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Get a tree of the package structure to help developers

get_package_structure() is a function that helps developers understand the package structure. It reads the dev/config_fusen.yaml file, adds the list of resulting functions and extra description of files.

You can know:

  • The description of the flat file as issued from its Title when exists
  • If the flat file is still active
  • The list of R files issued from the flat file
  • The list of functions inside these R files
  • The list of files of tests issued from the flat file
  • There is a possibility to list all functions that are called in the test files
  • The vignette issued from the flat file

With draw_package_structure(), you can draw a tree of the package structure in the console.
This also works for any R package, not only for fusen built packages.

#' \dontrun{
#' # This only works inside a 'fusen' built package
#' pkg_structure <- get_package_structure()
#' draw_package_structure(pkg_structure)
#' }
#'
#' # Example with a dummy package
dummypackage <- tempfile("drawpkg.structure")
dir.create(dummypackage)

# {fusen} steps
fill_description(pkg = dummypackage, fields = list(Title = "Dummy Package"))
dev_file <- suppressMessages(
  add_flat_template(pkg = dummypackage, overwrite = TRUE, open = FALSE)
)
flat_file <- dev_file[grepl("flat_", dev_file)]

usethis::with_project(dummypackage, {
  # Add an extra R file with internal function
  # to list in "keep"
  dir.create("R")
  cat("extra_fun <- function() {1}\n", file = "R/my_extra_fun.R")

  # Works with classical package
  pkg_structure <- get_package_structure()
  draw_package_structure(pkg_structure)
})
#>  Setting active project to
#> '/tmp/RtmpHDqHLp/drawpkg.structure191c53492a48'
#> ── No NAMESPACE file found there:  /tmp/RtmpHDqHLp/drawpkg.structure191c53492a48
#> ── keep ────────────────────────────────────────────────────────────────────────
#> 
#> - keep
#>   - path
#>       + keep
#>   - state
#>       + 🍏 active
#>   - R
#>     - R/my_extra_fun.R
#>       + 🙈 extra_fun
#>   - tests
#>   - vignettes
#>  Setting active project to '<no active project>'

usethis::with_project(dummypackage, {
  # Works with 'fusen' package
  suppressMessages(
    inflate(
      pkg = dummypackage, flat_file = flat_file,
      vignette_name = "Get started", check = FALSE,
      open_vignette = FALSE
    )
  )

  pkg_structure <- get_package_structure()
  draw_package_structure(pkg_structure)
})
#>  Setting active project to
#> '/tmp/RtmpHDqHLp/drawpkg.structure191c53492a48'
#> ── config file for dev/flat_full.Rmd ───────────────────────────────────────────
#> ── Reading NAMESPACE file ──────────────────────────────────────────────────────
#> ── flat_full.Rmd ───────────────────────────────────────────────────────────────
#> ── keep ────────────────────────────────────────────────────────────────────────
#> 
#> - flat_full.Rmd
#>   - flat_title
#>       + flat_full.Rmd for working package
#>   - path
#>       + dev/flat_full.Rmd
#>   - state
#>       + 🍏 active
#>   - R
#>     - R/my_median.R
#>       + 👀 my_median
#>     - R/my_other_median.R
#>       + 👀 my_other_median
#>       + 🙈 sub_median
#>   - tests
#>       + tests/testthat/test-my_median.R
#>       + tests/testthat/test-my_other_median.R
#>   - vignettes
#>       + vignettes/get-started.Rmd
#> - keep
#>   - path
#>       + keep
#>   - state
#>       + 🍏 active
#>   - R
#>     - R/my_extra_fun.R
#>       + 🙈 extra_fun
#>   - tests
#>   - vignettes
#>  Setting active project to '<no active project>'

Get the list of functions from a R file

file_path <- tempfile(fileext = ".R")
cat(
  "my_fun <- function() {1}",
  "my_fun2 <- function() {2}",
  sep = "\n",
  file = file_path
)
get_all_created_funs(file_path)
#> [1] "my_fun"  "my_fun2"