feat(lastmod): use git commit to generate lastmod info (#124)

exampleSite/config.toml

@@ -6,6 +6,7 @@ preserveTaxonomyNames = true
 enableRobotsTXT = true
 enableEmoji = true
 theme = "even"
+enableGitInfo = false # use git commit log to generate lastmod record # 可根据 Git 中的提交生成最近更新记录。
 
 # Syntax highlighting by Chroma. NOTE: Don't enable `highlightInClient` and `chroma` at the same time!
 pygmentsOptions = "linenos=table"
@@ -53,6 +54,9 @@ copyright = ""            # default: author.name ↓        # 默认为下面配
   debug = false             # If true, load `eruda.min.js`. See https://github.com/liriliri/eruda
 
   since = "2017"            # Site creation time          # 站点建立时间
+  # use public git repo url to link lastmod git commit, enableGitInfo should be true.
+  # 指定 git 仓库地址，可以生成指向最近更新的 git commit 的链接，需要将 enableGitInfo 设置成 true.
+  gitRepo = ""
 
   # site info (optional)                                  # 站点信息（可选，不需要的可以直接注释掉）
   logoTitle = "Even"        # default: the title value    # 默认值: 上面设置的title值

layouts/partials/post/copyright.html

@@ -6,7 +6,10 @@
   </p>
   <p class="copyright-item">
     <span class="item-title">{{ T "lastMod" }}</span>
-    <span class="item-content">{{ .Lastmod.Format (.Site.Params.dateFormatToUse | default "2006-01-02") }}</span>
+    <span class="item-content">
+        {{ .Lastmod.Format (.Site.Params.dateFormatToUse | default "2006-01-02") }}
+        {{ with .GitInfo }}<a href="{{ $.Site.Params.gitRepo }}/commit/{{ .Hash }}" title="{{ .Subject }}">({{ .AbbreviatedHash }})</a>{{ end }}
+    </span>
   </p>
   {{ if $.Site.Params.linkToMarkDown -}}
     {{ with $.OutputFormats.Get "markdown" -}}