devtools (version 1.1)

with_something: Execute code in temporarily altered environment.

Description

• in_dir: working directory
• with_collate: collation order
• with_envvar: environmental variables
• with_libpaths: library paths, replacing current libpaths
• with_lib: library paths, prepending to current libpaths
• with_locale: any locale setting
• with_options: options
• with_path: PATH environment variable
• with_par: graphics parameters

Usage

with_envvar(new, code)
  with_env(new, code)
  with_locale(new, code)
  with_collate(new, code)
  in_dir(new, code)
  with_libpaths(new, code)
  with_lib(new, code)
  with_options(new, code)
  with_par(new, code)
  with_path(new, code, add = TRUE)

Arguments

new

values for setting

code

code to execute in that environment

add

Combine with existing values? Currently for with_path only. If FALSE all existing paths are ovewritten, which don't you usually want.

Examples

getwd()
in_dir(tempdir(), getwd())
getwd()

Sys.getenv("HADLEY")
with_envvar(c("HADLEY" = 2), Sys.getenv("HADLEY"))
Sys.getenv("HADLEY")