xP: clean up

For there is otherwise no way of getting that information.

xC.c

@@ -2868,6 +2868,7 @@ relay_try_fetch_client (struct app_context *ctx, int listen_fd)
 		if (accept_error_is_transient (errno))
 			print_warning ("%s: %s", "accept", strerror (errno));
 		else
+			// TODO: Rather dispose of the listening socket.
 			print_fatal ("%s: %s", "accept", strerror (errno));
 		return true;
 	}
@@ -12053,6 +12054,23 @@ handle_command_plugin (struct handler_args *a)
 	return true;
 }
 
+static bool
+handle_command_relay (struct handler_args *a)
+{
+	if (*a->arguments)
+		return false;
+
+	int len = 0;
+	LIST_FOR_EACH (struct client, c, a->ctx->clients)
+		len++;
+
+	if (a->ctx->relay_fd == -1)
+		log_global_status (a->ctx, "The relay is not enabled");
+	else
+		log_global_status (a->ctx, "The relay has #d clients", len);
+	return true;
+}
+
 static bool
 show_aliases_list (struct app_context *ctx)
 {
@@ -12789,6 +12807,9 @@ g_command_handlers[] =
 	{ "plugin",     "Manage plugins",
 	  "list | load <name> | unload <name>",
 	  handle_command_plugin,     0 },
+	{ "relay",      "Show relay information",
+	  NULL,
+	  handle_command_relay,      0 },
 
 	{ "alias",      "List or set aliases",
 	  "[<name> <definition>]",
@@ -13887,22 +13908,27 @@ build_editor_command (struct app_context *ctx, const char *filename)
 		{
 		case 'F':
 			str_append (&argument, filename);
-			break;
+			continue;
 		case 'L':
 			str_append_printf (&argument, "%zu", line_one_based);
-			break;
+			continue;
 		case 'C':
 			str_append_printf (&argument, "%zu", column + 1);
-			break;
+			continue;
 		case 'B':
 			str_append_printf (&argument, "%d",  cursor + 1);
-			break;
+			continue;
 		case '%':
 		case ' ':
 			str_append_c (&argument, *editor);
-			break;
-		default:
-			print_warning ("unknown substitution variable");
+			continue;
+		}
+
+		const char *p = editor;
+		if (soft_assert (utf8_decode (&p, strlen (p)) > 0))
+		{
+			log_global_error (ctx, "Unknown substitution variable: %#&s",
+				xstrndup (editor, p - editor));
 		}
 	}
 	if (argument.len)
@@ -14755,7 +14781,8 @@ try_reap_child (struct app_context *ctx)
 	if (WIFSTOPPED (status))
 	{
 		// We could also send SIGCONT but what's the point
-		print_debug ("a child has been stopped, killing its process group");
+		log_global_debug (ctx,
+			"A child has been stopped, killing its process group");
 		kill (-zombie, SIGKILL);
 		return true;
 	}
@@ -15253,7 +15280,7 @@ client_process_message (struct client *c,
 	if (!relay_command_message_deserialize (m, r)
 	 || msg_unpacker_get_available (r))
 	{
-		print_error ("deserialization failed, killing client");
+		log_global_error (c->ctx, "Deserialization failed, killing client");
 		return false;
 	}
 
@@ -15272,7 +15299,8 @@ client_process_message (struct client *c,
 		if (m->data.hello.version != RELAY_VERSION)
 		{
 			// TODO: This should send back an error message and shut down.
-			print_error ("protocol version mismatch, killing client");
+			log_global_error (c->ctx,
+				"Protocol version mismatch, killing client");
 			return false;
 		}
 		c->initialized = true;
@@ -15300,7 +15328,7 @@ client_process_message (struct client *c,
 		client_process_buffer_log (c, m->command_seq, buffer);
 		break;
 	default:
-		print_warning ("unhandled client command");
+		log_global_debug (c->ctx, "Unhandled client command");
 		relay_prepare_error (c->ctx, m->command_seq, "Unknown command");
 		relay_send (c);
 	}

xP/public/xP.css

@@ -16,6 +16,10 @@ body {
 	border-bottom: 1px solid #ccc;
 	padding: .05rem .3rem;
 }
+.title {
+	display: flex;
+	justify-content: space-between;
+}
 
