example_test.go

Documentation: golang.org/x/tools/go/packages

     1  // Copyright 2018 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  package packages_test
     6  
     7  import (
     8  	"flag"
     9  	"fmt"
    10  	"os"
    11  
    12  	"golang.org/x/tools/go/packages"
    13  )
    14  
    15  // Example demonstrates how to load the packages specified on the
    16  // command line from source syntax.
    17  func Example() {
    18  	flag.Parse()
    19  
    20  	// Many tools pass their command-line arguments (after any flags)
    21  	// uninterpreted to packages.Load so that it can interpret them
    22  	// according to the conventions of the underlying build system.
    23  	cfg := &packages.Config{Mode: packages.NeedFiles | packages.NeedSyntax}
    24  	pkgs, err := packages.Load(cfg, flag.Args()...)
    25  	if err != nil {
    26  		fmt.Fprintf(os.Stderr, "load: %v\n", err)
    27  		os.Exit(1)
    28  	}
    29  	if packages.PrintErrors(pkgs) > 0 {
    30  		os.Exit(1)
    31  	}
    32  
    33  	// Print the names of the source files
    34  	// for each package listed on the command line.
    35  	for _, pkg := range pkgs {
    36  		fmt.Println(pkg.ID, pkg.GoFiles)
    37  	}
    38  }
    39
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