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/cmd.go

@@ -0,0 +1,93 @@
+package cmd
+
+import (
+	"strings"
+
+	"git.mlow.ca/mlow/lmcli/pkg/lmcli"
+	"git.mlow.ca/mlow/lmcli/pkg/util"
+	"github.com/spf13/cobra"
+)
+
+var (
+	systemPromptFile string
+)
+
+func RootCmd(ctx *lmcli.Context) *cobra.Command {
+	var root = &cobra.Command{
+		Use:           "lmcli <command> [flags]",
+		Long:          `lmcli - Large Language Model CLI`,
+		SilenceErrors: true,
+		SilenceUsage:  true,
+		Run: func(cmd *cobra.Command, args []string) {
+			cmd.Usage()
+		},
+	}
+
+	continueCmd := ContinueCmd(ctx)
+	cloneCmd := CloneCmd(ctx)
+	editCmd := EditCmd(ctx)
+	listCmd := ListCmd(ctx)
+	newCmd := NewCmd(ctx)
+	promptCmd := PromptCmd(ctx)
+	renameCmd := RenameCmd(ctx)
+	replyCmd := ReplyCmd(ctx)
+	retryCmd := RetryCmd(ctx)
+	rmCmd := RemoveCmd(ctx)
+	viewCmd := ViewCmd(ctx)
+
+	inputCmds := []*cobra.Command{newCmd, promptCmd, replyCmd, retryCmd, continueCmd, editCmd}
+	for _, cmd := range inputCmds {
+		cmd.Flags().StringVar(ctx.Config.Defaults.Model, "model", *ctx.Config.Defaults.Model, "Which model to use")
+		cmd.Flags().IntVar(ctx.Config.Defaults.MaxTokens, "length", *ctx.Config.Defaults.MaxTokens, "Maximum response tokens")
+		cmd.Flags().StringVar(ctx.Config.Defaults.SystemPrompt, "system-prompt", *ctx.Config.Defaults.SystemPrompt, "System prompt")
+		cmd.Flags().StringVar(&systemPromptFile, "system-prompt-file", "", "A path to a file containing the system prompt")
+		cmd.MarkFlagsMutuallyExclusive("system-prompt", "system-prompt-file")
+	}
+
+	renameCmd.Flags().Bool("generate", false, "Generate a conversation title")
+
+	root.AddCommand(
+		cloneCmd,
+		continueCmd,
+		editCmd,
+		listCmd,
+		newCmd,
+		promptCmd,
+		renameCmd,
+		replyCmd,
+		retryCmd,
+		rmCmd,
+		viewCmd,
+	)
+
+	return root
+}
+
+func getSystemPrompt(ctx *lmcli.Context) string {
+	if systemPromptFile != "" {
+		content, err := util.ReadFileContents(systemPromptFile)
+		if err != nil {
+			lmcli.Fatal("Could not read file contents at %s: %v\n", systemPromptFile, err)
+		}
+		return content
+	}
+	return *ctx.Config.Defaults.SystemPrompt
+}
+
+// inputFromArgsOrEditor returns either the provided input from the args slice
+// (joined with spaces), or if len(args) is 0, opens an editor and returns
+// whatever input was provided there. placeholder is a string which populates
+// the editor and gets stripped from the final output.
+func inputFromArgsOrEditor(args []string, placeholder string, existingMessage string) (message string) {
+	var err error
+	if len(args) == 0 {
+		message, err = util.InputFromEditor(placeholder, "message.*.md", existingMessage)
+		if err != nil {
+			lmcli.Fatal("Failed to get input: %v\n", err)
+		}
+	} else {
+		message = strings.Join(args, " ")
+	}
+	message = strings.Trim(message, " \t\n")
+	return
+}