Here's the latest diff.

It actually seems to work fine, although I haven't done a lot of testing.

IIRC I wasn't wild about the cmd-list-keys.c and cmd-bind-key.c changes;
certainly lsk -T should error on an unknown table, same as bind -T. I
think the manpage bits could do with some improvement too.


Index: cmd-bind-key.c
===================================================================
RCS file: /cvs/src/usr.bin/tmux/cmd-bind-key.c,v
retrieving revision 1.20
diff -u -p -r1.20 cmd-bind-key.c
--- cmd-bind-key.c      10 Apr 2015 16:00:08 -0000      1.20
+++ cmd-bind-key.c      13 Apr 2015 21:29:21 -0000
@@ -33,8 +33,8 @@ enum cmd_retval        cmd_bind_key_mode_table
 
 const struct cmd_entry cmd_bind_key_entry = {
        "bind-key", "bind",
-       "cnrt:", 1, -1,
-       "[-cnr] [-t mode-table] key command [arguments]",
+       "cnrt:T:", 1, -1,
+       "[-cnr] [-t mode-table] [-T key-table] key command [arguments]",
        0,
        cmd_bind_key_exec
 };
@@ -46,6 +46,7 @@ cmd_bind_key_exec(struct cmd *self, stru
        char            *cause;
        struct cmd_list *cmdlist;
        int              key;
+       const char      *tablename;
 
        if (args_has(args, 't')) {
                if (args->argc != 2 && args->argc != 3) {
@@ -68,6 +69,13 @@ cmd_bind_key_exec(struct cmd *self, stru
        if (args_has(args, 't'))
                return (cmd_bind_key_mode_table(self, cmdq, key));
 
+       if (args_has(args, 'T'))
+               tablename = args_get(args, 'T');
+       else if (args_has(args, 'n'))
+               tablename = "root";
+       else
+               tablename = "prefix";
+
        cmdlist = cmd_list_parse(args->argc - 1, args->argv + 1, NULL, 0,
            &cause);
        if (cmdlist == NULL) {
@@ -76,9 +84,7 @@ cmd_bind_key_exec(struct cmd *self, stru
                return (CMD_RETURN_ERROR);
        }
 
-       if (!args_has(args, 'n'))
-           key |= KEYC_PREFIX;
-       key_bindings_add(key, args_has(args, 'r'), cmdlist);
+       key_bindings_add(tablename, key, args_has(args, 'r'), cmdlist);
        return (CMD_RETURN_NORMAL);
 }
 
Index: cmd-list-keys.c
===================================================================
RCS file: /cvs/src/usr.bin/tmux/cmd-list-keys.c,v
retrieving revision 1.25
diff -u -p -r1.25 cmd-list-keys.c
--- cmd-list-keys.c     20 Oct 2014 23:27:14 -0000      1.25
+++ cmd-list-keys.c     13 Apr 2015 21:29:21 -0000
@@ -33,8 +33,8 @@ enum cmd_retval        cmd_list_keys_commands(
 
 const struct cmd_entry cmd_list_keys_entry = {
        "list-keys", "lsk",
-       "t:", 0, 0,
-       "[-t key-table]",
+       "t:T:", 0, 0,
+       "[-t mode-table] [-T key-table]",
        0,
        cmd_list_keys_exec
 };
@@ -51,58 +51,65 @@ enum cmd_retval
 cmd_list_keys_exec(struct cmd *self, struct cmd_q *cmdq)
 {
        struct args             *args = self->args;
+       struct key_table        *table;
        struct key_binding      *bd;
-       const char              *key;
-       char                     tmp[BUFSIZ], flags[8];
+       const char              *key, *tablename, *r;
+       char                     tmp[BUFSIZ];
        size_t                   used;
-       int                      width, keywidth;
+       int                      repeat, width, tablewidth, keywidth;
 
        if (self->entry == &cmd_list_commands_entry)
                return (cmd_list_keys_commands(self, cmdq));
 
        if (args_has(args, 't'))
                return (cmd_list_keys_table(self, cmdq));
+       tablename = args_get(args, 'T');
 
-       width = 0;
-
-       RB_FOREACH(bd, key_bindings, &key_bindings) {
-               key = key_string_lookup_key(bd->key & ~KEYC_PREFIX);
-               if (key == NULL)
+       repeat = 0;
+       tablewidth = keywidth = 0;
+       RB_FOREACH(table, key_tables, &key_tables) {
+               if (tablename != NULL && strcmp(table->name, tablename) != 0)
                        continue;
+               RB_FOREACH(bd, key_bindings, &(table->key_bindings)) {
+                       key = key_string_lookup_key(bd->key);
+                       if (key == NULL)
+                               continue;
 
