我们每次修改代码大多数都是增量的，而通过lcov生成的代码覆盖率报告都是全量的，不方便查看，所以写了一个脚本，增量了增量部分的数据。脚本如下：

#!/usr/bin/python2
######################################################################
# Purpose:  根据git提交记录，修改代码覆盖率的html，增加增量的数据
# Author:   rodinluo
######################################################################
__doc__ = '''
USAGE:
python ./incre_lconv.py <since>..<until> <check_dir> <lcov_html_dir><project_name> 
example:
python incre_lcov.py 8b2628dfe839b6086e74721c93469b0cf18720e7..HEAD '["test1dir","test2dir"]'  /data/ projectname
since:git 开始的版本
util:git 结束的版本
check_dir:关注的代码目录
lcov_html_dir:已经通过lcov生成的html根目录
project_name:项目名
本脚本应该在project_name目录执行,project_name目录包含test1dir\test2dir,/data下面是project_name/*
'''
import sys, os, re
import json
import subprocess as commands
from pprint import *
from bs4 import *

DEBUG = 0

class UTCover(object) :
    def __init__(self, since_until, check_dirs, lcov_dir, root_dir) :
        self.since, self.until = since_until.split('..')
        self.check_dirs = json.loads(check_dirs)
        self.lcov_dir = lcov_dir
        self.root_dir = root_dir

    def get_src(self):
        satus, output = commands.getstatusoutput("git diff --name-only %s %s" %(self.since, self.until))
        if DEBUG: print(output)
        src_files = [f for f in output.split('\n')
                        for m in self.check_dirs if m in f
                        if os.path.splitext(f)[1][1:] in ['c', 'cpp']]
        if DEBUG: pprint(src_files)
        return src_files

    def get_change(self, src_files):
        changes = {}
        for f in src_files:
            satus, output = commands.getstatusoutput("git log --oneline %s..%s %s | awk '{print $1}'" %(self.since, self.until, f))
            commits = output.split('\n')
            cmd = "git blame %s | grep -E '(%s)' | awk  -F' *|)' '{print $6}'" %(f, '|'.join(commits))
            satus, lines = commands.getstatusoutput(cmd)
            changes[f] = [ int(i) for i in lines.split('\n') if i.isdigit() ]

        if DEBUG: pprint(changes)
        return changes

    def update_html(self, f, lines):
        hf = os.path.join(self.lcov_dir, self.root_dir, f + '.gcov.html')
        print(hf)
        if not os.path.exists(hf):
            return None

        try:
            html = open(hf, "r", encoding="utf-8")
            handle = html.read()
        except UnicodeDecodeError:
            print("decode error:" + hf)
            return None
        soup = BeautifulSoup(handle,'lxml')
        a = soup.findAll("a", {"name":True})
        lineNoCov = 0
        lineCov = 0
        for i in range(len(a)):
            if int(a[i]["name"]) in lines:
                a[i].span["class"][0] = ("updateLineNum")
                span = a[i].span.findNextSibling()
                if span:
                    if span["class"][0] == "lineNoCov":
                        lineNoCov = lineNoCov + 1
                    else:
                        if span["class"][0] == "lineCov":
                            lineCov = lineCov + 1

        headerCovTableEntry = soup.findAll("td", { "class" : "headerCovTableEntry"}, limit = 2)
        if not headerCovTableEntry:
            print("css.class headerCovTableEntry not found")
            return None
        contents0 = str(lineCov) + "  -  " + headerCovTableEntry[0].contents[0]
        headerCovTableEntry[0].contents[0].replaceWith(contents0)

        contents1 = str(lineNoCov + lineCov) + "  -  " + headerCovTableEntry[1].contents[0]
        headerCovTableEntry[1].contents[0].replaceWith(contents1)

        headerCovTableEntryX = soup.findAll("td", { "class" : ["headerCovTableEntryLo", "headerCovTableEntryMed", "headerCovTableEntryHi"]}, limit = 1)
        if not headerCovTableEntryX :
            print("css.class headerCovTableEntry* not found")
            return None
        
        totalLine = lineNoCov + lineCov
        if totalLine == 0:
            totalLine = 1
        contents2 = str(round(lineCov / totalLine, 3)  * 100) + "%  -  " + headerCovTableEntryX[0].contents[0]
        headerCovTableEntryX[0].contents[0].replaceWith(contents2)

        with open(hf, 'w',encoding="utf-8") as fp:
            fp.write(soup.prettify())

    def check(self):
        with open(self.lcov_dir + "/gcov.css", 'a+') as f:
            f.write('''
/* Source code view: line update number format */
span.updateLineNum    
{    
    background-color: #33CC00;    
}
                    ''')
        src_files = self.get_src()
        changes = self.get_change(src_files)
        for f, lines in changes.items():
            self.update_html(f, lines)

if len(sys.argv) == 1:
    print (__doc__)
    sys.exit(0)

ret = UTCover(*sys.argv[1:]).check()
sys.exit(ret)

效果如下，其中最左边的行号绿底部分表示的是本次修改的代码行，最上面的Lines中，Hit的左边是本次修改代码的覆盖行数，右边是总的覆盖行数，Total的左边是本次修改代码的行数，右边是总的行数，Coverge的左边是本次修改代码的覆盖率，右边是总的覆盖率:

screenshot-20220401-100604.png