// createDOT creates a DOT graph with the given file name.
func createDOT(stepName string, graph *dot.Graph) error {
dotPath := stepName + ".dot"
if !flagQuiet {
log.Printf("Creating: %q", dotPath)
}
buf := []byte(graph.String())
if err := ioutil.WriteFile(dotPath, buf, 0644); err != nil {
return errutil.Err(err)
}
// Generate an image representation of the control flow graph.
if flagImage {
pngPath := stepName + ".png"
if !flagQuiet {
log.Printf("Creating: %q", pngPath)
}
cmd := exec.Command("dot", "-Tpng", "-o", pngPath, dotPath)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
if err := cmd.Run(); err != nil {
return errutil.Err(err)
}
}
return nil
}
// dump stores the graph as a DOT file and an image representation of the graph
// as a PNG file with filenames based on "-o" flag.
func dump(graph *dot.Graph) error {
// Store graph to DOT file.
dotPath := flagOut
if !flagQuiet {
log.Printf("Creating: %q\n", dotPath)
}
err := ioutil.WriteFile(dotPath, []byte(graph.String()), 0644)
if err != nil {
return errutil.Err(err)
}
// Generate an image representation of the graph.
if flagImage {
pngPath := pathutil.TrimExt(dotPath) + ".png"
if !flagQuiet {
log.Printf("Creating: %q\n", pngPath)
}
cmd := exec.Command("dot", "-Tpng", "-o", pngPath, dotPath)
cmd.Stdout = os.Stdout
cmd.Stderr = os.Stderr
err = cmd.Run()
if err != nil {
return errutil.Err(err)
}
}
return nil
}