Display prefixes in member list

Closes: https://todo.sr.ht/~emersion/gamja/43

components/app.js

@@ -683,6 +683,7 @@ export default class App extends Component {
 			if (this.isChannel(target)) {
 				this.addMessage(netID, target, msg);
 			}
+			this.handleMode(netID, msg);
 			break;
 		case "NOTICE":
 		case "PRIVMSG":
@@ -1218,6 +1219,89 @@ export default class App extends Component {
 		this.setState({ dialog: null, networkDialog: null });
 	}
 
+	handleMode(netID, msg) {
+		var client = this.clients.get(netID);
+		var chanmodes = client.isupport.get("CHANMODES") || irc.STD_CHANMODES;
+		var prefix = client.isupport.get("PREFIX") || "";
+
+		var prefixByMode = new Map(irc.parseMemberships(prefix).map((membership) => {
+			return [membership.mode, membership.prefix];
+		}));
+
+		var typeByMode = new Map();
+		var [a, b, c, d] = chanmodes.split(",");
+		Array.from(a).forEach((mode) => typeByMode.set(mode, "A"));
+		Array.from(b).forEach((mode) => typeByMode.set(mode, "B"));
+		Array.from(c).forEach((mode) => typeByMode.set(mode, "C"));
+		Array.from(d).forEach((mode) => typeByMode.set(mode, "D"));
+		prefixByMode.forEach((prefix, mode) => typeByMode.set(mode, "B"));
+
+		var channel = msg.params[0];
+		var change = msg.params[1];
+		var args = msg.params.slice(2);
+
+		var plusMinus = null;
+		var j = 0;
+		for (var i = 0; i < change.length; i++) {
+			if (change[i] === "+" || change[i] === "-") {
+				plusMinus = change[i];
+				continue;
+			}
+			if (!plusMinus) {
+				throw new Error("malformed mode string: missing plus/minus");
+			}
+
+			var mode = change[i];
+			var add = plusMinus === "+";
+
+			var modeType = typeByMode.get(mode);
+			if (!modeType) {
+				continue;
+			}
+
+			var arg = null;
+			if (modeType === "A" || modeType === "B" || (modeType === "C" && add)) {
+				arg = args[j];
+				j++;
+			}
+
+			if (prefixByMode.has(mode)) {
+				this.handlePrefixChange(netID, channel, arg, prefixByMode.get(mode), add);
+			}
+
+			// XXX: If we eventually want to handle any mode changes with
+			// some special logic, this would be the place to. Not sure
+			// what we'd want to do in that regard, though.
+		}
+	}
+
+	handlePrefixChange(netID, channel, nick, letter, add) {
+		var client = this.clients.get(netID);
+		var prefix = client.isupport.get("PREFIX") || "";
+
+		var prefixPrivs = new Map(irc.parseMemberships(prefix).map((membership, i) => {
+			return [membership.prefix, i];
+		}));
+
+		this.setBufferState({ network: netID, name: channel }, (buf) => {
+			var members = new irc.CaseMapMap(buf.members);
+			var membership = members.get(nick);
+			if (add) {
+				var i = membership.indexOf(letter);
+				if (i < 0) {
+					membership += letter;
+				}
+			} else {
+				membership = membership.replace(letter, "");
+			}
+			membership = Array.from(membership).sort((a, b) => {
+				return prefixPrivs.get(a) - prefixPrivs.get(b);
+			}).join("");
+			members.set(nick, membership);
+			return { members };
+		});
+	}
+
 	componentDidMount() {
 		setupKeybindings(this);
 	}

components/member-list.js

@@ -9,7 +9,8 @@ class MemberItem extends Component {
 	}
 
 	shouldComponentUpdate(nextProps) {
-		return this.props.nick !== nextProps.nick;
+		return this.props.nick !== nextProps.nick
+			|| this.props.membership != nextProps.membership;
 	}
 
 	handleClick(event) {
@@ -18,14 +19,54 @@ class MemberItem extends Component {
 	}
 