-               keywidth = strlen(key);
-               if (!(bd->key & KEYC_PREFIX)) {
                        if (bd->can_repeat)
-                               keywidth += 4;
-                       else
-                               keywidth += 3;
-               } else if (bd->can_repeat)
-                       keywidth += 3;
-               if (keywidth > width)
-                       width = keywidth;
+                               repeat = 1;
+
+                       width = strlen(table->name);
+                       if (width > tablewidth)
+                               tablewidth =width;
+                       width = strlen(key);
+                       if (width > keywidth)
+                               keywidth = width;
+               }
        }
 
-       RB_FOREACH(bd, key_bindings, &key_bindings) {
-               key = key_string_lookup_key(bd->key & ~KEYC_PREFIX);
-               if (key == NULL)
+       RB_FOREACH(table, key_tables, &key_tables) {
+               if (tablename != NULL && strcmp(table->name, tablename) != 0)
                        continue;
-
-               *flags = '\0';
-               if (!(bd->key & KEYC_PREFIX)) {
-                       if (bd->can_repeat)
-                               xsnprintf(flags, sizeof flags, "-rn ");
+               RB_FOREACH(bd, key_bindings, &(table->key_bindings)) {
+                       key = key_string_lookup_key(bd->key);
+                       if (key == NULL)
+                               continue;
+
+                       if (!repeat)
+                               r = "";
+                       else if (bd->can_repeat)
+                               r = "-r ";
                        else
-                               xsnprintf(flags, sizeof flags, "-n ");
-               } else if (bd->can_repeat)
-                       xsnprintf(flags, sizeof flags, "-r ");
-
-               used = xsnprintf(tmp, sizeof tmp, "%s%*s ",
-                   flags, (int) (width - strlen(flags)), key);
-               if (used >= sizeof tmp)
-                       continue;
+                               r = "   ";
+                       used = xsnprintf(tmp, sizeof tmp, "%s-T %-*s %-*s ", r,
+                           (int)tablewidth, table->name, (int)keywidth, key);
+                       if (used < sizeof tmp) {
+                               cmd_list_print(bd->cmdlist, tmp + used,
+                                   (sizeof tmp) - used);
+                       }
 
-               cmd_list_print(bd->cmdlist, tmp + used, (sizeof tmp) - used);
-               cmdq_print(cmdq, "bind-key %s", tmp);
+                       cmdq_print(cmdq, "bind-key %s", tmp);
+               }
        }
 
        return (CMD_RETURN_NORMAL);
Index: cmd-switch-client.c
===================================================================
RCS file: /cvs/src/usr.bin/tmux/cmd-switch-client.c,v
retrieving revision 1.22
diff -u -p -r1.22 cmd-switch-client.c
--- cmd-switch-client.c 20 Oct 2014 22:29:25 -0000      1.22
+++ cmd-switch-client.c 13 Apr 2015 21:29:21 -0000
@@ -31,8 +31,8 @@ enum cmd_retval        cmd_switch_client_exec(
 
 const struct cmd_entry cmd_switch_client_entry = {
        "switch-client", "switchc",
-       "lc:npt:r", 0, 0,
-       "[-lnpr] [-c target-client] [-t target-session]",
+       "lc:npt:rT:", 0, 0,
+       "[-lnpr] [-c target-client] [-t target-session] [-T key-table]",
        CMD_READONLY,
        cmd_switch_client_exec
 };
@@ -46,7 +46,8 @@ cmd_switch_client_exec(struct cmd *self,
        struct winlink          *wl = NULL;
        struct window           *w = NULL;
        struct window_pane      *wp = NULL;
-       const char              *tflag;
+       const char              *tflag, *tablename;
+       struct key_table        *table;
 
        if ((c = cmd_find_client(cmdq, args_get(args, 'c'), 0)) == NULL)
                return (CMD_RETURN_ERROR);
@@ -56,6 +57,18 @@ cmd_switch_client_exec(struct cmd *self,
                        c->flags &= ~CLIENT_READONLY;
                else
                        c->flags |= CLIENT_READONLY;
+       }
+
+       tablename = args_get(args, 'T');
+       if (tablename != NULL) {
+               table = key_bindings_get_table(tablename, 0);
+               if (table == NULL) {
+                       cmdq_error(cmdq, "table %s doesn't exist", tablename);
+                       return (CMD_RETURN_ERROR);
+               }
+               table->references++;
+               key_bindings_unref_table(c->keytable);
+               c->keytable = table;
        }
 
