		m := app.Messages[rid][i]
		if m.Sender != app.Client.UserID && !m.IsEvent {
			break
		}
	}
	return len(app.Messages[rid]) - i - 1
}

func (app *App) unread(rid id.RoomID) int {
	i := app.readReceiptIndex(rid)
	if i == -1 {
		return 0
	}
	for ; i < len(app.Messages[rid]); i++ {
		m := app.Messages[rid][i]
		if m.Sender != app.Client.UserID && !m.IsEvent {
			break
		}
	}
	// don't count joined, left, etc.
	for j := i + 1; j < len(app.Messages[rid]); j++ {
		if app.Messages[rid][j].IsEvent {
			i++
		}
	}
	return len(app.Messages[rid]) - i - 1
}

func (app *App) updateUnread(rid id.RoomID) {
	unread := app.Unread[rid]
	unseen := app.Unseen[rid]
	app.Unread[rid] = app.unread(rid)
	app.Unseen[rid] = app.unseen(rid) > 0
	if app.Unread[rid] != unread || app.Unseen[rid] != unseen {
		if app.Screen == RoomsScreen {
			app.roomsScreen()
		}
	}
}

func (app *App) sync() chan func() {
	syncer := app.Client.Syncer.(*mautrix.DefaultSyncer)
	updates := make(chan func())

	onEvent := func(t event.Type, h mautrix.EventHandler) {
		syncer.OnEventType(t, func(src mautrix.EventSource, ev *event.Event) {
			updates <- func() {
				h(src, ev)
			}
		})
	}
	store := func(src mautrix.EventSource, ev *event.Event) {
		app.Client.Store.(*mautrix.InMemoryStore).UpdateState(src, ev)
	}

	onEvent(event.StateEncryption, func(src mautrix.EventSource, ev *event.Event) {
		store(src, ev)
		app.refreshRoomDetials(ev.RoomID)
	})
	onEvent(event.StateCanonicalAlias, func(src mautrix.EventSource, ev *event.Event) {
		store(src, ev)
		app.refreshRoomDetials(ev.RoomID)
	})
	onEvent(event.StateCreate, func(src mautrix.EventSource, ev *event.Event) {
		store(src, ev)
		app.refreshRoomSoul(ev.RoomID)
	})
	onEvent(event.StateHistoryVisibility, func(src mautrix.EventSource, ev *event.Event) {
		store(src, ev)
		app.refreshRoomDetials(ev.RoomID)
	})
	onEvent(event.StateJoinRules, func(src mautrix.EventSource, ev *event.Event) {
		store(src, ev)
	})
	onEvent(event.StateMember, func(src mautrix.EventSource, ev *event.Event) {
		store(src, ev)
		if ev.Sender == app.Client.UserID {
			app.refreshRoomSoul(ev.RoomID)
		}
		app.AddMessage(eventMessage(ev))
	})
	onEvent(event.StateRoomName, func(src mautrix.EventSource, ev *event.Event) {
		store(src, ev)
		app.refreshRoomName(ev.RoomID)
	})
	onEvent(event.StateTopic, func(src mautrix.EventSource, ev *event.Event) {
		store(src, ev)
		app.refreshRoomDetials(ev.RoomID)
	})

	onEvent(event.EventEncrypted, func(src mautrix.EventSource, ev *event.Event) {
		app.AddMessage(encryptedMessage(ev))
	})
	onEvent(event.EventMessage, func(src mautrix.EventSource, ev *event.Event) {
		app.AddMessage(normalMessage(ev))
	})

	onEvent(event.AccountDataDirectChats, func(src mautrix.EventSource, ev *event.Event) {
		app.storeDirectChats(ev.Content.AsDirectChats())
		app.refreshRoomSoul(ev.RoomID)
	})

	onEvent(event.EphemeralEventReceipt, func(src mautrix.EventSource, ev *event.Event) {
		c := ev.Content.AsReceipt()
		for eid, receipts := range *c {
			if userReceipts, ok := receipts[event.ReceiptTypeRead]; ok {
				if _, ok := userReceipts[app.Client.UserID]; ok {
					app.ReadReceipts[ev.RoomID] = eid
					app.updateUnread(ev.RoomID)
				}
			}
		}
	})

	go func() {
		for {
			if err := app.Client.Sync(); err != nil {
				app.UI.Notify(ansi.Red, "Failed to sync: " + err.Error())
			}
			time.Sleep(time.Second)
		}
	}()

	return updates
}

var inRoomCommands = []string{
	"ban",
	"download", "d",
	"kick",
	"make-direct-chat",
	"make-group-chat",
	"make-history-secret",
	"make-history-shared",
	"make-name",
	"make-private",
	"make-public",
	"make-topic",
	"open", "o",
	"open-audio", "oa",
	"open-image", "oi",
	"open-video", "ov",
	"say", "s",
	"unban",
	"upload", "u",
}

