435c0d9fc8
This PR switches the Nomad repository from using govendor to Go modules for managing dependencies. Aspects of the Nomad workflow remain pretty much the same. The usual Makefile targets should continue to work as they always did. The API submodule simply defers to the parent Nomad version on the repository, keeping the semantics of API versioning that currently exists.
56 lines
1.3 KiB
Go
56 lines
1.3 KiB
Go
package packages
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import (
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"fmt"
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"os"
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"sort"
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)
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// Visit visits all the packages in the import graph whose roots are
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// pkgs, calling the optional pre function the first time each package
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// is encountered (preorder), and the optional post function after a
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// package's dependencies have been visited (postorder).
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// The boolean result of pre(pkg) determines whether
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// the imports of package pkg are visited.
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func Visit(pkgs []*Package, pre func(*Package) bool, post func(*Package)) {
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seen := make(map[*Package]bool)
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var visit func(*Package)
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visit = func(pkg *Package) {
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if !seen[pkg] {
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seen[pkg] = true
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if pre == nil || pre(pkg) {
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paths := make([]string, 0, len(pkg.Imports))
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for path := range pkg.Imports {
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paths = append(paths, path)
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}
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sort.Strings(paths) // Imports is a map, this makes visit stable
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for _, path := range paths {
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visit(pkg.Imports[path])
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}
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}
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if post != nil {
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post(pkg)
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}
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}
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}
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for _, pkg := range pkgs {
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visit(pkg)
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}
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}
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// PrintErrors prints to os.Stderr the accumulated errors of all
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// packages in the import graph rooted at pkgs, dependencies first.
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// PrintErrors returns the number of errors printed.
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func PrintErrors(pkgs []*Package) int {
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var n int
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Visit(pkgs, nil, func(pkg *Package) {
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for _, err := range pkg.Errors {
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fmt.Fprintln(os.Stderr, err)
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n++
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}
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})
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return n
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}
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