        tflag = args_get(args, 't');
Index: cmd-unbind-key.c
===================================================================
RCS file: /cvs/src/usr.bin/tmux/cmd-unbind-key.c,v
retrieving revision 1.20
diff -u -p -r1.20 cmd-unbind-key.c
--- cmd-unbind-key.c    20 Oct 2014 22:29:25 -0000      1.20
+++ cmd-unbind-key.c    13 Apr 2015 21:29:21 -0000
@@ -31,8 +31,8 @@ enum cmd_retval        cmd_unbind_key_mode_tab
 
 const struct cmd_entry cmd_unbind_key_entry = {
        "unbind-key", "unbind",
-       "acnt:", 0, 1,
-       "[-acn] [-t mode-table] key",
+       "acnt:T:", 0, 1,
+       "[-acn] [-t mode-table] [-T key-table] key",
        0,
        cmd_unbind_key_exec
 };
@@ -40,9 +40,9 @@ const struct cmd_entry cmd_unbind_key_en
 enum cmd_retval
 cmd_unbind_key_exec(struct cmd *self, struct cmd_q *cmdq)
 {
-       struct args             *args = self->args;
-       struct key_binding      *bd;
-       int                      key;
+       struct args     *args = self->args;
+       int              key;
+       const char      *tablename;
 
        if (!args_has(args, 'a')) {
                if (args->argc != 1) {
@@ -66,16 +66,23 @@ cmd_unbind_key_exec(struct cmd *self, st
                return (cmd_unbind_key_mode_table(self, cmdq, key));
 
        if (key == KEYC_NONE) {
-               while (!RB_EMPTY(&key_bindings)) {
-                       bd = RB_ROOT(&key_bindings);
-                       key_bindings_remove(bd->key);
+               if (args_has(args, 'T')) {
+                       key_bindings_remove_table(args_get(args, 'T'));
+                       return (CMD_RETURN_NORMAL);
                }
+               key_bindings_remove_table("root");
+               key_bindings_remove_table("prefix");
                return (CMD_RETURN_NORMAL);
        }
 
-       if (!args_has(args, 'n'))
-               key |= KEYC_PREFIX;
-       key_bindings_remove(key);
+       if (args_has(args, 'T'))
+               tablename = args_get(args, 'T');
+       else if (args_has(args, 'n'))
+               tablename = "root";
+       else
+               tablename = "prefix";
+
+       key_bindings_remove(tablename, key);
        return (CMD_RETURN_NORMAL);
 }
 
Index: format.c
===================================================================
RCS file: /cvs/src/usr.bin/tmux/format.c,v
retrieving revision 1.60
diff -u -p -r1.60 format.c
--- format.c    31 Mar 2015 17:58:36 -0000      1.60
+++ format.c    13 Apr 2015 21:29:21 -0000
@@ -545,7 +545,11 @@ format_defaults_client(struct format_tre
        format_add(ft, "client_activity", "%lld", (long long) t);
        format_add(ft, "client_activity_string", "%s", format_time_string(t));
 
-       format_add(ft, "client_prefix", "%d", !!(c->flags & CLIENT_PREFIX));
+       if (strcmp(c->keytable->name, "root") == 0)
+               format_add(ft, "client_prefix", "%d", 0);
+       else
+               format_add(ft, "client_prefix", "%d", 1);
+       format_add(ft, "client_key_table", "%s", c->keytable->name);
 
        if (c->tty.flags & TTY_UTF8)
                format_add(ft, "client_utf8", "%d", 1);
Index: key-bindings.c
===================================================================
RCS file: /cvs/src/usr.bin/tmux/key-bindings.c,v
retrieving revision 1.43
diff -u -p -r1.43 key-bindings.c
--- key-bindings.c      22 Oct 2014 23:18:53 -0000      1.43
+++ key-bindings.c      13 Apr 2015 21:29:21 -0000
@@ -25,60 +25,121 @@
 #include "tmux.h"
 
 RB_GENERATE(key_bindings, key_binding, entry, key_bindings_cmp);
+RB_GENERATE(key_tables, key_table, entry, key_table_cmp);
+struct key_tables key_tables = RB_INITIALIZER(&key_tables);
 
-struct key_bindings    key_bindings;
+int
+key_table_cmp(struct key_table *e1, struct key_table *e2)
+{
+       return (strcmp(e1->name, e2->name));
+}
 
 int
 key_bindings_cmp(struct key_binding *bd1, struct key_binding *bd2)
 {
-       int     key1, key2;
+       return (bd1->key - bd2->key);
+}
+
+struct key_table *
+key_bindings_get_table(const char *name, int create)
+{
+       struct key_table        table_search, *table;
+
+       table_search.name = name;
+       table = RB_FIND(key_tables, &key_tables, &table_search);
+       if (table != NULL || !create)
+               return (table);
 
