Package 'desc'

Description

Syntactical check of a DESCRIPTION field

Usage

check_field(x, warn = FALSE, ...)

Arguments

Value

TRUE if the field is syntactically correct, otherwise a character vector, containing one or multiple error messages.

Description

The DESCRIPTION fields that are supposed to be in plain ASCII encoding

Usage

cran_ascii_fields

Format

An object of class character of length 16.

See Also

Other field types: cran_valid_fields, dep_types

Description

A list of DESCRIPTION fields that are valid according to the CRAN checks

Usage

cran_valid_fields

Format

An object of class character of length 125.

See Also

Other field types: cran_ascii_fields, dep_types

Description

Currently it has the following ones: Imports, Depends, Suggests, Enhances and LinkingTo. See the Writing R Extensions manual for when to use which.

Usage

dep_types

Format

An object of class character of length 5.

See Also

Other field types: cran_ascii_fields, cran_valid_fields

Description

This is a convenience wrapper for description$new(). Very often you want to read an existing DESCRIPTION file, and to do this you can just supply the path to the file or its directory to desc().

Usage

desc(cmd = NULL, file = NULL, text = NULL, package = NULL)

Arguments

Examples

desc(package = "desc")
DESCRIPTION <- system.file("DESCRIPTION", package = "desc")
desc(DESCRIPTION)

Description

Add an author to Authors@R in DESCRIPTION

Usage

desc_add_author(
  given = NULL,
  family = NULL,
  email = NULL,
  role = NULL,
  comment = NULL,
  orcid = NULL,
  file = ".",
  normalize = FALSE
)

Arguments

See Also

Other Authors@R: desc_add_author_gh(), desc_add_me(), desc_add_orcid(), desc_add_role(), desc_change_maintainer(), desc_coerce_authors_at_r(), desc_del_author(), desc_del_role(), desc_get_authors(), desc_get_author(), desc_get_maintainer(), desc_set_authors()

Description

Uses the Authors@R field.

Usage

desc_add_author_gh(
  username,
  role = "ctb",
  comment = NULL,
  orcid = NULL,
  file = ".",
  normalize = FALSE
)

Arguments

Details

desc_add_author_gh is a convenience function, it adds the GitHub user as an author, and it needs the gh package to be installed. The full name is parsed using as.person and collapsing the given name and the family name in order to e.g. have the first and middle names together as given name. This approach might be limited to some full name structures.

See Also

Other Authors@R: desc_add_author(), desc_add_me(), desc_add_orcid(), desc_add_role(), desc_change_maintainer(), desc_coerce_authors_at_r(), desc_del_author(), desc_del_role(), desc_get_authors(), desc_get_author(), desc_get_maintainer(), desc_set_authors()

Description

Uses the Authors@R field.

Usage

desc_add_me(
  role = "ctb",
  comment = NULL,
  orcid = NULL,
  file = ".",
  normalize = FALSE
)

Arguments

Details

desc_add_me is a convenience function, it adds the current user as an author, and it needs the whoami package to be installed. It'll add your ORCID ID if you provide it as argument or save it as ORCID_ID environment variable in .Renviron. The full name is parsed using as.person and collapsing the given name and the family name in order to e.g. have the first and middle names together as given name. This approach might be limited to some full name structures.

See Also

Other Authors@R: desc_add_author_gh(), desc_add_author(), desc_add_orcid(), desc_add_role(), desc_change_maintainer(), desc_coerce_authors_at_r(), desc_del_author(), desc_del_role(), desc_get_authors(), desc_get_author(), desc_get_maintainer(), desc_set_authors()

Description

The author(s) can be specified by a combination of the given, family, email, comment and role fields. If multiple filters are specified, then all must match to identify the author(s).

