Paul Cadman 7a9b21a4f8 External package dependencies (#2272) ... This PR adds external git dependency support to the Juvix package format. ## New dependency Git item You can now add a `git` block to the dependencies list: ```yaml name: HelloWorld main: HelloWorld.juvix dependencies: - .juvix-build/stdlib - git: url: https://my.git.repo name: myGitRepo ref: main version: 0.1.0 ``` Git block required fields: * `url`: The URL of the git repository * `ref`: The git reference that should be checked out * `name`: The name for the dependency. This is used to name the directory of the clone, it is required. Perhaps we could come up with a way to automatically name the clone directory. Current ideas are to somehow encode the URL / ref combination or use a UUID. However there's some value in having the clone directory named in a friendly way. NB: * The values of the `name` fields must be unique among the git blocks in the dependencies list. ## Behaviour When dependencies for a package are registered, at the beginning of the compiler pipeline, all remote dependencies are processed: 1. If it doesn't already exist, the remote dependency is cloned to `.juvix-build/deps/$name` 2. `git fetch` is run in the clone 3. `git checkout` at the specified `ref` is run in the clone The clone is then processed by the PathResolver in the same way as path dependencies. NB: * Remote dependencies of transitive dependencies are also processed. * The `git fetch` step is required for the case where the remote is updated. In this case we want the user to be able to update the `ref` field. ## Errors 1. Missing fields in the Git dependency block are YAML parse errors 2. Duplicate `name` values in the dependencies list is an error thrown when the package file is processed 3. The `ref` doesn't exist in the clone or the clone directory is otherwise corrupt. An error with a suggestion to `juvix clean` is given. The package file path is used as the location in the error message. 4. Other `git` command errors (command not found, etc.), a more verbose error is given with the arguments that were passed to the git command. ## Future work 1. Add an offline mode 2. Add a lock file mechanism that resolves branch/tag git refs to commit hashes * closes https://github.com/anoma/juvix/issues/2083 --------- Co-authored-by: Jan Mas Rovira <janmasrovira@gmail.com>		2023-09-01 12:37:06 +01:00
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Negative.hs	Report termination errors after typechecking (#2318)	2023-08-30 16:38:59 +02:00
Positive.hs	External package dependencies (#2272)	2023-09-01 12:37:06 +01:00