refactor: move things to packages (#39)

internal/versioning/versioning.go

@@ -0,0 +1,56 @@
+package versioning
+
+import (
+	"github.com/leodido/go-conventionalcommits"
+
+	"github.com/apricote/releaser-pleaser/internal/git"
+)
+
+type Strategy = func(git.Releases, VersionBump, NextVersionType) (string, error)
+
+type VersionBump conventionalcommits.VersionBump
+
+const (
+	UnknownVersion VersionBump = iota
+	PatchVersion
+	MinorVersion
+	MajorVersion
+)
+
+type NextVersionType int
+
+const (
+	NextVersionTypeUndefined NextVersionType = iota
+	NextVersionTypeNormal
+	NextVersionTypeRC
+	NextVersionTypeBeta
+	NextVersionTypeAlpha
+)
+
+func (n NextVersionType) String() string {
+	switch n {
+	case NextVersionTypeUndefined:
+		return "undefined"
+	case NextVersionTypeNormal:
+		return "normal"
+	case NextVersionTypeRC:
+		return "rc"
+	case NextVersionTypeBeta:
+		return "beta"
+	case NextVersionTypeAlpha:
+		return "alpha"
+	default:
+		return ""
+	}
+}
+
+func (n NextVersionType) IsPrerelease() bool {
+	switch n {
+	case NextVersionTypeRC, NextVersionTypeBeta, NextVersionTypeAlpha:
+		return true
+	case NextVersionTypeUndefined, NextVersionTypeNormal:
+		return false
+	default:
+		return false
+	}
+}