tcl

• infos = Information about the tcl plugin is in keys below
• infos/author = Markus Raab elektra@libelektra.org
• infos/licence = BSD
• infos/provides = storage/tcl
• infos/needs = code null binary
• infos/placements = setstorage getstorage
• infos/status = unfinished concept
• infos/description = Serialize tcl lists

Introduction

This plugin is a storage plugin which writes keys to lists in the style of the Tcl programming language.

Format

The format does not have significant spaces. The advantage of TCL style lists is that also arbitrary metadata can be embedded in a natural and distinguish-able style. It looks like:

{
    {
        key=val
        {
            metakey = b
        }
        {
            comment = huhu
        }
    }
}

Basic Usage

# Mount Tcl plugin to namespace `user/examples/tcl`
# We add the required plugins (instead of the plugin providers)
# for `tcl` manually, since otherwise this command leaks memory.
sudo kdb mount config.tcl user/tests/tcl tcl ccode null base64

# Add a key value pair to the database
kdb set user/tests/tcl/key value
# The Tcl plugin also supports metadata
kdb setmeta user/tests/tcl/key comment "This key contains example data."
# A known limitation of the plugin is that it discards whitespace characters
kdb getmeta user/tests/tcl/key comment
#> Thiskeycontainsexampledata.

kdb export user/tests/tcl tcl
#> {
#> 	{
#> 		key = value
#> 		{
#> 			comment = Thiskeycontainsexampledata.
#> 		}
#> 	}
#> }

# Undo modifications
kdb rm -r user/tests/tcl
sudo kdb umount user/tests/tcl

Binary Data

The plugin also supports binary data via the base64 plugin and null keys via the null plugin.

# Mount plugin
sudo kdb mount config.tcl user/tests tcl ccode null base64

# Import some data
kdb import user/tests/dump xmltool < src/plugins/xmltool/xmltool/dump.xml

# Take a look at imported data
kdb ls user/tests/dump
#> user/tests/dump/.HiddenBinaryKey
#> user/tests/dump/.HiddenDirectoryKey
#> user/tests/dump/.HiddenStringKey
#> user/tests/dump/PerfectBinaryKey
#> user/tests/dump/PerfectDirectoryKey
#> user/tests/dump/PerfectStringKey
#> user/tests/dump/Ug.ly:Bin@a€ryKey
#> user/tests/dump/Ug.ly:Dir@ect€oryKey
#> user/tests/dump/Ug.ly:St@ri€n.gKey

# The plugin supports binary data…
kdb get user/tests/dump/PerfectBinaryKey
#> \x42\x69\x6e\x61\x72\x79\x56\x61\x6c\x75\x65\x0

# … and empty keys
kdb get user/tests/dump/Ug.ly:Bin@a€ryKey

# Undo modifications
kdb rm -r user/tests
sudo kdb umount user/tests

Limitations

• whitespaces are discarded
• no comments

Dependencies

• libboost-dev