Usage

desc_add_orcid(
  orcid,
  given = NULL,
  family = NULL,
  email = NULL,
  comment = NULL,
  role = NULL,
  file = ".",
  normalize = FALSE
)

Arguments

See Also

Other Authors@R: desc_add_author_gh(), desc_add_author(), desc_add_me(), desc_add_role(), desc_change_maintainer(), desc_coerce_authors_at_r(), desc_del_author(), desc_del_role(), desc_get_authors(), desc_get_author(), desc_get_maintainer(), desc_set_authors()

Description

Add locations in the Remotes field in DESCRIPTION

Usage

desc_add_remotes(remotes, file = ".", normalize = FALSE)

Arguments

Description

The author(s) can be specified by a combination of the given, family, email, comment and orcid fields. If multiple filters are specified, then all must match to identify the author(s).

Usage

desc_add_role(
  role,
  given = NULL,
  family = NULL,
  email = NULL,
  comment = NULL,
  orcid = NULL,
  file = ".",
  normalize = FALSE
)

Arguments

See Also

Other Authors@R: desc_add_author_gh(), desc_add_author(), desc_add_me(), desc_add_orcid(), desc_change_maintainer(), desc_coerce_authors_at_r(), desc_del_author(), desc_del_role(), desc_get_authors(), desc_get_author(), desc_get_maintainer(), desc_set_authors()

Description

Add one or more files to the Collate field, in DESCRIPTION

Usage

desc_add_to_collate(
  files,
  which = c("default", "all", "main", "windows", "unix"),
  file = ".",
  normalize = FALSE
)

Arguments

See Also

Other Collate field: desc_del_collate(), desc_del_from_collate(), desc_get_collate(), desc_set_collate()

Description

Add URLs to the URL field in DESCRIPTION

Usage

desc_add_urls(urls, file = ".", normalize = FALSE)

Arguments

Description

The which parameter specifies which component to increase. It can be a string referring to a component: major, minor, patch or dev, or an integer scalar, for the latter components are counted from one, and the beginning. I.e. component one is equivalent to major.

Usage

desc_bump_version(which, file = ".", normalize = FALSE)

Arguments

Details

If a component is bumped, then the ones after it are zeroed out. Trailing zero components are omitted from the new version number, but if the old version number had at least two or three components, then the one will also have two or three.

The bumping of the dev version (the fourth component) is special: if the original version number had less than four components, and the dev version is bumped, then it is set to 9000 instead of 1. This is a convention often used by R developers, it was originally invented by Winston Chang.

Both ⁠$set_version()⁠ and ⁠$bump_version()⁠ use dots to separate the version number components.

See Also

Other version numbers: desc_get_version(), desc_set_version()

Description

Only works with the Authors@R field.

Usage

desc_change_maintainer(
  given = NULL,
  family = NULL,
  email = NULL,
  comment = NULL,
  orcid = NULL,
  file = ".",
  normalize = FALSE
)

Arguments

Details

The current maintainer is kept if they have at least another role.

See Also

Other Authors@R: desc_add_author_gh(), desc_add_author(), desc_add_me(), desc_add_orcid(), desc_add_role(), desc_coerce_authors_at_r(), desc_del_author(), desc_del_role(), desc_get_authors(), desc_get_author(), desc_get_maintainer(), desc_set_authors()

Description

This simply means that the field is deleted.

Usage

desc_clear_remotes(file = ".", normalize = FALSE)

Arguments

Description

Remove all URLs from the URL field of DESCRIPTION

Usage

desc_clear_urls(file = ".", normalize = FALSE)

Arguments

Description

Convert the Author and Maintainer fields to Authors@R, which is necessary for other functions such as desc_get_authors().

Usage

desc_coerce_authors_at_r(file = ".", normalize = FALSE)

Arguments

Details

If the Authors@R field does not exist, desc_coerce_authors_at_r tries to parse the Author and Maintainer fields with utils::as.person() and writes them to the Authors@R field. Note that Author and Maintainer are free-form fields, so parsing them may fail.

