clang-format: rename to clang-format-3.8

Formatting depends on the version of the tool used, so define
the formatter based on that version.

src/c/CMakeLists.txt

-add_formatter(clang-format reformat clang-format)
-add_formatter(clang-format-kwsys reformat clang-format)
+foreach(v
+    3.8
+    )
+  set(ver ${v})
+  configure_file(format.clang-format.in format.clang-format-${v} @ONLY)
+  configure_file(clang-format.yaml.in clang-format-${v}.yaml.in COPYONLY)
+  add_formatter(clang-format-${v} reformat clang-format-${v})
+endforeach()
+add_formatter(clang-format-kwsys reformat clang-format-3.8)

src/c/clang-format.yaml.in

 formatter_clang-format:
     kind: "clang-format"
-    script: "@CMAKE_INSTALL_PREFIX@/bin/format.clang-format"
+    script: "@script@"
     config_files:
         - ".clang-format"

src/c/format.clang-format-kwsys

 #!/bin/sh
 # This formatter is meant specifically for the KWSys project.
 # It performs special filtering before and after running
-# `clang-format` in order to protect `@KWSYS_NAMESPACE@`
+# `clang-format-3.8` in order to protect `@KWSYS_NAMESPACE@`
 # and other placholders using `@`.
 #
-# This formatter uses the `clang-format` tool to perform
+# This formatter uses the `clang-format-3.8` tool to perform
 # formatting of files written in C, C++, and other C-like
 # languages (CUDA, GLSL, etc.).
 #
-# It uses the `clang-format` executable in `$PATH` and checks for
+# It uses the `clang-format-3.8` executable in `$PATH` and checks for
 # the existence of the `.clang-format` file as its configuration.
 
 set -e
@@ -21,8 +21,8 @@ if ! [ -f "$path" ]; then
     exit 4
 fi
 
-if ! which "clang-format" > /dev/null; then
-    echo >&2 'error: could not find the `clang-format` binary'
+if ! which "clang-format-3.8" > /dev/null; then
+    echo >&2 'error: could not find the `clang-format-3.8` binary'
     exit 3
 fi
 
@@ -35,7 +35,7 @@ fi
 # clang-format can understand the symbols and preserve lengths.
 sed -i 's/@\(KWSYS_[A-Z0-9_]\+\)@/x\1x/g' "$path"
 
-clang-format -i "$path"
+clang-format-3.8 -i "$path"
 
 # Restore the original `@KWSYS_...@` placeholders.
 sed -i 's/x\(KWSYS_[A-Z0-9_]\+\)x/@\1@/g' "$path"

src/c/format.clang-format → src/c/format.clang-format.in

 #!/bin/sh
-# This formatter uses the `clang-format` tool to perform
+# This formatter uses the `clang-format-@ver@` tool to perform
 # formatting of files written in C, C++, and other C-like
 # languages (CUDA, GLSL, etc.).
 #
-# It uses the `clang-format` executable in `$PATH` and checks for
+# It uses the `clang-format-@ver@` executable in `$PATH` and checks for
 # the existence of the `.clang-format` file as its configuration.
 
 set -e
@@ -16,8 +16,8 @@ if ! [ -f "$path" ]; then
     exit 4
 fi
 
-if ! which "clang-format" > /dev/null; then
-    echo >&2 'error: could not find the `clang-format` binary'
+if ! which "clang-format-@ver@" > /dev/null; then
+    echo >&2 'error: could not find the `clang-format-@ver@` binary'
     exit 3
 fi
 
@@ -26,4 +26,4 @@ if ! [ -f ".clang-format" ]; then
     exit 2
 fi
 
-exec clang-format -i "$path"
+exec clang-format-@ver@ -i "$path"

test/clang-format-3.8/CMakeLists.txt

+add_formatter_test(clang-format-3.8 pass format.c pass)
+add_formatter_test(clang-format-3.8 format format.c format)
+add_formatter_test(clang-format-3.8 no-config-file format.c fail)

test/clang-format/CMakeLists.txt

-add_formatter_test(clang-format pass format.c pass)
-add_formatter_test(clang-format format format.c format)
-add_formatter_test(clang-format no-config-file format.c fail)