尝试把clang-tidy集成到AWTK项目

前言

项目经过一段时间的耕耘终于进入了团队开发阶段，期间出现了很多问题，其中一个就是开会讨论团队的代码风格规范，目前项目代码风格比较混乱，有的模块是驼峰，有的模块是匈牙利，后面经过讨论，决定采用匈牙利，和awtk库的api风格一致。

讨论完之后就是改代码了，有十几个模块几百个函数要改，一个个人工去改显然费时费力，改的时候就在想这种东西有没有自动化的做法了?

于是下班开始探索一番，首先是尝试用AI写一个批量扫描文件，用正则匹配不符合规则的python脚本，结果费时费力，效果明显不好。

不对，c/c++发展了十几年，这类问题难道没有现成的方案？

后面搜了点原理，正则的思路对于这类问题显然不对，没法识别函数和变量，那只能用抽象语法树了。对象是c/c++，应该是一个类似c/c++编译器的静态分析工具。

最后找到了clang-tidy。

尝试集成1.0

首先下载clang-tidy:

pip install clang-tidy

假设示例项目src结构如下：

src
├── application.c
├── common
│   ├── navigator.c
│   ├── navigator.h
│   └── temperature.h
├── main.c
├── modules
│   ├── libframebuffer.c
│   └── libframebuffer.h
├── pages
│   └── home_page.c
└── SConscript

要修改的文件例：libframebuffer，里面api是驼峰格式，需要自动改成匈牙利格式，home_page有引用。

libframebuffer.h

#ifndef LIBFRAMEBUFFER_H
#define LIBFRAMEBUFFER_H
typedef struct {int width;int height;int bpp;void* buffer;
} LibFrameBuffer;LibFrameBuffer* LibFrameBufferInit();void LibFrameBufferFree(LibFrameBuffer* fb);#endif 	

libframebuffer.c

#include "libframebuffer.h"
#include <stdlib.h>LibFrameBuffer* LibFrameBufferInit()
{return (LibFrameBuffer*)malloc(sizeof(LibFrameBuffer));
}void LibFrameBufferFree(LibFrameBuffer* fb)
{free(fb);
}

home_page.c

#include "awtk.h"
#include "libframebuffer.h"/*** 初始化窗口的子控件*/
static ret_t visit_init_child(void* ctx, const void* iter) {widget_t* win = WIDGET(ctx);widget_t* widget = WIDGET(iter);const char* name = widget->name;// 初始化指定名称的控件（设置属性或注册事件），请保证控件名称在窗口上唯一if (name != NULL && *name != '\0') {}return RET_OK;
}/*** 初始化窗口*/
ret_t home_page_init(widget_t* win, void* ctx) {(void)ctx;return_value_if_fail(win != NULL, RET_BAD_PARAMS);widget_foreach(win, visit_init_child, win);LibFrameBufferInit();return RET_OK;
}

在项目根目录下设置好.clang-tidy，这个是clang-tidy的配置文件, clang-tidy有很多的check项，和代码命名风格相关的是readability-identifier-naming，这个checker下面有非常多类型的拼写设置，我这里设置了类, 变量，函数，宏四个类型的拼写项，其中前三个的lower_case对应的就是匈牙利小写写法，最后一个UPPER_CASE是全大写写法。

readability-identifier-naming的具体设置可见：https://clang.llvm.org/extra/clang-tidy/checks/readability/identifier-naming.html

Checks: >readability-identifier-naming
CheckOptions:- key:             readability-identifier-naming.ClassCasevalue:           lower_case- key:             readability-identifier-naming.VariableCasevalue:           lower_case- key:             readability-identifier-naming.FunctionCasevalue:           lower_case- key:             readability-identifier-naming.MacroDefinitionCasevalue:           UPPER_CASE

clang-tidy本身相当于半个编译器，会对翻译单元的头文件进行处理，而不是像脚本那样单纯进行文本解析，所以在给clang-tidy一个找不到头文件的源文件时会导致报错：

zhangdalin@huwyi-ubuntu:~/AWStudioProjects/awtk_clang_tidy_test$ clang-tidy src/pages/home_page.
Error while trying to load a compilation database:
Could not auto-detect compilation database for file "src/pages/home_page."
No compilation database found in /home/zhangdalin/AWStudioProjects/awtk_clang_tidy_test/src/pages or any parent directory
fixed-compilation-database: Error while opening fixed database: No such file or directory
json-compilation-database: Error while opening JSON database: No such file or directory
Running without flags.
Error while processing /home/zhangdalin/AWStudioProjects/awtk_clang_tidy_test/src/pages/home_page..
error: no input files [clang-diagnostic-error]
error: no such file or directory: '/home/zhangdalin/AWStudioProjects/awtk_clang_tidy_test/src/pages/home_page.' [clang-diagnostic-error]
error: unable to handle compilation, expected exactly one compiler job in '' [clang-diagnostic-error]
Found compiler error(s).

