work around dumb-jump with git grep

my-dumb-jump.el

;; FIXME:git grepが日本語を含むパスを検索できないのためのwork around
;;       外部コマンド実行時にcdで検索パスを決めるようにした
(defun dumb-jump-generate-git-grep-command (look-for cur-file proj regexes lang exclude-paths)
  "Generate the git grep response based on the needle LOOK-FOR in the directory PROJ."
  (let* ((filled-regexes (dumb-jump-populate-regexes look-for regexes 'git-grep))
         (ggtypes (when (f-ext cur-file) (dumb-jump-get-git-grep-type-by-language lang)))
         (cmd (concat "cd "
                      proj
                      ";"
                      dumb-jump-git-grep-cmd
                      " --color=never --line-number"
                      (if dumb-jump-git-grep-search-untracked
                          " --untracked"
                          "")
                      " -E"))
         (fileexps (s-join " " (--map (format "\"*.%s\"" it) ggtypes)))
         (exclude-args (s-join " "
                               (--map (shell-quote-argument (concat ":(exclude)" it))
                                      exclude-paths)))
         (regex-args (shell-quote-argument (s-join "|" filled-regexes))))
    (if (= (length regexes) 0)
        ""
        (dumb-jump-concat-command cmd regex-args "--" fileexps exclude-args))))