fish-shell/share/functions/__fish_append.fish

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function __fish_append -d "Internal completion function for appending string to the commandline"
set separator $argv[1]
set -e argv[1]
set str (commandline -tc| sed -ne "s/\(.*$separator\)[^$separator]*/\1/p"|sed -e "s/--.*=//")
printf "%s\n" "$str"$argv "$str"(printf "%s\n" $argv|sed -e "s/\(\t\|\$\)/,\1/")
end