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23 lines
776 B
R
23 lines
776 B
R
#' @title Source Lines from a File
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#' @description Sources specific lines from a file
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#'
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#' @param file A character string giving the path to the file to be sourced.
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#' @param lines A numeric vector of line numbers to be sourced.
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#' @param ... Additional arguments to be passed to \code{\link{source}}.
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#'
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#' @return The result of \code{\link{source}}.
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#'
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#' @examples
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#' test_file <- tempfile(fileext = ".R")
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#' writeLines(c("# Line 1", "2+2", "# Line 3"), test_file)
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#' source_lines(test_file, 1:2, echo=TRUE)
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#'
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#' @export
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#' @seealso This function is borrowed from a
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#' [gist](https://gist.github.com/christophergandrud/1eb4e095974204b12af9)
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#' by christophergandrud.
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#'
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source_lines <- function(file, lines, ...) {
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source(textConnection(readLines(file)[lines]), ...)
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}
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