Creating a C/C++ Code Formatting tool with help of Clang tools

16 Jul, 2020
Today we are going to discuss formatting files in the user’s workspace by their extension. For this we are going to make use of Clang’s format tools.
Prerequisites:
Linux Machine
Python
Clang Tool
Setup:
Install Python using the following command:sudo apt-get install python
sudo apt-get install python
Install Clang Format Toolssudo apt-get install clang-format-3.5
sudo apt-get install clang-format-3.5
Create a python file named format-code.py at any location where you have read and write permissions. In this example we are going to create it in /home/user/. It shall contain the following code:# Python program to format C/C++ files using clang-formatimport os  # File Extension filter. You can add new extensioncpp_extensions = (".cxx",".cpp",".c", ".hxx", ".hh", ".cc", ".hpp")  # Set the current working directory for scanning c/c++ sources (including# header files) and apply the clang formatting# Please note "-style" is for standard style options# and "-i" is in-place editingfor root, dirs, files in os.walk(os.getcwd()):    for file in files:        if file.endswith(cpp_extensions):            os.system("clang-format-3.5 -i -style=file " + root + "/" + file)
# Python program to format C/C++ files using clang-formatimport os  # File Extension filter. You can add new extensioncpp_extensions = (".cxx",".cpp",".c", ".hxx", ".hh", ".cc", ".hpp")  # Set the current working directory for scanning c/c++ sources (including# header files) and apply the clang formatting# Please note "-style" is for standard style options# and "-i" is in-place editingfor root, dirs, files in os.walk(os.getcwd()):    for file in files:        if file.endswith(cpp_extensions):            os.system("clang-format-3.5 -i -style=file " + root + "/" + file)
Create format specification file and copy it to project’s top level directory , e.g., /home/user/myproject/Create formatting file (in example, we are creating google coding style tool)clang-format-3.5 -style=google -dump-config > .clang-format Copy it to project’s directory i.e., it’s location becomes: /home/user/myproject/.clang-format
Create formatting file (in example, we are creating google coding style tool)clang-format-3.5 -style=google -dump-config > .clang-format Copy it to project’s directory i.e., it’s location becomes: /home/user/myproject/.clang-format
Create formatting file (in example, we are creating google coding style tool)clang-format-3.5 -style=google -dump-config > .clang-format 
clang-format-3.5 -style=google -dump-config > .clang-format 
Copy it to project’s directory i.e., it’s location becomes: /home/user/myproject/.clang-format
How to use it?
Navigate to the directory whose files you want to format, e.g.,cd  /home/user/myproject/c-source/
cd  /home/user/myproject/c-source/
Run the format-code file that you created earlierpython /home/user/format-code.py
python /home/user/format-code.py
This shall format all the files in our source directory with the extension same as that mentioned in the code.
This article is contributed by Nitin Deokate .If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.
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