56 lines
1.1 KiB
Go
56 lines
1.1 KiB
Go
package cat
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import (
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"fmt"
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"log"
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"os"
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"strings"
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"github.com/brtholomy/um/go/cmd"
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"github.com/brtholomy/um/go/flags"
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"github.com/brtholomy/um/go/pipe"
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)
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const (
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CMD = cmd.Cat
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SUMMARY = "cat um files together using a filelist"
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SEPARATOR = "\n---\n\n"
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)
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type options struct {
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Filelist flags.Arg
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Help flags.Flag[bool]
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}
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func initOpts() options {
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return options{
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flags.Arg{"", "filelist. accepts from stdin if not provided"},
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flags.Flag[bool]{"--help", "-h", false, "show help"},
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}
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}
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func cat(files []string) (string, error) {
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ff := make([]string, 0, len(files))
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for _, f := range files {
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dat, err := os.ReadFile(f)
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if err != nil {
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return "", fmt.Errorf("error opening file: %w", err)
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}
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ff = append(ff, string(dat))
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}
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return strings.Join(ff, SEPARATOR), nil
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}
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func Cat(args []string) {
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opts := initOpts()
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flags.ParseArgs(CMD, SUMMARY, args, &opts)
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files, err := pipe.FileListSplitMaybeStdin(opts.Filelist.Val)
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if err != nil {
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log.Fatalf("um %s: %s", CMD, err)
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}
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s, err := cat(files)
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if err != nil {
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log.Fatalf("um %s: %s", CMD, err)
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}
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fmt.Print(s)
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}
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