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25 lines
971 B
Markdown
25 lines
971 B
Markdown
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# To update Elm:
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Modify revision in ./update.sh and run it
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# Notes about the build process:
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The elm binary embeds a piece of pre-compiled elm code, used by 'elm
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reactor'. This means that the build process for 'elm' effectively
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executes 'elm make'. that in turn expects to retrieve the elm
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dependencies of that code (elm/core, etc.) from
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package.elm-lang.org, as well as a cached bit of metadata
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(versions.dat).
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The makeDotElm function lets us retrieve these dependencies in the
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standard nix way. we have to copy them in (rather than symlink) and
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make them writable because the elm compiler writes other .dat files
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alongside the source code. versions.dat was produced during an
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impure build of this same code; the build complains that it can't
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update this cache, but continues past that warning.
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Finally, we set ELM_HOME to point to these pre-fetched artifacts so
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that the default of ~/.elm isn't used.
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More: https://blog.hercules-ci.com/elm/2019/01/03/elm2nix-0.1/
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