Along with the arrow keys, xterm sends different sequences for the
Home and End keys depending on whether it is in "normal cursor keys"
mode or "application cursor keys" mode.
tmux puts xterm clients into "normal cursor keys" mode or
"application cursor keys" mode, depending on the active pane's
"application keypad" mode (initially, "normal cursor keys" mode via
rmkx in tty_start_tty; then "tracking the active pane" via smkx or
rmkx in tty_update_mode from server_client_reset_state).
However, the xterm terminfo entry only provides the "application
cursor keys" mode sequences (in khome and kend). Thus, tmux will
fail to recognize a client xterm's Home and End key sequences unless
the active pane is in "application keypad mode".
This inconsistent recognition is a problem if Home or End are used
as a prefix or in a binding: it may be impossible to type the prefix
or trigger the binding. It may also cause problems for programs
running in a pane: (unless they send screen's smkx sequence, which
they really should!) they will see the foreign xterm-style "normal
cursor keys" mode sequences for Home and End (e.g. Home's "^[[H"
leaks through tmux as two keystrokes: "M-[" and "H") instead of
being translated to the *different* screen-style sequences.
This inconsistency does not happen for the arrow keys because
tty_default_raw_keys supplies "hard coded" support for both variants
of the arrow key sequences. To fix this problem for Home and End,
give them similar support. According to xterm's ctlseqs
documentation, these are the only other keys affected by the cursor
keys mode.
Another approach would be to always put the client terminal in
"keyboard transmit" mode (smkx). It looks like tmux actually
operated like this in the past, but it was changed to the current
"track the pane mode" in OpenBSD patchset 579 (2009-12-04, ddb5bb80
in the current Git repository).
---
tty-keys.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/tty-keys.c b/tty-keys.c
index 575920e..25e0ef8 100644
--- a/tty-keys.c
+++ b/tty-keys.c
@@ -82,6 +82,13 @@ const struct tty_default_key_raw tty_default_raw_keys[] = {
{ "\033[C", KEYC_RIGHT },
{ "\033[D", KEYC_LEFT },
+ /* Other (xterm) "cursor" keys */
+ { "\033OH", KEYC_HOME },
+ { "\033OF", KEYC_END },
+
+ { "\033[H", KEYC_HOME },
+ { "\033[F", KEYC_END },
+
/* rxvt-style arrow + modifier keys. */
{ "\033Oa", KEYC_UP|KEYC_CTRL },
{ "\033Ob", KEYC_DOWN|KEYC_CTRL },
--
1.8.1.3
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