[R-package] Fix build_r.R failing in Windows (#1694)

* Fix #1693

* Fix spacing

* Fr -> For

* Recursive causes error on strict R environments

build_r.R

-# for macOS users who have decided to use gcc
+# For macOS users who have decided to use gcc
 # (replace 8 with version of gcc installed on your machine)
 # NOTE: your gcc / g++ from Homebrew is probably in /usr/local/bin
 #export CXX=/usr/local/bin/g++-8 CC=/usr/local/bin/gcc-8
@@ -7,8 +7,8 @@
 
 # R returns FALSE (not a non-zero exit code) if a file copy operation
 # breaks. Let's fix that
-.handle_result <- function(res){
-    if (!res){
+.handle_result <- function(res) {
+  if (!res) {
     stop("Copying files failed!")
   }
 }
@@ -18,60 +18,47 @@ unlink(x = "lightgbm_r", recursive = TRUE)
 dir.create("lightgbm_r")
 
 # copy in the relevant files
-result <- file.copy(
-    from = "R-package/./"
-    , to = "lightgbm_r/"
-    , recursive = TRUE
-    , overwrite = TRUE
-)
+result <- file.copy(from = "R-package/./",
+                    to = "lightgbm_r/",
+                    recursive = TRUE,
+                    overwrite = TRUE)
 .handle_result(result)
 
-result <- file.copy(
-    from = "include/"
-    , to = file.path("lightgbm_r", "src/")
-    , recursive = TRUE
-    , overwrite = TRUE
-)
+result <- file.copy(from = "include/",
+                    to = file.path("lightgbm_r", "src/"),
+                    recursive = TRUE,
+                    overwrite = TRUE)
 .handle_result(result)
 
-result <- file.copy(
-    from = "src/"
-    , to = file.path("lightgbm_r", "src/")
-    , recursive = TRUE
-    , overwrite = TRUE
-)
+result <- file.copy(from = "src/",
+                    to = file.path("lightgbm_r", "src/"),
+                    recursive = TRUE,
+                    overwrite = TRUE)
 .handle_result(result)
 
-result <- file.copy(
-    from = "CMakeLists.txt"
-    , to = file.path("lightgbm_r", "inst", "bin/")
-    , recursive = TRUE
-    , overwrite = TRUE
-)
+result <- file.copy(from = "CMakeLists.txt",
+                    to = file.path("lightgbm_r", "inst", "bin/"),
+                    overwrite = TRUE)
 .handle_result(result)
 
 # rebuild documentation
-devtools::document(
-    pkg = "lightgbm_r/"
-)
+devtools::document(pkg = "lightgbm_r")
 
 # Build the package
 # NOTE: --keep-empty-dirs is necessary to keep the deep paths expected
 #       by CMake while also meeting the CRAN req to create object files
 #       on demand
-devtools::build(
-    pkg = "lightgbm_r"
-    , args = c("--keep-empty-dirs")
-)
+devtools::build(pkg = "lightgbm_r",
+                args = c("--keep-empty-dirs"))
 
 # Install the package
 version <- gsub(
-    "Version: "
-    , ""
-    , grep(
-        "Version: "
-        , readLines(con = file.path("lightgbm_r", "DESCRIPTION"))
-        , value = TRUE
+  "Version: ",
+  "",
+  grep(
+    "Version: ",
+    readLines(con = file.path("lightgbm_r", "DESCRIPTION")),
+    value = TRUE
   )
 )
 tarball <- file.path(getwd(), sprintf("lightgbm_%s.tar.gz", version))
@@ -79,4 +66,4 @@ tarball <- file.path(getwd(), sprintf("lightgbm_%s.tar.gz", version))
 system(sprintf("R CMD INSTALL %s --no-multi-arch", tarball))
 
 # Run R CMD CHECK
-#R CMD CHECK lightgbm_2.1.2.tar.gz --as-cran | tee check.log | cat
+# R CMD CHECK lightgbm_2.1.2.tar.gz --as-cran | tee check.log | cat