var roomsScreenOrInRoomCommands = []string{
	"browse", "b",
	"create",
	"forget",
	"invite",
	"join",
	"leave",
	"members", "m",
	"quit", "q",
	"room",
	"rooms", "r",
}

func cutCmd(s string, cmd... string) (string, bool) {
	for _, c := range cmd {
		if s == c {
			return "", true
		}
		if strings.HasPrefix(s, c + " ") {
			return s[len(c) + 1:], true
		}
		if strings.HasPrefix(s, c) && !unicode.IsLetter(rune(s[len(c)])) {
			return s[len(c):], true
		}
	}
	return "", false
}

func (app *App) Do(cmd string) int {
	cmd = strings_TrimLeftSpace(cmd)
	fellthrough := false
	// In-room-only Commands
	if app.Screen != RoomsScreen {
		if user, ok := cutCmd(cmd, "ban"); ok {
			app.Ban(user)
		} else if media, ok := cutCmd(cmd, "download", "d"); ok {
			app.Download(media)
		} else if user, ok := cutCmd(cmd, "kick"); ok {
			app.Kick(user)
		} else if user, ok := cutCmd(cmd, "make-direct-chat"); ok {
			app.MakeDirectChat(user)
		} else if s, ok := cutCmd(cmd, "make-group-chat"); ok && len(s) == 0 {
			app.MakeGroupChat()
		} else if s, ok := cutCmd(cmd, "make-history-secret"); ok && len(s) == 0 {
			app.MakeHistoryVisibility(event.HistoryVisibilityJoined)
		} else if s, ok := cutCmd(cmd, "make-history-shared"); ok && len(s) == 0 {
			app.MakeHistoryVisibility(event.HistoryVisibilityShared)
		} else if name, ok := cutCmd(cmd, "make-name"); ok {
			app.MakeName(name)
		} else if s, ok := cutCmd(cmd, "make-private"); ok && len(s) == 0 {
			app.MakeJoinRule(event.JoinRuleInvite)
		} else if s, ok := cutCmd(cmd, "make-public"); ok && len(s) == 0 {
			app.MakeJoinRule(event.JoinRulePublic)
		} else if topic, ok := cutCmd(cmd, "make-topic"); ok {
			app.MakeTopic(topic)
		} else if media, ok := cutCmd(cmd, "open", "o"); ok {
			app.Open(media)
		} else if audio, ok := cutCmd(cmd, "open-audio", "oa"); ok {
			app.OpenAudio(audio)
		} else if image, ok := cutCmd(cmd, "open-image", "oi"); ok {
			app.OpenImage(image)
		} else if video, ok := cutCmd(cmd, "open-video", "ov"); ok {
			app.OpenVideo(video)
		} else if msg, ok := cutCmd(cmd, "say", "s"); ok {
			app.Say(msg)
		} else if user, ok := cutCmd(cmd, "unban"); ok {
			app.Unban(user)
		} else if path, ok := cutCmd(cmd, "upload", "u"); ok {
			app.Upload(path)
		} else {
			fellthrough = true
		}
	}
	// Rooms Screen and/or In-room Commands
	if app.Screen == RoomsScreen || fellthrough {
		if room, ok := cutCmd(cmd, "browse", "b"); ok {
			app.Browse(room)
		} else if room, ok := cutCmd(cmd, "create"); ok {
			app.Create(room)
		} else if room, ok := cutCmd(cmd, "forget"); ok {
			app.Forget(room)
		} else if user, ok := cutCmd(cmd, "invite"); ok {
			app.Invite(user)
		} else if room, ok := cutCmd(cmd, "join"); ok {
			app.Join(room)
		} else if room, ok := cutCmd(cmd, "leave"); ok {
			app.Leave(room)
		} else if room, ok := cutCmd(cmd, "members", "m"); ok {
			app.MembersScreen(room)
		} else if s, ok := cutCmd(cmd, "quit", "q"); ok && len(s) == 0 {
			return 0
		} else if room, ok := cutCmd(cmd, "room"); ok {
			app.RoomDescriptionScreen(room)
		} else if s, ok := cutCmd(cmd, "rooms", "r"); ok && len(s) == 0 {
			app.RoomsScreen()
		} else {
			app.UI.Reject()
		}
	}
	return -1
}

// alive marks messages read based off the scroll position.
func (app *App) alive() {
	if app.Screen == app.RoomID {
		// As a rule of thumb, mark all read if the bottom message is visible.
		if app.UI.Feed.Index >= app.UI.Feed.scrollLimit() - GapBelowFeed - 1 {
			r := app.readReceiptIndex(app.RoomID)
			i := len(app.Messages[app.RoomID]) - 1
			if r != -1 && i > r {
				eid := app.Messages[app.RoomID][i].EventID
				app.ReadReceipts[app.RoomID] = eid
				_ = app.Client.MarkRead(app.RoomID, eid)
				app.UI.StatusBar.Blink = false
			}
		}
	}
}

func (app *App) Run() int {
	app.UI.Ansi.Screen(ansi.Alt)
	defer app.UI.Ansi.Screen(ansi.Normal)
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()
	inputEvents, restoreInput, err := tui.GetInput(ctx, 0)
	defer restoreInput()
	if err != nil {
		fatal("Failed to capture terminal input: " + err.Error())
	}

	updates := app.sync()

