download: Download File
In TAF: Transparent Assessment Framework for Reproducible Research

download

R Documentation

Download File

Description

Download a file in binary mode, e.g. a model executable.

Usage

download(url, dir = ".", mode = "wb", chmod = file_ext(url) == "",
  destfile = file.path(dir, basename(url)), quiet = TRUE, ...)

Arguments

`url`	URL of file to download.
`dir`	directory to download to.
`mode`	download mode, see details.
`chmod`	whether to set execute permission (default is `TRUE` if file has no filename extension).
`destfile`	destination path and filename (optional, overrides `dir`).
`quiet`	whether to suppress messages.
`...`	passed to `download.file`.

Details

With the default mode "wb" the file is downloaded in binary mode (see download.file), to prevent R from adding ⁠^M⁠ at line ends. This is particularly relevant for Windows model executables, while the chmod switch is useful when downloading Linux executables.

This function can be convenient for downloading any file, including text files. Data files in CSV or other text format can also be read directly into memory using read.table, read.taf or similar functions, without writing to the file system.

Value

No return value, called for side effects.

Note

If destfile contains a question mark it is removed from the destfile filename. Similarly, if destfile contains spaces or ‘%20’ sequences, those are converted to underscores.

In general, TAF scripts do not access the internet using download or similar functions. Instead, data and software are declared in DATA.bib and SOFTWARE.bib and then downloaded using taf.boot. The exception is when a boot script is used to fetch files from a web service (see TAF Wiki).

Examples

## Not run: 
url <- paste0("https://github.com/ices-taf/2015_had-iceg/raw/master/",
              "bootstrap/initial/software/catageysa/catageysa.exe")
download(url)

## End(Not run)

TAF documentation built on March 31, 2023, 6:51 p.m.