closes #21: trigger to print labels

data/triggers-available/echo.py

@@ -6,9 +6,10 @@ import sys
 import json
 
 def main():
-    print 'STDIN JSON:', json.loads(sys.stdin.read())
+    # NOTE: even if not used, ALWAYS consume sys.stdin to close the pipe.
+    print 'STDIN JSON:', repr(json.loads(sys.stdin.read()))
     print ''
-    print 'ENV:', os.environ
+    print 'ENV:', repr(os.environ)
 
 
 if __name__ == '__main__':

data/triggers-available/print_label.py

@@ -0,0 +1,72 @@
+#!/usr/bin/env python
+"""print_label.py - print a label with the name, the company and the person_id (in a barcode) of an attendee
+
+Copyright 2015 Emiliano Mattioli <oloturia AT gmail.com>
+               Davide Alberani <da@erlug.linux.it>
+               RaspiBO <info@raspibo.org>
+
+Licensed under the Apache License 2.0
+"""
+
+import os
+import sys
+import cups
+import tempfile
+from PIL import Image, ImageFont, ImageDraw
+
+LABEL_WIDTH = 13488
+LABEL_HEIGHT = 3744
+
+FONT_TEXT = 'Ubuntu-C.ttf'
+FONT_TEXT_ENCODING = 'latin-1'
+FONT_BARCODE = 'free3of9.ttf'
+
+PRINTER_NAME = None
+
+
+
+def _get_resource(filename):
+    return os.path.join(os.path.dirname(sys.argv[0]), filename)
+
+
+def build_label(w, h, barcode_text, line1, line2, font_text=FONT_TEXT, font_barcode=FONT_BARCODE):
+    barcode_text = "*" + barcode_text + "*"
+    line1 = unicode(line1, 'utf-8').encode(FONT_TEXT_ENCODING, 'ignore')
+    line2 = unicode(line2, 'utf-8').encode(FONT_TEXT_ENCODING, 'ignore')
+    fontbar = ImageFont.truetype(_get_resource(font_barcode), 1200)
+    fontnorm = ImageFont.truetype(_get_resource(font_text), 780)
+    image = Image.new('RGB', (w, h), (255, 255, 255))
+    draw = ImageDraw.Draw(image)
+    wbar, hbar = draw.textsize(barcode_text, font=fontbar)
+    wnorm1, hnorm1 = draw.textsize(line1, font=fontnorm)
+    wnorm2, hnorm2 = draw.textsize(line2, font=fontnorm)
+    draw.text(((w-wnorm1)/2, -1200+(h-hnorm1)/2), line1, (0, 0, 0), font=fontnorm)
+    draw.text(((w-wnorm2)/2, -450+(h-hnorm2)/2), line2, (0, 0, 0), font=fontnorm)
+    draw.text(((w-wbar)/2, 750+(h-hbar)/2), barcode_text, (0, 0, 0), font=fontbar)
+    tmpfile = tempfile.NamedTemporaryFile(prefix='eventman_print_label_', suffix='.png')
+    image.save(tmpfile, dpi=[600,300], format='png')
+    return tmpfile
+
+
+def print_label(label_file, name):
+    conn = cups.Connection()
+    printer = PRINTER_NAME or conn.getDefault()
+    conn.printFile(printer, label_file.name, name, {})
+
+
+def run():
+    # Always consume stdin.
+    sys.stdin.read()
+    name = ' '.join([os.environ.get('NAME') or '', os.environ.get('SURNAME') or ''])
+    company = os.environ.get('COMPANY') or ''
+    person_id = os.environ.get('PERSON_ID', '').upper()
+    label_file = build_label(LABEL_WIDTH, LABEL_HEIGHT, person_id, name, company)
+    print_label(label_file, name)
+
+
+if __name__ == '__main__':
+    try:
+        run()
+    except Exception, e:
+        sys.stderr.write('print_label.  Exception raised: %s\n' % e)
+