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Let's say I'm creating many babel code blocks in a growing org-mode buffer and I'm tangling them all to a single file. However, I want certain blocks to appear above others. For example,

#+begin_src haskell :eval never :exports code :tangle fp41.hs module FP41 where import Data.List #+end_src #+begin_src haskell :eval never :exports code :tangle fp41.hs data Mood = Blah | Woot deriving (Show, Eq) changeMood Blah = Woot changeMood _ = Blah #+end_src

This works wonderfully, but I always have to watch what order the blocks are int to avoid spaghetti code. So what if I want to add another import way down in the buffer

#+begin_src haskell :eval never :exports code :tangle fp41.hs import GHC.Int #+end_src

but not have it below regular code in the tangled file? That is, I want it going to the header block in the tangled code file fp41.hs, grouped/following the previous last import. I could tangle them to separate files -- one for "header" stuff, one for code. If that's the route, is there any way then to automate combining them into a single file?

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    I think they get tangled in sequence: I don't know of any way to change that. But I think you can use Noweb. Commented Dec 23, 2021 at 0:55
  • As usual, thanks for the tip. noweb will work, although it requires my top source block containing the module info to refer to the desired named blocks below, i.e., the process isn't fire and forget. Commented Dec 23, 2021 at 4:06

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There doesn't appear to be an exact solution, but the next-best thing would be something like this

* Test :PROPERTIES: :header-args: :noweb-sep "\n\n" :END: #+begin_src haskell :eval never :tangle nowebtest.hs :noweb yes module FP41 where import Data.List <<ghcInt-imp>> <<mood>> #+end_src #+name: mood #+begin_src haskell :eval never data Mood = Blah | Woot deriving (Show, Eq) changeMood Blah = Woot changeMood _ = Blah #+end_src #+name: ghcInt-imp #+begin_src haskell :eval never import GHC.Int #+end_src

following the noweb docs here. This produces what's needed

module FP41 where import Data.List import GHC.Int data Mood = Blah | Woot deriving (Show, Eq) changeMood Blah = Woot changeMood _ = Blah

although that :noweb-sep doesn't seem to work and I don't find anything on it other than it's mention.

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  • You also could look at :noweb-ref instead of using name for the references. A benefit is that you could have multiple blocks all with the same ref - in this case say ghcInt-imp and have many blocks being placed in the import. Commented Jun 24, 2024 at 14:46

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