function alias_if --description "Alias if a program exists"
  if test (count $argv) -lt 2
    return
  end
  if command -sq $argv[1]
    if test (count $argv) -gt 2
      alias $argv[2] "$argv[1] $argv[3..-1]"
    else
      alias $argv[2] "$argv[1]"
    end
  end
end

function alias_if_not --description "Alias if a program doesn't exist"
  if test (count $argv) -lt 2
    return
  end
  if not command -sq $argv[1]
    if test (count $argv) -gt 2
      alias $argv[1] "$argv[2] $argv[3..-1]"
    else
      alias $argv[1] "$argv[2]"
    end
  end
end

function find_prog --description "Find one or more programs in \$PATH"
  for prog in $argv
    for search_path in $PATH
      if test -x "$search_path/$prog"
        echo -n "$prog"
        return
      end
    end
  end
end