Conditional macro?

[Kevin J. McCarthy]

On Fri, Dec 07, 2018 at 03:47:05PM +0100, Michael Wagner wrote:
>I have tested this and when I change the folder the error message is
>
><limit>.<Enter>: unknown command

You'll need to use the push command to execute functions inside a folder
hook:
  http://www.mutt.org/doc/manual/#push

However, the push command is a bit tricky in this case.  The pushed 
functions (e.g., <limit>) aren't run immediately: they are stored up and 
run *after* all the folder-hooks are done.

They are stored up in a "stack", like a stack of plates.  Each new push 
adds a "plate" (i.e. function), to the top of the stack.

Then, after the folder-hooks have all run, the functions are executed 
one by one starting with the top "plate".

To summarize, the *folder-hooks* are run in the order they occur in your 
muttrc.  But if those hooks use the push command, the pushed *functions* 
end up being run in reverse order (because the last function pushed is 
on the top of the stack).

This example is fine, because the "." folder-hook runs first setting the 
default macro.  The override for "All Mail" runs second and will 
overwrite the first macro:

    # In most folders, pressing L limits to new messages
    folder-hook . "macro index L '<limit>~N<Enter>'"

    # In [Gmail]/All Mail, pressing L limits to unread messages
    folder-hook '^\[Gmail\]\/All Mail$' "macro index L '<limit>~U<Enter>'"


However, in this case I have reversed the order of the folder hooks:

    # In [Gmail]/All Mail, show only unread messages
    folder-hook '^\[Gmail\]\/All Mail$' "push <limit>~U<Enter>"

    # By default, show all messages
    folder-hook . "push <limit>~A<Enter>"

The push command is run immediately, but the string it pushes is run 
*after* all the folder-hooks finish.  So in the case, you would want the 
default "<limit>.<Enter>" to be run first.  Then for "All Mail" you 
would want the "<limit>~U<Enter>" to be run afterwards.

Sorry for the long post, but I hope that helps a rather confusing topic.

-- 
Kevin J. McCarthy
GPG Fingerprint: 8975 A9B3 3AA3 7910 385C  5308 ADEF 7684 8031 6BDA
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