github.com/comcast/canticle@v0.0.0-20161108184242-c53cface56e8/cant/cant.go (about)

     1  package main
     2  
     3  import (
     4  	"encoding/json"
     5  	"flag"
     6  	"fmt"
     7  	"log"
     8  	"os"
     9  	"text/template"
    10  
    11  	"github.com/Comcast/Canticle/buildinfo"
    12  	"github.com/Comcast/Canticle/canticles"
    13  )
    14  
    15  // Canticle will:
    16  // Load deps files
    17  // Make the working dir _workspace
    18  // Grab the deps listed in the file (all deps must be listed), it may grab from an alternative url
    19  // Import the deps
    20  // No rewrite necessary..., just overload gopath
    21  // Copy your current _workspace into in the correct place
    22  // Call build/test/whatever
    23  // Copy the result back out
    24  func main() {
    25  	versionFlag := flag.Bool("version", false, "version prints the version info of canticle")
    26  	flag.Usage = usage
    27  	flag.Parse()
    28  	log.SetFlags(0)
    29  
    30  	if *versionFlag {
    31  		b, err := json.MarshalIndent(buildinfo.GetBuildInfo(), "", "    ")
    32  		if err != nil {
    33  			log.Fatalf("Error marshaling own buildinfo!: %s", err.Error())
    34  		}
    35  		log.Printf("BuildInfo: \n%s\n", string(b))
    36  		return
    37  	}
    38  
    39  	args := flag.Args()
    40  	if len(args) < 1 {
    41  		usage()
    42  	}
    43  
    44  	cmdName := args[0]
    45  	cmd, ok := canticles.Commands[cmdName]
    46  	if !ok {
    47  		fmt.Fprintln(os.Stderr, "Unkown subcommand ", cmdName)
    48  		usage()
    49  	}
    50  
    51  	cmd.Flags.Usage = cmd.Usage
    52  	cmd.Flags.Parse(args[1:])
    53  	cmd.Cmd.Run(args[1:])
    54  }
    55  
    56  var UsageTemplate = `Canticle is a tool for managing go dependencies.
    57  
    58  Usage:
    59    cant command [arguments]
    60  
    61  The commands are:
    62  {{range .}}
    63           {{.Name | printf "%-11s"}} {{.ShortDescription}}{{end}}
    64  
    65  Use "cant help [command]" for more information about that command.
    66  `
    67  
    68  func usage() {
    69  	tmpl, _ := template.New("UsageTemplate").Parse(UsageTemplate)
    70  	tmpl.Execute(os.Stderr, canticles.Commands)
    71  	os.Exit(2)
    72  }