add theme parser tool (python)

```
cd tools
python
>>> import themes
>>> theme = themes.parse_theme('../themes/orca.svg')
assert theme.background == '#000000'
assert theme.f_high == '#ffffff'
assert theme.f_med == '#777777'
assert theme.f_low == '#444444'
assert theme.f_inv == '#000000'
assert theme.b_high == '#dddddd'
assert theme.b_med == '#72dec2'
assert theme.b_low == '#222222'
assert theme.b_inv == '#ffb545'
```

1 files changed, 34 insertions, 0 deletions

diff --git a/tools/themes.py b/tools/themes.py
new file mode 100644
index 0000000..d516727
--- /dev/null
+++ b/tools/themes.py
@@ -0,0 +1,34 @@
+"""
+Nine colors should be more than enough for any interface.
+"""
+import xml.sax
+
+class ThemeHandler(xml.sax.ContentHandler):
+    def __init__(self):
+        self.background = None
+        self.f_high = None
+        self.f_med = None
+        self.f_low = None
+        self.f_inv = None
+        self.b_high = None
+        self.b_med = None
+        self.b_low = None
+        self.b_inv = None
+
+    def parseColor(self, attrs):
+        data = {k: v for k, v in attrs.items()}
+        if data.get('id') and data.get('fill'):
+            setattr(self, data['id'], data['fill'])
+
+    def startElement(self, name, attrs):
+        if name in ('circle', 'rect'):
+            self.parseColor(attrs)
+
+
+def parse_theme(path):
+    theme = ThemeHandler()
+    parser = xml.sax.make_parser()
+    parser.setContentHandler(theme)
+    with open(path, 'r') as fd:
+        parser.parse(fd)
+    return theme