Interactive workflow

[jacobbien]

Currently if one pressed "Run all" in RStudio, one gets an error because usethis expects itself to be called from a package directory, but create-mypkg.Rmd lives in mypkg-project. One gets the error in the usethis::create_package() call and also in calls to usethis::use_package().

It'd be nice if "Run all" would work in Rstudio. Or if there's a simple alternative, e.g., a function like litr::load_all("create-mypkg.Rmd") that would load the current code into the console. At this point, I can think of two approaches for implementing litr::load_all():

1. It calls litr::render() and then devtools::load_all("mypkg/"). I don't love this approach because litr::render() can be slow and I'm hoping for something more immediate.
2. Use mockery to replace all usethis functions with stubs that don't do anything. I believe this should work but it might have some side-effects that I'm not thinking of.

It's also worth looking into what happens when one clicks "Run all" to see if one can do something like approach 2 before running all blocks.

[jacobbien]

Two workflow focused changes that don't directly involve RStudio:

litr::load_all("create-mypkg.Rmd") should create the package without creating a .html file (i.e., it doesn't run any of the code chunks, it only runs the hooks that create the R package. Then it calls devtools::load_all("mypkg/").

Another convenient function geared towards an easier workflow:

litr::render("create-mypkg.Rmd", test = FALSE, eval = FALSE)

The test=FALSE would mean that any code chunk that has test_that in it is not run. The eval=FALSE would mean that all code chunks are not run. This allows user to, for example, make changes to the text without rerunning everything.

[jacobbien]

An important modification of the above plan is that code chunks that call usethis commands will still need to be run for the package to be properly created. For example, usethis::create_package() and usethis::use_package() will need to be run.

[jacobbien]

This issue is closed by #38, which implements litr::load_all() and minimal_eval=TRUE as a possible setting for litr::render() and to output formats. The "Run All" issue described at the start of the issue is not directly addressed, but the need for it is, I believe, reduced. We can open a new issue about "Run All" if it still seems needed.