因此必须找到一个方法让clang-tidy能够读取到项目所有的源文件和头文件。

使用compiler_command.json

compiler_command.json上面记录了项目每个编译的编译命令，输入源文件和输出obj，类似于给工具一个符号表，clang-tidy通过这张符号表进行解析。

在CMake可以设置set(CMAKE_EXPORT_COMPILE_COMMANDS ON)生成compiler_command.json给clang-tidy，我于是去看scons有没有对应设置，还好有，见：https://scons.org/doc/latest/HTML/scons-user/ch27.html

在SConstruct和SConscript分别添加env.Tool('compilation_db')和env.CompilationDatabase()[0], scons就能在BIN_DIR得到compiler_command.json，我试过在SConscript把两个指令一起加进去，不知道为什么在windows会报找不到AttributeError: 'SConsEnvironment' object has no attribute '__COMPILATIONDB_Entry':的错误，Linux上就正常。我这里的情形是跨平台，windows和linux都需要考虑使用。

SConstruct

+env = helper.call(DefaultEnvironment)
+env.Tool('compilation_db')

SConscript

sources = Glob('**/*.c') + Glob('*.c')
+compile_database = env.CompilationDatabase()[0]

scons编译，在BIN_DIR得到compiler_command.json，验证通过。

接下来写clang-tidy调用逻辑，scons本身是python脚本，直接封装成函数就好了，难点在于如何让scons执行时，如果需要将封装函数也一并调用，对此，scons提供了Options选项, 可以自定义选项来控制调用逻辑，见：https://scons.org/doc/latest/HTML/scons-user/ch10.html

这里就提供一个--clang-tidy选项给scons，修改后的SConscript:

import os
import subprocess
from SCons.Script import *env = DefaultEnvironment().Clone()
BIN_DIR = os.environ['BIN_DIR']
LIB_DIR = os.environ['LIB_DIR']sources = Glob('**/*.c') + Glob('*.c')AddOption('--clang-tidy',dest='clang_tidy',metavar='BOOL',action='store_true',default=False,help="Don't run clang-tidy static code analysis automatically")
compile_database = env.CompilationDatabase()[0]
program = env.Program(os.path.join(BIN_DIR, 'demo'), sources, LIBS = env['LIBS'])def run_clang_tidy(target, source, env):source_file = str(source[0])compilation_db = str(source[1])cmd = f"clang-tidy -p {compilation_db} -header-filter=.* {source_file}"print(f"Running: {cmd}")subprocess.run(cmd, shell=True)return 0print(f"clang_tidy option = {GetOption('clang_tidy')}")if GetOption('clang_tidy') == True:for source in sources:run_clang_tidy('',[source, compile_database], env)

执行，会看到clang-tidy把三方库的头文件也加进了检测，原因是设置用了-header-filter=.*来将项目头文件加入检测，不加这个选项是只能检测c文件的，而且函数只能检测到没有加入头文件声明的函数。

/home/zhangdalin/AWStudioProjects/awtk/3rd/SDL/include/SDL_stdinc.h:569:9: warning: invalid case style for macro definition 'SDL_malloc' [readability-identifier-naming]
#define SDL_malloc malloc^~~~~~~~~~SDL_MALLOC
/home/zhangdalin/AWStudioProjects/awtk/3rd/SDL/include/SDL_stdinc.h:570:9: warning: invalid case style for macro definition 'SDL_calloc' [readability-identifier-naming]
#define SDL_calloc calloc^~~~~~~~~~SDL_CALLOC
/home/zhangdalin/AWStudioProjects/awtk/3rd/SDL/include/SDL_stdinc.h:571:9: warning: invalid case style for macro definition 'SDL_realloc' [readability-identifier-naming]
#define SDL_realloc realloc^~~~~~~~~~~SDL_REALLOC

