library_cli.go

package main

import (
	"fmt"
	"io"
	"os"
	"strings"

	"github.com/yetone/magpie/internal/library"
)

const libraryUsage = `magpie library                     what the library gives each agent: instructions, MCP servers, skills
  magpie library sync                write it into the agents again (after one is installed, or edited by hand)
  magpie library instructions        print the shared instructions
  magpie library instructions set <file|->   replace them with a file's text (- for stdin)
  magpie library instructions agents <a,b…|none>   the agents that get them
  magpie library mcp add <name> <url | command args…> [agents=a,b…]
  magpie library mcp agents <name> <a,b…|none>
  magpie library mcp rm <name>
  magpie library skill agents <name> <a,b…|none>
  magpie library skill rm <name>     (skills are installed from the app's Library page)
`

// libraryCmd is magpie library …: the instructions, MCP servers and skills
// magpie keeps once and writes into every agent.
func libraryCmd(args []string) error {
	if len(args) < 2 {
		return libraryStatus()
	}
	var (
		res *library.Result
		err error
	)
	switch sub, rest := args[1], args[2:]; sub {
	case "sync":
		res, err = library.Sync()
	case "instructions":
		if len(rest) == 0 {
			v, err := library.ReadInstructions()
			if err != nil {
				return err
			}
			fmt.Print(v.Shared)
			if v.Shared != "" && !strings.HasSuffix(v.Shared, "\n") {
				fmt.Println()
			}
			return nil
		}
		switch {
		case rest[0] == "set" && len(rest) == 2:
			var b []byte
			if rest[1] == "-" {
				b, err = io.ReadAll(os.Stdin)
			} else {
				b, err = os.ReadFile(rest[1])
			}
			if err != nil {
				return err
			}
			text := string(b)
			res, err = library.SaveInstructions(library.InstructionsChange{Shared: &text})
		case rest[0] == "agents" && len(rest) == 2:
			var as []string
			if as, err = libraryAgents(rest[1], "instructions"); err == nil {
				res, err = library.SaveInstructions(library.InstructionsChange{Agents: as})
			}
		default:
			return fmt.Errorf("usage:\n  %s", libraryUsage)
		}
	case "mcp":
		switch {
		case len(rest) >= 3 && rest[0] == "add":
			s := library.Server{Name: rest[1], Agents: []string{}}
			var cmd []string
			for _, a := range rest[2:] {
				if v, ok := strings.CutPrefix(a, "agents="); ok {
					if s.Agents, err = libraryAgents(v, "mcp"); err != nil {
						return err
					}
				} else {
					cmd = append(cmd, a)
				}
			}
			switch {
			case len(cmd) == 0:
				return fmt.Errorf("a URL or a command is needed")
			case strings.HasPrefix(cmd[0], "http://") || strings.HasPrefix(cmd[0], "https://"):
				s.Transport, s.URL = "http", cmd[0]
				if len(cmd) > 1 {
					return fmt.Errorf("a server by URL takes nothing after it")
				}
			default:
				s.Transport, s.Command, s.Args = "stdio", cmd[0], cmd[1:]
			}
			res, err = library.SaveServer("", s)
		case len(rest) == 3 && rest[0] == "agents":
			var as []string
			if as, err = libraryAgents(rest[2], "mcp"); err == nil {
				res, err = library.ServerAgents(rest[1], as)
			}
		case len(rest) == 2 && rest[0] == "rm":
			res, err = library.RemoveServer(rest[1])
		default:
			return fmt.Errorf("usage:\n  %s", libraryUsage)
		}
	case "skill", "skills":
		switch {
		case len(rest) == 3 && rest[0] == "agents":
			var as []string
			if as, err = libraryAgents(rest[2], "skills"); err == nil {
				res, err = library.SkillAgents(rest[1], as)
			}
		case len(rest) == 2 && rest[0] == "rm":
			res, err = library.RemoveSkill(rest[1])
		default:
			return fmt.Errorf("usage:\n  %s", libraryUsage)
		}
	case "help", "-h", "--help":
		fmt.Print("  " + libraryUsage)
		return nil
	default:
		return fmt.Errorf("no library command %q\n  %s", sub, libraryUsage)
	}
	if err != nil {
		return err
	}
	printLibraryResult(res)
	return nil
}

