cmd_lex.go

//
// Invoke our lexer on the specified input-file(s) and dump the output.
//

package main

import (
	"context"
	"flag"
	"fmt"
	"io/ioutil"

	"github.com/google/subcommands"
	"github.com/skx/deployr/lexer"
	"github.com/skx/deployr/util"
)

//
// lexCmd is the structure for this sub-command.
//
type lexCmd struct {
}

//
// Glue
//
func (*lexCmd) Name() string     { return "lex" }
func (*lexCmd) Synopsis() string { return "Show our lexer output." }
func (*lexCmd) Usage() string {
	return `lex :
  Show the output of running our lexer on the given file(s).
`
}

//
// Flag setup
//
func (p *lexCmd) SetFlags(f *flag.FlagSet) {
}

//
// Lex the given recipe
//
func (p *lexCmd) Lex(file string) {

	//
	// Read the file contents.
	//
	dat, err := ioutil.ReadFile(file)
	if err != nil {
		fmt.Printf("Error reading file %s - %s\n", file, err.Error())
		return
	}

	//
	// Create a lexer object with those contents.
	//
	l := lexer.New(string(dat))

	//
	// Dump the tokens.
	//
	l.Dump()
}

//
// Entry-point.
//
func (p *lexCmd) Execute(_ context.Context, f *flag.FlagSet, _ ...interface{}) subcommands.ExitStatus {

	//
	// For each file we've been passed.
	//
	for _, file := range f.Args() {
		p.Lex(file)
	}

	//
	// Fallback.
	//
	if len(f.Args()) < 1 {
		if util.FileExists("deploy.recipe") {
			p.Lex("deploy.recipe")
		}
	}

	return subcommands.ExitSuccess
}