xref: /aosp_15_r20/build/make/tools/canoninja/cmd/canoninja.go (revision 9e94795a3d4ef5c1d47486f9a02bb378756cea8a)

package main

/*
   Canoninja reads a Ninja file and changes the rule names to be the digest of the rule contents.
   Feed  it to a filter that extracts only build statements, sort them, and you will have a crude
   but effective tool to find small differences between two Ninja files.
*/

import (
	"canoninja"
	"flag"
	"fmt"
	"os"
)

func main() {
	flag.Parse()
	files := flag.Args()
	if len(files) == 0 {
		files = []string{"/dev/stdin"}
	}
	rc := 0
	for _, f := range files {
		if buffer, err := os.ReadFile(f); err == nil {
			err = canoninja.Generate(f, buffer, os.Stdout)
			if err != nil {
				fmt.Fprintln(os.Stderr, err)
				rc = 1
			}
		} else {
			fmt.Fprintf(os.Stderr, "%s: %s\n", f, err)
			rc = 1
		}
	}
	os.Exit(rc)
}