r-lib · jimhester · Apr 18, 2017 · Apr 18, 2017 · Apr 18, 2017 · Apr 18, 2017
diff --git a/NAMESPACE b/NAMESPACE
@@ -3,6 +3,7 @@
 export(create_package)
 export(use_appveyor)
 export(use_build_ignore)
+export(use_clang_format)
 export(use_code_of_conduct)
 export(use_coverage)
 export(use_cran_badge)

diff --git a/R/clang-format.R b/R/clang-format.R
@@ -0,0 +1,42 @@
+#' Use clang-format
+#'
+#' Creates \code{src/.clang-format} and adds a before_install step to
+#' `.travis.yml` to check the format is followed.
+#'
+#' @inheritParams use_template
+#' @export
+use_clang_format <- function(base_path = ".") {
+  if (!uses_travis(base_path)) {
+    stop("You must use_travis() first", call. = FALSE)
+  }
+
+  use_directory(
+    "travis",
+    ignore = TRUE,
+    base_path = base_path)
+
+  use_template(
+    "check_format.sh",
+    file.path("travis", "check_format.sh"),
+    ignore = TRUE,
+    base_path = base_path)
+  Sys.chmod(file.path("travis", "check_format.sh"), "0744")
+
+  use_template(
+    "clang-format",
+    file.path("src", ".clang-format"),
+    ignore = TRUE,
+    base_path = base_path)
+
+  message("Next run: `travis/check_format.sh` and commit the result")
+  message("Then:")
+  message("* Add to `.travis.yml`:\n",
+    "addons:\n",
+    "  apt:\n",
+    "    sources:\n",
+    "    - ubuntu-toolchain-r-test\n",
+    "    - llvm-toolchain-precise-3.9\n",
+    "    packages:\n",
+    "    - clang-format-3.9\n",
+    "before_install: travis/check_format.sh\n")
+}
diff --git a/inst/templates/check_format.sh b/inst/templates/check_format.sh
@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+
+shopt -s extglob
+
+clang_format=$(command -v clang-format)
+if $clang_format --version | grep -q '3.4'; then
+  clang_format=$(command -v clang-format-3.9)
+fi
+if [ -z "$clang_format" ]; then
+  echo "Could not find recent version of clang-format"
+  exit 1
+fi
+"$clang_format" -i src/!(RcppExports).@(c|h|cpp) && git diff-files -U --exit-code
diff --git a/inst/templates/clang-format b/inst/templates/clang-format
@@ -0,0 +1,11 @@
+---
+Language:        Cpp
+BasedOnStyle:  LLVM
+Standard: Cpp03
+AlignAfterOpenBracket: AlwaysBreak
+AllowShortBlocksOnASingleLine: false
+BinPackArguments: false
+BinPackParameters: false
+ConstructorInitializerAllOnOneLineOrOnePerLine: true
+PointerAlignment: Left
+...
diff --git a/man/use_clang_format.Rd b/man/use_clang_format.Rd