解决方法是在.clang-tidy下设置HeaderFilterRegex, 原理是clang-tidy搜索的文件是绝对路径的列表，设置HeaderFilterRegex将只检测和设置的正则匹配的文件路径。

注意原来脚本的-header-filter=.*要去掉，否则会覆盖.clang-tidy上的设置，那就失效了。

.clang-tidy

HeaderFilterRegex: 'awtk_clang_tidy_test\\src\\.*|awtk_clang_tidy_test/src/.*' #左边匹配windows下项目路径，右边匹配linux下项目路径

SConscript

def run_clang_tidy(target, source, env):source_file = str(source[0])compilation_db = str(source[1])cmd = f"clang-tidy -p {compilation_db} {source_file}"print(f"Running: {cmd}")subprocess.run(cmd, shell=True)return 0

自此一个基础的集成就完成了。

Running: clang-tidy -p compile_commands.json common/navigator.c
2024 warnings generated.
Suppressed 2024 warnings (2024 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
Running: clang-tidy -p compile_commands.json modules/libframebuffer.c
679 warnings generated.
/home/zhangdalin/AWStudioProjects/awtk_clang_tidy_test/src/modules/libframebuffer.c:4:17: warning: invalid case style for function 'LibFrameBufferInit' [readability-identifier-naming]
LibFrameBuffer* LibFrameBufferInit()^~~~~~~~~~~~~~~~~~lib_frame_buffer_init
/home/zhangdalin/AWStudioProjects/awtk_clang_tidy_test/src/modules/libframebuffer.c:9:6: warning: invalid case style for function 'LibFrameBufferFree' [readability-identifier-naming]
void LibFrameBufferFree(LibFrameBuffer* fb)^~~~~~~~~~~~~~~~~~lib_frame_buffer_free

尝试集成2.0

看似简单，实际引用到项目还是有问题，scons不像CMake, 编译compiler_command.json的过程和编译项目的过程是绑死的，一定要编译完项目才会生成compiler_command.json，我曾经试过把env.Program只生成json，发现json能够出来，但是里面不带任何项目相关的文件编译命令，只有编译整个项目才能更新compiler_command.json。

这就是scons的不便之处了，项目是没法先静态检测再编译的，只能放到编译后再检测了。如果是CMake，大可以通过cmake -S. -B build和cmake --build build把构建compiler_command.json和编译项目的过程按先后分开。

怎么让scons在env.Program后执行自定义命令？可以用env.Command, scons编译先后顺序涉及到builder的概念，这里就不深入了，参考：

https://stackoverflow.com/questions/36273482/scons-strange-execution-order

https://scons.org/doc/1.3.0/HTML/scons-user/c3721.html

修改后的SConscript如下：

import os
import subprocess
from SCons.Script import *env = DefaultEnvironment().Clone()
BIN_DIR = os.environ['BIN_DIR']
LIB_DIR = os.environ['LIB_DIR']sources = Glob('**/*.c') + Glob('*.c')AddOption('--clang-tidy',dest='clang_tidy',metavar='BOOL',action='store_true',default=False,help="Don't run clang-tidy static code analysis automatically")
compile_database = env.CompilationDatabase()[0]
program = env.Program(os.path.join(BIN_DIR, 'demo'), sources, LIBS = env['LIBS'])def run_clang_tidy(target, source, env):source_file = str(source[0])compilation_db = str(source[1])cmd = f"clang-tidy -p {compilation_db}  {source_file}"print(f"Running: {cmd}")subprocess.run(cmd, shell=True)return 0print(f"clang_tidy option = {GetOption('clang_tidy')}")if GetOption('clang_tidy') == True:for source in sources:# 会在env.Program之后执行env.Command(target=f"{os.path.basename(str(source))}.clang-tidy.log",source=[source, compile_database],action=Action(run_clang_tidy, cmdstr="Running clang-tidy on ${SOURCE}"))

