misc: migrate from GNU indent to clang-format

Type: make
Change-Id: I085dcd6fe826da14d456f84a23355310bdc5d1e9
Signed-off-by: Damjan Marion <damarion@cisco.com>

4 files changed, 119 insertions, 196 deletions

diff --git a/.clang-format b/.clang-format
index 977ed2dbf00..8b5c955cede 100644
--- a/.clang-format
+++ b/.clang-format
@@ -1,38 +1,21 @@
----
-AlignEscapedNewlinesLeft: true
-AlignTrailingComments: true
-AllowAllParametersOfDeclarationOnNextLine: true
-AllowShortIfStatementsOnASingleLine: false
-AllowShortLoopsOnASingleLine: false
-AllowShortFunctionsOnASingleLine: false
-AlwaysBreakBeforeMultilineStrings: false
-BreakBeforeBinaryOperators: false
-BreakBeforeTernaryOperators: true
-BinPackParameters: true
-BreakBeforeBraces: GNU
-ColumnLimit:     79
-IndentCaseLabels: false
-MaxEmptyLinesToKeep: 1
-PenaltyBreakBeforeFirstCallParameter: 19
-PenaltyBreakComment: 60
-PenaltyBreakString: 1000
-PenaltyBreakFirstLessLess: 120
-PenaltyExcessCharacter: 1000000
-PenaltyReturnTypeOnItsOwnLine: 60
-PointerBindsToType: false
-SpaceBeforeAssignmentOperators: true
-SpaceBeforeParens: Always
-SpacesBeforeTrailingComments: 1
-SpacesInParentheses: false
-SpaceInEmptyParentheses: false
-SpacesInCStyleCastParentheses: false
-SpaceAfterControlStatementKeyword: true
-Cpp11BracedListStyle: true
-Standard:        Cpp11
+# Minimal clang-format version is 8
+
+BasedOnStyle: GNU
+UseTab: Always
+SpaceAfterCStyleCast: true
 SortIncludes: false
-IndentWidth:     2
-TabWidth:        4
-UseTab:          Never
-IndentFunctionDeclarationAfterType: false
-ContinuationIndentWidth: 4
-...
+AlignConsecutiveMacros: true
+BreakBeforeTernaryOperators: false
+BreakBeforeBinaryOperators: None
+ContinuationIndentWidth: 2
+
+ForEachMacros:
+  - 'clib_bitmap_foreach'
+  - 'pool_foreach'
+  - 'pool_foreach_index'
+  - 'vec_foreach'
+  - 'vec_foreach_backwards'
+  - 'vec_foreach_index'
+  - 'vec_foreach_index_backwards'
+  - 'vlib_foreach_rx_tx'
+
diff --git a/Makefile b/Makefile
index 0bf1a835a27..1f37a7c77b3 100644
--- a/Makefile
+++ b/Makefile
@@ -14,6 +14,7 @@
 export WS_ROOT=$(CURDIR)
 export BR=$(WS_ROOT)/build-root
 CCACHE_DIR?=$(BR)/.ccache
+SHELL:=/bin/bash
 GDB?=gdb
 PLATFORM?=vpp
 SAMPLE_PLUGIN?=no
@@ -64,7 +65,7 @@ endif
 DEB_DEPENDS  = curl build-essential autoconf automake ccache
 DEB_DEPENDS += debhelper dkms git libtool libapr1-dev dh-systemd dh-python
 DEB_DEPENDS += libconfuse-dev git-review exuberant-ctags cscope pkg-config
-DEB_DEPENDS += lcov chrpath autoconf indent clang-format libnuma-dev
+DEB_DEPENDS += lcov chrpath autoconf libnuma-dev
 DEB_DEPENDS += python3-all python3-setuptools check
 DEB_DEPENDS += libboost-all-dev libffi-dev python3-ply libmbedtls-dev
 DEB_DEPENDS += cmake ninja-build uuid-dev python3-jsonschema python3-yaml
@@ -77,11 +78,12 @@ LIBFFI=libffi6 # works on all but 20.04 and debian-testing
 ifeq ($(OS_VERSION_ID),18.04)
 	DEB_DEPENDS += python-dev python-all python-pip python-virtualenv
 	DEB_DEPENDS += libssl-dev
-	DEB_DEPENDS += clang-9
+	DEB_DEPENDS += clang-9 clang-format-10
 else ifeq ($(OS_VERSION_ID),20.04)
 	DEB_DEPENDS += python3-virtualenv
 	DEB_DEPENDS += libssl-dev
 	DEB_DEPENDS += libelf-dev # for libbpf (af_xdp)
+	DEB_DEPENDS += clang-format-10
 	LIBFFI=libffi7
 else ifeq ($(OS_ID)-$(OS_VERSION_ID),debian-9)
 	DEB_DEPENDS += libssl1.0-dev
@@ -613,7 +615,10 @@ compdb:
 
