css: Truncate long descriptions

In the index, if the descriptions are too long, it can make the table
quite awkward to read.

This patch makes them truncate automatically.

git.py

@@ -223,6 +223,17 @@ class Repo:
         refs = self._for_each_ref(pattern="refs/heads/", sort="-authordate")
         return [ref[len("refs/heads/") :] for _, _, ref in refs]
 
+    @functools.cache
+    def main_branch(self):
+        """Get the name of the main branch."""
+        bs = self.branch_names()
+        for branch in ["master", "main"]:
+            if branch in bs:
+                return branch
+        if bs:
+            return bs[0]
+        return None
+
     @functools.cache
     def tags(self, sort="-taggerdate"):
         """Get the (name, obj_id) of the tags."""

static/git-arr.css

@@ -159,6 +159,15 @@ table.projects td.name a {
 }
 
 
+/* Truncate long descriptions based on the viewport width. */
+table.projects td.desc {
+    max-width: 50vw;
+    text-overflow: ellipsis;
+    overflow: hidden;
+    white-space: nowrap;
+}
+
+
 /* Age of an object.
  * Note this is hidden by default as we rely on javascript to show it. */
 span.age {

views/index.html

@@ -20,7 +20,8 @@
     % for repo in sorted(repos.values(), key = lambda r: r.name):
     <tr>
         <td class="name"><a href="r/{{repo.name}}/">{{repo.name}}</a></td>
-        <td class="desc"><a href="r/{{repo.name}}/">{{repo.info.desc}}</a></td>
+        <td class="desc"><a href="r/{{repo.name}}/" title="{{repo.info.desc}}">
+            {{repo.info.desc}}</a></td>
         <td><span class="age">{{repo.last_commit_timestamp()}}</span></td>
     </tr>
     %end

views/summary.html

@@ -35,20 +35,22 @@
 <hr/>
 % end
 
-% if "master" in repo.branch_names():
+% if repo.main_branch():
 <div class="toggable-title" onclick="toggle('commits')">
-  <a href="b/master/">commits (master)</a>
+  <a href="b/{{repo.main_branch()}}/">commits ({{repo.main_branch()}})</a>
 </div>
-%     kwargs = dict(repo = repo, start_ref = "refs/heads/master",
+%     kwargs = dict(repo = repo,
+%                   start_ref = "refs/heads/" + repo.main_branch(),
 %                   limit = repo.info.commits_in_summary,
 %                   shorten = shorten, repo_root = ".", offset = 0)
 %     include commit-list **kwargs
 <hr/>
 <div class="toggable-title" onclick="toggle('ls')">
-  <a href="b/master/t/">tree (master)</a>
+  <a href="b/{{repo.main_branch()}}/t/">tree ({{repo.main_branch()}})</a>
 </div>
-%     kwargs = dict(repo = repo, tree=repo.tree("master"),
-%                   treeroot="b/master/t", dirname=smstr.from_url(""))
+%     kwargs = dict(repo = repo, tree=repo.tree(repo.main_branch()),
+%                   treeroot="b/" + repo.main_branch() + "/t",
+%                   dirname=smstr.from_url(""))
 %     include tree-list **kwargs
 <hr/>
 % end