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function fish_commandline_prepend --description "Prepend the given string to the command-line, or remove the prefix if already there"
if not commandline | string length -q
commandline -r $history[1]
end
set -l process (commandline -p | string collect)
set -l to_prepend "$argv[1] "
if string match -qr '^ ' "$process"
set to_prepend " $argv[1]"
end
set -l length_diff (string length -- "$to_prepend")
set -l cursor_location (commandline -pC)
set -l escaped (string escape --style=regex -- $to_prepend)
if set process (string replace -r -- "^$escaped" "" $process)
commandline --replace -p -- $process
set length_diff "-$length_diff"
else
commandline -pC 0
commandline -pi -- "$to_prepend"
end
commandline -pC (math "max 0,($cursor_location + $length_diff)")
end
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