github.com/westcoastroms/westcoastroms-build@v0.0.0-20190928114312-2350e5a73030/build/blueprint/bootstrap/bpglob/bpglob.go (about)

     1  // Copyright 2015 Google Inc. All rights reserved.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  // bpglob is the command line tool that checks if the list of files matching a glob has
    16  // changed, and only updates the output file list if it has changed.  It is used to optimize
    17  // out build.ninja regenerations when non-matching files are added.  See
    18  // github.com/google/blueprint/bootstrap/glob.go for a longer description.
    19  package main
    20  
    21  import (
    22  	"flag"
    23  	"fmt"
    24  	"os"
    25  
    26  	"github.com/google/blueprint/pathtools"
    27  )
    28  
    29  var (
    30  	out = flag.String("o", "", "file to write list of files that match glob")
    31  
    32  	excludes multiArg
    33  )
    34  
    35  func init() {
    36  	flag.Var(&excludes, "e", "pattern to exclude from results")
    37  }
    38  
    39  type multiArg []string
    40  
    41  func (m *multiArg) String() string {
    42  	return `""`
    43  }
    44  
    45  func (m *multiArg) Set(s string) error {
    46  	*m = append(*m, s)
    47  	return nil
    48  }
    49  
    50  func (m *multiArg) Get() interface{} {
    51  	return m
    52  }
    53  
    54  func usage() {
    55  	fmt.Fprintln(os.Stderr, "usage: bpglob -o out glob")
    56  	flag.PrintDefaults()
    57  	os.Exit(2)
    58  }
    59  
    60  func main() {
    61  	flag.Parse()
    62  
    63  	if *out == "" {
    64  		fmt.Fprintln(os.Stderr, "error: -o is required")
    65  		usage()
    66  	}
    67  
    68  	if flag.NArg() != 1 {
    69  		usage()
    70  	}
    71  
    72  	_, err := pathtools.GlobWithDepFile(flag.Arg(0), *out, *out+".d", excludes)
    73  	if err != nil {
    74  		fmt.Fprintf(os.Stderr, "error: %s\n", err.Error())
    75  		os.Exit(1)
    76  	}
    77  }