Bash-Funk "compression" module

The following statements are automatically executed when this module loads:

alias -- -tgz="-tar-gz"
alias -- -tzst="-tar-zstd"
alias -- -utgz="-untar-gz"
alias -- -utzst="-untar-zstd"

The following commands are available when this module is loaded:

-tar-gz
-tar-zstd
-test-all-compression
-untar-gz
-untar-zstd

License

SPDX-FileCopyrightText: © Vegard IT GmbH (https://vegardit.com)
SPDX-License-Identifier: Apache-2.0

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    https://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

-tar-gz

Usage: -tar-gz [OPTION]... ARCHIVE PATH1 [PATH]...

Compresses the given files using tar and gzip displaying a real-time progress bar.

Requirements:
  + Command 'cut' must be available.
  + Command 'du' must be available.
  + Command 'tail' must be available.
  + Command 'tar' must be available.
  + Command 'gzip' must be available.

Parameters:
  ARCHIVE (required, file)
      The file path of the archive to create.
  PATH (1 or more required, path)
      Files and directories to compress.

Options:
    --checkpoint
        Use tar's --checkpoint feature instead of pv for progress monitoring. This is considerably slower in Cygwin.
    -----------------------------
    --help
        Prints this help.
    --tracecmd
        Enables bash debug mode (set -x).
    --selftest
        Performs a self-test.
    --
        Terminates the option list.

Implementation:

if hash pv && [[ ! $_checkpoint ]]; then
   local total_bytes=$(du -csb "${_PATH[@]}" | tail -1 | cut -f1) &&
   tar -cf - "${_PATH[@]}" | pv -s $total_bytes | gzip > "$_ARCHIVE"
else
   printf '=> %s\n' "${_PATH[@]}"
   local total_kb=$(du -csk "${_PATH[@]}" | tail -1 | cut -f1) &&
   tar cfvz "${_ARCHIVE}" "${_PATH[@]}" --record-size=1K --checkpoint="$(($total_kb/100))" --checkpoint-action=exec=" printf '%3d/100%%\r' \$((100*\$TAR_CHECKPOINT/$total_kb)) " --totals
fi

-tar-zstd

Usage: -tar-zstd [OPTION]... ARCHIVE PATH1 [PATH]...

Compresses the given files using tar and zstd (https://github.com/facebook/zstd) displaying a real-time progress bar.

Requirements:
  + Command 'cut' must be available.
  + Command 'du' must be available.
  + Command 'tail' must be available.
  + Command 'tar' must be available.
  + Command 'zstd' must be available.

Parameters:
  ARCHIVE (required, file)
      The file path of the archive to create.
  PATH (1 or more required, path)
      Files and directories to compress.

Options:
    --checkpoint
        Use tar's --checkpoint feature instead of pv for progress monitoring. This is considerably slower in Cygwin.
    -----------------------------
    --help
        Prints this help.
    --tracecmd
        Enables bash debug mode (set -x).
    --selftest
        Performs a self-test.
    --
        Terminates the option list.

Implementation:

if hash pv && [[ ! $_checkpoint ]]; then
   printf '=> %s\n' "${_PATH[@]}"
   local total_bytes=$(du -csb "${_PATH[@]}" | tail -1 | cut -f1) &&
   tar -cf - "${_PATH[@]}" | pv -s $total_bytes | zstd > "$_ARCHIVE"
else
   local total_kb=$(du -csk "${_PATH[@]}" | tail -1 | cut -f1) &&
   tar cfv "${_ARCHIVE}" "${_PATH[@]}" -Izstd --record-size=1K --checkpoint="$(($total_kb/100))" --checkpoint-action=exec=" printf '%3d/100%%\r' \$((100*\$TAR_CHECKPOINT/$total_kb)) " --totals
fi

-test-all-compression

Usage: -test-all-compression [OPTION]...

Performs a selftest of all functions of this module by executing each function with option '--selftest'.

Options:
    --help
        Prints this help.
    --tracecmd
        Enables bash debug mode (set -x).
    --selftest
        Performs a self-test.
    --
        Terminates the option list.

Implementation:

-tar-gz --selftest && echo || return 1
-tar-zstd --selftest && echo || return 1
-untar-gz --selftest && echo || return 1
-untar-zstd --selftest && echo || return 1

-untar-gz

Usage: -untar-gz [OPTION]... ARCHIVE [TARGET_DIR]

Decompresses the given archive using gzip and tar displaying a real-time progress bar.

Requirements:
  + Command 'cut' must be available.
  + Command 'du' must be available.
  + Command 'tar' must be available.
  + Command 'gzip' must be available.

Parameters:
  ARCHIVE (required, file)
      Archive to decompress.
  TARGET_DIR (default: '.', directory)
      Decompress location.

Options:
    --checkpoint
        Use tar's --checkpoint feature instead of pv for progress monitoring. This is considerably slower in Cygwin.
    -----------------------------
    --help
        Prints this help.
    --tracecmd
        Enables bash debug mode (set -x).
    --selftest
        Performs a self-test.
    --
        Terminates the option list.

Implementation:

if hash pv && [[ ! $_checkpoint ]]; then
   pv "${_ARCHIVE}" --interval 0.5 | tar xzfv - -C "$_TARGET_DIR"
else
   local total_kb=$(du -k "${_ARCHIVE}" | cut -f1) &&
   tar xzfv "${_ARCHIVE}" -C "$_TARGET_DIR" --record-size=1K --checkpoint="$(($total_kb/100))" --checkpoint-action=exec=" printf '%3d/100%%\r' \$((100*\$TAR_CHECKPOINT/$total_kb)) " --totals
fi

-untar-zstd

Usage: -untar-zstd [OPTION]... ARCHIVE [TARGET_DIR]

Decompresses the given archive using zstd (https://github.com/facebook/zstd) and tar displaying a real-time progress bar.

Requirements:
  + Command 'cut' must be available.
  + Command 'du' must be available.
  + Command 'tar' must be available.
  + Command 'zstd' must be available.

Parameters:
  ARCHIVE (required, file)
      Archive to decompress.
  TARGET_DIR (default: '.', directory)
      Decompress location.

Options:
    --checkpoint
        Use tar's --checkpoint feature instead of pv for progress monitoring. This is considerably slower in Cygwin.
    -----------------------------
    --help
        Prints this help.
    --tracecmd
        Enables bash debug mode (set -x).
    --selftest
        Performs a self-test.
    --
        Terminates the option list.

Implementation:

if hash pv && [[ ! $_checkpoint ]]; then
   pv "${_ARCHIVE}" --interval 0.5 | zstd -d | tar xfv - -C "$_TARGET_DIR"
else
   local total_kb=$(du -k "${_ARCHIVE}" | cut -f1) &&
   tar xfv "${_ARCHIVE}" -C "$_TARGET_DIR" -Izstd --record-size=1K --checkpoint="$(($total_kb/100))" --checkpoint-action=exec=" printf '%3d/100%%\r' \$((100*\$TAR_CHECKPOINT/$total_kb)) " --totals
fi

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