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// Copyright 2015 The appc Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package main
import (
"flag"
"fmt"
"os"
"strings"
"text/tabwriter"
)
const (
cliName = "actool"
cliDescription = "actool, the application container tool"
)
var (
globalFlagset = flag.NewFlagSet(cliName, flag.ExitOnError)
out *tabwriter.Writer
commands []*Command
globalFlags = struct {
Dir string
Debug bool
Help bool
}{}
transportFlags = struct {
Insecure bool
}{}
)
func init() {
globalFlagset.BoolVar(&globalFlags.Help, "help", false, "Print usage information and exit")
globalFlagset.BoolVar(&globalFlags.Debug, "debug", false, "Print verbose (debug) output")
}
type Command struct {
Name string // Name of the Command and the string to use to invoke it
Summary string // One-sentence summary of what the Command does
Usage string // Usage options/arguments
Description string // Detailed description of command
Flags flag.FlagSet // Set of flags associated with this command
Run func(args []string) int // Run a command with the given arguments, return exit status
}
func init() {
out = new(tabwriter.Writer)
out.Init(os.Stdout, 0, 8, 1, '\t', 0)
commands = []*Command{
cmdBuild,
cmdCatManifest,
cmdDiscover,
cmdHelp,
cmdPatchManifest,
cmdValidate,
cmdVersion,
}
}
func main() {
// parse global arguments
globalFlagset.Parse(os.Args[1:])
args := globalFlagset.Args()
if len(args) < 1 || globalFlags.Help {
args = []string{"help"}
}
var cmd *Command
// determine which Command should be run
for _, c := range commands {
if c.Name == args[0] {
cmd = c
if err := c.Flags.Parse(args[1:]); err != nil {
stderr("%v", err)
os.Exit(2)
}
break
}
}
if cmd == nil {
stderr("%v: unknown subcommand: %q", cliName, args[0])
stderr("Run '%v help' for usage.", cliName)
os.Exit(2)
}
os.Exit(cmd.Run(cmd.Flags.Args()))
}
func getAllFlags() (flags []*flag.Flag) {
return getFlags(globalFlagset)
}
func getFlags(flagset *flag.FlagSet) (flags []*flag.Flag) {
flags = make([]*flag.Flag, 0)
flagset.VisitAll(func(f *flag.Flag) {
flags = append(flags, f)
})
return
}
func stderr(format string, a ...interface{}) {
out := fmt.Sprintf(format, a...)
fmt.Fprintln(os.Stderr, strings.TrimSuffix(out, "\n"))
}
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