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#' Concatenate \code{"xifti"}s
#'
#' Concatenate \code{"xifti"} objects along the columns. They must have the same
#' brainstructures and resolutions. The first \code{"xifti"}'s metadata will be
#' retained, including its intent.
#'
#' @param ...,xifti_list Provide as arguments the \code{"xifti"}s to
#' concatenate, OR the single argument \code{xifti_list} which should be a
#' list of \code{"xifti"}s. (If \code{xifti_list} is provided all other
#' inputs will be ignored.)
#'
#' @return The concatenated \code{"xifti"}
#'
#' @family manipulating xifti
#' @export
merge_xifti <- function(..., xifti_list=NULL) {
if (is.null(xifti_list)) { xifti_list <- list(...) }
if (!all(vapply(xifti_list, is.xifti, FALSE, messages=FALSE))) {
stop("At least one input was not a `'xifti'`.")
}
xifti_out <- xifti_list[[1]]
L <- length(xifti_list)
for (bs in names(xifti_out$data)) {
bs_sizes <- unique(vapply(xifti_list, function(x){ifelse(is.null(x$data[[bs]]), 0, nrow(x$data[[bs]]))}, 0))
if (length(bs_sizes) > 1) { stop(bs, " dims are not identical across the `'xifti'`.") }
if (bs_sizes > 0) { xifti_out$data[[bs]] <- do.call(cbind, lapply(xifti_list, function(x){x$data[[bs]]})) }
}
# Check names.
xifti_names <- lapply(xifti_list, function(x){x$meta$cifti$names})
if (!all(vapply(xifti_names, is.null, FALSE))) {
for (ii in seq(L)) {
if (is.null(xifti_list[[ii]]$meta$cifti$names)) {
xifti_list[[ii]]$meta$cifti$names <- rep("", ncol_xifti(xifti_list[[ii]]))
}
}
if (is.null(xifti_out$meta$cifti$intent) || xifti_out$meta$cifti$intent != 3002) {
xifti_out$meta$cifti$names <- do.call(c, lapply(xifti_list, function(x){x$meta$cifti$names}))
} else {
# Will overwrite if this component already exists...
xifti_out$meta$cifti$misc$names <- do.call(c, lapply(xifti_list, function(x){x$meta$cifti$names}))
}
}
# Check labels.
# A mixture of label & non-label xiftis shouldn't happen anyway, since the medial
# wall is typically masked out for non-label xiftis but not in label xiftis.
xifti_labels <- lapply(xifti_list, function(x){x$meta$cifti$labels})
if (!all(vapply(xifti_labels, is.null, FALSE))) {
for (ii in seq(L)) {
if (is.null(xifti_list[[ii]]$meta$cifti$labels)) {
xifti_list[[ii]]$meta$cifti$labels <- rep(list(NULL), ncol(xifti_list[[ii]]))
}
}
if (is.null(xifti_out$meta$cifti$intent) || xifti_out$meta$cifti$intent == 3007) {
xifti_out$meta$cifti$labels <- do.call(c, lapply(xifti_list, function(x){x$meta$cifti$labels}))
} else {
# Will overwrite if this component already exists...
xifti_out$meta$cifti$misc$labels <- do.call(c, lapply(xifti_list, function(x){x$meta$cifti$labels}))
}
}
xifti_out
}
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