See Also

Other Authors@R: desc_add_author_gh(), desc_add_author(), desc_add_me(), desc_add_orcid(), desc_add_role(), desc_change_maintainer(), desc_del_author(), desc_del_role(), desc_get_authors(), desc_get_author(), desc_get_maintainer(), desc_set_authors()

Description

Remove fields from a DESCRIPTION file

Usage

desc_del(keys, file = ".", normalize = FALSE)

Arguments

See Also

Other simple queries: desc_fields(), desc_get_field(), desc_get(), desc_has_fields(), desc_set()

Description

It uses the Authors@R field. The author(s) to be removed can be specified via any field(s). All authors matching all specifications will be removed. E.g. if only given = "Joe" is supplied, then all authors whole given name matches Joe will be removed. The specifications can be (PCRE) regular expressions.

Usage

desc_del_author(
  given = NULL,
  family = NULL,
  email = NULL,
  role = NULL,
  comment = NULL,
  orcid = NULL,
  file = ".",
  normalize = FALSE
)

Arguments

See Also

Other Authors@R: desc_add_author_gh(), desc_add_author(), desc_add_me(), desc_add_orcid(), desc_add_role(), desc_change_maintainer(), desc_coerce_authors_at_r(), desc_del_role(), desc_get_authors(), desc_get_author(), desc_get_maintainer(), desc_set_authors()

Description

Delete the Collate field from DESCRIPTION

Usage

desc_del_collate(
  which = c("all", "main", "windows", "unix"),
  file = ".",
  normalize = FALSE
)

Arguments

See Also

Other Collate field: desc_add_to_collate(), desc_del_from_collate(), desc_get_collate(), desc_set_collate()

Description

Remove a package dependency from DESCRIPTION

Usage

desc_del_dep(
  package,
  type = c("all", desc::dep_types),
  file = ".",
  normalize = FALSE
)

Arguments

See Also

Other dependencies: desc_del_deps(), desc_get_deps(), desc_has_dep(), desc_set_deps(), desc_set_dep()

Description

Remove all dependencies from DESCRIPTION

Usage

desc_del_deps(file = ".", normalize = FALSE)

Arguments

See Also

Other dependencies: desc_del_dep(), desc_get_deps(), desc_has_dep(), desc_set_deps(), desc_set_dep()

Description

Remove files from the Collate field.

Usage

desc_del_from_collate(
  files,
  which = c("all", "main", "windows", "unix"),
  file = ".",
  normalize = FALSE
)

Arguments

See Also

Other Collate field: desc_add_to_collate(), desc_del_collate(), desc_get_collate(), desc_set_collate()

Description

All locations matching the specified pattern are deleted.

Usage

desc_del_remotes(pattern, file = ".", normalize = FALSE)

Arguments

Description

The author(s) can be specified by a combination of the given, family, email, comment and orcid fields. If multiple filters are specified, then all must match to identify the author(s).

Usage

desc_del_role(
  role,
  given = NULL,
  family = NULL,
  email = NULL,
  comment = NULL,
  orcid = NULL,
  file = ".",
  normalize = FALSE
)

Arguments

See Also

Other Authors@R: desc_add_author_gh(), desc_add_author(), desc_add_me(), desc_add_orcid(), desc_add_role(), desc_change_maintainer(), desc_coerce_authors_at_r(), desc_del_author(), desc_get_authors(), desc_get_author(), desc_get_maintainer(), desc_set_authors()

Description

All URLs matching the specified pattern are deleted.

Usage

desc_del_urls(pattern, file = ".", normalize = FALSE)

Arguments

Description

List all fields in a DESCRIPTION file

Usage

desc_fields(file = ".")

Arguments

Value

Character vector of fields.

See Also

Other simple queries: desc_del(), desc_get_field(), desc_get(), desc_has_fields(), desc_set()

Description

Get a field from a DESCRIPTION file

Usage

desc_get(keys, file = ".")

Arguments

Value

Character vector, values of the specified keys. Non-existing keys return NA.

See Also

Other simple queries: desc_del(), desc_fields(), desc_get_field(), desc_has_fields(), desc_set()

Description

Query authors by role in Authors@R, in DESCRIPTION

Usage

desc_get_author(role = "cre", file = ".")

Arguments

Value

A person object, see utils::person().

