Merge remote-tracking branch 'origin/development' into capabilities

CHANGELOG.rst

@@ -1,6 +1,21 @@
 *********
 Changelog
 *********
+2016-08-26 - Version 2.2.0 - "Fate Amenable To Change"
+------------------------------------------------------
+
+changes
+^^^^^^^
+- fix improper API-use in qrcode()
+- change setup.py shebang to make it compatible with virtualenvs.
+- add constants for sheet mode and colors
+- support changing the linespacing
+
+contributors
+^^^^^^^^^^^^
+- Michael Elsdörfer
+- Patrick Kanzler
+
 2016-08-10 - Version 2.1.3 - "Ethics Gradient"
 ----------------------------------------------
 

README.rst

@@ -54,14 +54,14 @@ The basic usage is:
 
 .. code:: python
 
-    from escpos import *
+    from escpos.printer import Usb
 
     """ Seiko Epson Corp. Receipt Printer M129 Definitions (EPSON TM-T88IV) """
-    Epson = escpos.Escpos(0x04b8,0x0202,0)
+    p = Usb(0x04b8,0x0202,0)
-    Epson.text("Hello World\n")
+    p.text("Hello World\n")
-    Epson.image("logo.gif")
+    p.image("logo.gif")
-    Epson.barcode('1324354657687','EAN13',64,2,'','')
+    p.barcode('1324354657687','EAN13',64,2,'','')
-    Epson.cut()
+    p.cut()
 
 The full project-documentation is available on `Read the Docs <https://python-escpos.readthedocs.io>`_.
 

setup.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/env python
 
 import os
 import sys

src/escpos/constants.py

@@ -55,11 +55,18 @@ _CUT_PAPER = lambda m: GS + b'V' + m
 PAPER_FULL_CUT = _CUT_PAPER(b'\x00')  # Full cut paper
 PAPER_PART_CUT = _CUT_PAPER(b'\x01')  # Partial cut paper
 
+# Beep
+BEEP = b'\x07'
+
 # Panel buttons (e.g. the FEED button)
 _PANEL_BUTTON = lambda n: ESC + b'c5' + six.int2byte(n)
 PANEL_BUTTON_ON = _PANEL_BUTTON(0)  # enable all panel buttons
 PANEL_BUTTON_OFF = _PANEL_BUTTON(1)  # disable all panel buttons
 
+# Sheet modes
+SHEET_SLIP_MODE = ESC + b'\x63\x30\x04'  # slip paper
+SHEET_ROLL_MODE = ESC + b'\x63\x30\x01'  # paper roll
+
 # Text format
 # TODO: Acquire the "ESC/POS Application Programming Guide for Paper Roll
 #       Printers" and tidy up this stuff too.
@@ -104,6 +111,18 @@ SET_FONT = lambda n: ESC + b'\x4d' + n
 TXT_FONT_A     = SET_FONT(b'\x00')  # Font type A
 TXT_FONT_B     = SET_FONT(b'\x01')  # Font type B
 
+# Text colors
+TXT_COLOR_BLACK = ESC + b'\x72\x00'  # Default Color
+TXT_COLOR_RED = ESC + b'\x72\x01'    # Alternative Color (Usually Red)
+
+# Spacing
+LINESPACING_RESET = ESC + b'2'
+LINESPACING_FUNCS = {
+  60: ESC + b'A',  # line_spacing/60 of an inch, 0 <= line_spacing <= 85
+  360: ESC + b'+', # line_spacing/360 of an inch, 0 <= line_spacing <= 255
+  180: ESC + b'3', # line_spacing/180 of an inch, 0 <= line_spacing <= 255
+}
+
 # Char code table
 CHARCODE_PC437  = ESC + b'\x74\x00'  # USA: Standard Europe
 CHARCODE_JIS    = ESC + b'\x74\x01'  # Japanese Katakana

src/escpos/escpos.py

@@ -585,6 +585,35 @@ class Escpos(object):
         else:
             self._raw(TXT_INVERT_OFF)
 
+    def line_spacing(self, spacing=None, divisor=180):
+        """ Set line character spacing.
+
+        If no spacing is given, we reset it to the default.
+
+        There are different commands for setting the line spacing, using
+        a different denominator:
+
+        '+'' line_spacing/360 of an inch, 0 <= line_spacing <= 255
+        '3' line_spacing/180 of an inch, 0 <= line_spacing <= 255
+        'A' line_spacing/60 of an inch, 0 <= line_spacing <= 85
+
+        Some printers may not support all of them. The most commonly
+        available command (using a divisor of 180) is chosen.
+        """
+        if spacing is None:
+            self._raw(LINESPACING_RESET)
+            return
+
+        if divisor not in LINESPACING_FUNCS:
+            raise ValueError("divisor must be either 360, 180 or 60")
+        if (divisor in [360, 180] \
+                and (not(0 <= spacing <= 255))):
+            raise ValueError("spacing must be a int between 0 and 255 when divisor is 360 or 180")
+        if divisor == 60 and (not(0 <= spacing <= 85)):
+            raise ValueError("spacing must be a int between 0 and 85 when divisor is 60")
+
+        self._raw(LINESPACING_FUNCS[divisor] + six.int2byte(spacing))
+
     def cut(self, mode=''):
         """ Cut paper.
 

test/test_functions.py

@@ -0,0 +1,26 @@
+from nose.tools import assert_raises
+from escpos.printer import Dummy
+
+
+def test_line_spacing_code_gen():
+    printer = Dummy()
+    printer.line_spacing(10)
+    assert printer.output == b'\x1b3\n'
+
+
+def test_line_spacing_rest():
+    printer = Dummy()
+    printer.line_spacing()
+    assert printer.output == b'\x1b2'
+
+
+def test_line_spacing_error_handling():
+    printer = Dummy()
+    with assert_raises(ValueError):
+      printer.line_spacing(99, divisor=44)
+    with assert_raises(ValueError):
+      printer.line_spacing(divisor=80, spacing=86)
+    with assert_raises(ValueError):
+      printer.line_spacing(divisor=360, spacing=256)
+    with assert_raises(ValueError):
+      printer.line_spacing(divisor=180, spacing=256)