 .middle {
 	flex: auto;
@@ -52,6 +56,12 @@ body {
 	grid-template-columns: max-content auto;
 	overflow-y: auto;
 }
+.log {
+	padding: .1rem .3rem;
+	font-family: monospace;
+	white-space: pre-wrap;
+	overflow-y: auto;
+}
 
 .date {
 	padding: .3rem;

xP/public/xP.js

@@ -118,6 +118,11 @@ class RelayRpc extends EventTarget {
 			this.promised[seq] = {resolve, reject}
 		})
 	}
+
+	base64decode(str) {
+		return decodeURIComponent(atob(str).split('').map(c =>
+			'%' + ('00' + c.charCodeAt(0).toString(16)).slice(-2)).join(''))
+	}
 }
 
 // ---- Event processing -------------------------------------------------------
@@ -126,10 +131,16 @@ let rpc = new RelayRpc(proxy)
 
 let buffers = new Map()
 let bufferCurrent = undefined
+let bufferLog = undefined
+let bufferAutoscroll = true
+
 let connecting = true
 rpc.connect().then(result => {
 	buffers.clear()
 	bufferCurrent = undefined
+	bufferLog = undefined
+	bufferAutoscroll = true
+
 	rpc.send({command: 'Hello', version: 1})
 	connecting = false
 	m.redraw()
@@ -163,13 +174,24 @@ rpc.addEventListener('BufferRemove', event => {
 })
 
 rpc.addEventListener('BufferActivate', event => {
-	let e = event.detail
+	let e = event.detail, b = buffers.get(e.bufferName)
+	let old = buffers.get(bufferCurrent)
 	bufferCurrent = e.bufferName
-	setTimeout(() => {
-		let el = document.getElementById('input')
-		if (el !== null)
-			el.focus()
-	})
+	bufferLog = undefined
+	bufferAutoscroll = true
+
+	let textarea = document.getElementById('input')
+	if (textarea === null)
+		return
+
+	textarea.focus()
+	if (old !== undefined)
+		old.input = textarea.value
+
+	if (b !== undefined)
+		textarea.value = b.input || ''
+	else
+		textarea.value = ''
 })
 
 rpc.addEventListener('BufferLine', event => {
@@ -204,67 +226,97 @@ for (let i = 0; i < 24; i++) {
 	palette[232 + i] = `#${g}${g}${g}`
 }
 
-function applyColor(fg, bg, inverse) {
-	if (inverse)
-		[fg, bg] = [bg >= 0 ? bg : 15, fg >= 0 ? fg : 0]
-
-	let style = {}
-	if (fg >= 0)
-		style.color = palette[fg]
-	if (bg >= 0)
-		style.backgroundColor = palette[bg]
-	if (style)
-		return style
-}
-
 // ---- UI ---------------------------------------------------------------------
 
-let BufferList = {
+let Toolbar = {
+	toggleAutoscroll: () => {
+		bufferAutoscroll = !bufferAutoscroll
+	},
+
+	toggleLog: () => {
+		if (bufferLog) {
+			bufferLog = undefined
+			return
+		}
+
+		rpc.send({
+			command: 'BufferLog',
+			bufferName: bufferCurrent,
+		}).then(resp => {
+			bufferLog = rpc.base64decode(resp.log)
+			m.redraw()
+		})
+	},
+
 	view: vnode => {
-		let items = []
-		buffers.forEach((b, name) => {
-			let attrs = {
-				onclick: event => {
-					rpc.send({command: 'BufferActivate', bufferName: name})
-				},
-			}
+		return m('.toolbar', {}, [
+			m('button', {onclick: Toolbar.toggleAutoscroll},
+				bufferAutoscroll ? 'Pause autoscroll' : 'Unpause autoscroll'),
+			m('button', {onclick: Toolbar.toggleLog},
+				bufferLog === undefined ? 'Show log' : 'Hide log'),
+		])
+	},
+}
+
+let BufferList = {
+	activate: name => {
+		rpc.send({command: 'BufferActivate', bufferName: name})
+	},
+
+	view: vnode => {
+		let items = Array.from(buffers, ([name, b]) => {
+			let attrs = {onclick: event => BufferList.activate(name)}
 			if (name == bufferCurrent)
 				attrs.class = 'active'
-			items.push(m('.item', attrs, name))
+			return m('.item', attrs, name)
 		})
 		return m('.list', {}, items)
 	},
 }
 
