R/f_wrap.R

#' Wrap Strings
#'
#' Wrap strings by splitting n width, and paste collapsing with new line
#' characters.
#'
#' @param x A vector of text strings.
#' @param width A positive integer giving the target column for wrapping lines
#' in the output.
#' @param sep A new line separator (defaults to \code{"\\n"}.
#' @param exdent A non-negative integer specifying the indentation of subsequent
#' lines in paragraphs.
#' @param indent A non-negative integer giving the indentation of the first line
#' in a paragraph.
#' @param equal.lines logical.  If \code{TRUE} the number of lines for each
#' element will be made the same by appending additional '\\n' to those below
#' the max number of lines.  This is useful for legend spacing.
#' @param collapse logical. If \code{TRUE} then \code{x} is collapsed via
#' \code{paste(x, collapse = ' ')} before processing.  This is useful for
#' muti-line text wrapping of longer subtitles.
#' @param \ldots Other arguments passed to \code{\link[base]{strwrap}}.
#' @return Returns a string vector with wrapped new line characters.
#' @rdname f_wrap
#' @export
#' @seealso \code{\link[base]{strwrap}}
#' @examples
#' cat(f_wrap('really long label names are the pits'))
#' cat(f_wrap('really long label names are the pits', width = 20, exdent = 2))
#' f_wrap(c('really long label names are the pits and make us sad',
#'     'not nearly so long'), equal.lines = TRUE)
#'
#' \dontrun{
#' library(tidyverse); library(gridExtra)
#'
#' set.seed(10)
#' dat <- data_frame(
#'     level = c('Not Involved', 'Somewhat Involved Single Group',
#'         'Somewhat Involved Multiple Groups', 'Very Involved One Group',
#'         'Very Involved Multiple Groups'
#'     ),
#'     n = sample(1:10, length(level))
#' ) %>%
#'     mutate(
#'         level = factor(level, levels = unique(level)),
#'         `%` = n/sum(n)
#'     )
#'
#' gridExtra::grid.arrange(
#'     dat %>%
#'         ggplot(aes(level, `%`)) +
#'             geom_col() +
#'             labs(title = 'Yucky Labels', y = NULL),
#'
#'     dat %>%
#'         ggplot(aes(level, `%`)) +
#'             geom_col() +
#'             scale_x_discrete(labels = f_wrap) +
#'             scale_y_continuous(labels = ff_prop2percent(digits = 0)) +
#'             labs(title = 'Happy Labels', y = NULL),
#'
#'     ncol = 1, heights = c(.45, .55)
#' )
#'
#' }
f_wrap <- function (x, width = 15, sep = '\n', exdent = 0, indent = 0,
    equal.lines = FALSE, collapse = FALSE, ...) {

    nas <- is.na(x)

    if (isTRUE(equal.lines)) {
        out <- lapply(x, function(y) {

                strwrap(y, width = width, exdent = exdent, indent = indent, ...)

        })

        lens <- unlist(lapply(out, length))
        ml <- max(lens)
        out <- unlist(Map(function(i, x) paste(c(paste(x, collapse = sep), rep(sep, ml - i)), collapse = ''), lens, out))
    } else {

        if (isTRUE(collapse)) x <- paste(x, collapse = " ")
        out <- unlist(lapply(x, function(y) {
                paste(strwrap(y, width = width, exdent = exdent, indent = indent, ...), collapse = sep)

        }))
        if (isTRUE(collapse)) return(out)
    }

    out[nas] <- NA
    out

}



#' @export
#' @include utils.R
#' @rdname f_wrap
ff_wrap <- functionize(f_wrap)

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numform documentation built on May 2, 2019, 6:31 a.m.