AlphaPipes: Named magrittr-style pipes

#' AlphaPipes: named magrittr-style pipes
#'
#' The package provides ``named pipes'' which may complement:
#' the \pkg{magrittr} package pipes. The named pipes make it possible
#' to use all lower-case and upper-case letters as the right-hand-side
#' placeholders for the values piped from the left-hand-side,
#' while the standard \pkg{magrittr}'s operator \code{\%>\%}
#' uses only a dot.
#'
#' When the package is loaded (via \code{library(AlphaPipes)})
#' the pipe operators (\code{\%a\%} ... \code{\%z\%} and \code{\%A\%} ... \code{\%Z\%})
#' are dynamically created in \pkg{AlphaPipes}' namespace.
#' So you cannot import them via \code{\%myoperator\% <- AlphaPipes::`\%a\%`}.
#' Anyway, such an import does not seem to make sense -- namespaced operators
#' e.g. \code{AlphaPipes::`\%a\%`} would be inconvenient -- too verbose,
#' while re-named named pipes e.g. \code{\%aa\%} as an alias for \code{\%a\%}
#' would be confusing
#' (since symbol \code{a} would need to be used on the right-hand side anyway).
#'
#' \pkg{AlphaPipes} needs package \pkg{clojR} which can be installed from GitHub:
#'
#' \code{devtools::install_github('alekrutkowski/clojR')}
#'
#' @examples
#' # Trivial:
#' 1:3 %A% mean(A)  # The same as mean(1:3) or 1:3 %>% mean
#' # Returns 2
#'
#' # Showing the actual usefulness - referring to earlier values
#' # from the piped flow:
#' data.frame(xx=1:5) %a%
#'     (dplyr::mutate(a, nnn = xx+10) %b%
#'          dplyr::rename(b, xx2 = xx) %b%
#'          cbind(b, a))
#' # Returns a data.frame:
#' #    xx2 nnn xx
#' #  1   1  11  1
#' #  2   2  12  2
#' #  3   3  13  3
#' #  4   4  14  4
# '#  5   5  15  5
#'
#' @docType package
#' @name AlphaPipes
NULL

for (L in c(letters, LETTERS))
    assign(paste0('%',L,'%'),
           eval(bquote(function(x,y)
               eval(bquote(clojR::`as->`(.(quote(.(x))),
                                         .(as.symbol(L)),
                                         .(quote(.(substitute(y))))))))))
rm(L)