#' @title Fast Reading and Processing of Common Gene Annotation and Next
#' Generation Sequencing Format Files.
#'
#' @description The \code{gread} package allows to read and process common
#' gene annotation and next generation sequencing file formats easily. It
#' currently supports:
#'
#' \itemize{
#' \item Gene Feature Format or \code{gff} using \code{rtracklayer} package,
#' \item Gene Transfer Format or \code{gtf} (also referred to as
#' \code{gff 2.5 at times}) using \code{rtracklayer} package,
#' \item Browser Extensible Data or \code{bed} format using the
#' \code{data.table} package.
#' \item Binary sequence Alignment/Map Format or \code{bam} format using
#' \code{GenomicAlignments} package.
#' }
#'
#' In addition, it also provides additional utility functions such as:
#'
#' \itemize{
#' \item Filling missing intron coordinates - \code{construct_introns},
#' \item Extracting particular features from gff/gtf files - \code{extract},
#' \item Extract non-overlapping features (e.g., \code{genes},
#' \code{introns}) etc. - \code{non_overlaps}
#' }
#'
#' @references \url{http://gmod.org/wiki/GFF3} \cr
#' \url{http://www.ensembl.org/info/website/upload/gff.html} \cr
#' \url{https://github.com/rdatatable/data.table} \cr
#' \url{https://bioconductor.org} \cr
#' @aliases gread gread-package
#' @docType package
#' @name gread
#' @importFrom tools file_ext
#' @importFrom stringi stri_split_regex
#' @import data.table
#' @import methods
#' @importFrom utils capture.output head packageVersion read.table tail
#' @importFrom stats na.omit
#' @importFrom Rsamtools ScanBamParam scanBamFlag scanBamHeader
#' @importFrom IRanges IRanges
#' @importMethodsFrom GenomicRanges disjoin reduce intersect findOverlaps
#' @importMethodsFrom GenomicRanges countOverlaps seqnames start end strand
#' @import GenomicFeatures
#' @importFrom GenomicAlignments findOverlaps summarizeOverlaps cigar qwidth
#' @importFrom GenomicAlignments readGAlignments readGAlignmentPairs
#' @importFrom GenomicAlignments width njunc rname
#' @importFrom S4Vectors queryHits subjectHits
#' @importMethodsFrom S4Vectors Rle mcols
#' @importFrom rtracklayer readGFF GFFcolnames
#' @seealso \code{\link{read_format}} \code{\link{read_gff}}
#' \code{\link{read_gtf}} \code{\link{read_bed}} \code{\link{read_bam}}
#' \code{\link{extract}} \code{\link{construct_introns}}
#' @keywords file
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