lilleman
65 lines
1.7 KiB
Go
65 lines
1.7 KiB
Go
// Command fakes prints one fake value from one or more data directories.
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//
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// fakes ./data/sv_SE person # a full person
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// fakes ./data/sv_SE person.last # just the surname (dotted path)
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// fakes ./data sv_SE.person # point at the tree, address by folder
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// fakes ./data/sv_SE ./mydata person # layer custom data; last dir wins
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// fakes -seed 42 ./data/sv_SE address
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//
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// It is a thin CLI over the fakes library: New(dirs) then Fake(path).
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package main
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import (
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"flag"
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"fmt"
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"io"
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"os"
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"github.com/Timewave-AB/fakes"
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)
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const usage = `Usage: fakes [-seed N] <data-dir>... <path>
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<data-dir> one or more data directories, e.g. ./data/sv_SE (last wins on clash)
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<path> a category, or a dotted path into one (person, person.last)
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-seed N seed for reproducible output`
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func main() { os.Exit(run(os.Args[1:], os.Stdout, os.Stderr)) }
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// run is main's testable core: it returns the process exit code (0 ok, 1
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// runtime error, 2 misuse) and writes only to the given streams.
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func run(args []string, stdout, stderr io.Writer) int {
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fs := flag.NewFlagSet("fakes", flag.ContinueOnError)
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fs.SetOutput(stderr)
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fs.Usage = func() { fmt.Fprintln(stderr, usage) }
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seed := fs.Uint64("seed", 0, "seed for reproducible output")
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if err := fs.Parse(args); err != nil {
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return 2
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}
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if fs.NArg() < 2 {
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fs.Usage()
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return 2
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}
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var opts []fakes.Option
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fs.Visit(func(fl *flag.Flag) {
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if fl.Name == "seed" {
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opts = append(opts, fakes.WithSeed(*seed))
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}
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})
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dirs, path := fs.Args()[:fs.NArg()-1], fs.Arg(fs.NArg()-1)
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f, err := fakes.New(dirs, opts...)
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if err != nil {
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fmt.Fprintln(stderr, err)
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return 1
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}
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v, err := f.Fake(path)
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if err != nil {
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fmt.Fprintln(stderr, err)
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return 1
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}
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fmt.Fprintln(stdout, v)
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return 0
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}
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