	// Resize with terminal
	go func() {
		var width, height int
		for range time.Tick(200 * time.Millisecond) {
			w, h := tui.TermSize(0)
			if w != width || h != height {
				updates <- func() {
					app.UI.Resize(w, h)
					app.UI.Render()
				}
				width, height = w, h
			}
		}
	}()

	// Refresh every minute
	go func() {
		for range time.Tick(time.Minute) {
			updates <- func() { app.UI.Render() }
		}
	}()

	// Mainloop
	app.roomsScreen()
	app.UI.Resize(tui.TermSize(0))
	app.UI.Render()
	for {
		select {
		case ev := <- inputEvents:
			if cmd, ok := app.UI.Handle(ev); ok {
				code := app.Do(cmd)
				if code >= 0 {
					return code
				}
			}
			app.alive()
		case update := <- updates:
			update()
		}
	}
}

func login(homeserver, username, password string) (*mautrix.Client, error) {
	client, err := mautrix.NewClient(homeserver, "", "")
	if err != nil {
		return nil, err
	}
	_, err = client.Login(&mautrix.ReqLogin{
		Type: "m.login.password",
		Identifier: mautrix.UserIdentifier{
			Type: mautrix.IdentifierTypeUser,
			User: username,
		},
		Password: password,
		StoreCredentials: true,
	})
	if err != nil {
		return nil, err
	}
	return client, nil
}

func Login() *mautrix.Client {
	homeserver := os.Getenv("SUP_HOMESEVER")
	username := os.Getenv("SUP_USERNAME")
	password := os.Getenv("SUP_PASSWORD")

	scanner := bufio.NewScanner(os.Stdin)
	if len(homeserver) == 0 {
		fmt.Print("Homeserver: ")
		if !scanner.Scan() {
			fatal("\nProblem reading homeserver.")
		}
		homeserver = scanner.Text()
	}
	if len(username) == 0 {
		fmt.Print("Username: ")
		if !scanner.Scan() {
			fatal("\nProblem reading username.")
		}
		username = scanner.Text()
	}
	if len(password) == 0 {
		fmt.Print("Password: ")
		passwordBytes, err := term.ReadPassword(0)
		password = string(passwordBytes)
		if err != nil {
			fatal("\nProblem reading password.")
		}
	}

	client, err := login(homeserver, username, password)
	if err != nil {
		fatal("\n" + err.Error())
	}
	return client
}

func main() {
	if len(os.Args) > 1 {
		fmt.Println("Usage: sup\nSee the manpage for a tutorial.")
		os.Exit(0)
	}

	client := Login()
	defer client.Logout()
	app := NewApp(client)
	os.Exit(app.Run())
}


A  => room.go +252 -0
@@ 1,252 @@
package main

import (
	"maunium.net/go/mautrix"
	"maunium.net/go/mautrix/event"
	"maunium.net/go/mautrix/id"
	"sort"
)

func roomAlias(client *mautrix.Client, rid id.RoomID) id.RoomAlias {
	r := client.Store.LoadRoom(rid)
	ev := r.GetStateEvent(event.StateCanonicalAlias, "")
	if ev == nil {
		return ""
	}
	return ev.Content.AsCanonicalAlias().Alias
}

func roomAltAliases(client *mautrix.Client, rid id.RoomID) []id.RoomAlias {
	r := client.Store.LoadRoom(rid)
	ev := r.GetStateEvent(event.StateCanonicalAlias, "")
	if ev == nil {
		return nil
	}
	return ev.Content.AsCanonicalAlias().AltAliases
}

func roomCreator(client *mautrix.Client, rid id.RoomID) id.UserID {
	r := client.Store.LoadRoom(rid)
	ev := r.GetStateEvent(event.StateCreate, "")
	if ev == nil {
		return ""
	}
	return ev.Content.AsCreate().Creator
}

func (app *App) RoomDirectChatUser(rid id.RoomID) id.UserID {
	for r, uid := range app.DirectChats {
		if r == rid {
			return uid
		}
	}
	return ""
}

func roomHistoryVisibility(client *mautrix.Client, rid id.RoomID) event.HistoryVisibility {
	r := client.Store.LoadRoom(rid)
	ev := r.GetStateEvent(event.StateHistoryVisibility, "")
	if ev == nil {
		return event.HistoryVisibilityShared
	}
	return ev.Content.AsHistoryVisibility().HistoryVisibility
}

func roomHistoryVisibilityString(client *mautrix.Client, rid id.RoomID) string {
	hv := roomHistoryVisibility(client, rid)
	switch hv {
	case event.HistoryVisibilityInvited:
		return "secret (up to invite)"
	case event.HistoryVisibilityJoined:
		return "secret (up to join)"
	case event.HistoryVisibilityShared:
		return "shared"
	case event.HistoryVisibilityWorldReadable:
		return "world readable"
	}
	return string(hv)
}