-       key1 = bd1->key & ~KEYC_PREFIX;
-       key2 = bd2->key & ~KEYC_PREFIX;
-       if (key1 != key2)
-               return (key1 - key2);
+       table = xmalloc(sizeof *table);
+       table->name = xstrdup(name);
+       RB_INIT(&table->key_bindings);
 
-       if (bd1->key & KEYC_PREFIX && !(bd2->key & KEYC_PREFIX))
-               return (-1);
-       if (bd2->key & KEYC_PREFIX && !(bd1->key & KEYC_PREFIX))
-               return (1);
-       return (0);
+       table->references = 1; /* one reference in key_tables */
+       RB_INSERT(key_tables, &key_tables, table);
+
+       return (table);
 }
 
-struct key_binding *
-key_bindings_lookup(int key)
+void
+key_bindings_unref_table(struct key_table *table)
 {
-       struct key_binding      bd;
+       struct key_binding      *bd;
 
-       bd.key = key;
-       return (RB_FIND(key_bindings, &key_bindings, &bd));
+       if (--table->references != 0)
+               return;
+
+       while (!RB_EMPTY(&table->key_bindings)) {
+               bd = RB_ROOT(&table->key_bindings);
+               RB_REMOVE(key_bindings, &table->key_bindings, bd);
+               cmd_list_free(bd->cmdlist);
+               free(bd);
+       }
+
+       free((void *)table->name);
+       free(table);
 }
 
 void
-key_bindings_add(int key, int can_repeat, struct cmd_list *cmdlist)
+key_bindings_add(const char *name, int key, int can_repeat,
+    struct cmd_list *cmdlist)
 {
-       struct key_binding      *bd;
+       struct key_table        *table;
+       struct key_binding       bd_search, *bd;
 
-       key_bindings_remove(key);
+       table = key_bindings_get_table(name, 1);
+
+       bd_search.key = key;
+       bd = RB_FIND(key_bindings, &table->key_bindings, &bd_search);
+       if (bd != NULL) {
+               RB_REMOVE(key_bindings, &table->key_bindings, bd);
+               cmd_list_free(bd->cmdlist);
+               free(bd);
+       }
 
        bd = xmalloc(sizeof *bd);
        bd->key = key;
-       RB_INSERT(key_bindings, &key_bindings, bd);
+       RB_INSERT(key_bindings, &table->key_bindings, bd);
 
        bd->can_repeat = can_repeat;
        bd->cmdlist = cmdlist;
 }
 
 void
-key_bindings_remove(int key)
+key_bindings_remove(const char *name, int key)
 {
-       struct key_binding      *bd;
+       struct key_table        *table;
+       struct key_binding       bd_search, *bd;
+
+       table = key_bindings_get_table(name, 0);
+       if (table == NULL)
+               return;
 
-       if ((bd = key_bindings_lookup(key)) == NULL)
+       bd_search.key = key;
+       bd = RB_FIND(key_bindings, &table->key_bindings, &bd_search);
+       if (bd == NULL)
                return;
-       RB_REMOVE(key_bindings, &key_bindings, bd);
+
+       RB_REMOVE(key_bindings, &table->key_bindings, bd);
        cmd_list_free(bd->cmdlist);
        free(bd);
+
+       if (RB_EMPTY(&table->key_bindings)) {
+               RB_REMOVE(key_tables, &key_tables, table);
+               key_bindings_unref_table(table);
+       }
+}
+
+void
+key_bindings_remove_table(const char *name)
+{
+       struct key_table        *table;
+
+       table = key_bindings_get_table(name, 0);
+       if (table == NULL)
+               return;
+
+       RB_REMOVE(key_tables, &key_tables, table);
+       key_bindings_unref_table(table);
 }
 
 void
@@ -164,8 +225,6 @@ key_bindings_init(void)
        char*            cause;
        int              error;
        struct cmd_q    *cmdq;
-
-       RB_INIT(&key_bindings);
 
        cmdq = cmdq_new(NULL);
        for (i = 0; i < nitems(defaults); i++) {
Index: server-client.c
===================================================================
RCS file: /cvs/src/usr.bin/tmux/server-client.c,v
retrieving revision 1.129
diff -u -p -r1.129 server-client.c
--- server-client.c     31 Mar 2015 17:45:10 -0000      1.129
+++ server-client.c     13 Apr 2015 21:29:21 -0000
@@ -100,6 +100,9 @@ server_client_create(int fd)
 
        c->flags |= CLIENT_FOCUSED;
 
