如何检查是否安装了Perl模块? [英] How do I check whether a Perl module is installed?

问题描述

我正在编写一个小的Perl脚本，该脚本取决于可能可用的某些模块，因此在安装过程中，我将必须检查其中是否包含所有内容.我可以只写use some::module并查看是否出现错误，但是诸如您需要安装some :: module"之类的简短消息对最终用户会更有用.

I'm writing a small Perl script that depends on some modules that might be available, so during the installation I would have to check if everythings there. I could just write use some::module and see if an error comes up, but a short message like "You need to install some::module" would be more helpful for endusers.

我也可以只搜索@INC中的每个目录，但是因为它是Perl，所以必须有一种更简单的方法.

I also could just search every directory in @INC, but as it's Perl, there has to be an easier way.

推荐答案

perl -MSome::Module -e ';'

哎呀，看错了问题.我以为您想一次性了解，而不是以可恢复的方式发现它.我总是这样:

Whoops, misread the question. I thought you wanted to know in a one-off instance, not discovering it in a recoverable manner. I always use something like this:

sub try_load {
  my $mod = shift;

  eval("use $mod");

  if ($@) {
    #print "\$@ = $@\n";
    return(0);
  } else {
    return(1);
  }
}

您这样使用:

$module = 'Some::Module';
if (try_load($module)) {
  print "loaded\n";
} else {
  print "not loaded\n";
}

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