implement font chooser

2 files changed, 13 insertions, 1 deletions

diff --git a/lib/lettering/__init__.py b/lib/lettering/__init__.py
index c6201223..5d20d683 100644
--- a/lib/lettering/__init__.py
+++ b/lib/lettering/__init__.py
@@ -1 +1 @@
-from font import Font
\ No newline at end of file
+from font import Font, FontError
\ No newline at end of file
diff --git a/lib/lettering/font.py b/lib/lettering/font.py
index 28807cd6..6f749d28 100644
--- a/lib/lettering/font.py
+++ b/lib/lettering/font.py
@@ -7,6 +7,7 @@ import os
 import inkex
 
 from ..elements import nodes_to_elements
+from ..exceptions import InkstitchException
 from ..i18n import _
 from ..stitches.auto_satin import auto_satin
 from ..svg import PIXELS_PER_MM
@@ -15,6 +16,10 @@ from ..utils import Point
 from .font_variant import FontVariant
 
 
+class FontError(InkstitchException):
+    pass
+
+
 def font_metadata(name, default=None, multiplier=None):
     def getter(self):
         value = self.metadata.get(name, default)
@@ -47,6 +52,9 @@ class Font(object):
         self._load_license()
         self._load_variants()
 
+        if self.variants.get(self.default_variant) is None:
+            raise FontError("font not found or has no default variant")
+
     def _load_metadata(self):
         try:
             with open(os.path.join(self.path, "font.json")) as metadata_file:
@@ -81,6 +89,10 @@ class Font(object):
     kerning_pairs = font_metadata('kerning_pairs', {})
     auto_satin = font_metadata('auto_satin', True)
 
+    @property
+    def id(self):
+        return os.path.basename(self.path)
+
     def render_text(self, text, destination_group, variant=None, back_and_forth=True, trim=False):
         """Render text into an SVG group element."""