86 lines
2.4 KiB
Go
86 lines
2.4 KiB
Go
// Package cat provides the cat command.
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package cat
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import (
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"context"
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"io"
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"io/ioutil"
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"log"
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"os"
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"strings"
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"github.com/rclone/rclone/cmd"
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"github.com/rclone/rclone/fs/config/flags"
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"github.com/rclone/rclone/fs/operations"
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"github.com/spf13/cobra"
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)
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// Globals
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var (
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head = int64(0)
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tail = int64(0)
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offset = int64(0)
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count = int64(-1)
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discard = false
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)
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func init() {
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cmd.Root.AddCommand(commandDefinition)
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cmdFlags := commandDefinition.Flags()
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flags.Int64VarP(cmdFlags, &head, "head", "", head, "Only print the first N characters")
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flags.Int64VarP(cmdFlags, &tail, "tail", "", tail, "Only print the last N characters")
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flags.Int64VarP(cmdFlags, &offset, "offset", "", offset, "Start printing at offset N (or from end if -ve)")
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flags.Int64VarP(cmdFlags, &count, "count", "", count, "Only print N characters")
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flags.BoolVarP(cmdFlags, &discard, "discard", "", discard, "Discard the output instead of printing")
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}
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var commandDefinition = &cobra.Command{
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Use: "cat remote:path",
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Short: `Concatenates any files and sends them to stdout.`,
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// Warning! "|" will be replaced by backticks below
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Long: strings.ReplaceAll(`
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rclone cat sends any files to standard output.
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You can use it like this to output a single file
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rclone cat remote:path/to/file
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Or like this to output any file in dir or its subdirectories.
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rclone cat remote:path/to/dir
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Or like this to output any .txt files in dir or its subdirectories.
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rclone --include "*.txt" cat remote:path/to/dir
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Use the |--head| flag to print characters only at the start, |--tail| for
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the end and |--offset| and |--count| to print a section in the middle.
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Note that if offset is negative it will count from the end, so
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|--offset -1 --count 1| is equivalent to |--tail 1|.
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`, "|", "`"),
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Run: func(command *cobra.Command, args []string) {
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usedOffset := offset != 0 || count >= 0
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usedHead := head > 0
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usedTail := tail > 0
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if usedHead && usedTail || usedHead && usedOffset || usedTail && usedOffset {
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log.Fatalf("Can only use one of --head, --tail or --offset with --count")
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}
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if head > 0 {
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offset = 0
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count = head
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}
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if tail > 0 {
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offset = -tail
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count = -1
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}
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cmd.CheckArgs(1, 1, command, args)
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fsrc := cmd.NewFsSrc(args)
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var w io.Writer = os.Stdout
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if discard {
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w = ioutil.Discard
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}
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cmd.Run(false, false, command, func() error {
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return operations.Cat(context.Background(), fsrc, w, offset, count)
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})
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},
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}
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