Add degree symbol to charmap (#158)

Fixes #157
* Updated gitignore to cover pytest cache files
* Add degree symbol to charmap
* try unicode in py27
* revert prev change
* Rework segment mapper implementation after unicode fix in luma.core
* Add @petrkr to contributors list
* Additional tests

.gitignore

@@ -42,6 +42,7 @@ htmlcov/
 .cache
 nosetests.xml
 coverage.xml
+.pytest_cache/
 
 # Translations
 *.mo

CONTRIBUTING.rst

@@ -22,3 +22,4 @@ Contributors
 * Qinkang Huang (@pokebox)
 * Shawn Woodford (@swoodford)
 * Phil Howard (@gadgetoid)
+* Petr Kracík (@petrkr)

luma/led_matrix/segment_mapper.py

@@ -6,6 +6,8 @@
     ' ': 0x00,
     '-': 0x01,
     '_': 0x08,
+    u'°': 0x63,
+    '\xb0': 0x63,
     '\'': 0x02,
     '0': 0x7e,
     '1': 0x30,
@@ -86,6 +88,9 @@ def regular(text, notfound="_"):
 
 
 def dot_muncher(text, notfound="_"):
+    if not text:
+        return
+
     undefined = _DIGITS[notfound]
     iterator = iter(text)
     last = _DIGITS.get(next(iterator), undefined)

setup.py

@@ -50,7 +50,7 @@ def find_version(*file_paths):
     url="https://github.com/rm-hull/luma.led_matrix",
     download_url="https://github.com/rm-hull/luma.led_matrix/tarball/" + version,
     packages=["luma", "luma.led_matrix"],
-    install_requires=["luma.core>=1.2.1"],
+    install_requires=["luma.core>=1.8.1"],
     setup_requires=pytest_runner,
     tests_require=test_deps,
     extras_require={

tests/test_segment_mapper.py

@@ -62,3 +62,21 @@ def test_regular_empty_buf():
     buf = mutable_string("")
     results = regular(buf)
     assert list(results) == []
+
+
+def test_degrees_string():
+    buf = mutable_string("29.12\xb0C")
+    results = dot_muncher(buf)
+    assert list(results) == [0x6d, 0x7b | 0x80, 0x30, 0x6d, 0x63, 0x4e]
+
+
+def test_degrees_unicode():
+    buf = mutable_string(u"29.12°C")
+    results = dot_muncher(buf)
+    assert list(results) == [0x6d, 0x7b | 0x80, 0x30, 0x6d, 0x63, 0x4e]
+
+
+def test_degrees_utf8():
+    buf = mutable_string(u"29.12\xb0C")
+    results = dot_muncher(buf)
+    assert list(results) == [0x6d, 0x7b | 0x80, 0x30, 0x6d, 0x63, 0x4e]