[Emacs] 자동 TAGS 탐색?

예전에 Vim에서 tags 파일 경로를 부모 디렉토리들로 지정해서 자동으로 태그를 지정하는 방법을 포스팅 했던 적이 있다. 하지만 Emacs에서는 동일한 형태로 지정을 해서 사용하는게 안되었다. 이런 기능을 원했지만 검색으로 찾을 수는 없었다.

물론 Emacs도 tag file list를 지원하기 때문에 원하는 태그 파일 경로를 다수 지정해 줄 수 있다. 하지만 프로젝트가 생길 때 마다 설정을 추가해 주는건 너무나 귀찮은 일이다.

그래서 만들었다;;;

https://github.com/seorenn/dotemacs/blob/master/renn-explorefile.el

우선 elisp을 공부하는 겸 해서 만들었기 때문에 완벽하다고도 할 수 없고, 지저분하기도 하고, 일부 elisp에서 지원될지도 모를 함수를 따로 구현해 버린 쓸 데 없는 수고를 했을 수도 있다는 점을 밝힌다. 무엇보다 버그가 있을 것 같다. (T _ T)

이 코드에서 중요한 것은 explore-file이라는 함수로, 특정 파일을 현재 버퍼(파일)의 디렉토리에서 부터 상위 디렉토리로 차례차례로 옮겨가며 찾는 함수다. home-only라는 패러미터는 사용자의 홈디렉토리를 벗어나지 않기를 원한다면 nil이외의 값을 넣으면 된다.

최종적으로 사용하게 되는 explore-tags 라는 함수는 explore-file 함수를 호출해 TAGS 파일을 찾도록 한다. 그리고 찾은 경로를 특별한 리스트에 보관하는데 중복으로 태그를 찾지 않도록 하기 위함이다. 딱히 할 필요가 있을런지는 잘 모르겠지만.

그리고 explore-tag의 최종 단계에서 visit-tags-table 함수를 통해 찾아낸 TAGS파일을 등록시키는 방식으로 동작한다.

가장 마지막 라인에 python-mode가 될 때 마다 호출되도록 한 코드를 주석처리 해 놨는데 일종의 예이다. 원하는 모드에 explore-tag 를 등록하면 될 것이다. 예를 들어 C코드에서 사용할 것이라면
(add-hook 'c-mode-hook 'explore-tag)
이런 식으로 등록하면 될 것이다. 아마도...

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