Nxstyle checkpatch support (#47)

* tools/nxstyle.c: Donot check unknown file extension files

nxstyle only support c soure file and header file check, donot check
other unknown file extension files.

* tools/checkpatch.sh: Add checkpatch.sh script based on nxstyle tool

Usage:
checkpatch.sh patch-list // default as patch list
checkpatch.sh -p patch-list
checkpatch.sh -c commit-list
checkpatch.sh -f file-list
checkpatch.sh - // read from stdin, which used by git pre-commit hook

And git pre-commit hook could use checkpatch.sh as below:
git diff --cached | ./tools/checkpatch.sh -

tools/checkpatch.sh

@@ -0,0 +1,127 @@
+#!/usr/bin/env bash
+#
+# Copyright (C) 2019 Xiaomi
+#
+# 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.
+#
+
+TOOLDIR=$(dirname $0)
+
+usage() {
+  echo "USAGE: ${0} [options] [list|-]"
+  echo ""
+  echo "Options:"
+  echo "-h"
+  echo "-p <patch list> (default)"
+  echo "-c <commit list>"
+  echo "-f <file list>"
+  echo "-  read standard input mainly used by git pre-commit hook as below:"
+  echo "   git diff --cached | ./tools/checkpatch.sh -"
+}
+
+check_file() {
+  $TOOLDIR/nxstyle -m 86 $@ 2>&1
+}
+
+check_ranges() {
+  local fail=0
+
+  while read; do
+    if [[ $REPLY =~ \+\+\+\ (b/)?([^[:blank:]]+).* ]]; then
+      if [ "$ranges" != "" ]; then
+        check_file $ranges $path 2>&1
+        if [ $? != 0 ]; then
+          fail=1
+        fi
+      fi
+      path=${BASH_REMATCH[2]}
+      ranges=""
+    elif [[ $REPLY =~ @@\ -[0-9]+(,[0-9]+)?\ \+([0-9]+,[0-9]+)?\ @@.* ]]; then
+      ranges+="-r ${BASH_REMATCH[2]} "
+    fi
+  done
+  if [ "$ranges" != "" ]; then
+    check_file $ranges $path 2>&1
+    if [ $? != 0 ]; then
+      fail=1
+    fi
+  fi
+  if [ $fail = 1 ]; then
+    exit 1
+  fi
+}
+
+check_patch() {
+  git apply --check $1
+  if [ $? != 0 ]; then
+    exit 1
+  fi
+  git apply $1
+  cat $1 | check_ranges
+  git apply -R $1
+}
+
+check_commit() {
+  git show $1 | check_ranges
+}
+
+make -C $TOOLDIR -f Makefile.host nxstyle 1>/dev/null
+
+if [ -z "$1" ]; then
+  usage
+  exit 0
+fi
+
+while [ ! -z "$1" ]; do
+  case "$1" in
+  -h )
+    usage
+    exit 0
+    ;;
+  -p )
+    shift
+    patches=$@
+    break
+    ;;
+  -c )
+    shift
+    commits=$@
+    break
+    ;;
+  -f )
+    shift
+    files=$@
+    break
+    ;;
+  - )
+    check_ranges
+    exit 0
+    ;;
+  * )
+    patches=$@
+    break
+    ;;
+  esac
+done
+
+for patch in $patches; do
+  check_patch $patch
+done
+
+for commit in $commits; do
+  check_commit $commit
+done
+
+for file in $files; do
+  check_file $file
+done

tools/nxstyle.c

@@ -60,6 +60,7 @@
 #define WARN(m, l, o)  message(WARN, (m), (l), (o))
 #define ERROR(m, l, o) message(ERROR, (m), (l), (o))
 #define INFO(m, l, o)  message(INFO, (m), (l), (o))
+#define INFOFL(m,s)    message(INFO, (m), -1, -1)
 
 /****************************************************************************
  * Private types
@@ -157,7 +158,7 @@ static int message(enum class_e class, const char *text, int lineno, int ndx)
     {
       if (lineno == -1 && ndx == -1)
         {
-          fprintf(out, "%s:%s: %s\n", class_text[class], text,  g_file_name);
+          fprintf(out, "%s: %s: %s\n", g_file_name, class_text[class], text);
         }
       else
         {
@@ -301,11 +302,11 @@ int main(int argc, char **argv, char **envp)
 
   /* Are we parsing a header file? */
 
-  ext         = strrchr(g_file_name, '.');
+  ext = strrchr(g_file_name, '.');
 
   if (ext == 0)
     {
-      WARN("No file extension", 0 , 0);
+      INFOFL("No file extension", g_file_name);
     }
   else if (strcmp(ext, ".h") == 0)
     {
@@ -316,6 +317,12 @@ int main(int argc, char **argv, char **envp)
       g_file_type = C_SOURCE;
     }
 
+  if (g_file_type == UNKNOWN)
+    {
+      INFOFL("Unknown file extension", g_file_name);
+      return 0;
+    }
+
   btabs          = false; /* True: TAB characters found on the line */
   bcrs           = false; /* True: Carriable return found on the line */
   bfunctions     = false; /* True: In private or public functions */