把编译出的compile_commands.json删了，然后scons --clang-tidy测试，正常运行:

zhangdalin@huwyi-ubuntu:~/AWStudioProjects/awtk_clang_tidy_test$ scons --clang-tidy
scons: Reading SConscript files ...
APP_SCRIPTS_ROOT:/home/zhangdalin/AWStudioProjects/awtk_clang_tidy_test/scripts
AWTK_ROOT: /home/zhangdalin/AWStudioProjects/awtk
AWTK_SCRIPTS_ROOT: /home/zhangdalin/AWStudioProjects/awtk/scripts
...
/home/zhangdalin/AWStudioProjects/awtk_clang_tidy_test/bin exist.
/home/zhangdalin/AWStudioProjects/awtk_clang_tidy_test/lib exist.
False
AWTK_ROOT: /home/zhangdalin/AWStudioProjects/awtk
TKC_ONLY: False
{}
/home/zhangdalin/AWStudioProjects/awtk/bin/libawtk.so==>/home/zhangdalin/AWStudioProjects/awtk_clang_tidy_test/bin
clang_tidy option = True
scons: done reading SConscript files.
scons: Building targets ...
Building compilation database src/compile_commands.json
Running clang-tidy on src/application.c
Running: clang-tidy -p src/compile_commands.json  src/application.c
2024 warnings generated.
Suppressed 2024 warnings (2024 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
Running clang-tidy on src/pages/home_page.c
Running: clang-tidy -p src/compile_commands.json  src/pages/home_page.c
2027 warnings generated.
src/pages/home_page.c:8:13: warning: unused variable 'win' [clang-diagnostic-unused-variable]widget_t* win = WIDGET(ctx);^
Suppressed 2026 warnings (2026 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
Running clang-tidy on src/modules/libframebuffer.c
Running: clang-tidy -p src/compile_commands.json  src/modules/libframebuffer.c
679 warnings generated.
/home/zhangdalin/AWStudioProjects/awtk_clang_tidy_test/src/modules/libframebuffer.c:4:17: warning: invalid case style for function 'LibFrameBufferInit' [readability-identifier-naming]
LibFrameBuffer* LibFrameBufferInit()^~~~~~~~~~~~~~~~~~lib_frame_buffer_init
/home/zhangdalin/AWStudioProjects/awtk_clang_tidy_test/src/modules/libframebuffer.c:9:6: warning: invalid case style for function 'LibFrameBufferFree' [readability-identifier-naming]
void LibFrameBufferFree(LibFrameBuffer* fb)^~~~~~~~~~~~~~~~~~lib_frame_buffer_free
Suppressed 677 warnings (677 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
Running clang-tidy on src/main.c
Running: clang-tidy -p src/compile_commands.json  src/main.c
2028 warnings generated.
Suppressed 2028 warnings (2028 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
Running clang-tidy on src/common/navigator.c
Running: clang-tidy -p src/compile_commands.json  src/common/navigator.c
2024 warnings generated.
Suppressed 2024 warnings (2024 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
scons: done building targets.

能正常运行了，这时候就可以加--fix选项去自动改naming错误了，我具体测试了下，还是没法全部一次性修改的，有些引用函数的文件就没有改到，在这个例子是只改了libframebuffer.c，libframebuffer.h没有修改。好在数量少，自动化工具能解决大部分。

然而还是有问题，这个方案只能在linux下使用，在windows上会报unable to handle compilation错误：

Running clang-tidy on src\modules\libframebuffer.c
Running: clang-tidy --fix -p src\compile_commands.json  src\modules\libframebuffer.c
Error while processing D:\AWStudioProjects\awtk_clang_tidy_test\src\modules\libframebuffer.c.
error: unable to handle compilation, expected exactly one compiler job in '' [clang-diagnostic-error]
warning: @C:\Users\z5843\AppData\Local\Temp\tmp_8x5etvp.lnk: 'linker' input unused [clang-diagnostic-unused-command-line-argument]
Found compiler errors, but -fix-errors was not specified.
Fixes have NOT been applied.

原因是我awtk在windows上设置的用msvc编译，scons对于msvc生成的compiler_command.json里面调用指令实际上要通过一层快捷方式文件去中转，称之为响应文件（response files）, 因为windows的命令行有长度限制，没法一次调用太长的命令。