func roomIsEncrypted(client *mautrix.Client, rid id.RoomID) bool {
	r := client.Store.LoadRoom(rid)
	return r.GetStateEvent(event.StateEncryption, "") != nil
}

func roomIsSpace(client *mautrix.Client, rid id.RoomID) bool {
	r := client.Store.LoadRoom(rid)
	ev := r.GetStateEvent(event.StateCreate, "")
	if ev == nil {
		return false
	}
	return ev.Content.AsCreate().Type == event.RoomTypeSpace
}

func roomJoinRule(client *mautrix.Client, rid id.RoomID) event.JoinRule {
	r := client.Store.LoadRoom(rid)
	ev := r.GetStateEvent(event.StateJoinRules, "")
	if ev == nil {
		return ""
	}
	return ev.Content.AsJoinRules().JoinRule
}

func roomMembers(client *mautrix.Client, rid id.RoomID) []id.UserID {
	r := client.Store.LoadRoom(rid)
	var uids []id.UserID
	for _, ev := range r.State[event.StateMember] {
		c := ev.Content.AsMember()
		if c.Membership == event.MembershipJoin {
			uids = append(uids, id.UserID(*ev.StateKey))
		}
	}
	return uids
}

func roomMembership(client *mautrix.Client, rid id.RoomID) event.Membership {
	r := client.Store.LoadRoom(rid)
	return r.GetMembershipState(client.UserID)
}

func roomName(client *mautrix.Client, rid id.RoomID) string {
	r := client.Store.LoadRoom(rid)
	ev := r.GetStateEvent(event.StateRoomName, "")
	if ev == nil {
		return ""
	}
	return ev.Content.AsRoomName().Name
}

func roomOtherMembers(client *mautrix.Client, rid id.RoomID) []id.UserID {
	r := client.Store.LoadRoom(rid)
	var uids []id.UserID
	for _, ev := range r.State[event.StateMember] {
		if id.UserID(*ev.StateKey) != client.UserID {
			c := ev.Content.AsMember()
			if c.Membership == event.MembershipJoin {
				uids = append(uids, id.UserID(*ev.StateKey))
			}
		}
	}
	return uids
}

func roomOtherUsers(client *mautrix.Client, rid id.RoomID) []id.UserID {
	r := client.Store.LoadRoom(rid)
	var uids []id.UserID
	for _, ev := range r.State[event.StateMember] {
		if id.UserID(*ev.StateKey) != client.UserID {
			uids = append(uids, id.UserID(*ev.StateKey))
		}
	}
	return uids
}

func roomOtherUsersBanned(client *mautrix.Client, rid id.RoomID) []id.UserID {
	r := client.Store.LoadRoom(rid)
	var uids []id.UserID
	for _, ev := range r.State[event.StateMember] {
		if id.UserID(*ev.StateKey) != client.UserID {
			c := ev.Content.AsMember()
			if c.Membership == event.MembershipBan {
				uids = append(uids, id.UserID(*ev.StateKey))
			}
		}
	}
	return uids
}

func (app *App) roomTitle(rid id.RoomID) string {
	t := string(app.RoomDirectChatUser(rid))
	if t == "" {
		t = roomName(app.Client, rid)
	}
	return t
}

func roomTopic(client *mautrix.Client, rid id.RoomID) string {
	r := client.Store.LoadRoom(rid)
	ev := r.GetStateEvent(event.StateTopic, "")
	if ev == nil {
		return ""
	}
	return ev.Content.AsTopic().Topic
}

// friends returns all the other members of the user's direct and private chats.
func (app *App) friends() []id.UserID {
	m := make(map[id.UserID]struct{})
	mask := RoomMask{true, true, true, false}
	for _, rid := range app.Rooms(mask, event.MembershipJoin) {
		for _, uid := range roomOtherUsers(app.Client, rid) {
			m[uid] = struct{}{}
		}
	}
	s := make([]id.UserID, 0, len(m))
	for uid := range m {
		s = append(s, uid)
	}
	return s
}


const (
	MembersScreen = id.RoomID("Members")
	RoomDescriptionScreen = id.RoomID("RoomDescription")
	RoomsScreen = id.RoomID("Rooms")
)

type RoomMask struct {
	group bool
	direct bool
	private bool
	public bool
}

func (app *App) roomMeets(rid id.RoomID, mask RoomMask) bool {
	d := app.RoomDirectChatUser(rid) != ""
	p := roomJoinRule(app.Client, rid) == event.JoinRulePublic
	return (d == mask.direct || d != mask.group) && (p == mask.public || p != mask.private)
}

