refactor(git): drive :G dispatch from buffer content

lua/git/util.lua

@@ -2,16 +2,19 @@ local M = {}
 
 ---@class ow.Git.Util.ScratchOpts
 ---@field name string?
----@field bufhidden ("hide"|"wipe")?
+---@field bufhidden ("hide"|"wipe"|"delete")?
+---@field buftype ("nofile"|"acwrite"|"nowrite")?
+---@field modifiable boolean?
 
 ---@param buf integer
 ---@param opts ow.Git.Util.ScratchOpts
-local function setup_scratch(buf, opts)
-    vim.bo[buf].buftype = "nofile"
+function M.setup_scratch(buf, opts)
+    vim.bo[buf].buftype = opts.buftype or "nofile"
     vim.bo[buf].bufhidden = opts.bufhidden or "wipe"
     vim.bo[buf].swapfile = false
-    vim.bo[buf].modifiable = false
+    vim.bo[buf].modifiable = opts.modifiable == true
     vim.bo[buf].modified = false
+    vim.bo[buf].buflisted = false
     if opts.name then
         pcall(vim.api.nvim_buf_set_name, buf, opts.name)
     end
@@ -52,7 +55,7 @@ end
 function M.new_scratch(opts)
     opts = opts or {}
     local buf = vim.api.nvim_create_buf(false, true)
-    setup_scratch(buf, opts)
+    M.setup_scratch(buf, opts)
     return buf, M.place_buf(buf, opts.split)
 end
 
@@ -188,6 +191,15 @@ end
 ---@field silent boolean?
 ---@field on_done fun(stdout: string?)?
 
+---@param args string[]
+---@param opts ow.Git.Util.ExecOpts?
+---@return string?
+function M.git(args, opts)
+    local cmd = { "git" }
+    vim.list_extend(cmd, args)
+    return M.exec(cmd, opts)
+end
+
 ---@param cmd string[]
 ---@param opts ow.Git.Util.ExecOpts?
 ---@return string?