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5d6b8141ec
As of Go 1.16, the same functionality is now provided by package io or package os, and those implementations should be preferred in new code.
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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"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 = io.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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