func (app *App) Rooms(mask RoomMask, ships ...event.Membership) []id.RoomID {
	var roomIDs []id.RoomID
	for rid, room := range app.Client.Store.(*mautrix.InMemoryStore).Rooms {
		membership := room.GetMembershipState(app.Client.UserID)
		if app.roomMeets(rid, mask) {
			for _, s := range ships {
				if s == membership {
					roomIDs = append(roomIDs, rid)
					break
				}
			}
		}
	}
	sort.Slice(roomIDs, func(i, j int) bool {
		return app.roomTitle(roomIDs[i]) < app.roomTitle(roomIDs[j])
	})
	return roomIDs
}

var CategoryOrder = []RoomMask{
	RoomMask{false, true, true, true},
	RoomMask{true, false, true, false},
	RoomMask{true, false, false, true},
}

var MembershipOrder = []event.Membership{
	event.MembershipInvite,
	event.MembershipJoin,
	event.MembershipKnock,
	event.MembershipBan,
	event.MembershipLeave,
}

func (app *App) RoomList() []id.RoomID {
	var s []id.RoomID
	for _, c := range CategoryOrder {
		for _, m := range MembershipOrder {
			s = append(s, app.Rooms(c, m)...)
		}
	}
	return s
}


A  => ui.go +624 -0
@@ 1,624 @@
package main

import (
	"fmt"
	"github.com/mattn/go-runewidth"
	"github.com/muesli/reflow/truncate"
	"github.com/muesli/reflow/wrap"
	"github.com/pzl/tui"
	"github.com/pzl/tui/ansi"
	"maunium.net/go/mautrix/id"
	"os"
	"path/filepath"
	"strings"
	"time"
	"unicode"
)

var colors = []ansi.BasicColor{
	ansi.Red,
	ansi.Green,
	ansi.Yellow,
	/* Blue can be hard to read */
	ansi.Magenta,
	ansi.Cyan,
	// Light Colors
	60 + ansi.Red,
	60 + ansi.Green,
	60 + ansi.Yellow,
	60 + ansi.Blue,
	60 + ansi.Magenta,
	60 + ansi.Cyan,
}

func color(uid id.UserID) ansi.BasicColor {
	n := 0
	for i, r := range uid {
		n += i * int(r)
	}
	return colors[n % len(colors)]
}

func prettyUser(uid id.UserID) string {
	return fmt.Sprintf("%s%s%s%s", ansi.Bold, color(uid), uid, ansi.Reset)
}


type StatusBar struct {
	Width func() int
	Title string
	Blink bool
	Members int
	Unseen func() (int, int, int)
}

func (sb *StatusBar) Render(a *ansi.Writer) {
	dir, pub, priv := sb.Unseen()
	unseen := fmt.Sprintf("[%d] [%d] [%d] ", dir, pub, priv)
	pad := strings.Repeat(" ", max(0, sb.Width() - runewidth.StringWidth(unseen)))
	fmt.Printf("%s%s%s", ansi.Reverse, pad + unseen, ansi.Reset)
	a.Column(0)
	title := truncate.StringWithTail(sb.Title, 30, "...")
	if sb.Blink {
		fmt.Print(ansi.Blink, " " + title + " ", ansi.Reset)
	} else {
		fmt.Print(" " + title + " ")
	}
	if sb.Members == 0 {
		fmt.Print("\n")
	} else if sb.Members == 1 {
		fmt.Println(ansi.Reverse, "1 Member", ansi.Reset)
	} else if sb.Members > 1 {
		fmt.Printf("%s %d Members%s\n", ansi.Reverse, sb.Members, ansi.Reset)
	}
}


type Notice struct {
	Width func() int
	Color ansi.BasicColor
	Text string
}

func (n *Notice) Render(a *ansi.Writer) {
	if n.Text == "" {
		fmt.Print("\n")
	} else {
		t := truncate.StringWithTail(" " + n.Text, uint(n.Width()), "...")
		pad := strings.Repeat(" ", n.Width() - len(t))
		fmt.Printf("%s%s%s%s\n", n.Color, ansi.Reverse, t + pad, ansi.Reset)
	}
}


type Entry interface {
	Entry() string
}

type entry string

func (e entry) Entry() string {
	return string(e)
}

func (e entry) String() string {
	return string(e)
}

type Feed struct {
	Width func() int
	Height func() int
	Entries []Entry
	Index int  // the entry at the top
}

const GapBelowFeed = 3

func (f *Feed) scrollLimit() int {
	i := len(f.Entries) - 1
	n := 0
	for i >= 0 && n < f.Height() - GapBelowFeed {
		n += 1 + strings.Count(wrap.String(f.Entries[i].Entry(), f.Width()), "\n")
		i--
	}
	return i + 1
}

func (f *Feed) ScrollDown(n int) {
	for i := f.Index; i < len(f.Entries); i++ {
		if n <= 0 {
			break
		}
		n -= strings.Count(wrap.String(f.Entries[i].Entry(), f.Width()), "\n") + 1
		f.Index++
	}
	f.Index = min(f.scrollLimit(), f.Index)
}

