Writing plugins for Segno¶
segno.QRCode provides a plugin architecture which utilizes egg
All plugins must use the
segno.plugin.converter entry point to be recognized.
If a plugin is detected, the user may use the the plugin by calling
XXX refers to the plugin name.
The specific plugin is invoked by providing the
instance and any further arguments or keywords.
This section explains how to write a plugin which writes to
stdout and uses
X for dark modules and
_ for light modules.
import sys def write(qrcode): write = sys.stdout.write for row in qrcode.matrix: for col in row: write('X' if col else '_') write('\n')
setup( name='simple-plugin', version='1.0', license='BSD', author='John Doe', firstname.lastname@example.org', platforms=['any'], py_modules=['simple_plugin'], entry_points=""" [segno.plugin.converter] simple = simple_plugin:write """, install_requires=['segno'], )
Once installed, it’s possible to call this plugin via:
>>> import segno >>> qrcode = segno.make('Chelsea Hotel No. 2') >>> qrcode.to_simple() XXXXXXX_XXXX_XX_X_XXXXXXX X_____X___________X_____X X_XXX_X_XX__XXX___X_XXX_X X_XXX_X__X_XXX_X__X_XXX_X X_XXX_X__XX_XX__X_X_XXX_X X_____X_X__XXX__X_X_____X XXXXXXX_X_X_X_X_X_XXXXXXX __________X_X__XX________ X_X___XX__XXXXX_X__X__X_X _XX__X_XXXXXX__XX_XX_X__X _X____X____X_XXXX__XX_X_X _XX__X_XX_XXX__XXXX_XX___ __X_XXXX_XXX_XX_X_XXXX_X_ _____X_X_X___X__XXXX_XX_X XXXXX_X_X_XX___XX_XXXXX_X ____XX__XXX__X_______X_XX XX_X__X__XXXXX_XXXXXX__XX ________X_X_X___X___X____ XXXXXXX_X___XXX_X_X_X___X X_____X__X_XX_X_X___XX_XX X_XXX_X___X__XXXXXXXXX_XX X_XXX_X______XX__X__XX_X_ X_XXX_X_XXXX_____X_XX_XXX X_____X___X__X__XX_X_X___ XXXXXXX_XXXXXX__X_XXXX__X