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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
import (
"bufio"
"encoding/json"
"io"
"os"
"strings"
"text/template"
)
var cmdList = &Command{
UsageLine: "list [-e] [-f format] [-json] [-tags 'tag list'] [packages]",
Short: "list packages",
Long: `
List lists the packages named by the import paths, one per line.
The default output shows the package import path:
code.google.com/p/google-api-go-client/books/v1
code.google.com/p/goauth2/oauth
code.google.com/p/sqlite
The -f flag specifies an alternate format for the list, using the
syntax of package template. The default output is equivalent to -f
'{{.ImportPath}}'. One extra template function is available, "join",
which calls strings.Join. The struct being passed to the template is:
type Package struct {
Dir string // directory containing package sources
ImportPath string // import path of package in dir
Name string // package name
Doc string // package documentation string
Target string // install path
Goroot bool // is this package in the Go root?
Standard bool // is this package part of the standard Go library?
Stale bool // would 'go install' do anything for this package?
Root string // Go root or Go path dir containing this package
// Source files
GoFiles []string // .go source files (excluding CgoFiles, TestGoFiles, XTestGoFiles)
CgoFiles []string // .go sources files that import "C"
IgnoredGoFiles []string // .go sources ignored due to build constraints
CFiles []string // .c source files
HFiles []string // .h source files
SFiles []string // .s source files
SysoFiles []string // .syso object files to add to archive
SwigFiles []string // .swig files
SwigCXXFiles []string // .swigcxx files
// Cgo directives
CgoCFLAGS []string // cgo: flags for C compiler
CgoLDFLAGS []string // cgo: flags for linker
CgoPkgConfig []string // cgo: pkg-config names
// Dependency information
Imports []string // import paths used by this package
Deps []string // all (recursively) imported dependencies
// Error information
Incomplete bool // this package or a dependency has an error
Error *PackageError // error loading package
DepsErrors []*PackageError // errors loading dependencies
TestGoFiles []string // _test.go files in package
TestImports []string // imports from TestGoFiles
XTestGoFiles []string // _test.go files outside package
XTestImports []string // imports from XTestGoFiles
}
The -json flag causes the package data to be printed in JSON format
instead of using the template format.
The -e flag changes the handling of erroneous packages, those that
cannot be found or are malformed. By default, the list command
prints an error to standard error for each erroneous package and
omits the packages from consideration during the usual printing.
With the -e flag, the list command never prints errors to standard
error and instead processes the erroneous packages with the usual
printing. Erroneous packages will have a non-empty ImportPath and
a non-nil Error field; other information may or may not be missing
(zeroed).
The -tags flag specifies a list of build tags, like in the 'go build'
command.
For more about specifying packages, see 'go help packages'.
`,
}
func init() {
cmdList.Run = runList // break init cycle
cmdList.Flag.Var(buildCompiler{}, "compiler", "")
cmdList.Flag.Var((*stringsFlag)(&buildContext.BuildTags), "tags", "")
}
var listE = cmdList.Flag.Bool("e", false, "")
var listFmt = cmdList.Flag.String("f", "{{.ImportPath}}", "")
var listJson = cmdList.Flag.Bool("json", false, "")
var nl = []byte{'\n'}
func runList(cmd *Command, args []string) {
out := newTrackingWriter(os.Stdout)
defer out.w.Flush()
var do func(*Package)
if *listJson {
do = func(p *Package) {
b, err := json.MarshalIndent(p, "", "\t")
if err != nil {
out.Flush()
fatalf("%s", err)
}
out.Write(b)
out.Write(nl)
}
} else {
tmpl, err := template.New("main").Funcs(template.FuncMap{"join": strings.Join}).Parse(*listFmt)
if err != nil {
fatalf("%s", err)
}
do = func(p *Package) {
if err := tmpl.Execute(out, p); err != nil {
out.Flush()
fatalf("%s", err)
}
if out.NeedNL() {
out.Write([]byte{'\n'})
}
}
}
load := packages
if *listE {
load = packagesAndErrors
}
for _, pkg := range load(args) {
do(pkg)
}
}
// TrackingWriter tracks the last byte written on every write so
// we can avoid printing a newline if one was already written or
// if there is no output at all.
type TrackingWriter struct {
w *bufio.Writer
last byte
}
func newTrackingWriter(w io.Writer) *TrackingWriter {
return &TrackingWriter{
w: bufio.NewWriter(w),
last: '\n',
}
}
func (t *TrackingWriter) Write(p []byte) (n int, err error) {
n, err = t.w.Write(p)
if n > 0 {
t.last = p[n-1]
}
return
}
func (t *TrackingWriter) Flush() {
t.w.Flush()
}
func (t *TrackingWriter) NeedNL() bool {
return t.last != '\n'
}
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