importFrom("tools",
  "file_ext", "file_path_sans_ext", "file_path_as_absolute", "texi2dvi")
importFrom("utils",
  "Sweave", "toLatex",
  "compareVersion", "packageVersion", "head", "tail",
  "read.table", "read.csv2", "write.table", "unzip", "zip", "browseURL",
  "combn")

importFrom("stats",
  "dist", "median", "na.omit", "quantile", "runif",
  "as.formula", "complete.cases", "setNames")
importFrom("graphics",
  "abline", "barplot", "hist", "par", "plot", "rect", "spineplot", "text",
  "axis", "mtext")
importFrom("grDevices",
  "gray", "hcl", "svg")

importFrom("base64enc",
  "base64decode", "base64encode", "dataURI")
importFrom("knitr",
  "knit", "opts_chunk", "opts_hooks", "render_sweave")
importFrom("rmarkdown",
  "pandoc_available", "pandoc_convert")

export(
  ## outdated version 1 interface
  "exams",

  ## formatters
  "mchoice2string",
  "string2mchoice",
  "mchoice2text",
  "answerlist",
  "round2",
  "fmt",
  "char_with_braces",
  "num2tol",
  "num_to_tol",
  "expar",

  ## mchoice/schoice generators
  "num2schoice",
  "num_to_schoice",
  "det2schoice",
  "det_to_schoice",
  "matrix2schoice",
  "matrix_to_schoice",
  "matrix2mchoice",
  "matrix_to_mchoice",

  ## version 2 extensible interface
  "xexams",
  "xweave",
  "exams_metainfo",
  "exams_eval",
  "exams_skeleton",
  "exams.skeleton",

  ## exercise reader and helper functions
  "read_exercise",
  "read_metainfo",
  "extract_command",
  "extract_extra",
  "extract_environment",
  "extract_items",
  "include_supplement",
  "include_tikz",
  "match_exams_call",
  "match_exams_device",
  "match_exams_iteration",

  ## stress testing,
  "stresstest_exercise",

  ## LaTeX to image converter (via ImageMagick's convert)
  "tex2image",

  ## modular PDF driver
  "exams2pdf",
  "make_exams_write_pdf",

  ## HTML driver
  "exams2html",
  "make_exercise_transform_html",
  "make_exercise_transform_pandoc",
  "make_exams_write_html",

  ## IMS QTI drivers
  "exams2qti12",
  "make_itembody_qti12",
  "exams2qti21",
  "make_itembody_qti21",
  "exams2openolat",
  "openolat_config",
  "exams2canvas",
  "exams2ilias",
  ## "exams2inspera",

  ## Blackboard driver (only partially QTI-based)
  "exams2blackboard",
  "make_itembody_blackboard",

  ## WU exam server driver (LOPS)
  "exams2lops",
  "make_exams_write_lops",

  ## mimicked WU exam server driver (NOPS)
  "exams2nops",
  "make_nops_template",
  "nops_scan",
  "nops_fix",
  "nops_eval",
  "nops_eval_write",
  "nops_language",

  ## Moodle driver
  "exams2moodle",
  "make_question_moodle",
  "make_question_moodle23",
  "moodle2exams",

  ## ARSnova/Particify driver
  "exams2arsnova",
  "make_exams_write_arsnova",
  "exams2particify",

  ## Kahoot! driver
  "exams2kahoot",

  ## TCExam driver
  "exams2tcexam",

  ## TestVision driver
  "exams2testvision",
  "make_itembody_testvision",
  "testvision2exams",
  
  ## Grasple driver
  "exams2grasple",
  "make_exams_write_grasple",

  ## Pandoc driver
  "exams2pandoc"
)

S3method("print", "exams_metainfo")
S3method("toLatex", "matrix")
S3method("toLatex", "data.frame")
S3method("plot", "stress")
S3method("as.data.frame", "stress")
S3method("print", "stress")
S3method("summary", "stress")
S3method("print", "stress.summary")