func (f *Feed) ScrollUp(n int) {
	for i := f.Index; i > 0; i-- {
		if n <= 0 {
			return
		}
		n -= strings.Count(wrap.String(f.Entries[i].Entry(), f.Width()), "\n") + 1
		f.Index--
	}
}

func (f *Feed) Render(a *ansi.Writer) {
	var i, j int
	func() {
		for ; f.Index + i < len(f.Entries); i++ {
			entry := f.Entries[f.Index + i]
			for _, line := range strings.Split(wrap.String(entry.Entry(), f.Width()), "\n") {
				if j >= f.Height() {
					return
				}
				a.Column(0)
				a.ClearLineRight()
				fmt.Println(line)
				j++
			}
		}
	}()
	for ; j < f.Height(); j++ {
		a.Column(0)
		a.ClearLineRight()
		fmt.Print("\n")
	}
}


func tabComplete(s string, possibilities []string) (string, bool) {
	if len(s) == 0 {
		return "", false
	}
	var c string
	for _, p := range possibilities {
		if strings.HasPrefix(p, s) {
			if len(c) == 0 {
				c = p
			} else {
				var sb strings.Builder
				for i := 0; i < min(len(c), len(p)); i++ {
					if []rune(c)[i] != []rune(p)[i] {
						break
					}
					sb.WriteRune([]rune(c)[i])
				}
				c = sb.String()
			}
		}
	}
	if len(c) == 0 || c == s {
		return s, false
	}
	return c, true
}

func entries(dirpath string) []string {
	dir, _ := os.ReadDir(dirpath)
	names := make([]string, len(dir))
	for i := range dir {
		names[i] = dir[i].Name()
		if dir[i].IsDir() {
			names[i] += string(os.PathSeparator)
		}
	}
	return names
}

func (app *App) tabComplete(s string) string {
	s = strings_TrimLeftSpace(s)
	f := func(r rune) bool { return !unicode.IsLetter(r) }
	if i := strings.IndexFunc(s, f); i == -1 {
		fellthrough := false
		if app.Screen != RoomsScreen {
			s, fellthrough = tabComplete(s, inRoomCommands)
			fellthrough = !fellthrough
		}
		if app.Screen == RoomsScreen || fellthrough {
			s, _ = tabComplete(s, roomsScreenOrInRoomCommands)
		}
	} else {
		if j := strings.LastIndexAny(s, " @!#"); j != -1 && s[j] != ' ' {
			var from []string
			if s[j] == '@' {
				// User
				var uids []id.UserID
				if s[:i] == "invite" {
					uids = app.friends()
				} else if app.Screen != RoomsScreen {
					if s[:i] == "kick" {
						uids = roomOtherMembers(app.Client, app.RoomID)
					} else if s[:i] == "unban" {
						uids = roomOtherUsersBanned(app.Client, app.RoomID)
					} else {
						uids = roomOtherUsers(app.Client, app.RoomID)
					}
				}
				from = make([]string, len(uids))
				for i := range uids {
					from[i] = string(uids[i])
				}
			} else if s[j] == '!' {
				// Room ID
				rids := app.RoomList()
				from = make([]string, len(rids))
				for i := range rids {
					from[i] = string(rids[i])
				}
			} else {
				// Room Alias
				for _, rid := range app.RoomList() {
					from = append(from, string(roomAlias(app.Client, rid)))
					for _, a := range roomAltAliases(app.Client, rid) {
						from = append(from, string(a))
					}
				}
			}
			c, _ := tabComplete(s[j:], from)
			s = s[:j] + c
		}
		if left, right, _ := strings.Cut(s, " "); len(right) > 0 {
			// Filepath
			dir, base := filepath.Split(right)
			var names []string
			if dir == "" {
				names = entries(".")
			} else {
				names = entries(expandPath(dir))
			}
			if len(names) == 1 {
				if strings.HasPrefix(names[0], base) {
					s = left + " " + dir + names[0]
				}
			} else {
				base, _ := tabComplete(base, names)
				s = left + " " + dir + base
			}
		}
	}
	return s
}

type CommandLine struct {
	Width func() int
	Text string
	Index int  // the cursor position
	Offset int  // the visual shift for long lines
	History []string
	HistoryIndex int
	Search string
	TabComplete func(string) string
}

func (cl *CommandLine) offsetRight() bool {
	if cl.Index - cl.Offset > cl.Width() - 2 {
		cl.Offset = min(cl.Offset + 1, len(cl.Text) - cl.Width() + 2)
		return true
	}
	return false
}

func (cl *CommandLine) PositionCursor(a *ansi.Writer) {
	a.Column(cl.Index + 2 - cl.Offset)
}

func (cl *CommandLine) CursorLeft(a *ansi.Writer, n int) {
	if cl.Index == cl.Offset {
		cl.Offset = max(0, cl.Offset - n)
		cl.Render(a)
	}
	cl.Index = max(0, cl.Index - n)
	cl.PositionCursor(a)
}

