# encode stream (stdin) -> tar-stream (stdout)
$ cat FILE | qed

# decode tar-stream (stdin) -> stream of the original contents (stdout)
$ cat FILE | qed | qed -d

# encode FILE_OR_DIR via argument -> tar-stream (stdout)
$ qed FILE_OR_DIR

# encode FILE_OR_DIR via argument -> filepath of TAR_FILE (stdout)
$ qed FILE_OR_DIR > TAR_FILE

# the same as above
$ qed -o TAR_FILE FILE_OR_DIR

# create a video as a QR code slideshow
$ qed -p FILE_OR_DIR

# create a HTML of QR code images
$ qed -q FILE_OR_DIR

# decode TAR_FILE via argument -> the original data's stream (stdout)
$ qed -d TAR_FILE

# can also decode a single IMAGE (*.png, *.jpg, ...) -> the original data's stream (stdout)
$ qed -d IMAGE

# can also decode a single VIDEO (*.mp4, *.mov, ...) -> the original data's stream (stdout)
$ qed -d VIDEO

# can also decode DIRECTORY conataining IMAGE(s) -> the original data's stream (stdout)
# data are automatically selected if various kinds of data are mixed.
$ qed -d DIRECTORY

# decode TAR_FILE via argument -> filepath of a single concatanated file (stdout)
$ qed -d TAR_FILE > FILE

# decode TAR_FILE via argument -> filepath of NEW_DIR of the original contents (stdout)
$ qed -d -o NEW_DIR TAR_FILE

# -v increases verbosity. it shows the details how the work is progressing.
$ qed -v FILE_OR_DIR | qed -dv

# prerequisites
# ffmpeg is optional as only used with '-p' option.
$ brew install zbar qrencode imagemagick ffmpeg

# clone
$ git clone https://github.com/thyeem/qed.git
$ cd qed

# put the 'qed' file in $PATH direcoty like $HOME/.local/bin/ if needed
$ chmod +x qed && cp $_ $HOME/.local/bin

# check it out if you want to know it works well. This may take a while.
$ sh test.sh

# get the encoding result of QR images in the current dir
$ qed FILE_OR_DIR | tar xv

# get the encoding result of QR images in the specified DIR
$ qed FILE_OR_DIR | tar xv -C DIR

# compress the QR code tarball after encoding
$ cat FILE | qed | gzip -c > tmp.tar.gz

# uncompress the tar.gz archive then decode. go back to FILE again
$ gunzip -c tmp.tar.gz | qed -d

# create and play a mp4 video (QR code slideshow) when encoding is finished
$ qed -p FILE | xargs open

# create and open QR code images on browser when encoding is finished
$ qed -q FILE | xargs open

# stream -> tar stream -> stream
$ curl -sL https://google.com | qed | qed -d

# stream -> QR-image mp4 file -> stream
$ curl -sL https://google.com | qed -p | xargs qed -d

# FILE_OR_DIR -> tar stream -> NEW_DIR of the original contents
$ qed FILE_OR_DIR | qed -d -o NEW_DIR

# with other encoder
$ echo "QED: QR.Encoder.Decoder" | base64 | qed | qed -d | base64 -d

# backing up directory with qed: does the same thing as tar
# $ tar -cvf - FROM_DIR | tar -xv -C TO_DIR
$ qed -v FROM_DIR | qed -dv -o TO_DIR