See Also

Other Authors@R: desc_add_author_gh(), desc_add_author(), desc_add_me(), desc_add_orcid(), desc_add_role(), desc_change_maintainer(), desc_coerce_authors_at_r(), desc_del_author(), desc_del_role(), desc_get_authors(), desc_get_maintainer(), desc_set_authors()

Description

Query all authors in Authors@R, in DESCRIPTION

Usage

desc_get_authors(file = ".")

Arguments

Value

A person object, see utils::person().

See Also

Other Authors@R: desc_add_author_gh(), desc_add_author(), desc_add_me(), desc_add_orcid(), desc_add_role(), desc_change_maintainer(), desc_coerce_authors_at_r(), desc_del_author(), desc_del_role(), desc_get_author(), desc_get_maintainer(), desc_set_authors()

Description

If the file has no Built field then it throws an error.

Usage

desc_get_built(file = ".", normalize = FALSE)

Arguments

Value

A list with fields R, Platform, Date, OStype.

Description

Query the Collate field in DESCRIPTION

Usage

desc_get_collate(which = c("main", "windows", "unix"), file = ".")

Arguments

Value

Character vector of file names.

See Also

Other Collate field: desc_add_to_collate(), desc_del_collate(), desc_del_from_collate(), desc_set_collate()

Description

List all package dependencies from a DESCRIPTION file

Usage

desc_get_deps(file = ".")

Arguments

Value

Data frame with columns: type (dependency type), package, and version. For non-versioned dependencies version is *.

See Also

Other dependencies: desc_del_deps(), desc_del_dep(), desc_has_dep(), desc_set_deps(), desc_set_dep()

Description

desc_get_list() parses a comma separated list into a character vector.

Usage

desc_get_field(
  key,
  default = stop("Field '", key, "' not found"),
  trim_ws = TRUE,
  squish_ws = trim_ws,
  file = "."
)

desc_get_or_fail(keys, file = ".")

desc_get_list(
  key,
  default = stop("Field '", key, "' not found"),
  sep = ",",
  trim_ws = TRUE,
  squish_ws = trim_ws,
  file = "."
)

Arguments

Value

Character string, the value of key, or default if key is not found and default is specified.

See Also

Other simple queries: desc_del(), desc_fields(), desc_get(), desc_has_fields(), desc_set()

Description

Either from the Maintainer or the Authors@R field.

Usage

desc_get_maintainer(file = ".")

Arguments

Value

A character scalar.

See Also

Other Authors@R: desc_add_author_gh(), desc_add_author(), desc_add_me(), desc_add_orcid(), desc_add_role(), desc_change_maintainer(), desc_coerce_authors_at_r(), desc_del_author(), desc_del_role(), desc_get_authors(), desc_get_author(), desc_set_authors()

Description

List the locations in the Remotes field in DESCRIPTION

Usage

desc_get_remotes(file = ".")

Arguments

Value

A character vectors or remote locations. A length zero vector is returned if there is no Remotes field in the package.

Description

Query the URL field in DESCRIPTION

Usage

desc_get_urls(file = ".")

Arguments

Value

A character vectors or URLs. A length zero vector is returned if there is no URL field in the package.

Description

If the file has no Version field, or it is an invalid version string, then it throws an error.

Usage

desc_get_version(file = ".")

Arguments

Value

A base::package_version object.

See Also

Other version numbers: desc_bump_version(), desc_set_version()

Description

Check for a dependency

Usage

desc_has_dep(package, type = c("any", desc::dep_types), file = ".")

Arguments

Value

A logical scalar.

See Also

Other dependencies: desc_del_deps(), desc_del_dep(), desc_get_deps(), desc_set_deps(), desc_set_dep()

Description

Check if some fields are present in a DESCRIPTION file

Usage

desc_has_fields(keys, file = ".")

Arguments

Value

Logical vector.

See Also

Other simple queries: desc_del(), desc_fields(), desc_get_field(), desc_get(), desc_set()

Description

Re-formats and re-orders fields in DESCRIPTION in a standard way. Reorders the packages alphabetically.

Usage

desc_normalize(file = ".")

Arguments

See Also

Other repair functions: desc_reformat_fields(), desc_reorder_fields()

Description

Print the contents of a DESCRIPTION file to the screen

Usage

desc_print(file = ".")

