Add support for ignoring modules when syncing (#143)

Author: toastwaffle

ChangeLog

@@ -1,3 +1,7 @@
+Version 1.16.0
+--------------
+    * Add support for ignoring modules when syncing (#143)
+
 Version 1.15.1
 --------------
     * Correctly compute visibility of target given a child package wildcard (#141)

PUKU_VERSION

@@ -1 +1 @@
-1.15.1
+1.16.0

config/config.go

@@ -43,6 +43,9 @@ type Config struct {
 	Stop                *bool                  `json:"stop"`
 	EnsureSubincludes   *bool                  `json:"ensureSubincludes"`
 	ExcludeBuiltinKinds []string               `json:"excludeBuiltinKinds"`
+	// This field allows skipping syncing certain packages into the BUILD file as go_repo targets,
+	// Which can help deal with transitive dependencies that are not actually needed.
+	IgnoreModulesForSync []string `json:"ignoreModulesForSync"`
 }
 
 // TODO we should reload this during plz watch so this probably needs to become a member of Update
@@ -209,3 +212,10 @@ func (c *Config) GetKind(kind string) *kinds.Kind {
 	}
 	return nil
 }
+
+func (c *Config) GetIgnoreModulesForSync() []string {
+	if c.base != nil {
+		return append(c.IgnoreModulesForSync, c.base.GetIgnoreModulesForSync()...)
+	}
+	return c.IgnoreModulesForSync
+}

sync/sync.go

@@ -122,8 +122,17 @@ func (s *syncer) syncModFile(conf *config.Config, file *build.File, existingRule
 		}
 	}
 
+	ignoredModules := map[string]bool{}
+	for _, mod := range conf.GetIgnoreModulesForSync() {
+		ignoredModules[mod] = true
+	}
+
 	// Check all modules listed in go.mod
 	for _, req := range f.Require {
+		if ignoredModules[req.Mod.Path] {
+			continue
+		}
+
 		// Find any matching replace directive
 		var matchingReplace *modfile.Replace
 		for _, replace := range f.Replace {