// agentList is a comma list of agents; none (or nothing) is no agent.
func agentList(s string) []string {
	out := []string{}
	for _, a := range strings.Split(s, ",") {
		if a = strings.TrimSpace(a); a != "" && a != "none" {
			out = append(out, a)
		}
	}
	return out
}

// libraryAgents is agentList with each agent's id, refused when the library
// has no place in it for kind.
func libraryAgents(s, kind string) ([]string, error) {
	out := []string{}
	for _, a := range agentList(s) {
		id, err := library.Takes(a, kind)
		if err != nil {
			return nil, err
		}
		out = append(out, id)
	}
	return out, nil
}

func printLibraryResult(res *library.Result) {
	if len(res.Changed) == 0 {
		fmt.Println(green.Render("✓"), "every agent already has it")
	} else {
		fmt.Println(green.Render("✓"), "written into", strings.Join(res.Changed, ", "))
	}
	for _, p := range res.Problems {
		fmt.Println(amber.Render("!"), p.Agent, muted.Render(p.What+":"), p.Error)
	}
	for _, m := range res.Missing {
		fmt.Println(amber.Render("!"), "the library no longer has", m)
	}
	if res.Backup != "" {
		fmt.Println(muted.Render("  what was there before is kept in " + res.Backup))
	}
}

func libraryStatus() error {
	v, err := library.Read(nil)
	if err != nil {
		return err
	}
	on := func(ids []string) string {
		if len(ids) == 0 {
			return muted.Render("no agent")
		}
		return strings.Join(ids, ", ")
	}
	fmt.Println(bold.Render("Instructions"))
	var to []string
	for _, a := range v.Instructions.Agents {
		if a.On {
			to = append(to, a.Agent)
		}
	}
	if strings.TrimSpace(v.Instructions.Shared) == "" {
		fmt.Println(" ", muted.Render("none yet · magpie library instructions set <file>"))
	} else {
		fmt.Printf("  %d lines → %s\n", strings.Count(strings.TrimRight(v.Instructions.Shared, "\n"), "\n")+1, on(to))
	}
	for _, a := range v.Instructions.Agents {
		if a.Edited {
			fmt.Println(" ", amber.Render("!"), a.Agent, muted.Render("magpie's part was edited in "+a.Path))
		}
	}
	fmt.Println(bold.Render("MCP servers"))
	if len(v.Servers) == 0 {
		fmt.Println(" ", muted.Render("none yet"))
	}
	for _, s := range v.Servers {
		what := s.URL
		if s.Command != "" {
			what = strings.TrimSpace(s.Command + " " + strings.Join(s.Args, " "))
		}
		fmt.Printf("  %s %s → %s\n", bold.Render(s.Name), muted.Render(what), on(s.Agents))
		for a, e := range s.Problems {
			fmt.Println("   ", amber.Render("!"), a, muted.Render(e))
		}
	}
	var found, own []string
	for _, f := range v.FoundServers {
		if f.Own {
			own = append(own, f.Server.Name+muted.Render(" ("+strings.Join(f.Server.Agents, ", ")+"'s own)"))
		} else {
			found = append(found, f.Server.Name+muted.Render(" ("+strings.Join(f.Server.Agents, ", ")+")"))
		}
	}
	if len(found) > 0 {
		fmt.Println(" ", muted.Render("in your agents, not in the library:"), strings.Join(found, ", "))
	}
	if len(own) > 0 {
		fmt.Println(" ", muted.Render("added by the agent itself, left as they are:"), strings.Join(own, ", "))
	}
	fmt.Println(bold.Render("Skills"))
	if len(v.Skills) == 0 {
		fmt.Println(" ", muted.Render("none yet"))
	}
	for _, s := range v.Skills {
		fmt.Printf("  %s → %s\n", bold.Render(s.Name), on(s.Agents))
		if s.Missing {
			fmt.Println("   ", amber.Render("!"), muted.Render("its folder is gone"))
		}
	}
	fmt.Println(muted.Render("  kept in " + v.Dir + " · magpie library help"))
	return nil
}