Revert detach-client part of last, did not intend this to go in.

Do not consider a selection present if it is empty, from Michael Grant
(GitHub issue 3869). Also a typo fix from GitHub issue 3877.

Add args parsing callback for some future work, currently unused.

Make client -c and -t handling common in cmd-queue.c and try to be
clearer about whether the client is the target client (must have a
session) or not.

Also move cmdq_item and cmdq_list into cmd-queue.c (this is to make its
use more clearly defined and preparation for some future work).

Make struct cmd local to cmd.c and move it out of tmux.h.

Get rid of the extra layer of flags and cmd_prepare() and just store the
CMD_FIND_* flags in the cmd_entry and call it for the command. Commands
with special requirements call it themselves and updat

Get rid of the extra layer of flags and cmd_prepare() and just store the
CMD_FIND_* flags in the cmd_entry and call it for the command. Commands
with special requirements call it themselves and update the target for
hooks to use.

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Add a suspend helper function, and do not allow detaching or suspending
while already doing so.

Add -E to detach-client to exec a command to replace the client instead
of exiting it, useful if tmux wasn't exec'd itself. From Jenna Magius.

Mass rename struct cmd_q to struct cmdq_item and related.

Add static in cmd-* and fix a few other nits.

I no longer use my SourceForge address so replace it.

Instead of combined flags for -c, -s, -t, split into different sets
using an enum and simplify the parsing code.

Use member names in cmd_entry definitions so I stop getting confused
about the order.

Instead of every command resolving the target (-t or -s) itself, prepare
the state (client, session, winlink, pane) for it it before entering the
command. Each command provides some flags that tell t

Instead of every command resolving the target (-t or -s) itself, prepare
the state (client, session, winlink, pane) for it it before entering the
command. Each command provides some flags that tell the prepare step
what it is expecting.

This is a requirement for having hooks on commands (for example, if you
hook "select-window -t1:2", the hook command should to operate on window
1:2 not whatever it thinks is the current window), and should allow some
other target improvements.

The old cmd_find_* functions remain for the moment but that layer will
be dropped later.

Joint work with Thomas Adam.

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Add hooks infrastructure, basic commands (set-hook, show-hooks) and a
couple of not very useful client hooks. This will eventually let
commands be run at various points and on notifications. Joint wo

Add hooks infrastructure, basic commands (set-hook, show-hooks) and a
couple of not very useful client hooks. This will eventually let
commands be run at various points and on notifications. Joint work with
Thomas Adam.

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Fix usage of detach-client.

Break the common process set up, event loop and imsg dispatch code
between server and client out into a separate internal API. This will
make it easier to add another process.

Convert clients list into a TAILQ.

Tidy up detach-client a bit.

Move suspend-client code into detach-client.

Instead of setting up the default keys by building the key struct
directly with a helper function in the cmd_entry, include a table of
bind-key commands and pass them through the command parser and a

Instead of setting up the default keys by building the key struct
directly with a helper function in the cmd_entry, include a table of
bind-key commands and pass them through the command parser and a
temporary cmd_q.

As well as being smaller, this will allow default bindings to be command
sequences which will probably be needed soon.

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Fix detach -a by skipping clients where the session is NULL.

Show session name in detached message. Requested by somebody a few
months ago who didn't bother testing it. But it works for me anyway.

Remove the barely-used and unnecessary command check() function.