feat(git): replace vim-fugitive with custom git module

lua/git/log_win.lua

@@ -0,0 +1,54 @@
+local log = require("log")
+local repo = require("git.repo")
+
+local M = {}
+
+local LOG_FORMAT = "%h %ad {%an}%d %s"
+
+function M.show()
+    local path = vim.api.nvim_buf_get_name(0)
+    if path == "" then
+        path = vim.fn.getcwd()
+    end
+    local _, worktree = repo.resolve(path)
+    if not worktree then
+        log.warning("not in a git repository")
+        return
+    end
+
+    local result = vim.system({
+        "git",
+        "log",
+        "--graph",
+        "--all",
+        "--decorate",
+        "--date=short",
+        "--format=format:" .. LOG_FORMAT,
+    }, { cwd = worktree, text = true }):wait()
+    if result.code ~= 0 then
+        log.error("git log failed: %s", result.stderr or "")
+        return
+    end
+
+    local lines = vim.split(
+        result.stdout or "",
+        "\n",
+        { plain = true, trimempty = false }
+    )
+    if #lines > 0 and lines[#lines] == "" then
+        table.remove(lines)
+    end
+
+    vim.cmd("new")
+    local buf = vim.api.nvim_get_current_buf()
+    vim.bo[buf].buftype = "nofile"
+    vim.bo[buf].bufhidden = "hide"
+    vim.bo[buf].swapfile = false
+    vim.api.nvim_buf_set_lines(buf, 0, -1, false, lines)
+    vim.bo[buf].modifiable = false
+    vim.bo[buf].modified = false
+    vim.b[buf].git_worktree = worktree
+    vim.bo[buf].filetype = "gitlog"
+end
+
+return M