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flags.go
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flags.go
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// Copyright 2020 Serge Léger. All rights reserved.
// Use of this source code is governed by an MIT
// license that can be found in the LICENSE file.
package main
import (
"errors"
"flag"
"fmt"
)
// Flags contains the command line parameters.
type Flags struct {
Output string
JSONLines bool
Template string
Args []string
}
// Parse parses the command line parameters.
func (f *Flags) Parse(args []string) error {
var unsafe bool
flags := flag.NewFlagSet(args[0], flag.ExitOnError)
flags.StringVar(&f.Output, "o", "-", "output `file`, defaults to stdout")
flags.BoolVar(&f.JSONLines, "jsonl", false, "read JSON-line encoded files")
flags.BoolVar(&unsafe, "unsafe", false, "enable unsafe version of the execute function")
flags.Usage = func() {
fmt.Fprintf(flags.Output(), "Usage: %s [options] mdtemplate [ jsonFile* ]\n", args[0])
flag.PrintDefaults()
}
flags.Parse(args[1:])
// enable unsafe version of execute function.
if unsafe {
templateFuncs["execute"] = executeUnsafe
}
// capture the remaining arguments
args = flags.Args()
if len(args) == 0 {
return errors.New("error: missing template file")
}
f.Template = args[0]
f.Args = args[1:]
return nil
}