[{"command": "cl @C:\\Users\\z5843\\AppData\\Local\\Temp\\tmpwbrtpkke.lnk","directory": "D:\\AWStudioProjects\\awtk_clang_tidy_test","file": "src\\common\\navigator.c","output": "src\\common\\navigator.obj"},{"command": "cl @C:\\Users\\z5843\\AppData\\Local\\Temp\\tmpmf4y8gp4.lnk","directory": "D:\\AWStudioProjects\\awtk_clang_tidy_test","file": "src\\modules\\libframebuffer.c","output": "src\\modules\\libframebuffer.obj"},{"command": "cl @C:\\Users\\z5843\\AppData\\Local\\Temp\\tmpjye3ldpl.lnk","directory": "D:\\AWStudioProjects\\awtk_clang_tidy_test","file": "src\\pages\\home_page.c","output": "src\\pages\\home_page.obj"},{"command": "cl @C:\\Users\\z5843\\AppData\\Local\\Temp\\tmpjtyr5i36.lnk","directory": "D:\\AWStudioProjects\\awtk_clang_tidy_test","file": "src\\application.c","output": "src\\application.obj"},{"command": "cl @C:\\Users\\z5843\\AppData\\Local\\Temp\\tmpn639b_bf.lnk","directory": "D:\\AWStudioProjects\\awtk_clang_tidy_test","file": "src\\main.c","output": "src\\main.obj"},{"command": "cl @C:\\Users\\z5843\\AppData\\Local\\Temp\\tmpghyoi9f_.lnk","directory": "D:\\AWStudioProjects\\awtk_clang_tidy_test","file": "D:\\AWStudioProjects\\awtk\\3rd\\gtest\\googletest\\src\\gtest-all.cc","output": "D:\\AWStudioProjects\\awtk\\3rd\\gtest\\googletest\\src\\gtest-all.obj"},{"command": "cl @C:\\Users\\z5843\\AppData\\Local\\Temp\\tmpubp7ar8o.lnk","directory": "D:\\AWStudioProjects\\awtk_clang_tidy_test","file": "tests\\main.cc","output": "tests\\main.obj"}
]

这些快捷方式第一次编译才会创建，在第二次编译时就能复用，而且如果修改了源文件（比如修改代码或者开关宏），这些快捷方式就失效了，这就是为什么我改源文件或者删除compiler_command.json都会导致报unable to handle compilation错误。我在网上找了一圈都不知道怎么关掉这个响应文件。

其实也可以设置awtk编译方式为MINGW, 这样就没有问题了，可惜我实际项目一些三方库是msvc编译的，和mingw不兼容，这个选择就废了。

没法泛化到windows，方案还要继续改进。

BTW： CMake+MSVC在windows上是不会生成compiler_command.json的，不知道scons怎么做到的生成。

尝试集成3.0

其实不使用compiler_command.json, 也可以通过给clang-tidy直接指明源文件和头文件路径的方式来绕过，这样检测就不依赖于编译了。

可以通过直接用scons的配置文件，比较方便，也可以独立脚本，不过路径需要脚本去暴力匹配，如果项目庞大，写起匹配逻辑会比较麻烦，这里选用前者。

之前的脚本其实还有个问题，run_clang_tidy执行一次只检测一个文件，一个文件就执行一次clang-tidy命令，这样使用是低效的，实际上clang-tidy可以批量集成多个文件一起去分析。

run_clang_tidy修改，拆除来放到clang_tidy_helper.py，置于scripts文件夹：

import subprocessdef run_clang_tidy(flags, source_file_str, cxxflags, include_file_str):cmd = f"clang-tidy {flags} {source_file_str} -- {cxxflags} {include_file_str}"print(f"Running: {cmd}")subprocess.run(cmd, shell=True)return 0

修改后的SConscript如下：

import os
import subprocess
from scripts.clang_tidy_helper import run_clang_tidy
from SCons.Script import *env = DefaultEnvironment().Clone()
BIN_DIR = os.environ['BIN_DIR']
LIB_DIR = os.environ['LIB_DIR']sources = Glob('**/*.c') + Glob('*.c')AddOption('--clang-tidy',dest='clang_tidy',metavar='BOOL',action='store_true',default=False,help="Don't run clang-tidy static code analysis automatically")program = env.Program(os.path.join(BIN_DIR, 'demo'), sources, LIBS = env['LIBS'])if GetOption('clang_tidy') == True:sources_file_str = ' '.join(os.path.normpath(str(s)) for s in sources)    flags = env['CCFLAGS'] include_file_str = ' '.join([f'-I{os.path.normpath(str(i))}' for i in env['CPPPATH']])run_clang_tidy('', sources_file_str, flags, include_file_str)

