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function up-or-search -d "Depending on cursor position and current mode, either search backward or move up one line"
# If we are already in search mode, continue
if commandline --search-mode
commandline -f history-search-backward
return
end
# We are not already in search mode.
# If we are on the top line, start search mode,
# otherwise move up
set lineno (commandline -L)
switch $lineno
case 1
commandline -f history-search-backward
case '*'
commandline -f up-line
end
end
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