bash : add pack/unpack.

.README.md

@@ -457,6 +457,13 @@ Command|Description
 `dcpu [SERVICE]`|Update and recreate a compose service.
 `dcul [SERVICE]`|Start a compose service and show its logs.
 
+## Pack.
+
+Command|Description
+---|---
+`pack <TARGET.ext> <FILES>`|Create desired file format with other files.
+`unpack <FILES>`|Attempt to extract file content.
+
 ## Environment variables.
 
 Variable|Description

.linux/bash/module/pack.sh

@@ -0,0 +1,175 @@
+_PACK_SUPPORTED=".tar$|.zip$"
+
+# Pack files into desired format.
+# Usage: pack <TARGET.ext> <FILES>
+pack()
+{
+  local output="${1}"
+  local targets=("${@:2}")
+  local format="${output##*.}"
+  local name="${output%.*}"
+
+  # report no output.
+  if [[ "${output}" = "" ]]; then
+    echo "Usage: pack <TARGET.ext> <FILES>"
+    return 1
+  fi
+
+  # report no format.
+  if [[ "${format}" = "" ]]; then
+    echo "Could not determine output format."
+    echo "Usage: pack <TARGET.ext> <FILES>"
+    return 2
+  fi
+
+  # report no targets.
+  if [[ "${targets}" = "" ]]; then
+    echo "Usage: pack <TARGET.ext> <FILES>"
+    return 3
+  fi
+
+  # process.
+  case "${format}" in
+    "tgz")
+      _pack_tgz "${@}"
+      ;;
+    "txz")
+      _pack_txz "${@}"
+      ;;
+    "tar")
+      _pack_tar "${@}"
+      ;;
+    "zip")
+      _pack_zip "${@}"
+      ;;
+  esac
+}
+
+# attempt to unpack everything.
+# usage: unpack <FILES>
+unpack()
+{
+  local targets=("${@}")
+  local count=0
+  local failed=0
+  local total=${#targets[@]}
+
+  # show error if no target specified.
+  if [[ "${targets}" = "" ]]; then
+    targets=($(ls | grep -E ${_PACK_SUPPORTED}))
+    total=${#targets[@]}
+  fi
+
+  # process all files.
+  for target in "${targets[@]}"; do
+    # increment counter.
+    ((count++))
+
+    # prepare status.
+    local status="[${count}/${total}] ${target}"
+
+    # show status.
+    echo -e "${status}"
+
+    # unpack file type.
+    local type="${target##*.}"
+
+    # unpack content.
+    case "${type,,}" in
+      "zip")
+        _unpack_zip "${target}"
+        ;;
+      "7z")
+        _unpack_7z "${target}"
+        ;;
+      "tgz")
+        _unpack_tgz "${target}"
+        ;;
+      "txz")
+        _unpack_txz "${target}"
+        ;;
+      "tar")
+        _unpack_tar "${target}"
+        ;;
+      *)
+        echo "${target}: format not supported."
+        return 2
+        ;;
+    esac
+
+    # actions on error.
+    if [[ $? != 0 ]]; then
+      _error "${target}"
+      ((failed++))
+    fi
+  done 
+
+  # print report.
+  if [[ ${count} -gt 1 ]]; then
+    if [[ ${failed} -gt 0 ]]; then
+      echo -e "${color_bred}Items failed to unpack: ${failed}.${color_default}"
+    else
+      echo -e "${color_green}All successful.${color_default}"
+    fi
+  fi
+}
+
+# show error.
+_error()
+{
+  echo -e "${color_bred}${1}: failed.${color_default}"
+}
+
+# Pack zip.
+_pack_zip()
+{
+  zip -9 -r "${@}"
+}
+
+# pack tgz.
+_pack_tgz()
+{
+  tar -c "${@:2}" | pv -s $(du -csb "${@:2}" | sed -n -e '$p' | awk '{print $1}') | gzip -1 > "${1}"
+}
+
+# pack txz.
+_pack_txz()
+{
+  tar -c "${@:2}" | pv -s $(du -csb "${@:2}" | sed -n -e '$p' | awk '{print $1}') | xz -9e > "${1}"
+}
+
+# pack tar.
+_pack_tar()
+{
+  tar -c "${@:2}" | pv -s $(du -csb "${@:2}" | sed -n -e '$p' | awk '{print $1}') > "${1}"
+}
+
+# unpack zip archive.
+_unpack_zip()
+{
+  unzip "${1}"
+}
+
+# unpack 7z archive.
+_unpack_7z()
+{
+  7z x "${1}"
+}
+
+# unpack tgz archive.
+_unpack_tgz()
+{
+  pv "${1}" | gzip -d | tar -xf -
+}
+
+# unpack txz archive.
+_unpack_txz()
+{
+  pv "${1}" | xz -d | tar -xf -
+}
+
+# unpack tar archive.
+_unpack_tar()
+{
+  pv "${1}" | tar -xf -
+}