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Say I have 2 files, file1.org and file2.org, both tangling to source.el, which I arranged to look like this:

;; [[file:file1.org::ha][ha]]
(defun the-first-block()    )
;; ha ends here


;; [[file:file2.org::hh][hh]]
(defun the-first-block()  )
;; hh ends here

;; [[file:file1.org::+begin_src emacs-lisp][No heading:2]]
(defun the-second-block())
;; No heading:2 ends here

My question is, is there a way that I can tangle file2.org, and it does not overwrite the whole file source.el, but only overwite the

;; [[file:file2.org::hh][hh]]
(defun the-first-block()  )
;; hh ends here

part.

ps. background: I was trying to write code directly from org-roam's zettel files. I'm aware that similar effect can be achived with noweb and have all code blocks in the same file. I'm looking for a way to do it with source blocks in different files.

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  • If they both tangle to source.el, they will step on each other. Why not make them tangle to different files (file1.el, file2.el, ...) and then concatenate them all into source.el? I usually write simple Makefiles for such purposes and run them with M-x compile: the Makefile knows if a file has been updated, so it can do the concatenation if necessary.
    – NickD
    Commented Apr 27 at 4:45
  • This is interesting, and you can sure jump back/detangle from source.el as the links in the comments still points to the right org file. Still having to write makefile is a bit of additional complexity but I guess maybe a layer can be built to automate that.
    – Herman He
    Commented Apr 27 at 21:11

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