github.com/mem/u-root@v2.0.1-0.20181004165302-9b18b4636a33+incompatible/cmds/elvish/program/subprograms.go (about)

     1  package program
     2  
     3  import (
     4  	"fmt"
     5  	"os"
     6  
     7  	"github.com/u-root/u-root/cmds/elvish/build"
     8  )
     9  
    10  // ShowHelp shows help message.
    11  type ShowHelp struct {
    12  	flag *flagSet
    13  }
    14  
    15  func (s ShowHelp) Main([]string) int {
    16  	usage(os.Stdout, s.flag)
    17  	return 0
    18  }
    19  
    20  type ShowCorrectUsage struct {
    21  	message string
    22  	flag    *flagSet
    23  }
    24  
    25  func (s ShowCorrectUsage) Main([]string) int {
    26  	usage(os.Stderr, s.flag)
    27  	return 2
    28  }
    29  
    30  // ShowVersion shows the version.
    31  type ShowVersion struct{}
    32  
    33  func (ShowVersion) Main([]string) int {
    34  	fmt.Println(build.Version)
    35  	fmt.Fprintln(os.Stderr, "-version is deprecated and will be removed in 0.12. Use -buildinfo instead.")
    36  	return 0
    37  }
    38  
    39  // ShowBuildInfo shows build information.
    40  type ShowBuildInfo struct {
    41  	JSON bool
    42  }
    43  
    44  func (info ShowBuildInfo) Main([]string) int {
    45  	if info.JSON {
    46  		fmt.Printf("{version: %s, builder: %s}\n",
    47  			quoteJSON(build.Version), quoteJSON(build.Builder))
    48  	} else {
    49  		fmt.Println("version:", build.Version)
    50  		fmt.Println("builder:", build.Builder)
    51  	}
    52  	return 0
    53  }