refactor: move things to packages

internal/forge/forge.go

@@ -0,0 +1,61 @@
+package forge
+
+import (
+	"context"
+
+	"github.com/go-git/go-git/v5/plumbing/transport"
+
+	"github.com/apricote/releaser-pleaser/internal/git"
+	"github.com/apricote/releaser-pleaser/internal/releasepr"
+)
+
+type Forge interface {
+	RepoURL() string
+	CloneURL() string
+	ReleaseURL(version string) string
+
+	GitAuth() transport.AuthMethod
+
+	// LatestTags returns the last stable tag created on the main branch. If there is a more recent pre-release tag,
+	// that is also returned. If no tag is found, it returns nil.
+	LatestTags(context.Context) (git.Releases, error)
+
+	// CommitsSince returns all commits to main branch after the Tag. The tag can be `nil`, in which case this
+	// function should return all commits.
+	CommitsSince(context.Context, *git.Tag) ([]git.Commit, error)
+
+	// EnsureLabelsExist verifies that all desired labels are available on the repository. If labels are missing, they
+	// are created them.
+	EnsureLabelsExist(context.Context, []releasepr.Label) error
+
+	// PullRequestForBranch returns the open pull request between the branch and Options.BaseBranch. If no open PR
+	// exists, it returns nil.
+	PullRequestForBranch(context.Context, string) (*releasepr.ReleasePullRequest, error)
+
+	// CreatePullRequest opens a new pull/merge request for the ReleasePullRequest.
+	CreatePullRequest(context.Context, *releasepr.ReleasePullRequest) error
+
+	// UpdatePullRequest updates the pull/merge request identified through the ID of
+	// the ReleasePullRequest to the current description and title.
+	UpdatePullRequest(context.Context, *releasepr.ReleasePullRequest) error
+
+	// SetPullRequestLabels updates the pull/merge request identified through the ID of
+	// the ReleasePullRequest to the current labels.
+	SetPullRequestLabels(ctx context.Context, pr *releasepr.ReleasePullRequest, remove, add []releasepr.Label) error
+
+	// ClosePullRequest closes the pull/merge request identified through the ID of
+	// the ReleasePullRequest, as it is no longer required.
+	ClosePullRequest(context.Context, *releasepr.ReleasePullRequest) error
+
+	// PendingReleases returns a list of ReleasePullRequest. The list should contain all pull/merge requests that are
+	// merged and have the matching label.
+	PendingReleases(context.Context, releasepr.Label) ([]*releasepr.ReleasePullRequest, error)
+
+	// CreateRelease creates a release on the Forge, pointing at the commit with the passed in details.
+	CreateRelease(ctx context.Context, commit git.Commit, title, changelog string, prerelease, latest bool) error
+}
+
+type Options struct {
+	Repository string
+	BaseBranch string
+}