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