运行，可以看到输出不一样了，会统计文件数，累计warning和error数，能检测出libframebuffer的naming错误，不过这次头文件和源文件的error都可以显示了，加入–fix选项运行，发现头文件，源文件，引用的文件都被修正了。

/home/zhangdalin/AWStudioProjects/awtk_clang_tidy_test/src/modules/libframebuffer.c:4:17: warning: invalid case style for function 'LibFrameBufferInit' [readability-identifier-naming]
LibFrameBuffer* LibFrameBufferInit()^~~~~~~~~~~~~~~~~~lib_frame_buffer_init
/home/zhangdalin/AWStudioProjects/awtk_clang_tidy_test/src/modules/libframebuffer.c:4:17: note: FIX-IT applied suggested code changes
/home/zhangdalin/AWStudioProjects/awtk_clang_tidy_test/src/modules/libframebuffer.c:9:6: warning: invalid case style for function 'LibFrameBufferFree' [readability-identifier-naming]
void LibFrameBufferFree(LibFrameBuffer* fb)^~~~~~~~~~~~~~~~~~lib_frame_buffer_free
/home/zhangdalin/AWStudioProjects/awtk_clang_tidy_test/src/modules/libframebuffer.c:9:6: note: FIX-IT applied suggested code changes
/home/zhangdalin/AWStudioProjects/awtk_clang_tidy_test/src/modules/libframebuffer.h:10:17: warning: invalid case style for function 'LibFrameBufferInit' [readability-identifier-naming]
LibFrameBuffer* LibFrameBufferInit();^~~~~~~~~~~~~~~~~~lib_frame_buffer_init
/home/zhangdalin/AWStudioProjects/awtk_clang_tidy_test/src/modules/libframebuffer.h:10:17: note: FIX-IT applied suggested code changes
/home/zhangdalin/AWStudioProjects/awtk_clang_tidy_test/src/modules/libframebuffer.h:12:6: warning: invalid case style for function 'LibFrameBufferFree' [readability-identifier-naming]
void LibFrameBufferFree(LibFrameBuffer* fb);^~~~~~~~~~~~~~~~~~lib_frame_buffer_free
/home/zhangdalin/AWStudioProjects/awtk_clang_tidy_test/src/modules/libframebuffer.h:12:6: note: FIX-IT applied suggested code changes
/home/zhangdalin/AWStudioProjects/awtk_clang_tidy_test/src/pages/../modules/libframebuffer.h:10:17: warning: invalid case style for function 'LibFrameBufferInit' [readability-identifier-naming]
LibFrameBuffer* LibFrameBufferInit();^~~~~~~~~~~~~~~~~~lib_frame_buffer_init
/home/zhangdalin/AWStudioProjects/awtk_clang_tidy_test/src/pages/../modules/libframebuffer.h:10:17: note: FIX-IT applied suggested code changes
/home/zhangdalin/AWStudioProjects/awtk_clang_tidy_test/src/pages/home_page.c:28:3: note: FIX-IT applied suggested code changesLibFrameBufferInit();^
/home/zhangdalin/AWStudioProjects/awtk_clang_tidy_test/src/pages/../modules/libframebuffer.h:12:6: warning: invalid case style for function 'LibFrameBufferFree' [readability-identifier-naming]
void LibFrameBufferFree(LibFrameBuffer* fb);^~~~~~~~~~~~~~~~~~lib_frame_buffer_free
/home/zhangdalin/AWStudioProjects/awtk_clang_tidy_test/src/pages/../modules/libframebuffer.h:12:6: note: FIX-IT applied suggested code changes
/home/zhangdalin/AWStudioProjects/awtk_clang_tidy_test/src/pages/home_page.c:8:13: warning: unused variable 'win' [clang-diagnostic-unused-variable]widget_t* win = WIDGET(ctx);^
clang-tidy applied 7 of 7 suggested fixes.
Suppressed 8802 warnings (8802 in non-user code).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
scons: done reading SConscript files.
scons: Building targets ...
scons: `.' is up to date.
scons: done building targets.

