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To err is human - Alexander Pope (1711)
err is a light-weight R package to produce customizable
number and object sensitive error and warning messages.
The co functions produce object sensitive strings.
library(err)
fox <- c("The", "quick", "brown", "fox", "jumps", "over", "the", "lazy", "dog")
co(fox)
#> [1] "fox has 9 values: 'The', 'quick', 'brown', 'fox', 'jumps', 'over', 'the', 'lazy', 'dog'"
co(fox[1])
#> [1] "fox[1] has 1 value: 'The'"
co(fox[0])
#> [1] "fox[0] has 0 values"
co(fox, nlots = 5)
#> [1] "fox has 9 values: 'The', 'quick', 'brown', ..., 'dog'"The object sensitive strings are fully customized.
one <- "darn! the vector %o of length %n has the following value: %c"
none <- "phew! vector %o is empty"
some <- "rats! vector %o has the following %n element%s: %c"
lots <- "really?! the %n elements of vector %o are too numerous to print"
co(fox[0], one = one, none = none, some = some, lots = lots, nlots = 5)
#> [1] "phew! vector fox[0] is empty"
co(fox[1], one = one, none = none, some = some, lots = lots, nlots = 5)
#> [1] "darn! the vector fox[1] of length 1 has the following value: 'The'"
co(fox[1:3], one = one, none = none, some = some, lots = lots, nlots = 5)
#> [1] "rats! vector fox[1:3] has the following 3 elements: 'The', 'quick', 'brown'"
co(fox[1:5], one = one, none = none, some = some, lots = lots, nlots = 5)
#> [1] "really?! the 5 elements of vector fox[1:5] are too numerous to print"The following sprintf-like types can be used in the
custom messages:
%c: the object as a comma separated list (produced by a
cc function)%n: the length of the object%o: the name of the object%s: ‘s’ if n != 1 otherwise ’’%r: ‘are’ if n != 1 otherwise ‘is’And there are various formatting options
co(fox[1:6], conjunction = "or", bracket = "|", oxford = TRUE, ellipsis = 5)
#> [1] "fox[1:6] has 6 values: |The|, |quick|, |brown|, ..., or |over|"There is also a method for data frames.
cat(co(datasets::mtcars, conjunction = "and", oxford = TRUE, ellipsis = 5))
#> datasets::mtcars has 11 columns
#> mpg: 21, 21, 22.8, ..., and 21.4
#> cyl: 6, 6, 4, ..., and 4
#> disp: 160, 160, 108, ..., and 121
#> ...
#> and carb: 4, 4, 1, ..., and 2The cn function produces number sensitive customizable
messages
cn(0)
#> [1] "there are 0 values"
cn(1)
#> [1] "there is 1 value"
cn(2)
#> [1] "there are 2 values"
cn(100, lots = "there %r %n value%s - this is a lot")
#> [1] "there are 100 values - this is a lot"The co and cn functions can be combined
with the wrappers msg, wrn and
err to produce a message, warning and error (without the
call as part of the warning/error message).
msg(cn(2))
#> there are 2 values
wrn(cn(2))
#> Warning: there are 2 values
err(cn(2))
#> Error: there are 2 valuesTo install the latest release version from CRAN
install.packages("err")To install the latest development version from GitHub
if(!"devtools" %in% installed.packages()[,1])
install.packages("devtools")
devtools::install_github("poissonconsulting/err")To install the latest development version from the Poisson drat repository
if(!"drat" %in% installed.packages()[,1])
install.packages("drat")
drat::addRepo("poissonconsulting")
install.packages("err")Please report any issues.
Pull requests are always welcome.
Please note that this project is released with a Contributor Code of Conduct. By participating in this project you agree to abide by its terms.
These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.
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