Add ClangFormat rules

.clang-format

@@ -30,7 +30,7 @@ BraceWrapping:
   BeforeCatch:     false
   BeforeElse:      false
   IndentBraces:    false
-BreakBeforeBinaryOperators: None
+BreakBeforeBinaryOperators: NonAssignment
 BreakBeforeBraces: Custom
 BreakBeforeTernaryOperators: true
 BreakConstructorInitializersBeforeComma: true

.github/CONTRIBUTING.md

@@ -108,9 +108,12 @@ The Branch Strategy is based on [git-flow-lite](http://nvie.com/posts/a-successf
 
 ### Coding styleguide
 
-This project follows the [Qt Coding Style](https://wiki.qt.io/Qt_Coding_Style). All submissions are expected to follow this style.
+The coding style of the project is enforced using llvm's `clang-format` formatting tool. A thorough description
+of the coding style can be found in the `.clang-format` file, but the main conventions are presented here.
 
-In particular, code must stick to the following rules:
+Formatting can be performed automatically by calling `make format` from the `build/` directory.
+
+Note that [formatting can be disabled on a piece of code](https://clang.llvm.org/docs/ClangFormatStyleOptions.html#disabling-formatting-on-a-piece-of-code) if manual formatting is deemed more readable.
 
 #### Naming convention
 `lowerCamelCase`

CMakeLists.txt

@@ -279,6 +279,8 @@ if(WITH_TESTS)
   enable_testing()
 endif(WITH_TESTS)
 
+include(CLangFormat)
+
 if(UNIX AND NOT APPLE)
   find_package(Qt5 COMPONENTS Core Network Concurrent Widgets Test LinguistTools DBus REQUIRED)
 elseif(APPLE)

cmake/CLangFormat.cmake

@@ -0,0 +1,59 @@
+#  Copyright (C) 2017 KeePassXC Team <team@keepassxc.org>
+#
+#  This program is free software: you can redistribute it and/or modify
+#  it under the terms of the GNU General Public License as published by
+#  the Free Software Foundation, either version 2 or (at your option)
+#  version 3 of the License.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+#
+#  You should have received a copy of the GNU General Public License
+#  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+set(EXCLUDED_DIRS
+    # third-party directories
+    zxcvbn/
+    http/qhttp/
+    streams/QtIOCompressor
+    # objective-c directories
+    autotype/mac
+)
+
+set(EXCLUDED_FILES
+    # third-party files
+    streams/qtiocompressor.cpp
+    streams/qtiocompressor.h
+    gui/KMessageWidget.h
+    gui/KMessageWidget.cpp
+    tests/modeltest.cpp
+    tests/modeltest.h
+    # objective-c files
+    core/ScreenLockListenerMac.h
+    core/ScreenLockListenerMac.cpp
+)
+
+file(GLOB_RECURSE ALL_SOURCE_FILES *.cpp *.h)
+foreach (SOURCE_FILE ${ALL_SOURCE_FILES})
+    foreach (EXCLUDED_DIR ${EXCLUDED_DIRS})
+        string(FIND ${SOURCE_FILE} ${EXCLUDED_DIR} SOURCE_FILE_EXCLUDED)
+        if (NOT ${SOURCE_FILE_EXCLUDED} EQUAL -1)
+            list(REMOVE_ITEM ALL_SOURCE_FILES ${SOURCE_FILE})
+        endif ()
+    endforeach ()
+    foreach (EXCLUDED_FILE ${EXCLUDED_FILES})
+        if (${SOURCE_FILE} MATCHES ".*${EXCLUDED_FILE}$")
+            list(REMOVE_ITEM ALL_SOURCE_FILES ${SOURCE_FILE})
+        endif ()
+    endforeach ()
+endforeach ()
+
+add_custom_target(
+        format
+        COMMAND clang-format
+        -style=file
+        -i
+        ${ALL_SOURCE_FILES}
+)