如果不想编译项目，单独做静态检测，也比较简单：

AddOption('--no-compile',dest='no_compile',metavar='BOOL',action='store_true',default=False,help="Don't compile the code")if GetOption('no_compile') == False:program = env.Program(os.path.join(BIN_DIR, 'demo'), sources, LIBS = env['LIBS'])

从这边开始，总算就没有什么比较难受的使用问题了，而且可以集成检测工具一起编译，也可以单独检测。

还有很多细节，比如改用run-clang-tidy.py脚本提速，ci/cd集成，时间原因先写到这里，后面有时间看看如何实现。

最终的脚本：

SConscript

import os
import subprocess
from scripts.clang_tidy_helper import run_clang_tidy
from SCons.Script import *env = DefaultEnvironment().Clone()
BIN_DIR = os.environ['BIN_DIR']
LIB_DIR = os.environ['LIB_DIR']sources = Glob('**/*.c') + Glob('*.c')AddOption('--clang-tidy',dest='clang_tidy',metavar='BOOL',action='store_true',default=False,help="Don't run clang-tidy static code analysis automatically")AddOption('--no-compile',dest='no_compile',metavar='BOOL',action='store_true',default=False,help="Don't compile the code")if GetOption('no_compile') == False:program = env.Program(os.path.join(BIN_DIR, 'demo'), sources, LIBS = env['LIBS'])if GetOption('clang_tidy') == True:sources_file_str = ' '.join(os.path.normpath(str(s.get_abspath())) for s in sources)    flags = env['CCFLAGS'] include_file_str = ' '.join([f'-I{os.path.normpath(str(i))}' for i in env['CPPPATH']])run_clang_tidy('--fix ', sources_file_str, flags, include_file_str)

SConstruct

import os
import scripts.app_helper as app
import clang_tidy as tidyCUSTOM_WIDGET_LIBS = [{"root" : '3rd/awtk-widget-label-rotate','shared_libs': ['label_rotate'],'static_libs': []
}]DEPENDS_LIBS = CUSTOM_WIDGET_LIBS + []helper = app.Helper(ARGUMENTS)
helper.set_deps(DEPENDS_LIBS)# app.prepare_depends_libs(ARGUMENTS, helper, DEPENDS_LIBS)
env = helper.call(DefaultEnvironment)SConscriptFiles = ['src/SConscript', 'tests/SConscript']
helper.SConscript(SConscriptFiles)

scripts/clang_tidy_helper.py

import os
import sys
import platform
import re
import subprocessdef run_clang_tidy(flags, source_file_str, cxxflags, include_file_str):cmd = f"clang-tidy {flags} {source_file_str} -- {cxxflags} {include_file_str}"print(f"Running: {cmd}")subprocess.run(cmd, shell=True)return 0

补充

clang-tidy不一定能一次解决所有的代码规范问题，比如私有函数习惯写__前缀，即使是用匈牙利写法也会被误报：

D:\AWStudioProjects\awtk_clang_tidy_test\src\modules\lib_framebuffer.c:11:6: warning: invalid case style for function '__lib_framebuffer_load_format' [readability-identifier-naming]      11 | void __lib_framebuffer_load_format(lib_framebuffer *fb){|      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~|      lib_framebuffer_load_format
D:\AWStudioProjects\awtk_clang_tidy_test\src\modules\lib_framebuffer.c:31:6: warning: invalid case style for function '__lib_framebuffer_init' [readability-identifier-naming]31 | void __lib_framebuffer_init(lib_framebuffer *fb, const char *path) {|      ^~~~~~~~~~~~~~~~~~~~~~|      lib_framebuffer_init
D:\AWStudioProjects\awtk_clang_tidy_test\src\modules\lib_framebuffer.c:73:6: warning: invalid case style for function '__lib_framebuffer_destroy' [readability-identifier-naming]73 | void __lib_framebuffer_destroy(lib_framebuffer *fb) {|      ^~~~~~~~~~~~~~~~~~~~~~~~~|      lib_framebuffer_destroy

clang-tidy做了一个workaround, 允许用正则的方式去忽略匹配的命名样式。

注意必须是全字匹配，部分匹配是不起效的。

Checks: >readability-identifier-naming
CheckOptions:- key:             readability-identifier-naming.ClassCasevalue:           lower_case- key:             readability-identifier-naming.VariableCasevalue:           lower_case- key:             readability-identifier-naming.FunctionIgnoredRegexpvalue:           '__.*'- key:             readability-identifier-naming.ConstexprVariableCasevalue:           UPPER_CASE

参考

https://github.com/SCons/scons/issues/4637

https://scons.org/doc/latest/HTML/scons-user/ch27.html

https://lrita.github.io/2023/03/21/auto-clang-tidy-cpp-code/