func (cl *CommandLine) CursorRight(a *ansi.Writer, n int) {
	cl.Index = min(len(cl.Text), cl.Index + n)
	if cl.offsetRight() {
		cl.Render(a)
	}
	cl.PositionCursor(a)
}

func (cl *CommandLine) tillFuncLeft(f func(rune,rune) bool) int {
	if cl.Index == 0 {
		return 0
	}
	n := 1
	t := []rune(cl.Text)
	for {
		i := cl.Index - n
		if i == 0 || f(t[i - 1], t[i]) {
			return n
		}
		n++
	}
}

func (cl *CommandLine) tillFuncRight(f func(rune,rune) bool) int {
	if cl.Index == len(cl.Text) {
		return 0
	}
	n := 1
	t := []rune(cl.Text)
	for {
		i := cl.Index + n
		if i == len(cl.Text) || f(t[i - 1], t[i]) {
			return n
		}
		n++
	}
}

func isAlnum(r rune) bool {
	return unicode.In(r, unicode.Letter, unicode.Digit)
}

func isWordStart(a, b rune) bool {
	return !isAlnum(a) && isAlnum(b)
}

func (cl *CommandLine) CursorLeftWord(a *ansi.Writer) {
	cl.CursorLeft(a, cl.tillFuncLeft(isWordStart))
}

func (cl *CommandLine) CursorRightWord(a *ansi.Writer) {
	cl.CursorRight(a, cl.tillFuncRight(isWordStart))
}

func (cl *CommandLine) DeleteLeft(a *ansi.Writer, n int) {
	if cl.Index == cl.Offset {
		cl.Offset = max(0, cl.Offset - n)
	}
	n = min(cl.Index, n)
	if n != 0 {
		cl.Text = cl.Text[:cl.Index - n] + cl.Text[cl.Index:]
		cl.Index = max(0, cl.Index - n)
		cl.Render(a)
	}
}

func (cl *CommandLine) DeleteRight(a *ansi.Writer, n int) {
	if cl.Index != len(cl.Text) {
		cl.Text = cl.Text[:cl.Index] + cl.Text[cl.Index + 1:]
		cl.Render(a)
	}
}

func (cl *CommandLine) DeleteWord(a *ansi.Writer) {
	cl.DeleteLeft(a, cl.tillFuncLeft(isWordStart))
}

func (cl *CommandLine) UpHistory() {
	for cl.HistoryIndex < len(cl.History) {
		h := cl.History[len(cl.History) - cl.HistoryIndex - 1]
		cl.HistoryIndex++
		if len(cl.Search) == 0 || (strings.HasPrefix(h, cl.Search) && h != cl.Search) {
			cl.Text = h
			cl.Index = len(h)
			cl.offsetRight()
			return
		}
	}
}

func (cl *CommandLine) DownHistory() {
	if cl.HistoryIndex == 1 {
		cl.HistoryIndex = 0
		cl.Text = cl.Search
		cl.Index = len(cl.Search)
		cl.offsetRight()
		return
	}
	for cl.HistoryIndex > 0 {
		cl.HistoryIndex--
		h := cl.History[len(cl.History) - cl.HistoryIndex]
		if len(cl.Text) == 0 || (strings.HasPrefix(h, cl.Search) && h != cl.Search) {
			cl.Text = h
			cl.Index = len(h)
			cl.offsetRight()
			return
		}
	}
}

func (cl *CommandLine) Clear(a *ansi.Writer) {
	cl.Text = ""
	cl.Index = 0
	cl.Offset = 0
	a.Column(2)
	a.ClearLineRight()
}

func (cl *CommandLine) Accept(a *ansi.Writer) {
	if len(cl.History) == 0 || cl.Text != cl.History[len(cl.History)-1] {
		if len(cl.Text) > 0 {
			cl.History = append(cl.History, cl.Text)
		}
	}
	cl.HistoryIndex = 0
	cl.Search = ""
	cl.Clear(a)
}

func (cl *CommandLine) Reject(a *ansi.Writer) {
	fmt.Print(ansi.Red)
	cl.Render(a)
	fmt.Print(ansi.Reset)
	time.Sleep(100 * time.Millisecond)
	cl.Render(a)
}

func (cl *CommandLine) Render(a *ansi.Writer) {
	if cl.Width() == 0 {
		return
	}
	a.Column(0)
	a.ClearLineRight()
	fmt.Print(":")
	fmt.Print(cl.Text[cl.Offset:min(cl.Offset + cl.Width()-1, len(cl.Text))])
	cl.PositionCursor(a)
}

