Project refactor, add anthropic API support

- Split pkg/cli/cmd.go into new pkg/cmd package
- Split pkg/cli/functions.go into pkg/lmcli/tools package
- Refactor pkg/cli/openai.go to pkg/lmcli/provider/openai

Other changes:

- Made models configurable
- Slight config reorganization

pkg/cmd/rename.go

@@ -0,0 +1,60 @@
+package cmd
+
+import (
+	"fmt"
+	"strings"
+
+	"git.mlow.ca/mlow/lmcli/pkg/lmcli"
+	"github.com/spf13/cobra"
+	cmdutil "git.mlow.ca/mlow/lmcli/pkg/cmd/util"
+)
+
+func RenameCmd(ctx *lmcli.Context) *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "rename <conversation> [title]",
+		Short: "Rename a conversation",
+		Long:  `Renames a conversation, either with the provided title or by generating a new name.`,
+		Args: func(cmd *cobra.Command, args []string) error {
+			argCount := 1
+			if err := cobra.MinimumNArgs(argCount)(cmd, args); err != nil {
+				return err
+			}
+			return nil
+		},
+		RunE: func(cmd *cobra.Command, args []string) error {
+			shortName := args[0]
+			conversation := cmdutil.LookupConversation(ctx, shortName)
+			var err error
+
+			generate, _ := cmd.Flags().GetBool("generate")
+			var title string
+			if generate {
+				title, err = cmdutil.GenerateTitle(ctx, conversation)
+				if err != nil {
+					return fmt.Errorf("Could not generate conversation title: %v", err)
+				}
+			} else {
+				if len(args) < 2 {
+					return fmt.Errorf("Conversation title not provided.")
+				}
+				title = strings.Join(args[1:], " ")
+			}
+
+			conversation.Title = title
+			err = ctx.Store.SaveConversation(conversation)
+			if err != nil {
+				lmcli.Warn("Could not save conversation with new title: %v\n", err)
+			}
+			return nil
+		},
+		ValidArgsFunction: func(cmd *cobra.Command, args []string, toComplete string) ([]string, cobra.ShellCompDirective) {
+			compMode := cobra.ShellCompDirectiveNoFileComp
+			if len(args) != 0 {
+				return nil, compMode
+			}
+			return ctx.Store.ConversationShortNameCompletions(toComplete), compMode
+		},
+	}
+
+	return cmd
+}