Custom cabal builds for pandoc 3.*?

Custom cabal builds for pandoc 3.*?

[Jim Pryor]

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I used to follow the instructions at 
<https://pandoc.org/installing.html#custom-cabal-method> to build pandoc 
with the cabal configure `--flags="embed_data_files lua53"`.

Since `git pull`ing to the pandoc 3.* source tree, this no longer builds an 
executable. I see from the Pandoc 3.0 announcement on this list that the 
packaging has split in some ways.

Is it still possible to build all the components with custom cabal 
configure flags? How do I go about it? Can I just cd to the `pandoc-cli` 
subdirectory and do the following there:

```
cabal update

cabal install --only-dependencies

cabal configure --prefix=/usr/local --flags="embed_data_files lua53"

cabal build

./dist-newstyle/build/x86_64-osx/ghc-*/pandoc-*/x/pandoc/build/pandoc/pandoc 
--version

```

Or do I have to first run those steps in the top-level directory, then do 
`cabal install`, then repeat them in the `pandoc-cli` subdirectory? When I 
try to only do the steps in the `pandoc-cli` subdirectory, it seems like a 
binary version of the main `pandoc` library is being downloaded, rather 
than one built using my custom configure flags.

Is the option to build using the Lua 5.3 engine still available? I've been 
fiddling around and it seems like however I do the build, I end up with a 
pandoc executable that says it uses the Lua 5.4 engine.


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Re: Custom cabal builds for pandoc 3.*?

[John MacFarlane]

> On Mar 15, 2023, at 9:11 AM, Jim Pryor <jim.pryor.nyu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> 
> I used to follow the instructions at <https://pandoc.org/installing.html#custom-cabal-method> to build pandoc with the cabal configure `--flags="embed_data_files lua53"`.
> 
> Since `git pull`ing to the pandoc 3.* source tree, this no longer builds an executable. I see from the Pandoc 3.0 announcement on this list that the packaging has split in some ways.
> 
> Is it still possible to build all the components with custom cabal configure flags? How do I go about it? Can I just cd to the `pandoc-cli` subdirectory and do the following there:
> 
> ```
> cabal update
> cabal install --only-dependencies
> 
> cabal configure --prefix=/usr/local --flags="embed_data_files lua53"
> 
> cabal build
> 
> ./dist-newstyle/build/x86_64-osx/ghc-*/pandoc-*/x/pandoc/build/pandoc/pandoc --version
> 
> ```


Something like this should work, but there have been changes in both pandoc and cabal since the instructions were composed, so they may need some adjusting. Try it?

You'll want to add lua and server to your flags if you want the executable to have Lua and server support, respectively.  lua53 is no longer available, sorry.

> 
> Or do I have to first run those steps in the top-level directory, then do `cabal install`, then repeat them in the `pandoc-cli` subdirectory? When I try to only do the steps in the `pandoc-cli` subdirectory, it seems like a binary version of the main `pandoc` library is being downloaded, rather than one built using my custom configure flags.

cabal never downloads binaries, only source. If it's happening quickly, it could be because your global cabal store already contains a built version of the library.


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Re: Custom cabal builds for pandoc 3.*?

[Jim Pryor]

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Thanks for the quick reply. It looks like I can just cd into the 
`pandoc-cli` subdirectory and do the configure and build from there. 
Doesn't seem to be necessary to first do the build (with or without 
install) from the toplevel directory. Not sure how to confirm that the 
library was built with the `embed_data_files` option though. Also some 
tentativeness in these reports because I was experimenting a lot and not 
100% sure I'm right that this is what works in a clean download of the 
source repo.

Bummer that ongoing development of Pandoc is Lua 5.4-only. I've got other 
dependencies on Lua 5.3, and don't want to reconfigure my Lua-thinking and 
libraries yet. I realize that Pandoc bundles its own version of the engine, 
so it's possible to have a different version Lua CLI installed. Reluctance 
is just due to my cognitive limits. Suppose I'll stick with Pandoc 2.19.2 
for the time being.

On Wednesday, March 15, 2023 at 12:31:17 PM UTC-4 John MacFarlane wrote:

>
>
> > On Mar 15, 2023, at 9:11 AM, Jim Pryor <jim.pr...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> > 
> > I used to follow the instructions at <
> https://pandoc.org/installing.html#custom-cabal-method> to build pandoc 
> with the cabal configure `--flags="embed_data_files lua53"`.
> > 
> > Since `git pull`ing to the pandoc 3.* source tree, this no longer builds 
> an executable. I see from the Pandoc 3.0 announcement on this list that the 
> packaging has split in some ways.
> > 
> > Is it still possible to build all the components with custom cabal 
> configure flags? How do I go about it? Can I just cd to the `pandoc-cli` 
> subdirectory and do the following there:
> > 
> > ```
> > cabal update
> > cabal install --only-dependencies
> > 
> > cabal configure --prefix=/usr/local --flags="embed_data_files lua53"
> > 
> > cabal build
> > 
> > 
> ./dist-newstyle/build/x86_64-osx/ghc-*/pandoc-*/x/pandoc/build/pandoc/pandoc 
> --version
> > 
> > ```
>
>
> Something like this should work, but there have been changes in both 
> pandoc and cabal since the instructions were composed, so they may need 
> some adjusting. Try it?
>
> You'll want to add lua and server to your flags if you want the executable 
> to have Lua and server support, respectively. lua53 is no longer available, 
> sorry.
>
> > 
> > Or do I have to first run those steps in the top-level directory, then 
> do `cabal install`, then repeat them in the `pandoc-cli` subdirectory? When 
> I try to only do the steps in the `pandoc-cli` subdirectory, it seems like 
> a binary version of the main `pandoc` library is being downloaded, rather 
> than one built using my custom configure flags.
>
> cabal never downloads binaries, only source. If it's happening quickly, it 
> could be because your global cabal store already contains a built version 
> of the library.
>
>
>

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Re: Custom cabal builds for pandoc 3.*?

[John MacFarlane]

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> On Mar 15, 2023, at 10:43 AM, Jim Pryor <jim.pryor.nyu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> 
> Thanks for the quick reply. It looks like I can just cd into the `pandoc-cli` subdirectory and do the configure and build from there. Doesn't seem to be necessary to first do the build (with or without install) from the toplevel directory. Not sure how to confirm that the library was built with the `embed_data_files` option though

You could try

strings /path/to/pandoc | grep ‘\$title\$’

which should give you output if the templates are baked in to the binary.


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Re: Custom cabal builds for pandoc 3.*?

[Jim Pryor]

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Thanks, yes it looks like the data files were embedded.

On Wed, Mar 15, 2023, 6:37 PM John MacFarlane <fiddlosopher-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:

>
>
> On Mar 15, 2023, at 10:43 AM, Jim Pryor <jim.pryor.nyu-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> Thanks for the quick reply. It looks like I can just cd into the
> `pandoc-cli` subdirectory and do the configure and build from there.
> Doesn't seem to be necessary to first do the build (with or without
> install) from the toplevel directory. Not sure how to confirm that the
> library was built with the `embed_data_files` option though
>
>
> You could try
>
> strings /path/to/pandoc | grep ‘\$title\$’
>
> which should give you output if the templates are baked in to the binary.
>
>
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> .
>

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