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main.go
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main.go
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/*
* Copyright (c) 2013 Dario Castañé.
* This file is part of Zas.
*
* Zas is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Zas is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with Zas. If not, see <http://www.gnu.org/licenses/>.
*/
package main
import (
"flag"
"fmt"
"os"
"os/exec"
"runtime"
"strings"
)
/*
* Zas internal subcommand.
*
* Inspired by go command.
*/
type Subcommand struct {
// Runs the subcommand
// The args are the arguments after the subcommand name.
Run func()
// UsageLine is the one-line usage message.
// The first word in the line is taken to be the subcommand name
// with Init() function.
UsageLine string
// Name is the name of the subcommand.
Name string
// Flag is a set of flags specific to this command.
Flag flag.FlagSet
}
/*
* Subcommand init function.
*/
func (c *Subcommand) Init() {
data := strings.SplitN(c.UsageLine, " ", 2)
c.Name = strings.ToLower(data[0])
}
/*
* Current Zas internal subcommands.
*/
var subcommands = []*Subcommand{
cmdInit,
cmdGenerate,
}
func main() {
flag.Parse()
args := flag.Args()
if len(args) > 0 {
args[0] = strings.ToLower(args[0])
} else {
// If no subcommand is provided, we default to "generate".
args = []string{"generate"}
}
runtime.GOMAXPROCS(runtime.NumCPU())
found := false
for _, cmd := range subcommands {
if cmd.Name == args[0] && cmd.Run != nil {
found = true
cmd.Flag.Parse(args[1:])
cmd.Run()
break
}
}
if !found {
// If not internal subcommand is found, we try to exec an external Zas subcommand (plugin).
cmd := exec.Command(fmt.Sprintf("%s%s", ZAS_PREFIX, args[0]), args[1:]...)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
if err := cmd.Run(); err != nil {
fmt.Fprintf(os.Stderr, "# %s %s\n", args[0], strings.Join(args[1:], " "))
panic(err)
}
}
}