Arguments

Description

Reformat the fields in DESCRIPTION in a standard way.

Usage

desc_reformat_fields(file = ".")

Arguments

See Also

Other repair functions: desc_normalize(), desc_reorder_fields()

Description

Reorder the fields in DESCRIPTION in a standard way.

Usage

desc_reorder_fields(file = ".")

Arguments

See Also

Other repair functions: desc_normalize(), desc_reformat_fields()

Description

Set one or more fields in a DESCRIPTION file

Usage

desc_set(..., check = TRUE, file = ".", normalize = FALSE)

desc_set_list(key, list_value, sep = ", ", file = ".", normalize = FALSE)

Arguments

Details

desc_set() supports two forms, the first is two unnamed arguments: the key and its value to set.

The second form requires named arguments: names are used as keys and values as values to set.

desc_set_list() collapses a character vector into string, separating the elements by commas.

See Also

Other simple queries: desc_del(), desc_fields(), desc_get_field(), desc_get(), desc_has_fields()

Description

Set authors in Authors@R, in DESCRIPTION

Usage

desc_set_authors(authors, file = ".", normalize = FALSE)

Arguments

See Also

Other Authors@R: desc_add_author_gh(), desc_add_author(), desc_add_me(), desc_add_orcid(), desc_add_role(), desc_change_maintainer(), desc_coerce_authors_at_r(), desc_del_author(), desc_del_role(), desc_get_authors(), desc_get_author(), desc_get_maintainer()

Description

Set the Collate field in DESCRIPTION

Usage

desc_set_collate(
  files,
  which = c("main", "windows", "unix"),
  file = ".",
  normalize = FALSE
)

Arguments

See Also

Other Collate field: desc_add_to_collate(), desc_del_collate(), desc_del_from_collate(), desc_get_collate()

Description

Add a package dependency to a DESCRIPTION file

Usage

desc_set_dep(
  package,
  type = desc::dep_types,
  version = "*",
  file = ".",
  normalize = FALSE
)

Arguments

See Also

Other dependencies: desc_del_deps(), desc_del_dep(), desc_get_deps(), desc_has_dep(), desc_set_deps()

Description

Set all package dependencies in DESCRIPTION

Usage

desc_set_deps(deps, file = ".", normalize = FALSE)

Arguments

See Also

Other dependencies: desc_del_deps(), desc_del_dep(), desc_get_deps(), desc_has_dep(), desc_set_dep()

Description

The specified locations replace the current ones. The Remotes field is created if it does not exist currently.

Usage

desc_set_remotes(remotes, file = ".", normalize = FALSE)

Arguments

Description

The specified urls replace the current ones. The URL field is created if it does not exist currently.

Usage

desc_set_urls(urls, file = ".", normalize = FALSE)

Arguments

Description

Both ⁠$set_version()⁠ and ⁠$bump_version()⁠ use dots to separate the version number components.

Usage

desc_set_version(version, file = ".", normalize = FALSE)

Arguments

See Also

Other version numbers: desc_bump_version(), desc_get_version()

Description

Returns the contents of the DESCRIPTION in LaTeX format.

Usage

desc_to_latex(file = ".")

Arguments

Description

This function is not implemented yet.

Usage

desc_validate(file = ".")

Arguments

Description

Read, write, update, validate DESCRIPTION files

Format

An R6 class.

Constructors

There are two ways of creating a description object. The first is reading an already existing DESCRIPTION file; simply give the name of the file as an argument. The default is DESCRIPTION:

x <- description$new()
x2 <- description$new("path/to/DESCRIPTION")

The second way is creating a description object from scratch, supply "!new" as an argument to do this.

x3 <- description$new("!new")

The complete API reference:

description$new(cmd = NULL, file = NULL, text = NULL,
    package = NULL)

• cmd: a command to create a description from scratch. Currently only "!new" is implemented. If it does not start with an exclamation mark, it will be interpreted as a file argument.