-function linkify(text, attrs, a) {
-	let re = new RegExp([
-		/https?:\/\//,
-		/([^\[\](){}<>"'\s]|\([^\[\](){}<>"'\s]*\))+/,
-		/[^\[\](){}<>"'\s,.:]/,
-	].map(r => r.source).join(''), 'g')
-
-	let end = 0, match
-	while ((match = re.exec(text)) !== null) {
-		if (end < match.index)
-			a.push(m('span', attrs, text.substring(end, match.index)))
-		a.push(m('a', {href: match[0], ...attrs}, match[0]))
-		end = re.lastIndex
-	}
-	if (end < text.length)
-		a.push(m('span', attrs, text.substring(end)))
-}
-
 let Content = {
+	applyColor: (fg, bg, inverse) => {
+		if (inverse)
+			[fg, bg] = [bg >= 0 ? bg : 15, fg >= 0 ? fg : 0]
+
+		let style = {}
+		if (fg >= 0)
+			style.color = palette[fg]
+		if (bg >= 0)
+			style.backgroundColor = palette[bg]
+		if (style)
+			return style
+	},
+
+	linkify: (text, attrs) => {
+		let re = new RegExp([
+			/https?:\/\//,
+			/([^\[\](){}<>"'\s]|\([^\[\](){}<>"'\s]*\))+/,
+			/[^\[\](){}<>"'\s,.:]/,
+		].map(r => r.source).join(''), 'g')
+
+		let a = [], end = 0, match
+		while ((match = re.exec(text)) !== null) {
+			if (end < match.index)
+				a.push(m('span', attrs, text.substring(end, match.index)))
+			a.push(m('a', {href: match[0], ...attrs}, match[0]))
+			end = re.lastIndex
+		}
+		if (end < text.length)
+			a.push(m('span', attrs, text.substring(end)))
+		return a
+	},
+
 	view: vnode => {
 		let line = vnode.children[0]
-		let content = []
+		let mark = undefined
 		switch (line.rendition) {
-		case 'Indent': content.push(m('span.mark',        {}, ''));  break
-		case 'Status': content.push(m('span.mark',        {}, '–')); break
-		case 'Error':  content.push(m('span.mark.error',  {}, '⚠')); break
-		case 'Join':   content.push(m('span.mark.join',   {}, '→')); break
-		case 'Part':   content.push(m('span.mark.part',   {}, '←')); break
-		case 'Action': content.push(m('span.mark.action', {}, '✶')); break
+		case 'Indent': mark = m('span.mark',        {}, '');  break
+		case 'Status': mark = m('span.mark',        {}, '–'); break
+		case 'Error':  mark = m('span.mark.error',  {}, '⚠'); break
+		case 'Join':   mark = m('span.mark.join',   {}, '→'); break
+		case 'Part':   mark = m('span.mark.part',   {}, '←'); break
+		case 'Action': mark = m('span.mark.action', {}, '✶'); break
 		}
 
 		let classes = new Set()
@@ -275,14 +327,13 @@ let Content = {
 				classes.add(c)
 		}
 		let fg = -1, bg = -1, inverse = false
-		line.items.forEach(item => {
+		return m('.content', {}, [mark, line.items.flatMap(item => {
 			switch (item.kind) {
 			case 'Text':
-				linkify(item.text, {
+				return Content.linkify(item.text, {
 					class: Array.from(classes.keys()).join(' '),
-					style: applyColor(fg, bg, inverse),
-				}, content)
-				break
+					style: Content.applyColor(fg, bg, inverse),
+				})
 			case 'Reset':
 				classes.clear()
 				fg = bg = -1
@@ -297,25 +348,30 @@ let Content = {
 			case 'FlipInverse':
 				inverse = !inverse
 				break
-			case 'FlipBold':       flip('b'); break
-			case 'FlipItalic':     flip('i'); break
-			case 'FlipUnderline':  flip('u'); break
-			case 'FlipCrossedOut': flip('s'); break
-			case 'FlipMonospace':  flip('m'); break
+			case 'FlipBold':
+				flip('b')
+				break
+			case 'FlipItalic':
+				flip('i')
+				break
+			case 'FlipUnderline':
+				flip('u')
+				break
+			case 'FlipCrossedOut':
+				flip('s')
+				break
+			case 'FlipMonospace':
+				flip('m')
+				break
 			}
-		})
-		return m('.content', {}, content)
+		})])
 	},
 }
 
