withr
Run Code 'With' Temporarily Modified Global State
A set of functions to run code 'with' safely and temporarily modified global state. Many of these functions were originally a part of the 'devtools' package, this provides a simple package with limited dependencies to provide access to these functions.
A set of functions to run code 'with' safely and temporarily modified global state.
Many of these functions were originally a part of the devtools package, this provides a simple package with limited dependencies to provide access to these functions.
with_collate()- collation orderwith_dir()- working directorywith_envvar()- environment variableswith_libpaths()- library pathswith_locale()- any locale settingwith_makevars()- Makevars variableswith_options()- optionswith_par()- graphics parameterswith_path()- PATH environment variable
There is also a with_() function to construct new with_* functions if needed.
dir.create("test")getwd()#> [1] "/tmp/RtmpaPrDI5"with_dir("test", getwd())#> [1] "/tmp/RtmpaPrDI5/test"getwd()#> [1] "/tmp/RtmpaPrDI5"unlink("test") Sys.getenv("HADLEY")#> [1] ""with_envvar(c("HADLEY" = 2), Sys.getenv("HADLEY"))#> [1] "2"Sys.getenv("HADLEY")#> [1] "" with_envvar(c("A" = 1), with_envvar(c("A" = 2), action = "suffix", Sys.getenv("A")))#> [1] "1 2"
See Also
News
1.0.2
with_makevars()gains anassignmentargument to allow specifying additional assignment types.
1.0.1
- Relaxed R version requirement to 3.0.2 (#35, #39).
- New
with_output_sink()andwith_message_sink()(#24).
1.0.0
First Public Release