vlp/internal/state/builtins.go

package state

import (
	"code.vulpine.solutions/sam/vlp/internal/build"
	"code.vulpine.solutions/sam/vlp/internal/packages"
	lua "github.com/yuin/gopher-lua"
)

func (s *State) depends(ls *lua.LState) int {
	t := ls.GetTop()
	if t == 0 {
		return 0
	}

	for i := 1; i <= t; i++ {
		table, ok := ls.Get(i).(*lua.LTable)
		if !ok {
			ls.RaiseError("Argument %v was not a table", i)
			return 0
		}

		var (
			name    string
			version = "*"
		)

		switch table.Len() {
		default:
			fallthrough
		case 2:
			version = table.RawGetInt(2).String()
			fallthrough
		case 1:
			name = table.RawGetInt(1).String()
		case 0:
			ls.RaiseError("Table %v is empty", i)
			return 0
		}

		s.Builder.Dependencies = append(s.Builder.Dependencies, packages.Dependency{Name: name, Version: version})
	}

	return 0
}

func (s *State) git(ls *lua.LState) int {
	t := ls.GetTop()
	if t == 0 {
		ls.RaiseError("`git` needs a repository URL")
		return 0
	}

	var repo, ref string

	lrepo, ok := ls.Get(1).(lua.LString)
	if !ok {
		ls.RaiseError("Argument 1 is not a string")
		return 0
	}
	repo = lrepo.String()

	lref, ok := ls.Get(2).(lua.LString)
	if ok {
		ref = lref.String()
	}

	s.Builder.SourceFetcher = build.GitFetcher{Repository: repo, Ref: ref}
	return 0
}

func (s *State) cmd(ls *lua.LState) int {
	t := ls.GetTop()
	if t == 0 {
		ls.RaiseError("`cmd` needs a command to run")
		return 0
	}

	lcmd, ok := ls.Get(1).(lua.LString)
	if !ok {
		ls.RaiseError("Argument 1 is not a string")
		return 0
	}

	var args []string
	for i := 2; i <= t; i++ {
		larg := ls.Get(i)
		if larg == lua.LNil {
			break
		}
		args = append(args, larg.String())
	}

	s.Builder.Commands = append(s.Builder.Commands, build.BuildCommand{Command: lcmd.String(), Args: args})
	return 0
}

func (s *State) bin(ls *lua.LState) int {
	if ls.GetTop() != 1 {
		ls.RaiseError("`bin` needs a single binary to install")
		return 0
	}

	lbin, ok := ls.Get(1).(lua.LString)
	if !ok {
		ls.RaiseError("Argument 1 is not a string")
		return 0
	}

	s.Builder.Binaries = append(s.Builder.Binaries, lbin.String())
	return 0
}