 let Buffer = {
 	oncreate: vnode => {
-		if (vnode.dom === undefined)
-			return
-
-		let el = vnode.dom.children[1]
-		if (el !== null)
-			el.scrollTop = el.scrollHeight
+		if (vnode.dom !== undefined && bufferAutoscroll)
+			vnode.dom.scrollTop = vnode.dom.scrollHeight
 	},
 
 	onupdate: vnode => {
@@ -340,62 +396,84 @@ let Buffer = {
 			lines.push(m('.time', {}, date.toLocaleTimeString()))
 			lines.push(m(Content, {}, line))
 		})
+		return m('.buffer', {}, lines)
+	},
+}
+
+let Log = {
+	oncreate: vnode => {
+		if (vnode.dom !== undefined)
+			vnode.dom.scrollTop = vnode.dom.scrollHeight
+	},
+
+	view: vnode => {
+		return m(".log", {}, bufferLog)
+	},
+}
+
+let BufferContainer = {
+	view: vnode => {
 		return m('.buffer-container', {}, [
 			m('.filler'),
-			m('.buffer', {}, lines),
+			bufferLog !== undefined ? m(Log) : m(Buffer),
 		])
 	},
 }
 
-function onKeyDown(event) {
-	// TODO: And perhaps on other actions, too.
-	rpc.send({command: 'Active'})
-
-	// TODO: Cancel any current autocomplete.
-
-	let textarea = event.currentTarget
-	switch (event.keyCode) {
-	case 9:
+let Input = {
+	complete: textarea => {
 		if (textarea.selectionStart !== textarea.selectionEnd)
-			return
+			return false
+
 		rpc.send({
 			command: 'BufferComplete',
 			bufferName: bufferCurrent,
 			text: textarea.value,
 			position: textarea.selectionEnd,
-		}).then(response => {
+		}).then(resp => {
 			// TODO: Somehow display remaining options, or cycle through.
-			if (response.completions.length)
-				textarea.setRangeText(response.completions[0],
-					response.start, textarea.selectionEnd, 'end')
-			if (response.completions.length === 1)
+			if (resp.completions.length)
+				textarea.setRangeText(resp.completions[0],
+					resp.start, textarea.selectionEnd, 'end')
+			if (resp.completions.length === 1)
 				textarea.setRangeText(' ',
 					textarea.selectionStart, textarea.selectionEnd, 'end')
 		})
-		break;
-	case 13:
+		return true
+	},
+
+	submit: textarea => {
 		rpc.send({
 			command: 'BufferInput',
 			bufferName: bufferCurrent,
 			text: textarea.value,
 		})
 		textarea.value = ''
-		break;
-	default:
-		return
-	}
+		return true
+	},
 
-	event.preventDefault()
-}
+	onKeyDown: event => {
+		// TODO: And perhaps on other actions, too.
+		rpc.send({command: 'Active'})
+
+		// TODO: Cancel any current autocomplete.
+
+		let textarea = event.currentTarget
+		let handled = false
+		switch (event.keyCode) {
+		case 9:
+			handled = Input.complete(textarea)
+			break
+		case 13:
+			handled = Input.submit(textarea)
+			break
+		}
+		if (handled)
+			event.preventDefault()
+	},
 
-// TODO: This should be remembered across buffer switches,
-// and we'll probably have to intercept /all/ key presses.
-let Input = {
 	view: vnode => {
-		return m('textarea#input', {
-			rows: 1,
-			onkeydown: onKeyDown,
-		})
+		return m('textarea#input', {rows: 1, onkeydown: Input.onKeyDown})
 	},
 }
 
@@ -408,8 +486,8 @@ let Main = {
 			state = "Disconnected"
 
 		return m('.xP', {}, [
-			m('.title', {}, `xP (${state})`),
-			m('.middle', {}, [m(BufferList), m(Buffer)]),
+			m('.title', {}, [`xP (${state})`, m(Toolbar)]),
+			m('.middle', {}, [m(BufferList), m(BufferContainer)]),
 			m('.status', {}, bufferCurrent),
 			m(Input),
 		])