with_makevars: Makevars variables
Description
Temporarily change contents of an existing Makevars file.Usage
with_makevars(new, code, path = file.path("~", ".R", "Makevars"))Arguments
new
[named character]
New variables and their values
code
[any]
Code to execute in the temporary environment
path
[character(1)]
location of existing Makevars file to modify.
Value
[any]
The results of the evaluation of the code
argument.
Details
If no Makevars file exists or the fields in new do
not exist in the existing Makevars file then the fields are added to
the new file. Existing fields which are not included in new are
appended unchanged. Fields which exist in Makevars and in new
are modified to use the value in new.See Also
withr for examples