mirror of
https://github.com/42wim/matterbridge.git
synced 2024-11-24 11:42:03 -08:00
60 lines
1.5 KiB
Go
60 lines
1.5 KiB
Go
|
// Copyright 2018 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 packages
|
||
|
|
|
||
|
|
import (
|
||
|
|
"fmt"
|
||
|
|
"os"
|
||
|
|
"sort"
|
||
|
|
)
|
||
|
|
|
||
|
|
// Visit visits all the packages in the import graph whose roots are
|
||
|
|
// pkgs, calling the optional pre function the first time each package
|
||
|
|
// is encountered (preorder), and the optional post function after a
|
||
|
|
// package's dependencies have been visited (postorder).
|
||
|
|
// The boolean result of pre(pkg) determines whether
|
||
|
|
// the imports of package pkg are visited.
|
||
|
|
func Visit(pkgs []*Package, pre func(*Package) bool, post func(*Package)) {
|
||
|
|
seen := make(map[*Package]bool)
|
||
|
|
var visit func(*Package)
|
||
|
|
visit = func(pkg *Package) {
|
||
|
|
if !seen[pkg] {
|
||
|
|
seen[pkg] = true
|
||
|
|
|
||
|
|
if pre == nil || pre(pkg) {
|
||
|
|
paths := make([]string, 0, len(pkg.Imports))
|
||
|
|
for path := range pkg.Imports {
|
||
|
|
paths = append(paths, path)
|
||
|
|
}
|
||
|
|
sort.Strings(paths) // Imports is a map, this makes visit stable
|
||
|
|
for _, path := range paths {
|
||
|
|
visit(pkg.Imports[path])
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if post != nil {
|
||
|
|
post(pkg)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
for _, pkg := range pkgs {
|
||
|
|
visit(pkg)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// PrintErrors prints to os.Stderr the accumulated errors of all
|
||
|
|
// packages in the import graph rooted at pkgs, dependencies first.
|
||
|
|
// PrintErrors returns the number of errors printed.
|
||
|
|
func PrintErrors(pkgs []*Package) int {
|
||
|
|
var n int
|
||
|
|
Visit(pkgs, nil, func(pkg *Package) {
|
||
|
|
for _, err := range pkg.Errors {
|
||
|
|
fmt.Fprintln(os.Stderr, err)
|
||
|
|
n++
|
||
|
|
}
|
||
|
|
})
|
||
|
|
return n
|
||
|
|
}
|