| format_funusage {Rdpack} | R Documentation |
Format the usage text of functions
Description
Formats the usage text of a function so that each line contains no more than a given number of characters.
Usage
format_funusage(x, name = "", width = 72, realname)
Arguments
x |
a character vector containing one element for each argument of the function, see ‘Details’. |
name |
the name of the function whose usage is described, a string. |
width |
maximal width of each line of output. |
realname |
the printed form of |
Details
format_funusage formats the usage text of a function for
inclusion in Rd documentation files. If necessary, it splits the text
into more lines in order to fit it within the requested width.
Each element of argument x contains the text for one argument
of function name in the form arg or arg = default.
format_funusage does not look into the content of
x, it does the necessary pasting to form the complete usage
text, inserting new lines and indentation to stay within the specified
width. Elements of x are never split. If an argument (i.e.,
element of x) would cause the width to be exceeded, the entire
argument is moved to the following line.
The text on the second and subsequent lines of each usage item starts in the column just after the opening parenthesis which follows the name of the function on the first line.
In descriptions of S3 methods and S4 methods, argument name may
be a TeX macro like \method{print}{ts}. In that case the number
of characters in name has little bearing on the actual number
printed. In this case argument realname is used for counting
both the number of characters on the first line of the usage message
and the indentation for the subsequent lines.
Value
The formatted text as a length one character vector.
Note
Only the width of realname is used (for counting). The
formatted text contains name.
The width of strings is determined by calling nchar with
argument type set to "width".
Author(s)
Georgi N. Boshnakov
See Also
Examples
# this function is essentially internal,
# see deparse_usage1 and as.character.f_usage which use it.