/
main.go
144 lines (129 loc) · 2.4 KB
/
main.go
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// Graphpkg produces an svg graph of the dependency tree of a package
//
// Requires
// - dot (graphviz)
//
// Usage
//
// graphpkg path/to/your/package
package main
import (
"flag"
"fmt"
"go/build"
"io"
"log"
"os"
"os/exec"
"path"
"regexp"
"strings"
"github.com/pkg/browser"
)
var (
pkgs = make(map[string][]string)
matchvar = flag.String("match", ".*", "filter packages")
stdout = flag.Bool("stdout", false, "print to standard output instead of browser")
pkgmatch *regexp.Regexp
)
func findImport(p string) {
if !pkgmatch.MatchString(p) {
// doesn't match the filter, skip it
return
}
if p == "C" {
// C isn't really a package
pkgs["C"] = nil
}
if _, ok := pkgs[p]; ok {
// seen this package before, skip it
return
}
if strings.HasPrefix(p, "golang_org") {
p = path.Join("vendor", p)
}
pkg, err := build.Import(p, "", 0)
if err != nil {
log.Fatal(err)
}
pkgs[p] = filter(pkg.Imports)
for _, pkg := range pkgs[p] {
findImport(pkg)
}
}
func filter(s []string) []string {
var r []string
for _, v := range s {
if pkgmatch.MatchString(v) {
r = append(r, v)
}
}
return r
}
func allKeys() []string {
keys := make(map[string]bool)
for k, v := range pkgs {
keys[k] = true
for _, v := range v {
keys[v] = true
}
}
v := make([]string, 0, len(keys))
for k, _ := range keys {
v = append(v, k)
}
return v
}
func keys() map[string]int {
m := make(map[string]int)
for i, k := range allKeys() {
m[k] = i
}
return m
}
func init() {
flag.Parse()
pkgmatch = regexp.MustCompile(*matchvar)
}
func check(err error) {
if err != nil {
log.Fatal(err)
}
}
func main() {
for _, pkg := range flag.Args() {
findImport(pkg)
}
cmd := exec.Command("dot", "-Tsvg")
in, err := cmd.StdinPipe()
check(err)
out, err := cmd.StdoutPipe()
cmd.Stderr = os.Stderr
check(cmd.Start())
fmt.Fprintf(in, "digraph {\n")
keys := keys()
for p, i := range keys {
fmt.Fprintf(in, "\tN%d [label=%q,shape=box];\n", i, p)
}
for k, v := range pkgs {
for _, p := range v {
fmt.Fprintf(in, "\tN%d -> N%d [weight=1];\n", keys[k], keys[p])
}
}
fmt.Fprintf(in, "}\n")
in.Close()
if *stdout {
// print to standard output
io.Copy(os.Stdout, out)
} else {
// pipe output to browser
ch := make(chan error)
go func() {
ch <- browser.OpenReader(out)
}()
check(cmd.Wait())
if err := <-ch; err != nil {
log.Fatalf("unable to open browser: %s", err)
}
}
}