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package main
import (
"fmt"
"go/build"
"os"
goflags "github.com/jessevdk/go-flags" // rename import to `goflags` (file scope) so we can use `var flags` (package scope)
)
// flags
var flags struct {
Verbose bool `long:"verbose" short:"v" description:"Show verbose debug information"`
ImportPaths []string `long:"import-path" short:"i" description:"Import path(s) to use. Using PWD when left empty. Specify multiple times for more import paths to append"`
Append struct {
Executable string `long:"exec" description:"Executable to append" required:"true"`
} `command:"append"`
EmbedGo struct{} `command:"embed-go" alias:"embed"`
EmbedSyso struct{} `command:"embed-syso"`
Clean struct{} `command:"clean"`
}
// flags parser
var flagsParser *goflags.Parser
// initFlags parses the given flags.
// when the user asks for help (-h or --help): the application exists with status 0
// when unexpected flags is given: the application exits with status 1
func parseArguments() {
// create flags parser in global var, for flagsParser.Active.Name (operation)
flagsParser = goflags.NewParser(&flags, goflags.Default)
// parse flags
args, err := flagsParser.Parse()
if err != nil {
// assert the err to be a flags.Error
flagError := err.(*goflags.Error)
if flagError.Type == goflags.ErrHelp {
// user asked for help on flags.
// program can exit successfully
os.Exit(0)
}
if flagError.Type == goflags.ErrUnknownFlag {
fmt.Println("Use --help to view available options.")
os.Exit(1)
}
if flagError.Type == goflags.ErrRequired {
os.Exit(1)
}
fmt.Printf("Error parsing flags: %s\n", err)
os.Exit(1)
}
// error on left-over arguments
if len(args) > 0 {
fmt.Printf("Unexpected arguments: %s\nUse --help to view available options.", args)
os.Exit(1)
}
// default ImportPath to pwd when not set
if len(flags.ImportPaths) == 0 {
pwd, err := os.Getwd()
if err != nil {
fmt.Printf("error getting pwd: %s\n", err)
os.Exit(1)
}
verbosef("using pwd as import path\n")
// find non-absolute path for this pwd
pkg, err := build.ImportDir(pwd, build.FindOnly)
if err != nil {
fmt.Printf("error using current directory as import path: %s\n", err)
os.Exit(1)
}
flags.ImportPaths = append(flags.ImportPaths, pkg.ImportPath)
verbosef("using import paths: %s\n", flags.ImportPaths)
return
}
}
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