 .PHONY: checkstyle
 checkstyle: checkfeaturelist
-	@build-root/scripts/checkstyle.sh
+ifeq ($(shell which clang-format-10),)
+	@sudo apt-get install -y clang-format-10
+endif
+	@extras/scripts/checkstyle.sh
 
 .PHONY: checkstyle-commit
 checkstyle-commit:
@@ -627,7 +632,7 @@ checkstyle-all: checkstyle-commit checkstyle checkstyle-test
 
 .PHONY: fixstyle
 fixstyle:
-	@build-root/scripts/checkstyle.sh --fix
+	@extras/scripts/checkstyle.sh --fix
 
 .PHONY: checkstyle-api
 checkstyle-api:
diff --git a/build-root/scripts/checkstyle.sh b/build-root/scripts/checkstyle.sh
deleted file mode 100755
index 58f67154114..00000000000
--- a/build-root/scripts/checkstyle.sh
+++ /dev/null
@@ -1,155 +0,0 @@
-#!/bin/bash
-
-# Copyright (c) 2015 Cisco and/or its affiliates.
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at:
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-VPP_DIR=`dirname $0`/../../
-EXIT_CODE=0
-FIX="0"
-FULL="0"
-CHECKSTYLED_FILES=""
-UNCHECKSTYLED_FILES=""
-
-# If the user provides --fix, then actually fix things
-# Note: this is meant for use outside of the CI Jobs, by users cleaning things up
-
-while true; do
-	case ${1} in
-		--fix)
-			FIX="1"
-			;;
-		--full)
-			FULL="1"
-			;;
-	esac
-	shift || break
-done
-
-if [ "${FULL}" == "1" ]; then
-	FILELIST=$(git ls-tree -r HEAD --name-only)
-else
-	FILELIST=$((git diff HEAD~1.. --name-only; git ls-files -m ) | sort -u)
-fi
-
-# Check to make sure we have indent.  Exit if we don't with an error message, but
-# don't *fail*.
-command -v indent > /dev/null
-if [ $? != 0 ]; then
-    echo "Cound not find required command \"indent\".  Checkstyle aborted"
-    exit ${EXIT_CODE}
-fi
-indent --version
-
-# Check to make sure we have clang-format.  Exit if we don't with an error message, but
-# don't *fail*.
-HAVE_CLANG_FORMAT=0
-command -v clang-format > /dev/null
-if [ $? != 0 ]; then
-    echo "Could not find command \"clang-format\". Checking C++ files will cause abort"
-else
-    clang-format --version
-    x=$(echo "" | clang-format 2>&1)
-    if [[ "$x" == "" ]]; then
-        HAVE_CLANG_FORMAT=1
-    else
-	echo "Output produced while formatting empty file (expected empty string):"
-	echo "$x"
-        echo "Could not find working \"clang-format\". Checking C++ files will cause abort"
-    fi
-fi
-
-cd ${VPP_DIR}
-git status
-for i in ${FILELIST}; do
-    if [ -f ${i} ] && [ ${i} != "build-root/scripts/checkstyle.sh" ] && [ ${i} != "extras/emacs/fix-coding-style.el" ]; then
-        grep -q '>>>>>>>' ${i}
-        if [ $? == 0 ]; then
-            echo "Unresolved merge conflict detected in" ${i} "... Abort."
-            exit 1
-        fi
-        grep -q "fd.io coding-style-patch-verification: ON" ${i}
-        if [ $? == 0 ]; then
-            EXTENSION=`basename ${i} | sed 's/^\w\+.//'`
-            case ${EXTENSION} in
-                hpp|cpp|cc|hh)
-                    CMD="clang-format"
-                    if [ ${HAVE_CLANG_FORMAT} == 0 ]; then
-                            echo "C++ file detected. Abort. (missing clang-format)"
-                            exit ${EXIT_CODE}
-                    fi
-                    ;;
-                *)
-                    CMD="indent"
-                    ;;
-            esac
-            CHECKSTYLED_FILES="${CHECKSTYLED_FILES} ${i}"
-            if [ ${FIX} == 0 ]; then
-                if [ "${CMD}" == "clang-format" ]
-                then
-                    clang-format ${i} > ${i}.out2
-                else
-                    indent ${i} -o ${i}.out1 > /dev/null 2>&1
-                    indent ${i}.out1 -o ${i}.out2 > /dev/null 2>&1
-                fi
-                # Remove trailing whitespace
-                sed -i -e 's/[[:space:]]*$//' ${i}.out2
-                diff -q ${i} ${i}.out2
-            else
-                if [ "${CMD}" == "clang-format" ]; then
-                    clang-format -i ${i} > /dev/null 2>&1
-                else
-                    indent ${i}
-                    indent ${i}
-                fi
-                # Remove trailing whitespace
-                sed -i -e 's/[[:space:]]*$//' ${i}
-            fi
-            if [ $? != 0 ]; then
