github.com/hwaf/hwaf@v0.0.0-20140814122253-5465f73b20f1/cmd_dump_env.go (about)

     1  package main
     2  
     3  import (
     4  	"bytes"
     5  	"encoding/json"
     6  	"fmt"
     7  	"os"
     8  	"os/exec"
     9  	// "path/filepath"
    10  
    11  	"github.com/gonuts/commander"
    12  	"github.com/gonuts/flag"
    13  )
    14  
    15  func hwaf_make_cmd_dump_env() *commander.Command {
    16  	cmd := &commander.Command{
    17  		Run:       hwaf_run_cmd_dump_env,
    18  		UsageLine: "dump-env [options]",
    19  		Short:     "print the environment on STDOUT",
    20  		Long: `
    21  dump-env prints the environment on STDOUT.
    22  
    23  ex:
    24   $ hwaf dump-env
    25   $ hwaf dump-env -shell=sh
    26   $ hwaf dump-env -shell=csh
    27  `,
    28  		Flag: *flag.NewFlagSet("hwaf-dump-env", flag.ExitOnError),
    29  		//CustomFlags: true,
    30  	}
    31  	cmd.Flag.Bool("v", false, "enable verbose output")
    32  	cmd.Flag.String("shell", "", "type of shell to print the environment for (default=sh)")
    33  	return cmd
    34  }
    35  
    36  func hwaf_run_cmd_dump_env(cmd *commander.Command, args []string) error {
    37  	var err error
    38  	n := "hwaf-" + cmd.Name()
    39  
    40  	switch len(args) {
    41  	case 0:
    42  		// ok
    43  	default:
    44  		return fmt.Errorf("%s: does not take any argument\n", n)
    45  	}
    46  
    47  	var export_var func(k string) string
    48  	shell := cmd.Flag.Lookup("shell").Value.Get().(string)
    49  	//verbose := cmd.Flag.Lookup("v").Value.Get().(bool)
    50  
    51  	if shell == "" {
    52  		shell = "sh"
    53  	}
    54  
    55  	switch shell {
    56  	default:
    57  		return fmt.Errorf("%s: shell of type [%s] is unknown", n, shell)
    58  
    59  	case "sh":
    60  		export_var = func(k string) string { return fmt.Sprintf("export %s=", k) }
    61  
    62  	case "csh":
    63  		export_var = func(k string) string { return fmt.Sprintf("setenv %s ", k) }
    64  	}
    65  
    66  	if export_var == nil {
    67  		err = fmt.Errorf("%s: could find a suitable shell", n)
    68  	}
    69  
    70  	bin, err := exec.LookPath(os.Args[0])
    71  	if err != nil {
    72  		return err
    73  	}
    74  
    75  	buf := new(bytes.Buffer)
    76  	waf := exec.Command(
    77  		bin, "waf", "dump-env",
    78  	)
    79  	waf.Stdin = os.Stdin
    80  	waf.Stdout = buf
    81  	waf.Stderr = os.Stderr
    82  
    83  	err = waf.Run()
    84  	if err != nil {
    85  		return err
    86  	}
    87  
    88  	env := make(map[string]string)
    89  	err = json.Unmarshal(buf.Bytes(), &env)
    90  	if err != nil {
    91  		return err
    92  	}
    93  
    94  	//fmt.Printf("%v\n", env)
    95  	for k, v := range env {
    96  		if k == "_" || k == "PS1" {
    97  			continue
    98  		}
    99  		fmt.Printf("%s%q\n", export_var(k), v)
   100  	}
   101  
   102  	return nil
   103  }
   104  
   105  // EOF