zsh-autosuggestions/src/highlight.zsh

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#--------------------------------------------------------------------#
# Highlighting #
#--------------------------------------------------------------------#
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# If there was a highlight, remove it
_zsh_autosuggest_highlight_reset() {
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typeset -g _ZSH_AUTOSUGGEST_LAST_HIGHLIGHT
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if [ -n "$_ZSH_AUTOSUGGEST_LAST_HIGHLIGHT" ]; then
region_highlight=("${(@)region_highlight:#$_ZSH_AUTOSUGGEST_LAST_HIGHLIGHT}")
unset _ZSH_AUTOSUGGEST_LAST_HIGHLIGHT
fi
}
# If there's a suggestion, highlight it
_zsh_autosuggest_highlight_apply() {
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typeset -g _ZSH_AUTOSUGGEST_LAST_HIGHLIGHT
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if [ $#POSTDISPLAY -gt 0 ]; then
_ZSH_AUTOSUGGEST_LAST_HIGHLIGHT="$#BUFFER $(($#BUFFER + $#POSTDISPLAY)) $ZSH_AUTOSUGGEST_HIGHLIGHT_STYLE"
region_highlight+=("$_ZSH_AUTOSUGGEST_LAST_HIGHLIGHT")
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else
unset _ZSH_AUTOSUGGEST_LAST_HIGHLIGHT
fi
}