works on Windows

DESCRIPTION

@@ -1,28 +1,29 @@
 Package: wand
 Type: Package
 Title: Retrieve 'Magic' Attributes from Files and Directories
-Version: 0.1.0
-Date: 2016-08-12
+Version: 0.2.0
+Date: 2016-08-13
 Author: Bob Rudis (@hrbrmstr), Christos Zoulas [libmagic]
-Maintainer: Bob Rudis <bob@rudis.net>
+Maintainer: Bob Rudis <bob@rud.is>
 Description: The 'libmagic' library provides functions to determine
     mime type and other metadata from files through their "magic"
     attributes.
 URL: http://github.com/hrbrmstr/wand
 BugReports: https://github.com/hrbrmstr/wand/issues
-SystemRequirements: libmagic
+SystemRequirements: libmagic (>= 5.14)
 License: AGPL
 Suggests:
-    testthat,
-    tibble,
-    magrittr,
-    dplyr
+    testthat
 Depends:
     R (>= 3.0.0)
 Imports:
     purrr,
     Rcpp,
     rappdirs,
-    utils
+    tibble,
+    utils,
+    tidyr,
+    stringi,
+    dplyr
 LinkingTo: Rcpp
 RoxygenNote: 5.0.1

NAMESPACE

@@ -3,7 +3,12 @@
 export(incant)
 export(magic_wand_file)
 import(purrr)
+import(stringi)
+import(tibble)
+import(tidyr)
 importFrom(Rcpp,sourceCpp)
+importFrom(dplyr,left_join)
+importFrom(dplyr,mutate)
 importFrom(rappdirs,user_cache_dir)
 importFrom(utils,unzip)
 useDynLib(wand)

NEWS.md

@@ -1,2 +1,5 @@
-0.1.0 
+# 0.2.0
+* Works on Windows
+
+# 0.1.0 
 * Initial release

R/RcppExports.R

@@ -1,31 +1,8 @@
 # This file was generated by Rcpp::compileAttributes
 # Generator token: 10BE3573-1514-4C36-9D1C-5A225CD40393
 
-#' Retrieve 'magic' attributes from files and directories
-#'
-#' @param path character vector of files to use magic on
-#' @param magic_db either "\code{system}" (the default) to use the system
-#'   \code{magic} database or an atomic character vector with a
-#'   colon-separated list of full paths to custom \code{magic} database(s).
-#' @return a \code{tibble} / \code{data.frame} of file magic attributes.
-#'   Specifically, mime type, encoding, possible file extensions and
-#'   type description are returned as colums in the data frame along
-#'   with \code{path}.
-#' @note Various fields might not be available depending on the version
-#'   of \code{libmagic} you have installed.
-#' @references See \url{http://openpreservation.org/blog/2012/08/09/magic-editing-and-creation-primer/}
-#'   for information on how to create your own \code{magic} database
-#' @export
-#' @examples
-#' library(magrittr)
-#' library(dplyr)
-#'
-#' system.file("img", package="filemagic") %>%
-#'   list.files(full.names=TRUE) %>%
-#'   incant() %>%
-#'   glimpse()
-incant <- function(path, magic_db = "system") {
-    .Call('wand_incant', PACKAGE = 'wand', path, magic_db)
+incant_ <- function(path, magic_db = "system") {
+    .Call('wand_incant_', PACKAGE = 'wand', path, magic_db)
 }
 
 lib_version <- function() {

R/wand-package.R

@@ -4,8 +4,12 @@
 #' @docType package
 #' @author Bob Rudis (@@hrbrmstr)
 #' @import purrr
+#' @import tibble
+#' @import tidyr
+#' @import stringi
 #' @importFrom rappdirs user_cache_dir
 #' @useDynLib wand
 #' @importFrom Rcpp sourceCpp
 #' @importFrom utils unzip
+#' @importFrom dplyr mutate left_join
 NULL

