zsh-autosuggestions/src/suggestion.zsh

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#--------------------------------------------------------------------#
# Suggestion #
#--------------------------------------------------------------------#
# Get a suggestion from history that matches a given prefix
_zsh_autosuggest_suggestion() {
local prefix="$(_zsh_autosuggest_escape_command_prefix "$1")"
# Get all history items (reversed) that match pattern $prefix*
local history_matches
history_matches=(${(j:\0:s:\0:)history[(R)$prefix*]})
# Echo the first item that matches
echo -E "$history_matches[1]"
}
_zsh_autosuggest_escape_command_prefix() {
setopt localoptions EXTENDED_GLOB
# Escape special chars in the string (requires EXTENDED_GLOB)
echo -E "${1//(#m)[\\()\[\]|*?]/\\$MATCH}"
}