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author | Domen Kožar <domen@dev.si> | 2019-01-03 16:31:00 +0000 |
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committer | Domen Kožar <domen@dev.si> | 2019-01-03 16:37:09 +0000 |
commit | 6da4584acf4478b04457d57f3881b3aca7d3f7b6 (patch) | |
tree | afc2f73ef646ee6b8be2aa0507f1701a7a79642c /pkgs/development/compilers/elm/README.md | |
parent | 24d1d6cf9d9bf539bd0cf79b76f69142067f1381 (diff) | |
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Elm: automate packaging with elm2nix
- rewrite documentation - automate whole process into update.sh - remove all legacy snippets
Diffstat (limited to 'pkgs/development/compilers/elm/README.md')
-rw-r--r-- | pkgs/development/compilers/elm/README.md | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/pkgs/development/compilers/elm/README.md b/pkgs/development/compilers/elm/README.md new file mode 100644 index 000000000000..f0254d0f9547 --- /dev/null +++ b/pkgs/development/compilers/elm/README.md @@ -0,0 +1,24 @@ +# To update Elm: + +Modify revision in ./update.sh and run it + +# Notes about the build process: + +The elm binary embeds a piece of pre-compiled elm code, used by 'elm +reactor'. This means that the build process for 'elm' effectively +executes 'elm make'. that in turn expects to retrieve the elm +dependencies of that code (elm/core, etc.) from +package.elm-lang.org, as well as a cached bit of metadata +(versions.dat). + +The makeDotElm function lets us retrieve these dependencies in the +standard nix way. we have to copy them in (rather than symlink) and +make them writable because the elm compiler writes other .dat files +alongside the source code. versions.dat was produced during an +impure build of this same code; the build complains that it can't +update this cache, but continues past that warning. + +Finally, we set ELM_HOME to point to these pre-fetched artifacts so +that the default of ~/.elm isn't used. + +More: https://blog.hercules-ci.com/elm/2019/01/03/elm2nix-0.1/ |