• file: name of the DESCRIPTION file to load. If it is a directory, then we assume that it is inside an R package and conduct a search for the package root directory, i.e. the first directory up the tree that contains a DESCRIPTION file. If cmd, file, text and package are all NULL (the default), then the search is started from the working directory. The file can also be an R package (source, or binary), in which case the DESCRIPTION file is extracted from it, but note that in this case ⁠$write()⁠ cannot write the file back in the package archive.

• text: a character scalar containing the full DESCRIPTION. Character vectors are collapsed into a character scalar, with newline as the separator.

• package: if not NULL, then the name of an installed package and the DESCRIPTION file of this package will be loaded.

Setting and Querying fields

Set a field with ⁠$set⁠ and query it with ⁠$get⁠:

x <- description$new("!new")
x$get("Package")
x$set("Package", "foobar")
x$set(Title = "Example Package for 'description'")
x$get("Package")

Note that ⁠$set⁠ has two forms. You can either give the field name and new value as two arguments; or you can use a single named argument, the argument name is the field name, the argument value is the field value.

The ⁠$fields⁠ method simply lists the fields in the object:

x$fields()

The ⁠$has_fields⁠ method checks if one or multiple fields are present in a description object:

x$has_fields("Package")
x$has_fields(c("Title", "foobar"))

The ⁠$del⁠ method removes the specified fields:

x$set(foo = "bar")
x$del("foo")

⁠$get_field⁠ is similar to ⁠$get⁠, but it queries a single field, it returns an unnamed vector if found, and returns the specified default value if not. By default it throws an error if the field is not found.

The complete API reference:

description$get(keys)
description$get_field(key, default, trim_ws = TRUE, squish_ws = trim_ws)
description$set(..., check = TRUE)
description$fields()
description$has_fields(keys)
description$del(keys)

• key: a character string (length one), the key to query.

• default: If specified and key is missing, this value is returned. If not specified, an error is thrown.

• trim_ws: whether to trim leading and trailing whitespace from the returned value.

• squish_ws: whether to reduce repeated whitespace in the returned value.

• keys: a character vector of keys to query, check or delete.

• ...: this must be either two unnamed arguments, the key and and the value to set; or an arbitrary number of named arguments, names are used as keys, values as values to set.

• check: A logical scalar. Whether to check the validity of the new values.

Normalizing

Format DESCRIPTION in a standard way. ⁠$str⁠ formats each field in a standard way and returns them (it does not change the object itself), ⁠$print⁠ is used to print it to the screen. The ⁠$normalize⁠ function normalizes each field (i.e. it changes the object). Normalization means reformatting the fields, via ⁠{$reformat_fields()⁠ and also reordering them via ⁠$reorder_fields()⁠. The format of the various fields is opinionated and you might like it or not. Note that desc only re-formats fields that it updates, and only on demand, so if your formatting preferences differ, you can still manually edit DESCRIPTION and desc will respect your edits.

description$str(by_field = FALSE, normalize = TRUE,
    mode = c("file", "screen"))
description$normalize()
description$reformat_fields()
description$reorder_fields()
description$print()

• by_field: whether to return the normalized format by field, or collapsed into a character scalar.

• normalize: whether to reorder and reformat the fields.

• mode: file mode formats the fields as they are written to a file with the write method. screen mode adds extra markup to some fields, e.g. formats the Authors@R field in a readable way.

Writing it to file

The ⁠$write⁠ method writes the description to a file. By default it writes it to the file it was created from, if it was created from a file. Otherwise giving a file name is compulsory:

x$write(file = "DESCRIPTION")

The API:

description$write(file = NULL)

• file: path to write the description to. If it was created from a file in the first place, then it is written to the same file. Otherwise this argument must be specified.

Version numbers

description$get_version()
description$set_version(version)
description$bump_version(which = c("patch", "minor", "major", "dev"))

• version: a string or a base::package_version object.

• which: which component of the version number to increase. See details just below.

These functions are simple helpers to make it easier to query, set and increase the version number of a package.

⁠$get_version()⁠ returns the version number as a base::package_version object. It throws an error if the package does not have a Version field.

⁠$set_version()⁠ takes a string or a base::package_version object and sets the Version field to it.

