Commits on Aug 20, 2024

1. Add migrate-list subcommand that lists available migrations …

   Here, add a new `migrate-list` command to the River CLI. It prints the
   versions and names of available migrations along with an indicator as to
   the current state of the database:
   
       $ go run ./cmd/river migrate-list --database-url postgres:///river_dev
         001 create river migration
         002 initial schema
         003 river job tags non null
         004 pending and more
       * 005 migration unique client
   
   It's pretty far from a high priority feature, but I started it a few
   weeks ago and I figured I may as well finish it. I started because I
   realized that despite having a `migrate-get` command, there was no way
   to figure out what migrations actually existed before you ran it.
   
   `migrate-list` currently requires a `--database-url`, but later I want
   to put in an alternate version that can work without one too. A
   complication with that is that I want to build a system that can hint on
   the desired database system (currently detected based off URL scheme) in
   case we add SQLite later. I'm thinking that we'll be able to add an
   option like `--database postgres` or `--engine postgres` that can act as
   an alternative to `--database-url`. This will also be useful for
   `migrate-get`, which also currently has no answer for this.
   
   I bring in a test convention for CLI commands so we can start trying to
   check with more authority that things like expected output stay stable.
   (Previously, we weren't testing commands except to vet that they will
   run successfully in CI.) This approach uses mocks because we still have
   no way of reusing database-based testing infrastructure outside the main
   package (eventually some of it should go into `rivershared`), but
   despite that, it should give us reasonable assuredness for now.

   

   brandur committed Aug 20, 2024
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