xC/xP: send buffer input history during sync

This transfer is currenly quite simplistic,
but it paves the way for further extensions.

xC.c

@@ -231,6 +231,8 @@ struct input_vtable
 	void (*buffer_destroy) (void *input, input_buffer_t buffer);
 	/// Switch to a different input buffer
 	void (*buffer_switch) (void *input, input_buffer_t buffer);
+	/// Return all history lines in the locale encoding
+	struct strv (*buffer_history) (void *input, input_buffer_t buffer);
 
 	/// Register a function that can be bound to character sequences
 	void (*register_fn) (void *input,
@@ -258,7 +260,7 @@ struct input_vtable
 #define INPUT_VTABLE(XX)                                                       \
 	XX (start) XX (stop) XX (prepare) XX (destroy)                             \
 	XX (hide) XX (show) XX (get_prompt) XX (set_prompt) XX (ding)              \
-	XX (buffer_new) XX (buffer_destroy) XX (buffer_switch)                     \
+	XX (buffer_new) XX (buffer_destroy) XX (buffer_switch) XX (buffer_history) \
 	XX (register_fn) XX (bind) XX (bind_control) XX (bind_meta)                \
 	XX (get_line) XX (clear_line) XX (insert)                                  \
 	XX (on_tty_resized) XX (on_tty_readable)
@@ -584,6 +586,19 @@ input_rl_buffer_switch (void *input, input_buffer_t input_buffer)
 	self->current = buffer;
 }
 
+static struct strv
+input_rl_buffer_history (void *input, input_buffer_t input_buffer)
+{
+	struct input_rl *self = input;
+	struct input_rl_buffer *buffer = input_buffer;
+	HIST_ENTRY **p =
+		buffer->history ? buffer->history->entries : history_list();
+	struct strv v = strv_make ();
+	while (p && *p)
+		strv_append (&v, (*p++)->line);
+	return v;
+}
+
 static void
 input_rl__buffer_destroy_wo_history (struct input_rl_buffer *self)
 {
@@ -1059,6 +1074,30 @@ input_el_buffer_switch (void *input, input_buffer_t input_buffer)
 	input_el__restore_buffer (self, buffer);
 }
 
+static struct strv
+input_el_buffer_history (void *input, input_buffer_t input_buffer)
+{
+	struct input_el *self = input;
+	struct input_el_buffer *buffer = input_buffer;
+	struct strv v = strv_make ();
+	HistEventW ev;
+	if (history_w (buffer->history, &ev, H_LAST) < 0)
+		return v;
+
+	do
+	{
+		size_t len = wcstombs (NULL, ev.str, 0);
+		if (len++ == (size_t) -1)
+			continue;
+
+		char *mb = xmalloc (len);
+		mb[wcstombs (mb, ev.str, len)] = 0;
+		strv_append_owned (&v, mb);
+	}
+	while (history_w (buffer->history, &ev, H_PREV) >= 0);
+	return v;
+}
+
 static void
 input_el_buffer_destroy (void *input, input_buffer_t input_buffer)
 {
@@ -3092,6 +3131,20 @@ relay_prepare_buffer_activate (struct app_context *ctx, struct buffer *buffer)
 	e->buffer_name = str_from_cstr (buffer->name);
 }
 
+static void
+relay_prepare_buffer_input (struct app_context *ctx, struct buffer *buffer,
+	const char *locale_input)
+{
+	struct relay_event_message *m = relay_prepare (ctx);
+	struct relay_event_data_buffer_input *e = &m->data.buffer_input;
+	e->event = RELAY_EVENT_BUFFER_INPUT;
+	e->buffer_name = str_from_cstr (buffer->name);
+	char *input = iconv_xstrdup (ctx->term_to_utf8,
+		(char *) locale_input, -1, NULL);
+	e->text = str_from_cstr (input);
+	free (input);
+}
+
 static void
 relay_prepare_buffer_clear (struct app_context *ctx,
 	struct buffer *buffer)
@@ -15307,6 +15360,19 @@ init_poller_events (struct app_context *ctx)
 
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 
+static void
+client_resync_buffer_input (struct client *c, struct buffer *buffer)
+{
+	struct strv history =
+		CALL_ (c->ctx->input, buffer_history, buffer->input_data);
+	for (size_t i = 0; i < history.len; i++)
+	{
+		relay_prepare_buffer_input (c->ctx, buffer, history.vector[i]);
+		relay_send (c);
+	}
+	strv_free (&history);
+}
+
 static void
 client_resync (struct client *c)
 {
@@ -15325,6 +15391,8 @@ client_resync (struct client *c)
 		relay_prepare_buffer_stats (c->ctx, buffer);
 		relay_send (c);
 
+		client_resync_buffer_input (c, buffer);
+
 		LIST_FOR_EACH (struct buffer_line, line, buffer->lines)
 		{
 			relay_prepare_buffer_line (c->ctx, buffer, line, false);

xC.lxdr

@@ -59,6 +59,7 @@ struct EventMessage {
 		BUFFER_RENAME,
 		BUFFER_REMOVE,
 		BUFFER_ACTIVATE,
+		BUFFER_INPUT,
 		BUFFER_CLEAR,
 		SERVER_UPDATE,
 		SERVER_RENAME,
@@ -153,6 +154,9 @@ struct EventMessage {
 		string buffer_name;
 	case BUFFER_ACTIVATE:
 		string buffer_name;
+	case BUFFER_INPUT:
+		string buffer_name;
+		string text;
 	case BUFFER_CLEAR:
 		string buffer_name;
 

xP/public/xP.js

@@ -387,6 +387,15 @@ rpcEventHandlers.set(Relay.Event.BufferActivate, e => {
 	}
 })
 
+rpcEventHandlers.set(Relay.Event.BufferInput, e => {
+	let b = buffers.get(e.bufferName)
+	if (b === undefined)
+		return
+	if (b.historyAt == b.history.length)
+		b.historyAt++
+	b.history.push(e.text)
+})
+
 rpcEventHandlers.set(Relay.Event.BufferClear, e => {
 	let b = buffers.get(e.bufferName)
 	if (b !== undefined)