+       c->keytable = key_bindings_get_table("root", 1);
+       c->keytable->references++;
+
        evtimer_set(&c->repeat_timer, server_client_repeat_timer, c);
 
        for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
@@ -171,6 +174,8 @@ server_client_lost(struct client *c)
 
        evtimer_del(&c->repeat_timer);
 
+       key_bindings_unref_table(c->keytable);
+
        if (event_initialized(&c->identify_timer))
                evtimer_del(&c->identify_timer);
 
@@ -362,33 +367,28 @@ server_client_assume_paste(struct sessio
 void
 server_client_handle_key(struct client *c, int key)
 {
-       struct session          *s;
+       struct session          *s = c->session;
        struct window           *w;
        struct window_pane      *wp;
        struct timeval           tv;
-       struct key_binding      *bd;
-       int                      xtimeout, isprefix, ispaste;
+       struct key_table        *table = c->keytable;
+       struct key_binding       bd_search, *bd;
+       int                      xtimeout;
 
        /* Check the client is good to accept input. */
-       if ((c->flags & (CLIENT_DEAD|CLIENT_SUSPENDED)) != 0)
-               return;
-
-       if (c->session == NULL)
+       if (s == NULL || (c->flags & (CLIENT_DEAD|CLIENT_SUSPENDED)) != 0)
                return;
-       s = c->session;
+       w = c->session->curw->window;
+       wp = w->active;
 
        /* Update the activity timer. */
        if (gettimeofday(&c->activity_time, NULL) != 0)
                fatal("gettimeofday failed");
-
        memcpy(&s->last_activity_time, &s->activity_time,
            sizeof s->last_activity_time);
        memcpy(&s->activity_time, &c->activity_time, sizeof s->activity_time);
 
-       w = c->session->curw->window;
-       wp = w->active;
-
-       /* Special case: number keys jump to pane in identify mode. */
+       /* Number keys jump to pane in identify mode. */
        if (c->flags & CLIENT_IDENTIFY && key >= '0' && key <= '9') {
                if (c->flags & CLIENT_READONLY)
                        return;
@@ -419,74 +419,89 @@ server_client_handle_key(struct client *
                return;
        }
 
-       /* Is this a prefix key? */
-       if (key == options_get_number(&s->options, "prefix"))
-               isprefix = 1;
-       else if (key == options_get_number(&s->options, "prefix2"))
-               isprefix = 1;
-       else
-               isprefix = 0;
+       /* Treat everything as a regular key when pasting is detected. */
+       if (server_client_assume_paste(s)) {
+               if (!(c->flags & CLIENT_READONLY))
+                       window_pane_key(wp, s, key);
+               return;
+       }
 
-       /* Treat prefix as a regular key when pasting is detected. */
-       ispaste = server_client_assume_paste(s);
-       if (ispaste)
-               isprefix = 0;
-
-       /* No previous prefix key. */
-       if (!(c->flags & CLIENT_PREFIX)) {
-               if (isprefix) {
-                       c->flags |= CLIENT_PREFIX;
+retry:
+       /* Try to see if there is a key binding in the current table. */
+       bd_search.key = key;
+       bd = RB_FIND(key_bindings, &table->key_bindings, &bd_search);
+       if (bd != NULL) {
+               /*
+                * Key was matched in this table. If currently repeating but
+                * a non-repeating binding was found, stop repeating and try
+                * again in the root table.
+                */
+               if ((c->flags & CLIENT_REPEAT) && !bd->can_repeat) {
+                       server_set_key_table(c, "root");
+                       c->flags &= ~CLIENT_REPEAT;
                        server_status_client(c);
-                       return;
+                       goto retry;
                }
 
