Merge branch 'r-0.0-6' into production

Author: krlmlr

DESCRIPTION

@@ -1,14 +1,15 @@
 Package: here
 Title: A Simpler Way to Find Your Files
-Version: 0.0-5
+Version: 0.0-6
 Authors@R: person("Kirill", "Müller", role = c("aut", "cre"), email = "krlmlr+r@mailbox.org")
 Description: Constructs paths to your project's files.
-Imports: rprojroot (>= 1.1)
+Imports: rprojroot (>= 1.2)
 License: GPL-3
 Encoding: UTF-8
 LazyData: true
-Date: 2016-10-29
+Date: 2017-01-16
 URL: https://github.com/krlmlr/here, http://krlmlr.github.io/here
 BugReports: https://github.com/krlmlr/here/issues
 Roxygen: list(markdown = TRUE)
 RoxygenNote: 5.0.1.9000
+Remotes: krlmlr/rprojroot@r-1.2

NAMESPACE

@@ -1,4 +1,6 @@
 # Generated by roxygen2: do not edit by hand
 
+export(dr_here)
 export(here)
+export(set_here)
 import(rprojroot)

NEWS.md

@@ -1,3 +1,11 @@
+## here 0.0-6 (2017-01-16)
+
+- New `set_here()` function that creates a `.here` file and talks about it by default (#1).
+- New `dr_here()`, describes why `here()` has settled for a particular path.
+- Recognize projectile projects and VCS roots.
+- Using working directory as fallback produces wrong results, reverted.
+
+
 ## here 0.0-5 (2016-10-29)
 
 - `remake` projects are also recognized by default.

R/here.R

@@ -1,28 +1,98 @@
 #' Find your files
 #'
-#' Uses a reasonable heuristics to find your project's files, based on the
-#' current working directory when the package is loaded.
+#' `here()` uses a reasonable heuristics to find your project's files, based on
+#' the current working directory at the time when the package is loaded.
+#' Use it as a drop-in replacement for [file.path()], it will always locate the
+#' files relative to your project root.
+#'
+#' This package is intended for interactive use only.
 #' Use [rprojroot::has_file()] or the other functions in
-#' the \pkg{rprojroot} package for more control.
+#' the \pkg{rprojroot} package for more control,
+#' or for package development.
+#'
+#' @evalRd format_root_section()
 #'
 #' @param ... \code{[character]}\cr
 #'   Path components below the project root, can be empty.
 #' @export
 #' @examples
 #' here()
+#' \dontrun{here("some/path/below/your/project/root.txt")}
 here <- function(...) {
   .root_env$f(...)
 }
 
+#' @rdname here
+#' @description `dr_here()` shows a message that by default also includes the
+#'   reason why `here()` is set to a particular directory.  Use this function
+#'   if `here()` gives unexpected results.
+#' @param show_reason \code{[logical(1)]}\cr
+#'   Include reason in output of `dr_here()`, defaults to `TRUE`.
+#' @export
+dr_here <- function(show_reason = TRUE) {
+  message(format_dr_here(show_reason = show_reason))
+}
+
+format_dr_here <- function(show_reason) {
+  root <- .root_env$f()
+  paste0(
+    "here() starts at ", root,
+    if (show_reason) {
+      paste0(", because it ", get_root_desc(.root_env$crit, root))
+    }
+  )
+}
+
+#' @rdname here
+#' @description `set_here()` creates an empty file named `.here`, by default
+#'   in the current directory.  When `here` encounters such a file, it uses the
+#'   directory that contains this file as root.  This is useful if none of the
+#'   default criteria apply.
+#' @param path \code{[character(1)]}\cr
+#'   Directory where to create `.here` file, defaults to the current directory.
+#' @param verbose \code{[logical(1)]}\cr
+#'   Verbose output, defaults to `TRUE`.
+#' @export
+set_here <- function(path = ".", verbose = TRUE) {
+  path <- normalizePath(path)
+  file_path <- file.path(path, ".here")
+
+  if (file.exists(file_path)) {
+    if (verbose) {
+      message("File .here already exists in ", path)
+    }
+  } else {
+    writeLines(character(), file_path)
+    if (verbose) {
+      message("Created file .here in ", path)
+    }
+  }
+
+  invisible(file_path)
+}
+
+is_here <- has_file(".here")
+
 .root_env <- new.env(parent = emptyenv())
 
 #' @import rprojroot
 .onLoad <- function(libname, pkgname) {
-  crit <- is_rstudio_project | is_r_package | is_remake_project | from_wd
-
-  .root_env$f <- crit$make_fix_file()
+  .root_env$crit <- is_here | is_rstudio_project | is_r_package | is_remake_project | is_projectile_project | is_vcs_root
+  .root_env$f <- .root_env$crit$make_fix_file()
 }
 
 .onAttach <- function(libname, pkgname) {
-  packageStartupMessage("here() starts at ", .root_env$f())
+  packageStartupMessage(format_dr_here(show_reason = FALSE))
+}
+
+format_root_section <- function() {
+  paste(
+    "\\section{Project root}{",
+    "Starting with the current working directory during package load time, `here` will walk the directory hierarchy upwards until it finds a directory that satisfies at least one of the following conditions:",
+    paste(format(.root_env$crit)[-1], collapse = "\n"),
+    "",
+    "Once established, the root directory doesn't change during the active R session. `here()` then appends the arguments to the root directory.",
+    "}",
+    sep = "\n"
+  )
 }