Implement cache migrations

internal/cache/cache_migrations.go

@@ -5,9 +5,13 @@ import (
 	"fmt"
 
 	"golang.org/x/mod/semver"
+
+	"gitea.libretechconsulting.com/rmcguire/git-project-manager/internal/remotes/projects"
 )
 
-type migrationFunc func(c *Cache) error
+// Migrations funcs should return errors along with
+// number of records updated
+type migrationFunc func(c *Cache) (error, int)
 
 // Registry of migrations by version
 var migrations = map[string]map[string]migrationFunc{
@@ -20,38 +24,55 @@ var migrations = map[string]map[string]migrationFunc{
 // of cache read from disk.
 // Does not check to ensure migrations were successful,
 // only checks if a version has been achieved
-func (c *Cache) DoMigrations() error {
+func (c *Cache) DoMigrations() (error, int) {
 	c.lock.Lock()
 	defer c.lock.Unlock()
 	return c.doMigrations()
 }
 
-func (c *Cache) doMigrations() error {
+func (c *Cache) doMigrations() (error, int) {
 	var errs error
+	var migrated int
 	for version, migrationFuncs := range migrations {
+		var funcMigrated int
 		if semver.Compare(c.CacheVersion, version) < 0 {
 			for name, migration := range migrationFuncs {
-				err := migration(c)
+				err, numMigrated := migration(c)
 				if err != nil {
 					errs = errors.Join(
 						errs,
 						fmt.Errorf("%s - %s: %w", version, name, err),
 					)
 				}
+				funcMigrated += numMigrated
 			}
 
 			// We've reached a cache version, update the CacheVersion
 			// and write to disk
-			if errs == nil {
+			if errs == nil && funcMigrated > 0 {
 				c.CacheVersion = version
 				c.write()
 			}
 		}
+		migrated += funcMigrated
 	}
 
-	return errs
+	return errs, migrated
 }
 
-func v010_aliases(c *Cache) error {
-	return errors.New("unimplemented migration")
+func v010_aliases(c *Cache) (error, int) {
+	var aliasesMigrated int
+	var errs error
+	for i, a := range c.Aliases {
+		if a.ID == "" {
+			if a.Remote == "" {
+				errs = errors.Join(errs,
+					fmt.Errorf("alias %s [id:%d] has no remote", a.Alias, a.ProjectID))
+				continue
+			}
+			c.Aliases[i].ID = projects.MakeID(a.Remote, a.ProjectID)
+			aliasesMigrated++
+		}
+	}
+	return errs, aliasesMigrated
 }