-               /* Try as a non-prefix key binding. */
-               if (ispaste || (bd = key_bindings_lookup(key)) == NULL) {
-                       if (!(c->flags & CLIENT_READONLY))
-                               window_pane_key(wp, s, key);
-               } else
-                       key_bindings_dispatch(bd, c);
-               return;
-       }
-
-       /* Prefix key already pressed. Reset prefix and lookup key. */
-       c->flags &= ~CLIENT_PREFIX;
-       server_status_client(c);
-       if ((bd = key_bindings_lookup(key | KEYC_PREFIX)) == NULL) {
-               /* If repeating, treat this as a key, else ignore. */
-               if (c->flags & CLIENT_REPEAT) {
+               /*
+                * Take a reference to this table to make sure the key binding
+                * doesn't disappear.
+                */
+               table->references++;
+
+               /*
+                * If this is a repeating key, start the timer. Otherwise reset
+                * the client back to the root table.
+                */
+               xtimeout = options_get_number(&s->options, "repeat-time");
+               if (xtimeout != 0 && bd->can_repeat) {
+                       c->flags |= CLIENT_REPEAT;
+
+                       tv.tv_sec = xtimeout / 1000;
+                       tv.tv_usec = (xtimeout % 1000) * 1000L;
+                       evtimer_del(&c->repeat_timer);
+                       evtimer_add(&c->repeat_timer, &tv);
+               } else {
                        c->flags &= ~CLIENT_REPEAT;
-                       if (isprefix)
-                               c->flags |= CLIENT_PREFIX;
-                       else if (!(c->flags & CLIENT_READONLY))
-                               window_pane_key(wp, s, key);
+                       server_set_key_table(c, "root");
                }
+               server_status_client(c);
+
+               /* Dispatch the key binding. */
+               key_bindings_dispatch(bd, c);
+               key_bindings_unref_table(table);
+
                return;
        }
 
-       /* If already repeating, but this key can't repeat, skip it. */
-       if (c->flags & CLIENT_REPEAT && !bd->can_repeat) {
+       /*
+        * No match in this table. If repeating, switch the client back to the
+        * root table and try again.
+        */
+       if (c->flags & CLIENT_REPEAT) {
+               server_set_key_table(c, "root");
                c->flags &= ~CLIENT_REPEAT;
-               if (isprefix)
-                       c->flags |= CLIENT_PREFIX;
-               else if (!(c->flags & CLIENT_READONLY))
-                       window_pane_key(wp, s, key);
-               return;
+               server_status_client(c);
+               goto retry;
        }
 
-       /* If this key can repeat, reset the repeat flags and timer. */
-       xtimeout = options_get_number(&s->options, "repeat-time");
-       if (xtimeout != 0 && bd->can_repeat) {
-               c->flags |= CLIENT_PREFIX|CLIENT_REPEAT;
-
-               tv.tv_sec = xtimeout / 1000;
-               tv.tv_usec = (xtimeout % 1000) * 1000L;
-               evtimer_del(&c->repeat_timer);
-               evtimer_add(&c->repeat_timer, &tv);
+       /* If no match and we're not in the root table, that's it. */
+       if (strcmp(c->keytable->name, "root") != 0) {
+               server_set_key_table(c, "root");
+               server_status_client(c);
+               return;
        }
 
-       /* Dispatch the command. */
-       key_bindings_dispatch(bd, c);
+       /*
+        * No match, but in the root table. Prefix switches to the prefix table
+        * and everything else is passed through.
+        */
+       if (key == options_get_number(&s->options, "prefix") ||
+           key == options_get_number(&s->options, "prefix2")) {
+               server_set_key_table(c, "prefix");
+               server_status_client(c);
+       } else if (!(c->flags & CLIENT_READONLY))
+               window_pane_key(wp, s, key);
 }
 
 /* Client functions that need to happen every loop. */
@@ -692,9 +707,9 @@ server_client_repeat_timer(unused int fd
        struct client   *c = data;
 
        if (c->flags & CLIENT_REPEAT) {
-               if (c->flags & CLIENT_PREFIX)
-                       server_status_client(c);
-               c->flags &= ~(CLIENT_PREFIX|CLIENT_REPEAT);
+               server_set_key_table(c, "root");
+               c->flags &= ~CLIENT_REPEAT;
+               server_status_client(c);
        }
 }
 
Index: server-fn.c
===================================================================
RCS file: /cvs/src/usr.bin/tmux/server-fn.c,v
retrieving revision 1.79
diff -u -p -r1.79 server-fn.c
--- server-fn.c 31 Mar 2015 17:45:10 -0000      1.79
+++ server-fn.c 13 Apr 2015 21:29:22 -0000
@@ -101,6 +101,14 @@ server_status_client(struct client *c)
 }
 
