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https://github.com/foo-dogsquared/dotfiles.git
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57 lines
1.6 KiB
Plaintext
57 lines
1.6 KiB
Plaintext
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#!/usr/bin/env sh
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# Extracts the archive.
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# The process can vary depending on the file extension.
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# Usage: $0 ARCHIVE_FILE
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# Dependencies:
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# * xxd V1.10 27oct98 by Juergen Weigert
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# * UnZip 6.00 of 20 April 2009
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# * tar (GNU tar) 1.32
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# * printf (GNU coreutils 8.31)
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function get_bytes() {
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local file=$1
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local length=${2:-20}
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# Getting the file signature.
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# At most, we will just get the first 20 bytes of the file.
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local file_sig=$(xxd -l "$length" -ps "$file")
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printf "$file_sig"
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}
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function extract_path_without_ext() {
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local path=$1
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local filename=$(basename -- "$path")
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# Return the filename without the file extension.
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# For more information, you can look up the parameter expansion in
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# https://www.gnu.org/software/bash/manual/html_node/Shell-Parameter-Expansion.html.
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# Even if the filename has no extension, it will print the whole filename.
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printf "${filename%.*}"
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}
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function extract_file() {
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local file=$1
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local length=$2
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# Checking the file signatures.
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# The reference is at https://en.wikipedia.org/wiki/List_of_file_signatures.
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local file_sig=$(get_bytes "$file" "$length")
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# Extracting the extension out of the given file and creating a directory out of it.
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local file_without_ext=$(extract_path_without_ext "$file")
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mkdir -p "$file_without_ext"
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# Checking if the file signature matches of a zip
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if [[ $(printf "$file_sig" | head -c 4) == "504b" ]]; then
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cd "$file_without_ext" && unzip "../$file"
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else
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tar xf "$file" --directory "$file_without_ext"
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fi
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}
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extract_file $1
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