refactor(git): rework module around clearer Status and Repo split

lua/git/statusline.lua

@@ -0,0 +1,31 @@
+local repo = require("git.repo")
+
+local M = {}
+
+---@return string
+function M.render()
+    local r = repo.find()
+    if not r then
+        return ""
+    end
+    local name = vim.api.nvim_buf_get_name(0)
+    if name == "" then
+        return ""
+    end
+    local rel = vim.fs.relpath(r.worktree, vim.fn.resolve(name))
+    local list = rel and r.status.entries[rel]
+    if not list then
+        return ""
+    end
+    local parts = {}
+    for _, e in ipairs(list) do
+        table.insert(parts, string.format("%%#%s#%s%%*", e.hl, e.char))
+    end
+    return table.concat(parts, " ")
+end
+
+repo.on("refresh", function()
+    vim.cmd.redrawstatus({ bang = true })
+end)
+
+return M