R/wand.r

@@ -0,0 +1,76 @@
+#' Retrieve 'magic' attributes from files and directories
+#'
+#' @param path character vector of files to use magic on
+#' @param magic_db either "\code{system}" (the default) to use the system
+#'   \code{magic} database or an atomic character vector with a
+#'   colon-separated list of full paths to custom \code{magic} database(s).
+#' @return a \code{tibble} / \code{data.frame} of file magic attributes.
+#'   Specifically, mime type, encoding, possible file extensions and
+#'   type description are returned as colums in the data frame along
+#'   with \code{path}.
+#' @note Various fields might not be available depending on the version
+#'   of \code{libmagic} you have installed.
+#' @references See \url{http://openpreservation.org/blog/2012/08/09/magic-editing-and-creation-primer/}
+#'   for information on how to create your own \code{magic} database
+#' @export
+#' @examples
+#' library(magrittr)
+#' library(dplyr)
+#'
+#' system.file("img", package="filemagic") %>%
+#'   list.files(full.names=TRUE) %>%
+#'   incant() %>%
+#'   glimpse()
+incant <- function(path, magic_db="system") {
+
+  if (get_os() == "win") {
+
+    file_exe <- system.file("exec/file.exe", package="wand")
+
+    magic_db <- normalizePath(magic_wand_file())
+
+    tf <- tempfile()
+    writeLines(path, tf)
+
+    system2(file_exe,
+            c("--mime-type", "--mime-encoding", "--no-buffer", "--preserve-date",
+              '--separator "||"', sprintf('--magic-file "%s"', magic_db),
+              sprintf('--files-from "%s"', tf)),
+            stdout=TRUE) -> output_1
+
+    system2(file_exe,
+            c("--no-buffer", "--preserve-date", '--separator "||"',
+              sprintf('--magic-file "%s"', magic_db),
+              sprintf('--files-from "%s"', tf)),
+            stdout=TRUE) -> output_2
+
+    unlink(tf)
+
+    stri_split_fixed(output_1, "||", n=2, simplify=TRUE) %>%
+      as_data_frame() %>%
+      setNames(c("file", "response")) %>%
+      separate(response, c("mime_type", "encoding"), sep=";", extra="drop", fill="right") %>%
+      mutate(encoding=stri_replace_first_regex(encoding, "charset=", "")) -> df1
+
+    stri_split_fixed(output_2, "||", n=2, simplify=TRUE) %>%
+      as_data_frame() %>%
+      setNames(c("file", "description")) -> df2
+
+    left_join(df1, df2, by="file")
+
+  } else {
+    incant_(path, magic_db)
+  }
+}
+
+get_os <- function () {
+  if (.Platform$OS.type == "windows") {
+    "win"
+  } else if (Sys.info()["sysname"] == "Darwin") {
+    "mac"
+  } else if (.Platform$OS.type == "unix") {
+    "unix"
+  } else {
+    stop("Unknown OS")
+  }
+}

R/zzz.r

@@ -8,7 +8,7 @@
 #' perform the decompression unless \code{force} is \code{TRUE} or the
 #' cache directory has been cleared.
 #'
-#' @param force ensure the lastest copy of the pacakge "magic"
+#' @param refresh ensure the lastest copy of the pacakge "magic"
 #'   database is used.
 #' @export
 #' @examples
@@ -19,18 +19,19 @@
 #'   list.files(full.names=TRUE) %>%
 #'   incant(magic_wand_file()) %>%
 #'   glimpse()
-magic_wand_file <- function(force=FALSE) {
+magic_wand_file <- function(refresh=FALSE) {
 
   cache <- rappdirs::user_cache_dir("wandr")
 
-  if (!dir.exists(cache)) dir.create(cache, showWarnings=FALSE)
-  if (!dir.exists(cache)) return("system")
+  if (!dir.exists(cache)) dir.create(cache, recursive=TRUE, showWarnings=FALSE)
+  if (!dir.exists(cache)) return(NULL)
 
   if (lib_version() >= 528) vers <- "new" else vers <- "old"
+  if (get_os() == "win") vers <- "win"
 
