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A helper function that downloads a file only if it does not already exist. If the file already exists, a message is shown (if desired).

download_only_if_missing.Rd

A helper function that downloads a file only if it does not already exist. If the file already exists, a message is shown (if desired).

Usage

download_only_if_missing(
  save_file_name,
  git_full_path,
  mode = "wb",
  show_existing_file_message = FALSE,
  show_nonexistent_file_message = FALSE
)

Arguments

save_file_name

The name of the file to save the downloaded file as.

git_full_path

The full path to the file on GitHub.

mode

A character indicating the mode with which to write the file. Useful values are "w", "wb" (binary), "a" (append) and "ab". Not used for methods "wget" and "curl". See also ‘Details’, notably about using "wb" for Windows. See download.file() mode argument.

show_existing_file_message

A logical indicating whether to show a warning message if the file already exists.

show_nonexistent_file_message

A logical indicating whether to show a message when downloading a file that does not already exist.

Examples

 # Download a file if it doesn't already exist
 if (FALSE) download_only_if_missing("homework_-1.Rmd",
 "https://raw.githubusercontent.com/your_github_username/your_repo_name/main/ClassMaterial/homework/homework_-1/homework_-1.Rmd") # \dontrun{}