Program/LoadPackage.R at master · DMZakaria/Program · GitHub

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#################################################################################################
# Name of file           LoadPackage.R                                                          #
# Creation Date          05/03/2014                                                             #
# last modification      20/03/2014                                                             #
# Version                1.0                                                                    #
# @Description           this small @method is created to Install and load package automaticlly #
# @method                /*install packages : install_pkgs */                                   #
# @parameter             /*Name of package*/                                                    #
# @author                Djedou Zakaria                                                         #
#################################################################################################


install_pkgs <- function(pkgs) {
  pkgs_miss <- pkgs[which(!pkgs %in% installed.packages()[, 1])]
  if (length(pkgs_miss) > 0) {
    install.packages(pkgs_miss)
  }

  if (length(pkgs_miss) == 0) {
    message("\n ...Packages were already installed!\n")
  }

  # install packages not already loaded:
  pkgs_miss <- pkgs[which(!pkgs %in% installed.packages()[, 1])]
  if (length(pkgs_miss) > 0) {
    install.packages(pkgs_miss,dependencies=TRUE)
  }

  # load packages not already loaded:
  attached <- search()
  attached_pkgs <- attached[grepl("package", attached)]
  need_to_attach <- pkgs[which(!pkgs %in% gsub("package:", "", attached_pkgs))]

  if (length(need_to_attach) > 0) {
    for (i in 1:length(need_to_attach)) require(need_to_attach[i], character.only = TRUE)
  }

  if (length(need_to_attach) == 0) {
    message("\n ...Packages were already loaded!\n")
  }
}

install_pkgs(("RODBC"))