如何使用 ocamlfind 或 opam 获取已安装的 package 的版本？
[英]How to get the version of a installed package using ocamlfind or opam?
问题描述
In my configure script, I need to check the installed version of a package <package> using ocamlfind or opam .
在我的配置脚本中，我需要使用ocamlfind或opam检查 package <package>的安装版本。 How do I get this information?我如何获得这些信息？
1 个解决方案
解决方案1
0 2020-05-13 16:51:35
Using ocamlfind: ocamlfind query -format %v <package>使用 ocamlfind： ocamlfind query -format %v <package>
This information is not directly available when running ocamlfind query --help , but it is available with ocamlfind query -help-format , which displays it among the other format options:此信息在运行ocamlfind query --help时不直接可用，但可通过ocamlfind query -help-format获得，它会在其他格式选项中显示它：
Formats for -format strings: ... %v version...
Using opam: opam info -f installed-version <package>使用 opam： opam info -f installed-version <package>
It returns -- when the package is not installed.它返回--当 package 未安装时。
This comes from opam info --help :这来自opam info --help ：
-f FIELDS, --field=FIELDS Only display the values of these fields. Fields can be selected among name, version, package, synopsis, synopsis-or-target, description, <field>:, installed-version, pin, source-hash, opam-file, all-installed-versions, available-versions, all-versions, repository, installed-files, vc-ref, depexts. Multiple fields can be separated with commas, in which case field titles will be printed; the raw value of any opam-file field can be queried by suffixing a colon character (:), eg --field=depopts:.
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