git diff 左侧显示行号

https://blog.csdn.net/TAlice/article/details/117533318

#!/bin/bash
diff-lines() {
        local path=
        local pathOld=
        local line=
        while read; do
                esc=$'\033'
                if [[ $REPLY =~ ---\ (a/)?.* ]]; then
                        continue
                elif [[ $REPLY =~ \+\+\+\ (b/)?([^[:blank:]$esc]+).* ]]; then
                        path=${BASH_REMATCH[2]}     #获取文件路径
                elif [[ $REPLY =~ @@\ -[0-9]+(,[0-9]+)?\ \+([0-9]+)(,[0-9]+)?\ @@.* ]]; then
                        line=${BASH_REMATCH[2]}     #获取添加/删除/修改的行
                elif [[ $REPLY =~ ^($esc\[[0-9;]+m)*([\ +-]) ]]; then

                        if [ "$path" != "$pathOld" ]; then
                                echo -e "\n\n$path:$line:$REPLY"  #不同文件间的修改用换行隔开
                        else
                                echo "$path:$line:$REPLY"
                        fi

                        if [[ ${BASH_REMATCH[2]} != - ]]; then
                                ((line++))
                        fi
                        pathOld=$path
                fi
        done
}

if [ "$1" != "" ]; then     #可查看单个文件的差异（方法：git-diff-lines  xxx.c）
        git diff -U0 --color=always --  "$1" | diff-lines
else
        git diff -U0 --color=always | diff-lines
fi