Add mustache templating

Added mustache templating engine to be able to provide custom
formatting strings.

tests/test_annotation.py

@@ -1,7 +1,51 @@
+import pytest
 from papis_extract.annotation_data import Annotation
 
 
-def test_matches_colorname_exact():
-    sut = Annotation("testfile", colors={"stroke": (1.0, 0.0, 0.0)})
+@pytest.mark.parametrize(
+    "fmt_string,expected",
+    [
+        ("{{quote}}", "I am the text value"),
+        (
+            "> {{quote}}\n{{#note}}Note: {{note}}{{/note}}",
+            "> I am the text value\nNote: Whereas I represent the note",
+        ),
+        (
+            "{{#note}}Note: {{note}}{{/note}}{{#page}}, p. {{page}}{{/page}}",
+            "Note: Whereas I represent the note",
+        ),
+    ],
+)
+def test_formatting(fmt_string, expected):
+    sut = Annotation(
+        "myfile",
+        text="I am the text value",
+        content="Whereas I represent the note",
+    )
+
+    assert sut.format(fmt_string) == expected
+
+def test_colorname_matches_exact():
+    sut = Annotation(
+        "testfile", colors={"stroke": (1.0,0.0,0.0)}, minimum_similarity_color=1.0
+    )
+    c_name = sut.colorname
+    assert c_name == "red"
+
+# TODO inject closeness value instead of relying on default
+@pytest.mark.parametrize(
+    "color_value",
+    [
+        (1.0, 0.0, 0.0),
+        (0.9, 0.0, 0.0),
+        (0.8, 0.0, 0.0),
+        (0.7, 0.0, 0.0),
+        (0.51, 0.0, 0.0),
+    ],
+)
+def test_matches_inexact_colorname(color_value):
+    sut = Annotation(
+        "testfile", colors={"stroke": color_value}, minimum_similarity_color=0.833
+    )
     c_name = sut.colorname
     assert c_name == "red"