1 files changed, 76 insertions, 0 deletions
diff --git a/lib/extensions/lettering_generate_json.py b/lib/extensions/lettering_generate_json.py
new file mode 100644
index 00000000..9b44c367
--- /dev/null
+++ b/lib/extensions/lettering_generate_json.py
@@ -0,0 +1,76 @@
+import json
+import os
+import sys
+
+from inkex import Boolean
+
+from ..i18n import _
+from ..lettering.kerning import FontKerning
+from .base import InkstitchExtension
+
+
+class LetteringGenerateJson(InkstitchExtension):
+    '''
+    This extension helps font creators to generate the json file for the lettering tool
+    '''
+    def __init__(self, *args, **kwargs):
+        InkstitchExtension.__init__(self, *args, **kwargs)
+        self.arg_parser.add_argument("-n", "--font-name", type=str, default="Font", dest="font_name")
+        self.arg_parser.add_argument("-d", "--font-description", type=str, default="Description", dest="font_description")
+        self.arg_parser.add_argument("-s", "--auto-satin", type=Boolean, default="true", dest="auto_satin")
+        self.arg_parser.add_argument("-r", "--reversible", type=Boolean, default="true", dest="reversible")
+        self.arg_parser.add_argument("-g", "--default-glyph", type=str, default="", dest="default_glyph")
+        self.arg_parser.add_argument("-i", "--min-scale", type=float, default=1, dest="min_scale")
+        self.arg_parser.add_argument("-a", "--max-scale", type=float, default=1, dest="max_scale")
+        self.arg_parser.add_argument("-l", "--leading", type=int, default=0, dest="leading")
+        self.arg_parser.add_argument("-p", "--font-file", type=str, default="", dest="path")
+
+    def effect(self):
+        # file paths
+        path = self.options.path
+        if not os.path.isfile(path):
+            print(_("Please specify a font file."), file=sys.stderr)
+            return
+        output_path = os.path.join(os.path.dirname(path), 'font.json')
+
+        # kerning
+        kerning = FontKerning(path)
+
+        horiz_adv_x = kerning.horiz_adv_x()
+        hkern = kerning.hkern()
+        word_spacing = kerning.word_spacing()
+        letter_spacing = kerning.letter_spacing()
+        units_per_em = kerning.units_per_em()
+        # missing_glyph_spacing = kerning.missing_glyph_spacing()
+
+        # if letter spacing returns 0, it hasn't been specified in the font file
+        # Ink/Stitch will calculate the width of each letter automatically
+        if letter_spacing == 0:
+            letter_spacing = None
+
+        # if leading (line height) is set to 0, the font author wants Ink/Stitch to use units_per_em
+        # if units_per_em is not defined in the font file a default value will be returned
+        if self.options.leading == 0:
+            leading = units_per_em
+        else:
+            leading = self.options.leading
+
+        # collect data
+        data = {'name': self.options.font_name,
+                'description': self.options.font_description,
+                'leading': leading,
+                'auto_satin': self.options.auto_satin,
+                'reversible': self.options.reversible,
+                'default_glyph': self.options.default_glyph,
+                'min_scale': self.options.min_scale,
+                'max_scale': self.options.max_scale,
+                'horiz_adv_x_default': letter_spacing,
+                'horiz_adv_x_space': word_spacing,
+                'units_per_em': units_per_em,
+                'horiz_adv_x': horiz_adv_x,
+                'kerning_pairs': hkern
+                }
+
+        # write data to font.json into the same directory as the font file
+        with open(output_path, 'w', encoding="utf8") as font_data:
+            json.dump(data, font_data, indent=4, ensure_ascii=False)