func (cl *CommandLine) Handle(ev tui.Event, a *ansi.Writer) bool {
	switch ev.Type {
	case tui.KeyPrint:
		cl.Text = cl.Text[:cl.Index] + string(ev.Key) + cl.Text[cl.Index:]
		cl.Index++
		cl.offsetRight()
		cl.Render(a)
	case tui.KeySpecial:
		switch ev.Key {
		case tui.CtrlM:  // Enter
			return true
		case tui.ESC, tui.CtrlC:
			cl.Clear(a)
		case tui.BSpace:
			cl.DeleteLeft(a, 1)
		case tui.CtrlH, tui.CtrlW:  // CtrlH = Ctrl+Backspace
			cl.DeleteWord(a)
		case tui.Del:
			cl.DeleteRight(a, 1)
		case tui.Tab:
			// completion, _ := tabComplete(cl.Text[:cl.Index], commands)
			completion := cl.TabComplete(cl.Text[:cl.Index])
			cl.Text = completion + cl.Text[cl.Index:]
			cl.Index = len(completion)
			cl.offsetRight()
			cl.Render(a)
		case tui.Up:
			cl.UpHistory()
			cl.Render(a)
		case tui.Down:
			cl.DownHistory()
			cl.Render(a)
		case tui.Left:
			cl.CursorLeft(a, 1)
		case tui.Right:
			cl.CursorRight(a, 1)
		case tui.CtrlLeft:
			cl.CursorLeftWord(a)
		case tui.CtrlRight:
			cl.CursorRightWord(a)
		case tui.Home, tui.CtrlB:
			cl.Index = 0
			cl.Offset = 0
			cl.Render(a)
		case tui.End, tui.CtrlE:
			cl.Index = len(cl.Text)
			cl.offsetRight()
			cl.Render(a)
		}
	}
	if ev.Type == tui.KeyPrint || (ev.Key != tui.Up && ev.Key != tui.Down) {
		cl.Search = cl.Text[:cl.Index]
	}
	return false
}


type UI struct {
	Ansi *ansi.Writer
	Width int
	Height int
	StatusBar StatusBar
	Feed Feed
	CommandLine CommandLine
	Notice Notice
}

func NewUI(unseen func() (int,int,int), tabComplete func(string) string) *UI {
	ui := &UI{Ansi: ansi.NewWriter(os.Stdout)}
	ui.StatusBar.Unseen = unseen
	ui.StatusBar.Width = func() int { return ui.Width }
	ui.Feed.Width = func() int { return ui.Width }
	ui.Feed.Height = func() int { return ui.Height - 2 }
	ui.CommandLine.Width = func() int { return ui.Width }
	ui.CommandLine.TabComplete = tabComplete
	ui.Notice.Width = func() int { return ui.Width }
	return ui
}

func (ui *UI) Scroll(n int) {
	if n >= 0 {
		ui.Feed.ScrollDown(n)
	} else {
		ui.Feed.ScrollUp(-n)
	}
	ui.Render()
}

func (ui *UI) Notify(col ansi.BasicColor, text string) {
	ui.Notice.Color = col
	ui.Notice.Text = text
	ui.Ansi.MoveTo(0, ui.Height - 1)
	ui.Notice.Render(ui.Ansi)
	ui.CommandLine.PositionCursor(ui.Ansi)
}

func (ui *UI) Accept() {
	ui.CommandLine.Accept(ui.Ansi)
	ui.Notice.Text = ""
	ui.Render()
}

func (ui *UI) Reject() {
	ui.CommandLine.Reject(ui.Ansi)
	ui.Notice.Text = ""
	ui.Render()
}

func (ui *UI) Resize(width, height int) {
	ui.Width, ui.Height = width, height
}

func (ui *UI) Render() {
	ui.Ansi.CursorHide()
	defer ui.Ansi.CursorShow()
	ui.Ansi.Origin()
	ui.StatusBar.Render(ui.Ansi)
	ui.Feed.Render(ui.Ansi)
	ui.Ansi.Up(1)
	ui.Notice.Render(ui.Ansi)
	ui.CommandLine.Render(ui.Ansi)
	ui.CommandLine.PositionCursor(ui.Ansi)
}

func (ui *UI) RenderStatusBar() {
	ui.Ansi.Origin()
	ui.StatusBar.Render(ui.Ansi)
	ui.Ansi.Down(ui.Feed.Height())
	ui.CommandLine.PositionCursor(ui.Ansi)
}

func (ui *UI) Handle(ev tui.Event) (string, bool) {
	switch ev.Type {
	case tui.KeyPrint:
		ui.CommandLine.Handle(ev, ui.Ansi)
	case tui.KeySpecial:
		switch ev.Key {
		case tui.CtrlL:
			ui.Notice.Text = ""
			ui.Render()
		case tui.CtrlJ:
			ui.Scroll(1)
		case tui.CtrlK:
			ui.Scroll(-1)
		case tui.CtrlD:
			ui.Scroll(ui.Feed.Height() / 2)
		case tui.CtrlU:
			ui.Scroll(-ui.Feed.Height() / 2)
		case tui.PgDn:
			ui.Scroll(ui.Feed.Height())
		case tui.PgUp:
			ui.Scroll(-ui.Feed.Height())
		default:
			if ui.CommandLine.Handle(ev, ui.Ansi) {
				return ui.CommandLine.Text, true
			}
		}
	}
	return "", false
}