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driver: Probe for the memo feature in the startup code

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Matthew Martin 2020-08-10 18:05:26 -05:00
parent e4408343a1
commit 116fdcd436
2 changed files with 42 additions and 44 deletions
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42
driver.zsh
View file

@ -204,6 +204,48 @@ _zsh_highlight_load_highlighters()
autoload -Uz _zsh_highlight_internal
# Probe the memo= feature.
region_highlight+=( " 0 0 fg=red, memo=zsh-syntax-highlighting" )
case ${region_highlight[-1]} in
("0 0 fg=red")
# zsh 5.8 or earlier
integer -gr zsh_highlight__memo_feature=0
;;
("0 0 fg=red memo=zsh-syntax-highlighting")
# zsh 5.9 or later
integer -gr zsh_highlight__memo_feature=1
;;
(" 0 0 fg=red, memo=zsh-syntax-highlighting") ;&
(*)
# We can get here in two ways:
#
# 1. When not running as a widget. In that case, $region_highlight is
# not a special variable (= one with custom getter/setter functions
# written in C) but an ordinary one, so the third case pattern matches
# and we fall through to this block. (The test suite uses this codepath.)
#
# 2. When running under a future version of zsh that will have changed
# the serialization of $region_highlight elements from their underlying
# C structs, so that none of the previous case patterns will match.
#
# In either case, fall back to a version check.
#
# The memo= feature was added to zsh in commit zsh-5.8-172-gdd6e702ee.
# The version number at the time was 5.8.0.2-dev (see Config/version.mk).
# Therefore, on 5.8.0.3 and newer the memo= feature is available.
#
# On zsh version 5.8.0.2 between the aforementioned commit and the
# first Config/version.mk bump after it (which, at the time of writing,
# is yet to come), this condition will false negative.
if is-at-least 5.8.0.3 $ZSH_VERSION.0.0; then
integer -gr zsh_highlight__memo_feature=1
else
integer -gr zsh_highlight__memo_feature=0
fi
;;
esac
region_highlight[-1]=()
# Resolve highlighters directory location.
_zsh_highlight_load_highlighters "${ZSH_HIGHLIGHT_HIGHLIGHTERS_DIR:-${${0:A}:h}/highlighters}" || {
print -r -- >&2 'zsh-syntax-highlighting: failed loading highlighters, exiting.'

44
zsh-syntax-highlighting.zsh
View file

@ -50,50 +50,6 @@ _zsh_highlight()
return $ret
}
# Probe the memo= feature, once.
(( ${+zsh_highlight__memo_feature} )) || {
region_highlight+=( " 0 0 fg=red, memo=zsh-syntax-highlighting" )
case ${region_highlight[-1]} in
("0 0 fg=red")
# zsh 5.8 or earlier
integer -gr zsh_highlight__memo_feature=0
;;
("0 0 fg=red memo=zsh-syntax-highlighting")
# zsh 5.9 or later
integer -gr zsh_highlight__memo_feature=1
;;
(" 0 0 fg=red, memo=zsh-syntax-highlighting") ;&
(*)
# We can get here in two ways:
#
# 1. When not running as a widget. In that case, $region_highlight is
# not a special variable (= one with custom getter/setter functions
# written in C) but an ordinary one, so the third case pattern matches
# and we fall through to this block. (The test suite uses this codepath.)
#
# 2. When running under a future version of zsh that will have changed
# the serialization of $region_highlight elements from their underlying
# C structs, so that none of the previous case patterns will match.
#
# In either case, fall back to a version check.
#
# The memo= feature was added to zsh in commit zsh-5.8-172-gdd6e702ee.
# The version number at the time was 5.8.0.2-dev (see Config/version.mk).
# Therefore, on 5.8.0.3 and newer the memo= feature is available.
#
# On zsh version 5.8.0.2 between the aforementioned commit and the
# first Config/version.mk bump after it (which, at the time of writing,
# is yet to come), this condition will false negative.
if is-at-least 5.8.0.3 $ZSH_VERSION.0.0; then
integer -gr zsh_highlight__memo_feature=1
else
integer -gr zsh_highlight__memo_feature=0
fi
;;
esac
region_highlight[-1]=()
}
# Reset region_highlight to build it from scratch
if (( zsh_highlight__memo_feature )); then
region_highlight=( "${(@)region_highlight:#*memo=zsh-syntax-highlighting*}" )