Build and Query R or Package News Information
Build and query the news for R or add-on packages.
news(query, package = "R", lib.loc = NULL, format = NULL, reader = NULL, db = NULL)
- an expression for selecting news entries
- a character string giving the name of an installed
add-on package, or
- a character vector of directory names of R libraries,
NULL. The default value of
NULLcorresponds to all libraries currently known.
- Not yet used.
- Not yet used.
- a news db obtained from
"R" (default), a news db is built with the
news since the 2.10.0 release of R (corresponding to R's top-level
NEWS file). Otherwise, if the given add-on package can be
found in the given libraries, it is attempted to read its news in
structured form from files inst/NEWS.Rd, NEWS or
inst/NEWS (in that order).
File inst/NEWS.Rd should be an Rd file given the entries as Rd
\itemize lists, grouped according to version using
section elements with names starting with a suitable prefix
(e.g, Changes in version followed by a space and the version
number, and optionally followed by a space and a parenthesized ISO
8601 (%Y-%m-%d, see
strptime) format date, and
possibly further grouped according to categories using
\subsection elements named as the categories.
The plain text NEWS files in add-on packages use a variety of different formats; the default news reader should be capable to extract individual news entries from a majority of packages from the standard repositories, which use (slight variations of) the following format:
- Entries are grouped according to version, with version header Changes in version at the beginning of a line, followed by a version number, optionally followed by an ISO 8601 format date, possibly parenthesized.
- Entries may be grouped according to category, with a category header (different from a version header) starting at the beginning of a line.
- Entries are written as itemize-type lists, using one of o, *, - or + as item tag. Entries must be indented, and ideally use a common indentation for the item texts.
Additional formats and readers may be supported in the future.
Package tools provides an (internal) utility function
news2Rd to convert plain text NEWS files to Rd. For
NEWS files in a format which can successfully be handled by the
default reader, package maintainers can use
"NEWS.Rd"), possibly with additional argument
codify = TRUE,
dir a character string specifying the path to a package's
root directory. Upon success, the NEWS.Rd file can further be
improved and then be moved to the inst subdirectory of the
package source directory.
The news db built is a character data frame inheriting from
"news_db" with variables
Text, where the last contains the entry texts
read, and the other variables may be
NA if they were missing or
could not be determined.
query, one can select news entries from the db. If
NULL, the complete db is returned. Otherwise,
query should be an expression involving (a subset of) the
Text, and when evaluated within the db returning a logical
vector with length the number of entries in the db. The entries for
which evaluation gave
TRUE are selected. When evaluating,
Date are coerced to
respectively, so that the comparison operators for these classes can
An data frame inheriting from class
## Build a db of all R news entries. db <- news() ## Bug fixes with PR number in 2.11.0. news(Version == "2.11.0" & grepl("^BUG", Category) & grepl("PR#", Text), db = db) ## Which categories have been in use? % R-core maybe should standardize a bit more sort(table(db[, "Category"]), decreasing = TRUE) ## Entries with version >= 2.10.1 (including "2.10.1 patched"): table(news(Version >= "2.10.1", db = db)$Version)