-  if (!file.exists(file.path(rappdirs::user_cache_dir("wandr"), "magic.mgc"))) {
-    suppressWarnings(unzip(system.file("db", vers, "magic.mgc.zip", package="wand"),
-                           exdir=cache, overwrite=force))
+  if (refresh | (!file.exists(file.path(rappdirs::user_cache_dir("wandr"), "magic.mgc")))) {
+    unzip(system.file("db", vers, "magic.mgc.zip", package="wand"),
+                           exdir=cache, overwrite=TRUE)
   }
 
   file.path(rappdirs::user_cache_dir("wandr"), "magic.mgc")

README.Rmd

@@ -6,14 +6,14 @@ output: rmarkdown::github_document
 
 `wand` : Retrieve 'Magic' Attributes from Files and Directories
 
-The `libmagic` library must be installed and available to use this. 
+The `libmagic` library must be installed on *nix/macOS and available to use this. 
 
 - `apt-get install libmagic-dev` on Debian-ish systems
 - `brew install libmagic` on macOS
 
 While the package was developed using the 5.28 version of `libmagic` it has been configured to work with older versions. Note that some fields in the resultant data frame might not be available with older library versions. When using the function `magic_wand_file()` it checks for which version of `libmagic` is installed on your system and provides a suitable `magic.mgc` file for it.
 
-The package should also be pretty straightforward to get working on Windows. Assistance to do that is welcome. Think of all the fame and glory you'll receive!
+The package also works on Windows but it's a bit of a hack because, well, _Windows_. Seriously, folks, use a real operating system. The Windows version makes two `system2()` calls, so it's sub-optimal at best. Help to get it working in C would be greatly appreciated.
 
 The following functions are implemented:
 

README.md

@@ -3,14 +3,14 @@
 
 `wand` : Retrieve 'Magic' Attributes from Files and Directories
 
-The `libmagic` library must be installed and available to use this.
+The `libmagic` library must be installed on \*nix/macOS and available to use this.
 
 -   `apt-get install libmagic-dev` on Debian-ish systems
 -   `brew install libmagic` on macOS
 
 While the package was developed using the 5.28 version of `libmagic` it has been configured to work with older versions. Note that some fields in the resultant data frame might not be available with older library versions. When using the function `magic_wand_file()` it checks for which version of `libmagic` is installed on your system and provides a suitable `magic.mgc` file for it.
 
-The package should also be pretty straightforward to get working on Windows. Assistance to do that is welcome. Think of all the fame and glory you'll receive!
+The package also works on Windows but it's a bit of a hack because, well, *Windows*. Seriously, folks, use a real operating system. The Windows version makes two `system2()` calls, so it's sub-optimal at best. Help to get it working in C would be greatly appreciated.
 
 The following functions are implemented:
 
@@ -68,7 +68,7 @@ system.file("img", package="wand") %>%
 packageVersion("wand")
 ```
 
-    ## [1] '0.1.0'
+    ## [1] '0.2.0'
 
 ### Test Results
 
@@ -79,7 +79,7 @@ library(testthat)
 date()
 ```
 
