text: rewrite embedding to use set_shape_renderer

No more arcane unicode magic!

Closes #177

Related to #170, #171, #158, #103, and #153 too.

spec/graphics/embedding_utils_spec.rb

@@ -0,0 +1,73 @@
+require 'spec_helper'
+require 'squib/graphics/embedding_utils'
+
+describe Squib::EmbeddingUtils do
+
+  context(:indices) do
+    it 'returns nothing when given nothing' do
+      expect(Squib::EmbeddingUtils.indices('just some text', [])).to eq({})
+    end
+
+    it 'returns emptiness for given keys that are not in the string' do
+      str = 'just some text'
+      keys = [':tool:']
+      expect(Squib::EmbeddingUtils.indices(str, keys)).to eq({
+        ':tool:' => []
+      })
+    end
+
+    it 'returns correctly for one key, one time' do
+      str = 'some :tool: text'
+      keys = [':tool:']
+      expect(Squib::EmbeddingUtils.indices(str, keys)).to eq({
+        ':tool:' => [5..11]
+      })
+    end
+
+    it 'handles one key, multiple times' do
+      str = 'some :tool: text :tool:'
+      keys = [':tool:']
+      expect(Squib::EmbeddingUtils.indices(str, keys)).to eq({
+        ':tool:' => [5..11, 17..23]
+      })
+    end
+
+    it 'handles one key, multiple times next to each other' do
+      str = 'some :tool::tool: text'
+      keys = [':tool:']
+      expect(Squib::EmbeddingUtils.indices(str, keys)).to eq({
+        ':tool:' => [5..11, 11..17]
+      })
+    end
+
+    it 'handles multiple keys, one time each' do
+      str = 'some :tool: heart text'
+      keys = %w(:tool: heart)
+      expect(Squib::EmbeddingUtils.indices(str, keys)).to eq({
+        ':tool:' => [5..11],
+        'heart' => [12..17]
+      })
+    end
+
+    it 'handles multiple keys, multiple times each' do
+      str = ':tool:some :tool: heart text heart tool'
+      keys = %w(:tool: heart)
+      expect(Squib::EmbeddingUtils.indices(str, keys)).to eq({
+        ':tool:' => [0..6, 11..17],
+        'heart' => [18..23, 29..34]
+      })
+    end
+
+    it 'handles multibyte properly' do
+      str = '💡 📷 :tool: heart text'
+      keys = %w(:tool: heart 💡)
+      expect(Squib::EmbeddingUtils.indices(str, keys)).to eq({
+        ':tool:' => [10..16],
+        'heart' => [17..22],
+        '💡' => [3..4]
+      })
+    end
+
+
+  end
+end