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#' @rdname toRMarkdown
#' @title toRMarkdown
#'
#' @description
#' Conversion to R Markdown.
#'
#' @param txt character: vector with lines of Moodle Markdown
#'
#' @return Lines with RMarkdown
#' @export
#'
#' @examples
#' txt <- c("[image]\n",
#' "Ein Paar hat 8 gute Bekannte, von denen die beiden 5 zum Essen einladen möchten.",
#' "Wie viele verschiedene Reihenfolgen des Eintreffens der eingeladenen 5 Gäste gibt es?\n",
#' ": 56",
#' "; 120",
#' "; 336",
#' "; 2002",
#' "; 6720",
#' "; 32768",
#' "; 40320",
#' "; Keine Antwort ist richtig")
#' toRMarkdown(txt)
toRMarkdown <- function(txt) {
txt <- gsub("\\[(.*?)\\]", "\\$\\1\\$", txt)
txt <- gsub("\\b\\_(.*?)\\_\\b", "\\*\\1\\*", txt)
txt <- gsub("\\n: ", "\n\n* ", txt)
txt <- gsub("\\n; ", "\n* ", txt)
# Find tables
txt <- gsub("\\n\\t\\t", "\\|@\\|", txt)
txt <- strsplit(txt, "\n")[[1]]
alphas <- strsplit(txt, "\\|@\\|")
nalpha <- lengths(alphas)
header <- 0
for (i in 1:length(nalpha)) {
if (nalpha[i]>1) {
if (header!=nalpha[i]) {
alphas[[i]][1] <- paste0("\n",
paste0(rep("| ", nalpha[i]-1), collapse=""), "|\n",
paste0(rep("|-:", nalpha[i]-1), collapse=""), "|\n")
alphas[[i]] <- paste0(paste0(alphas[[i]], collapse="|"), "|")
header <- nalpha[i]
} else {
alphas[[i]] <- paste0(paste0(alphas[[i]], collapse="|"), "|")
}
} else {
if (nalpha[i]==0) alphas[[i]] <- ''
header <- 0
}
}
# txt <- gsub("\\n\\t\\* ", "\n* ", txt)
paste0(unlist(alphas), collapse="\n")
}
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