如何获取 Maven 项目版本到 bash 命令行 [英] How to get Maven project version to the bash command line

问题描述

之前我发布了一个关于如何从命令行更改Maven项目版本的问题 这让我想到了一个新问题.

Previous I issued a question on how to change Maven project vesion from command line which lead me to a new issue.

以前我能够获取版本号，因为版本存储为易于从命令行 (bash) 进行 grep 和解析的属性.现在 pom.xml <version> 元素用于此目的，它不再是唯一的，因为所有依赖项以及其他一些依赖项也使用它.我认为没有办法使用 bash 脚本获取当前版本号没有用于解析 XML 的外部工具或一些非常上下文感知的 sed 命令.

Previously I was able to get the version number since the version was stored as a property that was easy to grep and parse from the command line (bash). Now that the pom.xml <version> element is used for this, it no longer is unique since all the dependencies and maybe some others too use this. I think there is no way to get the current version number with a bash script without external tools for parsing XML or some very context-aware sed command.

我认为最干净的解决方案是让 Maven 分发此版本信息.我正在考虑编写一个自定义的 maven 插件来检索不同的属性，但我想我会先在这里问.

The most clean solution in my opinion would be for Maven to hand out this version information. I was thinking of writing a custom maven plugin for retrieving different properties but I thought I'd ask here first.

那么，有没有什么简单的方法可以将 ${project.version} 的值放到命令行中?

So, is there any easy way to get the value of ${project.version} to the command line?

我必须手动cd 到目录，但这可以轻松完成.在我的 bash 脚本中，我有:

I had to cd to the directory manually but that can be done easily. In my bash script I have:

version=`cd $project_loc && mvn org.apache.maven.plugins:maven-help-plugin:2.1.1:evaluate -Dexpression=project.version | sed -n -e '/^[.*]/ !{ /^[0-9]/ { p; q } }'`

这为我提供了可以推进的当前版本.Grepping 可能更简单，但我想我想要尽可能健壮，所以我对以数字开头的第一行感到满意，并尝试将其作为版本号处理.

Which gives me the current version that I can then advance. Grepping might be simpler but I thought I'd like as robust as possible, so I'm satisfied with the first line that starts with a number and try to handle this as a version number.

# Advances the last number of the given version string by one.
function advance_version () {
    local v=$1
    # Get the last number. First remove any suffixes (such as '-SNAPSHOT').
    local cleaned=`echo $v | sed -e 's/[^0-9][^0-9]*$//'`
    local last_num=`echo $cleaned | sed -e 's/[0-9]*.//g'`
    local next_num=$(($last_num+1))
    # Finally replace the last number in version string with the new one.
    echo $v | sed -e "s/[0-9][0-9]*([^0-9]*)$/$next_num/"
}

我通过简单地调用来使用它:

And I use this by simply calling:

new_version=$(advance_version $version)

推荐答案

Tom's solution with the ExecMaven 插件要好得多，但仍然比它需要的要复杂.对我来说很简单:

Tom's solution with the Exec Maven Plugin is much better, but still more complicated than it needs to be. For me it's as simple as:

MVN_VERSION=$(mvn -q 
    -Dexec.executable=echo 
    -Dexec.args='${project.version}' 
    --non-recursive 
    exec:exec)

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