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