-    ## [1] "Sat Aug 13 12:12:14 2016"
+    ## [1] "Sun Aug 14 18:36:44 2016"
 
 ``` r
 test_dir("tests/")

man/incant.Rd

@@ -1,5 +1,5 @@
 % Generated by roxygen2: do not edit by hand
-% Please edit documentation in R/RcppExports.R
+% Please edit documentation in R/wand.r
 \name{incant}
 \alias{incant}
 \title{Retrieve 'magic' attributes from files and directories}

man/magic_wand_file.Rd

@@ -4,10 +4,10 @@
 \alias{magic_wand_file}
 \title{Use the "magic" file that comes with the package}
 \usage{
-magic_wand_file(force = FALSE)
+magic_wand_file(refresh = FALSE)
 }
 \arguments{
-\item{force}{ensure the lastest copy of the pacakge "magic"
+\item{refresh}{ensure the lastest copy of the pacakge "magic"
 database is used.}
 }
 \description{

src/Makevars

@@ -1 +1,8 @@
-PKG_LIBS = -lmagic
+PKG_LIBS = -lmagic
+
+all: clean
+
+clean:
+	rm -f $(OBJECTS) wand.dll
+
+.PHONY: all clean

src/Makevars.win

@@ -0,0 +1,9 @@
+all: winlibs
+
+clean:
+	rm -f $(OBJECTS) wand.dll
+
+winlibs:
+	"${R_HOME}/bin${R_ARCH_BIN}/Rscript.exe" "../tools/getfile.R"
+
+.PHONY: all winlibs clean

src/RcppExports.cpp

@@ -5,15 +5,15 @@
 
 using namespace Rcpp;
 
-// incant
-DataFrame incant(CharacterVector path, std::string magic_db);
-RcppExport SEXP wand_incant(SEXP pathSEXP, SEXP magic_dbSEXP) {
+// incant_
+DataFrame incant_(CharacterVector path, std::string magic_db);
+RcppExport SEXP wand_incant_(SEXP pathSEXP, SEXP magic_dbSEXP) {
 BEGIN_RCPP
     Rcpp::RObject __result;
     Rcpp::RNGScope __rngScope;
     Rcpp::traits::input_parameter< CharacterVector >::type path(pathSEXP);
     Rcpp::traits::input_parameter< std::string >::type magic_db(magic_dbSEXP);
-    __result = Rcpp::wrap(incant(path, magic_db));
+    __result = Rcpp::wrap(incant_(path, magic_db));
     return __result;
 END_RCPP
 }

src/wand.cpp

@@ -1,34 +1,23 @@
 #include <Rcpp.h>
+
 using namespace Rcpp;
 
+#ifdef _WIN32
+#define WINDOWS
+#endif
+
+#ifdef _WIN64
+#define WINDOWS
+#endif
+
+#ifndef WINDOWS
 #include "magic.h"
 #include "limits.h"
+#endif
 
-//' Retrieve 'magic' attributes from files and directories
-//'
-//' @param path character vector of files to use magic on
-//' @param magic_db either "\code{system}" (the default) to use the system
-//'   \code{magic} database or an atomic character vector with a
-//'   colon-separated list of full paths to custom \code{magic} database(s).
-//' @return a \code{tibble} / \code{data.frame} of file magic attributes.
-//'   Specifically, mime type, encoding, possible file extensions and
-//'   type description are returned as colums in the data frame along
-//'   with \code{path}.
-//' @note Various fields might not be available depending on the version
-//'   of \code{libmagic} you have installed.
-//' @references See \url{http://openpreservation.org/blog/2012/08/09/magic-editing-and-creation-primer/}
-//'   for information on how to create your own \code{magic} database
-//' @export
-//' @examples
-//' library(magrittr)
-//' library(dplyr)
-//'
-//' system.file("img", package="filemagic") %>%
-//'   list.files(full.names=TRUE) %>%
-//'   incant() %>%
-//'   glimpse()
+#ifndef WINDOWS
 // [[Rcpp::export]]
-DataFrame incant(CharacterVector path, std::string magic_db="system") {
+DataFrame incant_(CharacterVector path, std::string magic_db="system") {
 
   unsigned int input_size = path.size();
 
@@ -149,6 +138,11 @@ DataFrame incant(CharacterVector path, std::string magic_db="system") {
   return(df);
 
 }
+#else
+DataFrame incant_(CharacterVector path, std::string magic_db="system") {
+  return(DataFrame::create());
+}
+#endif
 
 // [[Rcpp::export]]
 int lib_version() {

tools/getfile.R

@@ -0,0 +1,5 @@
+if(getRversion() < "3.3.0") setInternet2()
+download.file("https://www.stats.ox.ac.uk/pub/Rtools/goodies/file-5.03.zip", "file.zip", quiet = TRUE)
+dir.create("../inst/exec", showWarnings = FALSE)
+unzip("file.zip", "file.exe", exdir = "../inst/exec")
+unlink("file.zip")