condition_message_linter {lintr}

Block usage of paste() and paste0() with messaging functions using ...

Description

This linter discourages combining condition functions like stop() with string concatenation functions paste() and paste0(). This is because

• stop(paste0(...)) is redundant as it is exactly equivalent to stop(...)

• stop(paste(...)) is similarly equivalent to stop(...) with separators (see examples)

The same applies to the other default condition functions as well, i.e., warning(), message(), and packageStartupMessage().

Usage

condition_message_linter()

Tags

best_practices, consistency

See Also

linters for a complete list of linters available in lintr.

Examples

# will produce lints
lint(
  text = 'stop(paste("a string", "another"))',
  linters = condition_message_linter()
)

lint(
  text = 'warning(paste0("a string", " another"))',
  linters = condition_message_linter()
)

# okay
lint(
  text = 'stop("a string", " another")',
  linters = condition_message_linter()
)

lint(
  text = 'warning("a string", " another")',
  linters = condition_message_linter()
)

lint(
  text = 'warning(paste("a string", "another", sep = "-"))',
  linters = condition_message_linter()
)