Add display format option to config file. (#1050)

* Add display format option to config file.
* Add tests.
* Fix `black` error.
* Change nested if to top level.

features/data/configs/format_md.yaml

@@ -0,0 +1,19 @@
+colors:
+  body: none
+  date: none
+  tags: none
+  title: none
+default_hour: 9
+default_minute: 0
+display_format: markdown
+editor: ''
+encrypt: false
+highlight: true
+indent_character: '|'
+journals:
+  default: features/journals/simple.journal
+linewrap: 80
+tagsymbols: '@'
+template: false
+timeformat: '%Y-%m-%d %H:%M'
+version: v2.4.5

features/data/configs/format_text.yaml

@@ -0,0 +1,19 @@
+colors:
+  body: none
+  date: none
+  tags: none
+  title: none
+default_hour: 9
+default_minute: 0
+display_format: text
+editor: ''
+encrypt: false
+highlight: true
+indent_character: '|'
+journals:
+  default: features/journals/simple.journal
+linewrap: 80
+tagsymbols: '@'
+template: false
+timeformat: '%Y-%m-%d %H:%M'
+version: v2.4.5

features/format.feature

@@ -512,3 +512,26 @@ Feature: Custom formats
         | basic_encrypted |
         | basic_folder    |
         | basic_dayone    |
+
+    Scenario: Markdown Support from config file
+        Given we use the config "format_md.yaml"
+        When we run "jrnl -n 1"
+        Then the output should be
+            """
+            # 2013
+
+            ## June
+
+            ### 2013-06-10 15:40 Life is good.
+
+            But I'm better.
+            """
+
+    Scenario: Text Formatter from config file
+        Given we use the config "format_text.yaml"
+        When we run "jrnl -n 1"
+        Then the output should be
+            """
+            [2013-06-10 15:40] Life is good.
+            But I'm better.
+            """