58 lines
1.3 KiB
Go
58 lines
1.3 KiB
Go
package pipe
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import (
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"errors"
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"fmt"
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"io"
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"log"
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"os"
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"strings"
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)
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const Newline string = "\n"
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func isStdinLoaded() bool {
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stat, _ := os.Stdin.Stat()
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return (stat.Mode() & os.ModeCharDevice) == 0
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}
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func GetStdin() ([]string, error) {
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if !isStdinLoaded() {
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return nil, errors.New("stdin not loaded")
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}
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dat, err := io.ReadAll(os.Stdin)
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if err != nil {
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log.Fatal(err)
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}
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// TODO: there's got to be a better way:
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s := strings.TrimSuffix(string(dat), Newline)
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return strings.Split(s, Newline), nil
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}
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// reads files from stdin if present, otherwise from the filename:
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func FileListSplitMaybeStdin(f string) ([]string, error) {
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filelist, err := GetStdin()
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if err != nil {
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// BORK: don't see a neater way of wrapping these two when we depend on the non-nil in this block:
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// if i just return FileListSplit(), we lose the first err
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filelist, err2 := FileListSplit(f)
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if err2 != nil {
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return nil, fmt.Errorf("%w: %w", err, err2)
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}
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return filelist, nil
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}
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return filelist, nil
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}
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// opens the given filename and splits into lines:
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func FileListSplit(f string) ([]string, error) {
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if f == "" {
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return nil, errors.New("filename is empty")
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}
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dat, err := os.ReadFile(f)
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if err != nil {
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return nil, fmt.Errorf("error opening file: %w", err)
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}
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s := strings.TrimSuffix(string(dat), Newline)
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return strings.Split(s, Newline), nil
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}
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