without-trailing.fish: removes a pattern from the end of strings

gistpkg.zpl

name = without-trailing

author = Chris Olstrom

license = MIT

provides = fish/functions/without-trailing

requires
    command/sed
    fish/builtin/end
    fish/builtin/function
    fish/builtin/if
    fish/builtin/return
    fish/builtin/string
    fish/functions/empty
    fish/functions/errno
    fish/functions/usage

without-trailing.fish

function without-trailing --argument string
    if empty "$string"
        usage without-trailing '<string>'
        return (errno EINVAL)
    end

    sed -E "s/$string\$//"
end

In fish >= 2.3.0 this can be done with string trim --right --chars "$string" or string replace --regex "$string\$" ''