remove a gross type hack

internal/config/alias_config.go

@@ -1,10 +1,7 @@
 package config
 
 import (
-	"errors"
 	"fmt"
-
-	"gopkg.in/yaml.v3"
 )
 
 type AliasConfig struct {
@@ -28,44 +25,6 @@ func (a *AliasConfig) Get(alias string) string {
 }
 
 func (a *AliasConfig) Add(alias, expansion string) error {
-	if a.Root == nil {
-		// TODO awful hack bad type conversion i'm sorry. this is to support an empty aliases key and
-		// ought to be generalized into ConfigMap or fileConfig (via Config interface) itself.
-		entry, err := a.Parent.(*fileConfig).FindEntry("aliases")
-
-		var notFound *NotFoundError
-
-		if err != nil && !errors.As(err, &notFound) {
-			return err
-		}
-		valueNode := &yaml.Node{
-			Kind:  yaml.MappingNode,
-			Value: "",
-		}
-
-		a.Root = valueNode
-		if errors.As(err, &notFound) {
-			// No aliases: key; just append new aliases key and empty map to end
-			keyNode := &yaml.Node{
-				Kind:  yaml.ScalarNode,
-				Value: "aliases",
-			}
-			a.Parent.Root().Content = append(a.Parent.Root().Content, keyNode, valueNode)
-		} else {
-			// Empty aliases; inject new value node after existing aliases key
-			newContent := []*yaml.Node{}
-			for i := 0; i < len(a.Parent.Root().Content); i++ {
-				if i == entry.Index {
-					newContent = append(newContent, entry.KeyNode, valueNode)
-					i++
-				} else {
-					newContent = append(newContent, a.Parent.Root().Content[i])
-				}
-			}
-			a.Parent.Root().Content = newContent
-		}
-	}
-
 	err := a.SetStringValue(alias, expansion)
 	if err != nil {
 		return fmt.Errorf("failed to update config: %w", err)

internal/config/config_type.go

@@ -191,34 +191,57 @@ func (c *fileConfig) Write() error {
 }
 
 func (c *fileConfig) Aliases() (*AliasConfig, error) {
+	// The complexity here is for dealing with either a missing or empty aliases key. It's something
+	// we'll likely want for other config sections at some point.
 	entry, err := c.FindEntry("aliases")
 	var nfe *NotFoundError
-	if err != nil && errors.As(err, &nfe) {
-		// TODO does this make sense at all? want to simulate existing but empty key.
-		return &AliasConfig{Parent: c}, nil
-	}
-
-	aliasConfig, err := c.parseAliasConfig(entry.ValueNode)
-	if err != nil {
+	notFound := errors.As(err, &nfe)
+	if err != nil && !notFound {
 		return nil, err
 	}
 
-	return aliasConfig, nil
-}
+	toInsert := []*yaml.Node{}
 
-func (c *fileConfig) parseAliasConfig(aliasesEntry *yaml.Node) (*AliasConfig, error) {
-	if aliasesEntry.Kind != yaml.MappingNode {
-		return &AliasConfig{
-			Parent: c,
-		}, nil
+	keyNode := entry.KeyNode
+	valueNode := entry.ValueNode
+
+	if keyNode == nil {
+		keyNode = &yaml.Node{
+			Kind:  yaml.ScalarNode,
+			Value: "aliases",
+		}
+		toInsert = append(toInsert, keyNode)
 	}
 
-	aliasConfig := AliasConfig{
+	if valueNode == nil || valueNode.Kind != yaml.MappingNode {
+		valueNode = &yaml.Node{
+			Kind:  yaml.MappingNode,
+			Value: "",
+		}
+		toInsert = append(toInsert, valueNode)
+	}
+
+	if len(toInsert) > 0 {
+		newContent := []*yaml.Node{}
+		if notFound {
+			newContent = append(c.Root().Content, keyNode, valueNode)
+		} else {
+			for i := 0; i < len(c.Root().Content); i++ {
+				if i == entry.Index {
+					newContent = append(newContent, keyNode, valueNode)
+					i++
+				} else {
+					newContent = append(newContent, c.Root().Content[i])
+				}
+			}
+		}
+		c.Root().Content = newContent
+	}
+
+	return &AliasConfig{
 		Parent:    c,
-		ConfigMap: ConfigMap{Root: aliasesEntry},
-	}
-
-	return &aliasConfig, nil
+		ConfigMap: ConfigMap{Root: valueNode},
+	}, nil
 }
 
 func (c *fileConfig) Hosts() ([]*HostConfig, error) {