Coding style defined more precisely. Issue CANopenNode#117.

Author: CANopenNode

Diff for: .clang-format

@@ -0,0 +1,15 @@
+# https://clang.llvm.org/docs/ClangFormatStyleOptions.html
+BasedOnStyle: LLVM
+
+# indent 4 spaces
+IndentWidth: 4
+
+# break before function
+BreakBeforeBraces: Linux
+
+# arguments and parameters in same line or one line for each
+BinPackArguments: false
+BinPackParameters: false
+
+# keep up to two empty lines
+MaxEmptyLinesToKeep: 2

Diff for: README.md

@@ -48,24 +48,26 @@ in a project with specific hardware and specific application.
 
 
 Documentation, support and contributions
--------------------------
-Code is documented in header files. Running
-[doxygen](http://www.stack.nl/~dimitri/doxygen/index.html) in project
-base folder will produce complete html documentation. Just open
-CANopenNode/doc/html/index.html in browser.
+----------------------------------------
+Code is documented in header files. Running [doxygen](http://www.doxygen.nl/)
+or `make doc` in project base folder will produce complete html documentation.
+Just open CANopenNode/doc/html/index.html in browser.
 
 Report issues on https://github.com/CANopenNode/CANopenNode/issues
 
 Older and still active discussion group is on Sourceforge
 http://sourceforge.net/p/canopennode/discussion/387151/
 
-For some implementations of CANopenNode on real hardware see table below.
+For some implementations of CANopenNode on real hardware see
+[Device support](#device-support) section.
 [CANopenSocket](https://github.com/CANopenNode/CANopenSocket) is nice
 implementation for Linux devices. It includes command line interface for
 master access of the CANopen network. There is also some Getting started.
 
 Contributions are welcome. Best way to contribute your code is to fork
-a project, modify it and then send a pull request.
+a project, modify it and then send a pull request. Some basic formatting
+rules should be followed: Linux style with indentation of 4 spaces. There
+is also a configuration file for `clang-format` tool.
 
 
 Flowchart of a typical CANopenNode implementation

Diff for: codingStyle

@@ -3,16 +3,28 @@
  *
  * @file        codingStyle
  * @ingroup     codingStyle
- * @author      Janez Paternoster
- * @copyright   2015 Janez Paternoster
- * 
- * License.
+ * @author      name
+ * @copyright   2020 name
+ *
+ * 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.
  */
 
-
 #ifndef XYZ_H
 #define XYZ_H
 
+#ifdef __cplusplus
+extern "C" {
+#endif
 
 /**
  * @defgroup codingStyle Description of coding style
@@ -22,20 +34,23 @@
  * Contents of this file should be the base for .h source file, except function
  * body at the end.
  *
- * ###Indentation
- * Indent size is 4.
- * Spaces are used, not tabs.
+ * ###Style
+ *  - Style is based on Linux style
+ *  - Indent size is 4.
+ *  - Spaces are used, not tabs.
+ *  - More datails are defined in .clang-format file
+ *  - Some (old) code is still not corectly formatted. (To not break git history.)
  *
  * ###Doxygen
- * Documentation is generated by <http://doxygen.org>.
+ * Documentation is generated by doxygen.
  * Doxygen comment starts with /**. /**< is used after member.
  * Documentation is usually in header.
  * Doxygen settings:
  *  - JAVADOC_AUTOBRIEF = YES.
  *  - See doxyfile for other settings.
  *
- * Doxygen specifics: If description of the structure member is one sentence only,
- * don't use period after the sentence.
+ * Doxygen specifics: If description of the structure member is one sentence
+ * only, don't use period after the sentence.
  *
  * ###Misra C
  * Code shall follow MISRA-C:2012 standard.
@@ -47,10 +62,10 @@
  * here.
  */
 typedef struct {
-    int8_t              member1;        /**< Short description of the member 1 */
-    uint16_t            member2;        /**< Note the '/**<' sequence after the member 2 */
+    int8_t member1;   /**< Short description of the member 1 */
+    uint16_t member2; /**< Note the '/**<' sequence after the member 2 */
     /** Long description of the variable stringMember. More description. */
-    char_t              stringMember[5];
+    char_t stringMember[5];
 } object1_t;
 
 
@@ -62,37 +77,40 @@ typedef struct {
  *
  * @param obj Pointer to object. Function operates on this object (not on global
  * variables).
- * @param arg2 Description of the argument.
- * @param arg3 Description of the argument.
- * @param arg4 Description of the argument.
+ * @param argument_2 Description of the argument.
+ * @param argument_2 Description of the argument.
+ * @param argument_4 Description of the argument.
  *
  * @return Some value.
  */
-int32_t foo1(
-        object1_t              *obj,
-        int32_t                 arg2,
-        uint16_t                arg3,
-        float32_t               arg4)
+int32_t foo1(object1_t *obj,
+             int32_t argument_2,
+             uint16_t argument_3,
+             float32_t argument_4)
 {
     /* Comment */
 
     /* Multiline
      * comment.
      */
 
-    if(xy == yz) {   /* Comment. '//' comments are not allowed */
-        ...
-    }
-    else {
-        ...
+    if (xy == yz) { /* Comment. '//' comments are not allowed */
+        a = b;
+    } else {
+        a = c;
     }
 
-    switch(zx) {
-        case 1: {
-            ...
-        }
+    switch (zx) {
+    case 1:
+        a = b;
+        break;
     }
 }
 
 /** @} */
-#endif
+
+#ifdef __cplusplus
+}
+#endif /*__cplusplus */
+
+#endif /* XYZ_H */