⁠$bump_version()⁠ increases the version number. The which parameter specifies which component to increase. It can be a string referring to a component: major, minor, patch or dev, or an integer scalar, for the latter components are counted from one, and the beginning. I.e. component one is equivalent to major.

If a component is bumped, then the ones after it are zeroed out. Trailing zero components are omitted from the new version number, but if the old version number had at least two or three components, then the one will also have two or three.

The bumping of the dev version (the fourth component) is special: if the original version number had less than four components, and the dev version is bumped, then it is set to 9000 instead of 1. This is a convention often used by R developers, it was originally invented by Winston Chang.

Both ⁠$set_version()⁠ and ⁠$bump_version()⁠ use dots to separate the version number components.

Dependencies

These functions handle the fields that define how the R package uses another R packages. See dep_types for the list of fields in this group.

The ⁠$get_deps⁠ method returns all declared dependencies, in a data frame with columns: type, package and version. type is the name of the dependency field, package is the name of the R package, and version is the required version. If no specific versions are required, then this is a "*".

The ⁠$set_deps⁠ method is the opposite of ⁠$get_deps⁠ and it sets all dependencies. The input is a data frame, with the same structure as the return value of ⁠$get_deps⁠.

The ⁠$has_dep⁠ method checks if a package is included in the dependencies. It returns a logical scalar. If type is not any, then it has to match as well.

The ⁠$del_deps⁠ method removes all declared dependencies.

The ⁠$set_dep⁠ method adds or updates a single dependency. By default it adds the package to the Imports field.

The API:

description$set_dep(package, type = dep_types, version = "*")
description$set_deps(deps)
description$get_deps()
description$has_dep(package, type = c("any", dep_types))
description$del_dep(package, type = c("all", dep_types))
description$del_deps()

• package: name of the package to add to or remove from the dependencies.

• type: dependency type, see dep_types. For ⁠$del_dep⁠ it may also be "all", and then the package will be deleted from all dependency types.

• version: required version. Defaults to "*", which means no explicit version requirements.

• deps: a data frame with columns type, package and version. ⁠$get_deps⁠ returns the same format.

Collate fields

Collate fields contain lists of file names with R source code, and the package has a separate API for them. In brief, you can use ⁠$add_to_collate⁠ to add one or more files to the main or other collate field. You can use ⁠$del_from_collate⁠ to remove it from there.

The API:

description$set_collate(files, which = c("main", "windows", "unix"))
description$get_collate(which = c("main", "windows", "unix"))
description$del_collate(which = c("all", "main", "windows", "unix"))
description$add_to_collate(files, which = c("default", "all", "main",
  "windows", "unix"))
description$del_from_collate(files, which = c("all", "main",
  "windows", "unix"))

• iles: the files to add or remove, in a character vector.

• ⁠which: which collate field to manipulate. ⁠"default"for$add_to_collate' means all existing collate fields, or the main one if none exist.

Authors

There is a specialized API for the Authors@R field, to add and remove authors, update their roles, change the maintainer, etc.

The API:

description$get_authors()
description$set_authors(authors)
description$get_author(role)
description$get_maintainer()
description$coerce_authors_at_r()

• authors: a person object, a list of authors.

• role: The role to query. See person for details.

⁠$get_authors⁠ returns a person object, the parsed authors. See utils::person() for details.

⁠$get_author⁠ returns a person object, all authors with the specified role.

⁠$get_maintainer⁠ returns the maintainer of the package. It works with Authors@R fields and with traditional Maintainer fields as well.