 void
+server_set_key_table(struct client *c, const char *name)
+{
+       key_bindings_unref_table(c->keytable);
+       c->keytable = key_bindings_get_table(name, 1);
+       c->keytable->references++;
+}
+
+void
 server_redraw_session(struct session *s)
 {
        struct client   *c;
Index: tmux.1
===================================================================
RCS file: /cvs/src/usr.bin/tmux/tmux.1,v
retrieving revision 1.417
diff -u -p -r1.417 tmux.1
--- tmux.1      10 Apr 2015 16:00:08 -0000      1.417
+++ tmux.1      13 Apr 2015 21:29:23 -0000
@@ -838,6 +838,7 @@ Suspend a client by sending
 .Op Fl lnpr
 .Op Fl c Ar target-client
 .Op Fl t Ar target-session
+.Op Fl T Ar key-table
 .Xc
 .D1 (alias: Ic switchc )
 Switch the current session for client
@@ -855,6 +856,9 @@ respectively.
 toggles whether a client is read-only (see the
 .Ic attach-session
 command).
+.Fl T
+sets the client's key table; the next key from the client will be interpreted 
from
+.Ar key-table .
 .El
 .Sh WINDOWS AND PANES
 A
@@ -1905,6 +1909,7 @@ Commands related to key bindings are as 
 .It Xo Ic bind-key
 .Op Fl cnr
 .Op Fl t Ar mode-table
+.Op Fl T Ar key-table
 .Ar key Ar command Op Ar arguments
 .Xc
 .D1 (alias: Ic bind )
@@ -1940,18 +1945,41 @@ or for normal mode without.
 To view the default bindings and possible commands, see the
 .Ic list-keys
 command.
-.It Ic list-keys Op Fl t Ar key-table
+.Pp
+If
+.Fl T
+is present,
+.Ar key
+is bound in
+.Ar key-table :
+.Em prefix
+corresponds to the default,
+.Em root
+corresponds to
+.Fl n ,
+and custom values may be used with
+.Ic switch-client
+.Fl T .
+.It Xo Ic list-keys
+.Op Fl t Ar mode-table
+.Op Fl T Ar key-table
+.Xc
 .D1 (alias: Ic lsk )
 List all key bindings.
 Without
 .Fl t
-the primary key bindings - those executed when preceded by the prefix key -
-are printed.
+or
+.Fl T
+all key tables are printed.
+With
+.Fl T
+only
+.Ar key-table .
 .Pp
 With
 .Fl t ,
 the key bindings in
-.Ar key-table
+.Ar mode-table
 are listed; this may be one of:
 .Em vi-edit ,
 .Em emacs-edit ,
@@ -1992,6 +2020,7 @@ the secondary prefix key, to a window as
 .It Xo Ic unbind-key
 .Op Fl acn
 .Op Fl t Ar mode-table
+.Op Fl T Ar key-table
 .Ar key
 .Xc
 .D1 (alias: Ic unbind )
@@ -2017,6 +2046,22 @@ in
 is unbound: the binding for command mode with
 .Fl c
 or for normal mode without.
+.Pp
+If
+.Fl T
+is present,
+.Ar key
+in
+.Ar key-table
+is unbound:
+.Em prefix
+corresponds to the default,
+.Em root
+corresponds to
+.Fl n ,
+and custom values may be used with
+.Ic switch-client
+.Fl T .
 .El
 .Sh OPTIONS
 The appearance and behaviour of
Index: tmux.h
===================================================================
RCS file: /cvs/src/usr.bin/tmux/tmux.h,v
retrieving revision 1.490
diff -u -p -r1.490 tmux.h
--- tmux.h      6 Feb 2015 17:21:08 -0000       1.490
+++ tmux.h      13 Apr 2015 21:29:23 -0000
@@ -89,10 +89,9 @@ extern char   **environ;
 #define KEYC_ESCAPE 0x2000
 #define KEYC_CTRL 0x4000
 #define KEYC_SHIFT 0x8000
-#define KEYC_PREFIX 0x10000
 
 /* Mask to obtain key w/o modifiers. */
-#define KEYC_MASK_MOD (KEYC_ESCAPE|KEYC_CTRL|KEYC_SHIFT|KEYC_PREFIX)
+#define KEYC_MASK_MOD (KEYC_ESCAPE|KEYC_CTRL|KEYC_SHIFT)
 #define KEYC_MASK_KEY (~KEYC_MASK_MOD)
 
 /* Other key codes. */
@@ -1287,7 +1286,7 @@ struct client {
        struct screen    status;
 
 #define CLIENT_TERMINAL 0x1
-#define CLIENT_PREFIX 0x2
+/* 0x2 unused */
 #define CLIENT_EXIT 0x4
 #define CLIENT_REDRAW 0x8
 #define CLIENT_STATUS 0x10
@@ -1306,6 +1305,7 @@ struct client {
 #define CLIENT_256COLOURS 0x20000
 #define CLIENT_IDENTIFIED 0x40000
        int              flags;
+       struct key_table *keytable;
 
        struct event     identify_timer;
 
@@ -1423,15 +1423,24 @@ struct cmd_entry {
        enum cmd_retval  (*exec)(struct cmd *, struct cmd_q *);
 };
 
-/* Key binding. */
+/* Key binding and key table. */
 struct key_binding {
-       int              key;
-       struct cmd_list *cmdlist;
-       int              can_repeat;
+       int                      key;
+       struct cmd_list         *cmdlist;
+       int                      can_repeat;
 