 	render() {
+		// XXX: If we were feeling creative we could generate unique colors for
+		// each item in ISUPPORT CHANMODES. But I am not feeling creative.
+		const membmap = {
+			"~": "owner",
+			"&": "admin",
+			"@": "op",
+			"%": "halfop",
+			"+": "voice",
+		};
+		const membclass = membmap[this.props.membership[0]] || "";
+		let membership = "";
+		if (this.props.membership) {
+			membership = html`
+				<span class="membership ${membclass}" title=${membclass}>
+					${this.props.membership}
+				</span>
+			`;
+		};
 		return html`
 			<li>
-				<a href=${getNickURL(this.props.nick)} class="nick" onClick=${this.handleClick}>${this.props.nick}</a>
+				<a
+					href=${getNickURL(this.props.nick)}
+					class="nick"
+					onClick=${this.handleClick}
+				>${membership}${this.props.nick}</a>
 			</li>
 		`;
 	}
 }
 
+function sortMembers(a, b) {
+	var [nickA, membA] = a, [nickB, membB] = b;
+
+	const prefixPrivs = ["~", "&", "@", "%", "+"]; // TODO: grab it from ISUPPORT PREFIX
+	var i = prefixPrivs.indexOf(membA[0]), j = prefixPrivs.indexOf(membB[0]);
+	if (i < 0) {
+		i = prefixPrivs.length;
+	}
+	if (j < 0) {
+		j = prefixPrivs.length;
+	}
+	if (i !== j) {
+		return i - j;
+	}
+
+	return nickA < nickB ? -1 : 1;
+}
+
 export default class MemberList extends Component {
 	shouldComponentUpdate(nextProps) {
 		return this.props.members !== nextProps.members;
@@ -34,8 +75,13 @@ export default class MemberList extends Component {
 	render() {
 		return html`
 			<ul>
-				${Array.from(this.props.members).sort().map(([nick, membership]) => html`
-					<${MemberItem} key=${nick} nick=${nick} membership=${membership} onClick=${() => this.props.onNickClick(nick)}/>
+				${Array.from(this.props.members).sort(sortMembers).map(([nick, membership]) => html`
+					<${MemberItem}
+						key=${nick}
+						nick=${nick}
+						membership=${membership}
+						onClick=${() => this.props.onNickClick(nick)}
+					/>
 				`)}
 			</ul>
 		`;

lib/irc.js

@@ -41,6 +41,7 @@ export const ERR_SASLABORTED = "906";
 export const ERR_SASLALREADY = "907";
 
 export const STD_CHANNEL_TYPES = "#&+!";
+export const STD_CHANMODES = "beI,k,l,imnst";
 
 const tagEscapeMap = {
 	";": "\\:",
@@ -510,3 +511,23 @@ export class CaseMapMap {
 		return this.entries();
 	}
 }
+
+export function parseMemberships(str) {
+	if (str[0] !== "(") {
+		throw new Error("malformed ISUPPORT PREFIX value: expected opening parenthesis");
+	}
+
+	var sep = str.indexOf(")");
+	if (sep < 0) {
+		throw new Error("malformed ISUPPORT PREFIX value: expected closing parenthesis");
+	}
+
+	var n = str.length - sep - 1;
+	var memberships = [];
+	for (var i = 0; i < n; i++) {
+		var mode = str[i + 1];
+		var prefix = str[sep + i + 1];
+		memberships.push({ mode, prefix });
+	}
+	return memberships;
+}

style.css

@@ -261,6 +261,22 @@ button.danger:hover {
 	box-sizing: border-box;
 }
 
+.membership.owner {
+	color: red;
+}
+.membership.admin {
+	color: blue;
+}
+.membership.op {
+	color: var(--green);
+}
+.membership.halfop {
+	color: orange;
+}
+.membership.voice {
+	color: yellow;
+}
+
 #composer {
 	color: var(--main-color);
 	background: var(--main-background);