Merge pull request #549 from tmc/llms-add-helpers

llms: Add convenience helper for text parts

llms/generatecontent.go

@@ -82,3 +82,18 @@ type ContentChoice struct {
 	// FuncCall is non-nil when the model asks to invoke a function/tool.
 	FuncCall *schema.FunctionCall
 }
+
+// TextParts is a helper function to create a MessageContent with a role and a
+// list of text parts.
+func TextParts(role schema.ChatMessageType, parts ...string) MessageContent {
+	result := MessageContent{
+		Role:  role,
+		Parts: []ContentPart{},
+	}
+	for _, part := range parts {
+		result.Parts = append(result.Parts, TextContent{
+			Text: part,
+		})
+	}
+	return result
+}

llms/generatecontent_test.go

@@ -0,0 +1,39 @@
+package llms
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/tmc/langchaingo/schema"
+)
+
+func TestTextParts(t *testing.T) {
+	t.Parallel()
+	type args struct {
+		role  schema.ChatMessageType
+		parts []string
+	}
+	tests := []struct {
+		name string
+		args args
+		want MessageContent
+	}{
+		{"basics", args{schema.ChatMessageTypeHuman, []string{"a", "b", "c"}}, MessageContent{
+			Role: schema.ChatMessageTypeHuman,
+			Parts: []ContentPart{
+				TextContent{Text: "a"},
+				TextContent{Text: "b"},
+				TextContent{Text: "c"},
+			},
+		}},
+	}
+	for _, tt := range tests {
+		tt := tt
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+			if got := TextParts(tt.args.role, tt.args.parts...); !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("TextParts() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}