-       RB_ENTRY(key_binding) entry;
+       RB_ENTRY(key_binding)    entry;
 };
 RB_HEAD(key_bindings, key_binding);
+struct key_table {
+       const char               *name;
+       struct key_bindings      key_bindings;
+
+       u_int                    references;
+
+       RB_ENTRY(key_table)      entry;
+};
+RB_HEAD(key_tables, key_table);
 
 /*
  * Option table entries. The option table is the user-visible part of the
@@ -1848,12 +1857,16 @@ void    cmd_wait_for_flush(void);
 int    client_main(int, char **, int);
 
 /* key-bindings.c */
-extern struct key_bindings key_bindings;
-int     key_bindings_cmp(struct key_binding *, struct key_binding *);
 RB_PROTOTYPE(key_bindings, key_binding, entry, key_bindings_cmp);
-struct key_binding *key_bindings_lookup(int);
-void    key_bindings_add(int, int, struct cmd_list *);
-void    key_bindings_remove(int);
+RB_PROTOTYPE(key_tables, key_table, entry, key_table_cmp);
+extern struct key_tables key_tables;
+int     key_table_cmp(struct key_table *, struct key_table *);
+int     key_bindings_cmp(struct key_binding *, struct key_binding *);
+struct          key_table *key_bindings_get_table(const char *, int);
+void    key_bindings_unref_table(struct key_table *);
+void    key_bindings_add(const char *, int, int, struct cmd_list *);
+void    key_bindings_remove(const char *, int);
+void    key_bindings_remove_table(const char *);
 void    key_bindings_init(void);
 void    key_bindings_dispatch(struct key_binding *, struct client *);
 
@@ -1889,6 +1902,7 @@ void       server_write_session(struct sessio
             size_t);
 void    server_redraw_client(struct client *);
 void    server_status_client(struct client *);
+void    server_set_key_table(struct client *, const char *);
 void    server_redraw_session(struct session *);
 void    server_redraw_session_group(struct session *);
 void    server_status_session(struct session *);




On Mon, Apr 13, 2015 at 03:21:52PM +0000, Ross Hadden wrote:
> Keith Amling <amling <at> palantir.com> writes:
> 
> > 
> > > > > Or are you thinking of creating the table after running the set 
> command?
> > > > > This shouldn't work - you shouldn't be able to set a client to a
> > > > > nonexistent table.
> > > > 
> > > > I guess I don't super care what happens since I won't personally be
> > > > writing any switch-client -T into an empty table but I had assumed we
> > > > would allow switching to a new [and ephemeral] table since otherwise
> > > > switch-client -T can fail which just seems weird to me.
> > > 
> > > I'd say it should fail if the table doesn't exist.
> > > 
> > > I can't think of a case where I would want it to automatically create a
> > > table, except to confuse people who make a typo in the table name. Do
> > > you have a use in mind?
> > 
> > Not specifically, I just prefer to see tools degrade what might be
> > described as "uniformly" where possible.  Nonuniform behaviour makes
> > tools dangerous for automated use because when writing a script you're
> > unlikely to think of things like "what if this table is empty" or "what
> > if this command barfs on no args when really no args means I just didn't
> > need it to do anything".
> > 
> > I'll switch it and the next set of patches will be up shortly.
> > 
> > Keith
> > 
> > --------------------------------------------------------------------------
> ----
> > "Accelerate Dev Cycles with Automated Cross-Browser Testing - For FREE
> > Instantly run your Selenium tests across 300+ browser/OS combos.
> > Get unparalleled scalability from the best Selenium testing platform 
> available
> > Simple to use. Nothing to install. Get started now for free."
> > http://p.sf.net/sfu/SauceLabs
> > 
> 
> 
> Has work on this continued?  I made an issue about it 
> (https://sourceforge.net/p/tmux/tickets/172/) in an effort to bring 
> attention to this patch, but Thomas said it's pretty much not going anywhere 
> unless the original patch author continues or makes an effort to get it 
> merged himself.
> 
> I would love to see this landed in tmux!  My current workaround can be seen 
> at https://github.com/rosshadden/dotfiles/blob/master/src/.tmux.conf#L79-L85 
> and https://github.com/rosshadden/dotfiles/blob/master/src/lib/tmux-
> cords.sh.
> 
> 
> ------------------------------------------------------------------------------
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> source=Sourceforge_BPM_Camp_5_6_15&utm_medium=email&utm_campaign=VA_SF
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> https://lists.sourceforge.net/lists/listinfo/tmux-users

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