Safely export templates to file.

This is a simple wrapper function around as_utf8 and writeLines, letting users write their template strings to file without having to worry about file encodings. For more details on why UTF-8 encoding is necessary, check out Yihui Xie's post on the subject.

export_template(
  template,
  filename,
  sep = "",
  filename.is.string = TRUE,
  strip.carriage.returns = TRUE
)

Arguments

template	The template string to be written out
filename	The path to write the template to, passed to writeLines. Also accepts stdout (and likely other similar functions) with a warning.
sep	Separator to use between lines written, passed to writeLines. Defaults to no separator, as templates are generally already spaced appropriately.
filename.is.string	A logical value indicating whether or not the filename parameter is expected to be a string (that is, a character vector). Setting the value to FALSE disables the warning when a non-character argument is passed, but this is unsupported functionality.
strip.carriage.returns	A logical value indicating whether or not to strip carriage feed characters, should any exist. This preserves line spacing when writing out files originally written on Windows; otherwise writeLines appears to not recognize lines as ending with a newline and inserts one, resulting in 2x the number of line breaks as anticipated.

Value

Returns the input template invisibly.

Details

Note that this function is effectively the inverse of import_pattern -- export_template(import_pattern("out.txt"), "out.txt") should always result in an unchanged file, and exceptions to this rule would be considered bugs.

Examples

pattern_file <- tempfile("out", tempdir(), ".Rmd")
export_template("my sample pattern", pattern_file)