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// Copyright 2015 Google Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// bpglob is the command line tool that checks if the list of files matching a glob has
// changed, and only updates the output file list if it has changed. It is used to optimize
// out build.ninja regenerations when non-matching files are added. See
// github.com/google/blueprint/bootstrap/glob.go for a longer description.
package main
import (
"flag"
"fmt"
"io/ioutil"
"os"
"time"
"github.com/google/blueprint/pathtools"
)
var (
out = flag.String("o", "", "file to write list of files that match glob")
excludes multiArg
)
func init() {
flag.Var(&excludes, "e", "pattern to exclude from results")
}
type multiArg []string
func (m *multiArg) String() string {
return `""`
}
func (m *multiArg) Set(s string) error {
*m = append(*m, s)
return nil
}
func (m *multiArg) Get() interface{} {
return m
}
func usage() {
fmt.Fprintln(os.Stderr, "usage: bpglob -o out glob")
flag.PrintDefaults()
os.Exit(2)
}
func main() {
flag.Parse()
if *out == "" {
fmt.Fprintln(os.Stderr, "error: -o is required")
usage()
}
if flag.NArg() != 1 {
usage()
}
_, err := pathtools.GlobWithDepFile(flag.Arg(0), *out, *out+".d", excludes)
if err != nil {
// Globs here were already run in the primary builder without error. The only errors here should be if the glob
// pattern was made invalid by a change in the pathtools glob implementation, in which case the primary builder
// needs to be rerun anyways. Update the output file with something that will always cause the primary builder
// to rerun.
s := fmt.Sprintf("%s: error: %s\n", time.Now().Format(time.StampNano), err.Error())
err := ioutil.WriteFile(*out, []byte(s), 0666)
if err != nil {
fmt.Fprintf(os.Stderr, "error: %s\n", err.Error())
os.Exit(1)
}
}
}
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