fix(git): local plugin fixes (#1624)

## Description

As I described in
https://github.com/folke/lazy.nvim/pull/1512#issuecomment-2212474372,
this makes it so that local plugins will only show as needing updates if
the local branch is behind the upstream branch. This is done by checking
the output of the `git log` command, and only setting `plugin._.updates`
if the output is not empty.

This seems to solve my issue where local plugins with unpushed changes
always show as needing updates, but if there's a easier/better way of
doing it then please feel free to edit/close this. Or if you don't agree
that the current behaviour is a bug, then that's also fine - it's not a
big deal and I can easily just ignore the "updates available" notice.

I also came across a minor issue where the plugin diff view (press `d`)
compares the wrong commits for local plugins, because
[lua/lazy/view/init.lua](c771cf4928/lua/lazy/view/init.lua (L268))
always uses `get_target`. I fixed this by moving `get_local_target` into
`get_target` - I think this is simpler and more straightforward than the
alternative of adding a ternary everywhere `get_target` is called.

This second bugfix is a very small change, so I've just included it
here, but I'm happy to make a second PR if you'd like.

## Related Issue(s)

Related PR: #1512

lua/lazy/manage/checker.lua

@@ -35,7 +35,9 @@ end
 function M.fast_check(opts)
   opts = opts or {}
   for _, plugin in pairs(Config.plugins) do
-    if not plugin.pin and not plugin.dev and plugin._.installed then
+    -- don't check local plugins here, since we mark them as needing updates
+    -- only if local is behind upstream (if the git log task gives no output)
+    if plugin._.installed and not (plugin.pin or plugin._.is_local) then
       plugin._.updates = nil
       local info = Git.info(plugin.dir)
       local ok, target = pcall(Git.get_target, plugin)

lua/lazy/manage/git.lua

@@ -116,6 +116,12 @@ end
 ---@param plugin LazyPlugin
 ---@return GitInfo?
 function M.get_target(plugin)
+  if plugin._.is_local then
+    local info = M.info(plugin.dir)
+    local branch = assert(info and info.branch or M.get_branch(plugin))
+    return { branch = branch, commit = M.get_commit(plugin.dir, branch, true) }
+  end
+
   local branch = assert(M.get_branch(plugin))
 
   if plugin.commit then
@@ -144,15 +150,6 @@ function M.get_target(plugin)
       }
     end
   end
-  ---@diagnostic disable-next-line: return-type-mismatch
-  return { branch = branch, commit = M.get_commit(plugin.dir, branch, true) }
-end
-
----@param plugin LazyPlugin
----@return GitInfo?
-function M.get_local_target(plugin)
-  local info = M.info(plugin.dir)
-  local branch = assert(info and info.branch or M.get_branch(plugin))
   return { branch = branch, commit = M.get_commit(plugin.dir, branch, true) }
 end
 

lua/lazy/manage/task/git.lua

@@ -32,11 +32,13 @@ M.log = {
       "--no-show-signature",
     }
 
+    local info, target
+
     if opts.updated then
       table.insert(args, self.plugin._.updated.from .. ".." .. (self.plugin._.updated.to or "HEAD"))
     elseif opts.check then
-      local info = assert(Git.info(self.plugin.dir))
-      local target = assert(self.plugin._.is_local and Git.get_local_target(self.plugin) or Git.get_target(self.plugin))
+      info = assert(Git.info(self.plugin.dir))
+      target = assert(Git.get_target(self.plugin))
       if not target.commit then
         for k, v in pairs(target) do
           error(k .. " '" .. v .. "' not found")
@@ -44,6 +46,7 @@ M.log = {
         error("no target commit found")
       end
       assert(target.commit, self.plugin.name .. " " .. target.branch)
+      if not self.plugin._.is_local then
         if Git.eq(info, target) then
           if Config.options.checker.check_pinned then
             local last_commit = Git.get_commit(self.plugin.dir, target.branch, true)
@@ -54,6 +57,7 @@ M.log = {
         else
           self.plugin._.updates = { from = info, to = target }
         end
+      end
       table.insert(args, info.commit .. ".." .. target.commit)
     else
       vim.list_extend(args, opts.args or Config.options.git.log)
@@ -63,6 +67,14 @@ M.log = {
       args = args,
       cwd = self.plugin.dir,
     })
+
+    -- for local plugins, mark as needing updates only if local is
+    -- behind upstream, i.e. if git log gave no output
+    if opts.check and self.plugin._.is_local then
+      if not vim.tbl_isempty(self:get_log()) then
+        self.plugin._.updates = { from = info, to = target }
+      end
+    end
   end,
 }