-                EXIT_CODE=1
-                echo
-                echo "Checkstyle failed for ${i}."
-                if [ "${CMD}" == "clang-format" ]; then
-                    echo "Run clang-format as shown to fix the problem:"
-                    echo "clang-format -i ${VPP_DIR}${i}"
-                else
-                    echo "Run indent (twice!) as shown to fix the problem:"
-                    echo "indent ${VPP_DIR}${i}"
-                    echo "indent ${VPP_DIR}${i}"
-                fi
-            fi
-            if [ -f ${i}.out1 ]; then
-                rm ${i}.out1
-            fi
-            if [ -f ${i}.out2 ]; then
-                rm ${i}.out2
-            fi
-        else
-            UNCHECKSTYLED_FILES="${UNCHECKSTYLED_FILES} ${i}"
-        fi
-    else
-        UNCHECKSTYLED_FILES="${UNCHECKSTYLED_FILES} ${i}"
-    fi
-done
-
-if [ ${EXIT_CODE} == 0 ]; then
-    echo "*******************************************************************"
-    echo "* VPP CHECKSTYLE SUCCESSFULLY COMPLETED"
-    echo "*******************************************************************"
-else
-    echo "*******************************************************************"
-    echo "* VPP CHECKSTYLE FAILED"
-    echo "* CONSULT FAILURE LOG ABOVE"
-    echo "* NOTE: Running 'build-root/scripts/checkstyle.sh --fix' *MAY* fix the issue"
-    echo "*******************************************************************"
-fi
-exit ${EXIT_CODE}
diff --git a/extras/scripts/checkstyle.sh b/extras/scripts/checkstyle.sh
new file mode 100755
index 00000000000..b40f43fa1e6
--- /dev/null
+++ b/extras/scripts/checkstyle.sh
@@ -0,0 +1,90 @@
+#!/bin/bash
+
+# Copyright (c) 2020 Cisco and/or its affiliates.
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at:
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+set -eEo pipefail
+
+CLANG_FORMAT_VER=10
+GIT_DIFF_ARGS="-U0 --no-color --relative HEAD~1"
+CLANG_FORMAT_DIFF_ARGS="-style file -p1"
+SUFFIX="-${CLANG_FORMAT_VER}"
+
+clang-format${SUFFIX} --version
+
+in=$(mktemp)
+git diff ${GIT_DIFF_ARGS} > ${in}
+
+line_count=$(sed -n '/^+.*\*INDENT-O[NF][F]\{0,1\}\*/p' ${in} | wc -l)
+if [ ${line_count} -gt 0 ] ; then
+    echo
+    sed -n '/^+++ /{h}; /^+.*\*INDENT-O[NF][F]\{0,1\}\*/{x;p;x;p;}' ${in}
+    echo
+    echo "*******************************************************************"
+    echo "* CHECKSTYLE FAILED"
+    echo "* Please remove INDENT-ON and INDENT-OFF from modified lines."
+    echo "*******************************************************************"
+    rm ${in}
+    exit 1
+fi
+
+if [ "${1}" == "--fix" ]; then
+  cat ${in} | clang-format-diff${SUFFIX} ${CLANG_FORMAT_DIFF_ARGS} -i
+  filelist=$(sed -n 's/^+++ b\/\(.*\.[ch]\)/\1/p' ${in})
+  git status ${filelist}
+  rm ${in}
+  exit 0
+fi
+
+line_count=$(sed -n '/^+.*\s\+$/p' ${in} | wc -l)
+if [ ${line_count} -gt 0 ] ; then
+    echo
+    sed -n '/^+++/h; /^+.*\s\+$/{x;p;x;p;}' ${in}
+    echo
+    echo "*******************************************************************"
+    echo "* CHECKSTYLE FAILED"
+    echo "* Trailing whitespace detected"
+    echo "*******************************************************************"
+    rm ${in}
+    exit 1
+fi
+
+out=$(mktemp)
+
+cat ${in} | clang-format-diff${SUFFIX} ${CLANG_FORMAT_DIFF_ARGS} > ${out}
+rm ${in}
+
+line_count=$(cat ${out} | wc -l)
+
+if [ -t 1 ] && [ -n $(tput colors) ] && [ $(tput colors) -ge 1 ] && \
+   command -v highlight &> /dev/null ; then
+  highlight --syntax diff -O ansi ${out}
+else
+  cat ${out}
+fi
+
+rm ${out}
+
+if [ ${line_count} -gt 0 ] ; then
+    echo "*******************************************************************"
+    echo "* CHECKSTYLE FAILED"
+    echo "* CONSULT DIFF ABOVE"
+    echo "* NOTE: Running 'extras/scripts/checkstyle.sh --fix' *MAY* fix the issue"
+    echo "*******************************************************************"
+    exit 1
+else
+    echo "*******************************************************************"
+    echo "* CHECKSTYLE SUCCESSFULLY COMPLETED"
+    echo "*******************************************************************"
+    exit 0
+fi