Сабж. Изменения ветки 5.4:
Changes from 5.3.1 to 5.4
-------------------------
The 'exec' and 'command' precommand modifiers, and options to them, are
now parsed after parameter expansion. Previously, both the modifier and
any options to it were parsed between alias expansion and parameter
expansion (see zshexpn(1)), so they could neither be quoted nor be the
result of parameter expansion. Examples: 's=command; $s -V ls' and
'\command -V ls' now work as expected.
Functions executed by ZLE widgets no longer have their standard input
closed, but redirected from /dev/null instead. That still guards
against user defined widgets inadvertently reading from the tty device.
There is an option WARN_NESTED_VAR, a companion to the existing
WARN_CREATE_GLOBAL that causes a warning if a function updates a
variable from an enclosing scope without using typeset -g. It can be
turned on for an individual function with "functions -W".
zmodload now has an option -s to be silent on a failure to find a module
but still print other errors.
Incompatibilities since 5.3.1
-----------------------------
1) The default behaviour of code like the following has changed:
alias foo='noglob foo'
foo() { print function body; }
When this is encountered in a start-up file, or other place where input
was read line by line, "foo" is in command position and is expanded as
an alias before the function definition takes place. In previous
versions of the shell, this caused two functions "noglob" and "foo" to
be defined. Any expansion of an alias in a function definition is
nearly always an unintended effect, as well as hard to detect, so has
been made an error. (The option setting NO_MULTI_FUNC_DEF turned this
case into an error, but did not help with other cases and is off by
default.) The alternative, of not expanding the alias, was rejected as
it was more difficult to achieve in the parser and also would silently
change the shell's behaviur between versions. A new option,
ALIAS_FUNC_DEF, has been added, which can be set to make the shell
behave as in previous versions. It is in any case recommended to use
the "function" keyword, as aliases are not expanded afterwards.
2) It was an undocumented, and largely useless, feature that a function
autoloaded with an absolute path was searched for along the normal fpath
(as if the leading / was missing) and, if found, loaded under the full
name including the leading slash. This has been replaced with the more
useful feature that the function is searched for only at the given
absolute path; the name of the function is the base name of the file.
Note that functions including a non-leading / behave as before,
e.g. if `dir/name' is found anywhere under a directory in $fpath it is
loaded as a function named `dir/name'.
3) vcs_info: When neither a set-patch-format nor a gen-applied-string
(resp. gen-unapplied-string) hook is set, vcs_info now '%'-escapes the
applied-string (resp. unapplied-string) before interpolating it into the
patch-format string, to prevent literal `%' signs in the interpolated
value from being interpreted as prompt escape sequences. If you use
${vcs_info_msg_0_} in a context other than the shell prompt, you may need
to undo the escaping with:
print -v vcs_info_msg_0_ -Pr -- "${vcs_info_msg_0_}"
This is also needed if $vcs_info_msg_0_ is used to set $psvar.
4) functions executed by ZLE widgets no longer have their standard input
closed, but redirected from /dev/null instead. That still guards
against user defined widgets inadvertently reading from the tty device,
and addresses the antisocial behaviour of running a command with its
stdin closed.
5) [New between 5.4.1 and 5.4.2] In previous versions of the shell, the
following code:
() { setopt err_return; false; echo 'oh no' } && true
printed "oh no", as the ERR_RETURN behaviour was suppressed when
a function was executed on the left hand side of an "&&" list. This was
undocumented and inconvenient as it is generally more useful to consider
execution within a function in isolation from its environment. The shell
now returns from the function on executing `false'. (This is general
to all functions; an anonymous function is shown here for compactness.)
https://fourdots.com/mirror/zsh/zsh-5.4.2-doc.tar.xz
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