11da2a6c9b
The purpose of this is to make it easier to maintain and eventually to allow the rclone backends to be re-used in other projects without having to use the rclone configuration system. The new code layout is documented in CONTRIBUTING.
80 lines
2.2 KiB
Go
80 lines
2.2 KiB
Go
package cat
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import (
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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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"github.com/ncw/rclone/cmd"
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"github.com/ncw/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(commandDefintion)
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commandDefintion.Flags().Int64VarP(&head, "head", "", head, "Only print the first N characters.")
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commandDefintion.Flags().Int64VarP(&tail, "tail", "", tail, "Only print the last N characters.")
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commandDefintion.Flags().Int64VarP(&offset, "offset", "", offset, "Start printing at offset N (or from end if -ve).")
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commandDefintion.Flags().Int64VarP(&count, "count", "", count, "Only print N characters.")
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commandDefintion.Flags().BoolVarP(&discard, "discard", "", discard, "Discard the output instead of printing.")
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}
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var commandDefintion = &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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Long: `
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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 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 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(fsrc, w, offset, count)
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})
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},
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}
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