repo-helper.R

#' Create example repo for fledge demos
#'
#' @param open Whether to open the new project.
#' @param name Package name.
#' @param maintainer Name for DESCRIPTION and git.
#' @param email Email for DESCRIPTION and git.
#' @param date String of time for DESCRIPTION and git.
#' @param dir Directory within which to create the mock package folder.
#' @param news If TRUE, create a NEWS.md file.
#'
#' @return The path to the newly created mock package.
#' @export
#'
create_demo_project <- function(open = rlang::is_interactive(),
                                name = "tea",
                                maintainer = NULL,
                                email = NULL,
                                date = "2021-09-27",
                                dir = file.path(tempdir(), "fledge"),
                                news = FALSE) {
  if (is.null(maintainer)) {
    maintainer <- whoami::fullname(fallback = "Kirill M\u00fcller")
  }

  if (is.null(email)) {
    email <- whoami::email_address(fallback = "mail@example.com")
  }
  if (!dir.exists(dir)) dir.create(dir, recursive = TRUE)

  withr::local_options(usethis.quiet = TRUE)

  # https://github.com/r-lib/usethis/issues/1504
  if (Sys.getenv("IN_PKGDOWN") != "") {
    withr::local_options(cli.num_colors = 1)
  }

  set_usethis_desc(maintainer = maintainer, email = email, date = date)
  pkg <- usethis::create_package(
    file.path(dir, name),
    fields = list(Date = as.Date(date)),
    rstudio = TRUE,
    open = open
  )

  withr::local_dir(new = pkg)
  desc::desc_del("LazyData")
  gert::git_init()
  gert::git_config_set("user.name", maintainer)
  gert::git_config_set("user.email", email)
  gert::git_add(".")
  gert::git_commit(
    "First commit",
    author = default_gert_author(),
    committer = default_gert_committer()
  )
  current_branch <- gert::git_branch()
  if (current_branch != "main") {
    gert::git_branch_move(current_branch, "main")
    current_branch <- gert::git_branch()
  }
  # Setting the option as get_main_branch() will rely on it
  gert::git_config_set(name = "init.defaultbranch", value = "main")

  if (news) {
    news_lines <- c(
      news_preamble(), "",
      sprintf("# %s %s", name, as.character(desc::desc_get_version())), "",
      "* Added a `NEWS.md` file to track changes to the package."
    )
    brio::write_lines(news_lines, news_path())
    gert::git_add(news_path())
    gert::git_commit(
      "Add NEWS.md to track changes.",
      author = default_gert_author(),
      committer = default_gert_committer()
    )
  }

  return(pkg)
}


set_usethis_desc <- function(maintainer, email, date) {
  withr::local_options(
    usethis.full_name = maintainer,
    usethis.protocol = "ssh",
    usethis.description = list(
      "Authors@R" = utils::person(
        maintainer,
        email = email,
        role = c("aut", "cre"),
      ),
      Version = "0.0.0.9000",
      context = "fledge-example",
      RoxygenNote = "42"
    ),
    .local_envir = parent.frame(n = 2)
  )
}


#' Run code in temporary project
#'
#' @inheritParams create_demo_project
#' @inheritParams usethis::with_project
#' @param quiet Whether to show messages from usethis
#'
#' @return `with_demo_project()` returns the result of evaluating `code`.
#' @export
#'
#' @example man/examples/with_demo_project.R

with_demo_project <- function(code, dir = NULL, news = TRUE, quiet = FALSE) {
  local_demo_project(dir = dir, news = news, quiet = quiet)

  force(code)

  invisible()
}

#' @return `local_demo_project()` is called for its side effect and returns `NULL`, invisibly.
#' @rdname with_demo_project
#' @export
local_demo_project <- function(dir = NULL,
                               news = TRUE,
                               quiet = FALSE,
                               .local_envir = parent.frame()) {
  dir <- dir %||%
    withr::local_tempdir(pattern = "fledge", .local_envir = .local_envir)

  if (!dir.exists(dir)) {
    cli::cli_abort(c(x = "Can't find the directory {.file {dir}}."))
  }

  repo <- create_demo_project(dir = dir, news = news, open = FALSE)

  usethis::local_project(
    path = repo,
    quiet = quiet,
    .local_envir = .local_envir
  )

  invisible()
}