expr.go

package main

import (
	"context"
	"io/fs"
	"os"
	"path/filepath"

	"code.dny.dev/gopherxlr/dbus"
	"code.dny.dev/gopherxlr/websocket"
	"github.com/expr-lang/expr"
	"github.com/expr-lang/expr/vm"
)

type Env struct {
	StatusChange websocket.StatusChange `expr:"status"`
	Context      context.Context        `expr:"ctx"`
}

func (Env) PlayPause(ctx context.Context, name string) error {
	return dbus.ToggleMediaPlayback(ctx, name)
}

func (Env) RunCommand(ctx context.Context, name string, args ...string) error {
	_, err := RunCommand(ctx, name, args...)
	if err != nil {
		return err
	}
	return nil
}

type Program struct {
	file string
	prog *vm.Program
}

func LoadPrograms(dir string) ([]Program, error) {
	res := []Program{}

	err := filepath.WalkDir(dir, func(path string, d fs.DirEntry, err error) error {
		if err != nil {
			return err
		}
		if !d.IsDir() {
			src, err := os.ReadFile(path)
			if err != nil {
				return err
			}
			prog, err := expr.Compile(string(src), expr.Env(Env{}), expr.WithContext("ctx"))
			if err != nil {
				return err
			}
			res = append(res, Program{file: path, prog: prog})
		}
		return nil
	})
	if err != nil {
		return nil, err
	}
	return res, nil
}