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// Copyright 2017 Google LLC. 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.
// Package cmd contains common code for the various binaries in this repository.
package cmd
import (
"errors"
"flag"
"os"
"bitbucket.org/creachadair/shell"
)
func parseFlags(file string) error {
args, valid := shell.Split(file)
if !valid {
return errors.New("flag file contains unclosed quotations")
}
// Expand any environment variables in the args
for i := range args {
args[i] = os.ExpandEnv(args[i])
}
if err := flag.CommandLine.Parse(args); err != nil {
return err
}
// Call flag.Parse() again so that command line flags
// can override flags provided in the provided flag file.
flag.Parse()
return nil
}
// ParseFlagFile parses a set of flags from a file at the provided
// path. Re-calls flag.Parse() after parsing the flags in the file
// so that flags provided on the command line take precedence over
// flags provided in the file.
func ParseFlagFile(path string) error {
file, err := os.ReadFile(path)
if err != nil {
return err
}
return parseFlags(string(file))
}
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