⁠$coerce_authors_at_r⁠ converts an Author field to one with a person object. This coercion may be necessary for other functions such as ⁠$get_authors⁠.

description$add_author(given = NULL, family = NULL, email = NULL,
    role = NULL, comment = NULL, orcid = NULL)
description$add_me(role = "ctb", comment = NULL, orcid = NULL)
description$add_author_gh(username, role = "ctb", comment = NULL, orcid = NULL)

Add a new author. The arguments correspond to the arguments of the utils::person() function. add_me is a convenience function, it adds the current user as an author, and it needs the whoami package to be installed. It'll add your ORCID ID if you provide it as argument or save it as ORCID_ID environment variable in .Renviron. The full name is parsed by add_me and add_author_gh using as.person and collapsing the given name and the family name in order to e.g. have the first and middle names together as given name. This approach might be limited to some full name structures.

description$del_author(given = NULL, family = NULL, email = NULL,
    role = NULL, comment = NULL, orcid = NULL)

Remove an author, or multiple authors. The author(s) to be removed can be specified via any field(s). All authors matching all specifications will be removed. E.g. if only given = "Joe" is supplied, then all authors whole given name matches Joe will be removed. The specifications can be (PCRE) regular expressions.

description$add_role(role, given = NULL, family = NULL, email = NULL,
    comment = NULL, orcid = NULL)
description$add_orcid(orcid, given = NULL, family = NULL, email = NULL,
    comment = NULL, role = NULL)
description$del_role(role, given = NULL, family = NULL, email = NULL,
    comment = NULL, orcid = NULL)
description$change_maintainer(given = NULL, family = NULL,
    email = NULL, comment = NULL, orcid = NULL)

role is the role to add or delete. The other arguments are used to select a subset of the authors, on which the operation is performed, similarly to ⁠$del_author⁠.

URLs

We provide helper functions for manipulating URLs in the URL field:

description$get_urls()
description$set_urls(urls)
description$add_urls(urls)
description$del_urls(pattern)
description$clear_urls()

• urls: character vector of URLs to set or add.

• pattern: Perl compatible regular expression to specify the URLs to be removed.

⁠$get_urls()⁠ returns all urls in a character vector. If no URL fields are present, a zero length vector is returned.

⁠$set_urls()⁠ sets the URL field to the URLs specified in the character vector argument.

⁠$add_urls()⁠ appends the specified URLs to the URL field. It creates the field if it does not exists. Duplicate URLs are removed.

⁠$del_urls()⁠ deletes the URLs that match the specified pattern.

⁠$clear_urls()⁠ deletes all URLs.

Remotes

devtools, remotes and some other packages support the non-standard Remotes field in DESCRIPTION. This field can be used to specify locations of dependent packages: GitHub or BitBucket repositories, generic git repositories, etc. Please see the ⁠Package remotes⁠ vignette in the devtools package.

desc has helper functions for manipulating the Remotes field:

description$get_remotes()
description$get_remotes()
description$set_remotes(remotes)
description$add_remotes(remotes)
description$del_remotes(pattern)
description$clear_remotes()

• remotes: character vector of remote dependency locations to set or add.

• pattern: Perl compatible regular expression to specify the remote dependency locations to remove.

⁠$get_remotes()⁠ returns all remotes in a character vector. If no URL fields are present, a zero length vector is returned.

⁠$set_remotes()⁠ sets the URL field to the Remotes specified in the character vector argument.

⁠$add_remotes()⁠ appends the specified remotes to the Remotes field. It creates the field if it does not exists. Duplicate remotes are removed.

⁠$del_remotes()⁠ deletes the remotes that match the specified pattern.

⁠$clear_remotes()⁠ deletes all remotes.

Built

The Built field is used in binary packages to store information about when and how a binary package was built.

⁠$get_built()⁠ returns the built information as a list with fields R, Platform, Date, OStype. It throws an error if the package does not have a Built field.

Encodings

When creating a description object, desc observes the Encoding field, if present, and uses the specified encoding to parse the file. Internally, it converts all fields to UTF-8.

When writing a description object to a file, desc uses the Encoding field (if present), and converts all fields to the specified encoding.

We suggest that whenever you need to use non-ASCII characters in your package, you use the UTF-8 encoding, for maximum portability.

Examples

## Create a template
desc <- description$new("!new")
desc

## Read a file
desc2 <- description$new(file = system.file("DESCRIPTION",
                           package = "desc"))
desc2

## Remove a field
desc2$del("LazyData")

## Add another one
desc2$set(VignetteBuilder = "knitr")
desc2$get("VignetteBuilder")
desc2