feat(git/statusline): expose status via b:git_status, opt-in via enable()

lua/git/repo.lua

@@ -220,24 +220,26 @@ end
 
 ---@return string?
 function Repo:head()
-    local f = io.open(vim.fs.joinpath(self.gitdir, "HEAD"), "r")
-    if not f then
+    return self:get_cached("head", function(self)
+        local f = io.open(vim.fs.joinpath(self.gitdir, "HEAD"), "r")
+        if not f then
+            return nil
+        end
+        local first = f:read("*l")
+        f:close()
+        if not first then
+            return nil
+        end
+        local branch = first:match("^ref:%s*refs/heads/(%S+)")
+        if branch then
+            return branch
+        end
+        local sha = first:match("^(%x+)")
+        if sha then
+            return sha:sub(1, 7)
+        end
         return nil
-    end
-    local first = f:read("*l")
-    f:close()
-    if not first then
-        return nil
-    end
-    local branch = first:match("^ref:%s*refs/heads/(%S+)")
-    if branch then
-        return branch
-    end
-    local sha = first:match("^(%x+)")
-    if sha then
-        return sha:sub(1, 7)
-    end
-    return nil
+    end)
 end
 
 ---@return string[]
@@ -408,7 +410,7 @@ end
 ---@return string
 local function path_for_buf(buf)
     local path = vim.api.nvim_buf_get_name(buf)
-    if path == "" or path:match("^%a+://") then
+    if path == "" or util.is_uri(path) then
         return vim.fn.getcwd()
     end
     return vim.fn.resolve(path)
@@ -514,7 +516,7 @@ local function is_worktree_buf(buf)
         return false
     end
     local path = vim.api.nvim_buf_get_name(buf)
-    return path ~= "" and not path:match("^%a+://")
+    return path ~= "" and not util.is_uri(path)
 end
 
 ---@param buf? integer