7e7e291b20 broke 'zle -C' completions, as reported in #278 just now.

Re-Fixes zsh-users/zsh-syntax-highlighting#278.

The last commit inadvertently broke interactive use, although the test suite passed.

See issue #278.

The 'eval' was never needed, and the lack of proper quoting of the interpolated
variables caused issues, such as #278.

Fixes zsh-users/zsh-syntax-highlighting#278.

- Extract duplicated code into a new function.
  This makes it easier to add support for other entries in the
  future, that cannot be accessed in the current version of zsh
  (isearch, suffix).
- Make decision logic more comprehensible.
- Respect deliberately empty entries in zle_highlight.
  Don't force the default value when the user deliberately sets
  an entry in zle_highlight to the empty string.
  For example
    zle_highligh(paste:)
  to disable paste highlighting completely.

While here, also add a test for the '!' reserved word (which is highlighted
since c216242b).

Thanks to Andrew Janke.

Fixes zsh-users/zsh-syntax-highlighting#270.

* m0vie/p_bindings:
  widget binding: don't exlude widgets with identical function name
  widget binding: don't exclude widgets starting with '_'

Skipping when $cur_widgets == user:$cur_widget was introduced
with 776453cb5b. However there
are cases where this is not just an 'already rebound' event, but
simply a normal widget whose function name happens to be identical
to its widget name.

Example:
expand-absolute-path is a widget whose function name is also
expand-absolute-path. No reason why this should be ignored.

Another example:
edit-command-line

This is a continuation of 451665cb2a which did
the same for the $PS3 prompt.

Reported-by: Sebastian Gniazdowski

Optimization: -1 is extra computation of string length internally

./parse.zsh "zplugin.zsh" > out_norm.txt 106,17s user 7,84s system 98% cpu 1:55,85 total

./parse.zsh "zplugin.zsh" > out_opt.txt 51,91s user 7,44s system 99% cpu 59,912 total

% wc -l zplugin.zsh
3188 zplugin.zsh

Have master self-describe as 0.5.0-dev, since an 0.4.1 release is upcoming on
another branch.

The input to the $PS3 prompt is not commands, so the 'main' highlighter is
not applicable to it.

Fixes zsh-users/zsh-syntax-highlighting#268.

No functional change, except that error messages are now more readable.

The '--' guard was correct; it was there to guard against arguments belonging
to the syntax «zle widget [ -n num ] [ -Nw ] [ -K keymap ] args».

For example, this affected using <backward-kill-word> over
    BUFFER="-w "
    CURSOR=3
after
    autoload -Uz select-word-style
    select-word-style default
    zstyle ':zle:backward-kill-word' word-style shell
.

This reverts commit c808d2187a.

Fixes zsh-users/zsh-syntax-highlighting#262.

Currently, 'make quiet-test' uses Perl.  However, since it is considered a development
tool rather than a user-facing tool, users and downstream packages needn't install Perl.
Furthermore, even this dev-only dependency may be dropped in the future.

The only difference between tests/tap-filter here and the one in the issue is using
a `cat` subshell v. using 'undef $/; <STDIN>'.

Just because a widget starts with _ does not mean it should be
skipped when rebinding. The only reason widgets need to be skipped
is when their function name start with _zsh_highlight_widget*,
which is checked later.

Example:
_expand_alias (^Xa) needs to be wrapped.

The exclusion of _* was introduced in 186d80054a
to fix #65, but it is not needed. The relevant exclusion of
_zsh_highlight_widget* is already enough due to the case statement.

The Debian package should propagate to the "testing" suite (stretch) in a few days.

This fixes fd's specified by a (single) digit.  The named fd syntax remains an XFail.

The default for [redirection] is 'none', so it wasn't actually being tested.

The important part of this change is removing the second conjunct from the
condition; the remainder of the change gives one example of when that matters.

Also fix an error in the title of the 0.4.0 section.

Merge remote-tracking branch 'danielsh/docs-highlighters.d-landing-page-v3'

* danielsh/docs-highlighters.d-landing-page-v3:
  docs: Restore (with changes) links removed in f5ca4b891b.
  docs: Followup to the recent docs branch: clean up some internal cross-references.
  docs: Clarify tagline summary of 'root' highlighter
  docs: Minor clarification.

Fixes zsh-users/zsh-syntax-highlighting#242.

The preceding commit, which made docs/highlighters.md and
highlighters/README.md distinct, allows reverting their removal.