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15 lines
654 B
Fish
15 lines
654 B
Fish
function __maybe_set --description "Either appends or prepends to a variable if the file or directory exists and isn't already present"
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# Replicate some of the `set` args
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argparse 'a/append' 'p/prepend' 'x/export' 'g/global' -- $argv
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if [ (count $argv) -ne 2 ]
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echo "_maybe_set Requires exactly two arguments"
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return 1
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end
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set -l var_name "$argv[1]"
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set -l existing_val (eval 'echo $'(echo $var_name))
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set -l new_value "$argv[2]"
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if not contains -- "$new_value" "$existing_val" ;and test -e "$new_value"
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set $_flag_append $_flag_prepend $_flag_export $_flag_global $var_name $new_value
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end
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end
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