Repository: timvink/mkdocs-git-revision-date-localized-plugin

Issue:
Option to set a own date format separate from the locale
It is surprising that there isn't a setting to set your own date format to use.

The only current way is to use the `locale` option which has unwanted side effects such as altering the displayed name of the month.

The reason why there should be such an option is the simple fact, that not everyone is actually using the same format for a date commonly used in that language.

As an example am I using English as my site's primary language, while using the german date format (`01. January 2022`) over the English one (`January 01, 2022`).
This causes an issue where the plugin is using the English format while I would like to use the german one instead. The issue here is that changing the locale to `de` would change `January` to `Januar` which is in conflict with my site's main language.

I would really appreciate it if such a setting could be added.

Comments:

Patch:
diff --git a/docs/available-variables.md b/docs/available-variables.md
index 168bbb0..6843a92 100644
--- a/docs/available-variables.md
+++ b/docs/available-variables.md
@@ -32,11 +32,13 @@ To allow for more flexibility when overriding a theme there are also variables f
 - `page.meta.git_revision_date_localized_raw_iso_date`
 - `page.meta.git_revision_date_localized_raw_iso_datetime`
 - `page.meta.git_revision_date_localized_raw_timeago`
+- `page.meta.git_revision_date_localized_raw_custom`
 - `page.meta.git_site_revision_date_localized_raw_datetime`
 - `page.meta.git_site_revision_date_localized_raw_iso_date`
 - `page.meta.git_site_revision_date_localized_raw_date`
 - `page.meta.git_site_revision_date_localized_raw_iso_datetime`
 - `page.meta.git_site_revision_date_localized_raw_timeago`
+- `page.meta.git_site_revision_date_localized_raw_custom`
 
 And if you've enabled creation date in the config:
 
@@ -45,6 +47,7 @@ And if you've enabled creation date in the config:
 - `page.meta.git_creation_date_localized_raw_iso_date`
 - `page.meta.git_creation_date_localized_raw_iso_datetime`
 - `page.meta.git_creation_date_localized_raw_timeago`
+- `page.meta.git_creation_date_localized_raw_custom`
 
 !!! warning "timeago.js dependency"
 
diff --git a/docs/options.md b/docs/options.md
index 2f87302..666ae87 100644
--- a/docs/options.md
+++ b/docs/options.md
@@ -8,6 +8,7 @@ You can customize the plugin by setting options in `mkdocs.yml`. For example:
   plugins:
     - git-revision-date-localized:
         type: timeago
+        custom_format: "%d. %B %Y"
         timezone: Europe/Amsterdam
         locale: en
         fallback_to_build_date: false
@@ -19,7 +20,7 @@ You can customize the plugin by setting options in `mkdocs.yml`. For example:
 
 ## `type`
 
-Default is `date`. The format of the date to be displayed. Valid values are `date`, `datetime`, `iso_date`, `iso_datetime` and `timeago`. Example outputs:
+Default is `date`. The format of the date to be displayed. Valid values are `date`, `datetime`, `iso_date`, `iso_datetime`, `timeago` and `custom`. Example outputs:
 
 ```yaml
 November 28, 2019           # type: date (default)
@@ -27,8 +28,13 @@ November 28, 2019 13:57:28  # type: datetime
 2019-11-28                  # type: iso_date
 2019-11-28 13:57:26         # type: iso_datetime
 20 hours ago                # type: timeago
+28. November 2019           # type: custom
 ```
 
+## `custom_format`
+
+Default is `%d. %B %Y`. The date format used when `type: custom`. Passed to python's `strftime`, see the [cheatsheat](https://strftime.org/) for details.
+
 ## `timezone`
 
 Default is `UTC`. Specify a time zone database name ([reference](https://en.wikipedia.org/wiki/List_of_tz_database_time_zones)). This option is especially relevant when using `type: datetime` and `type: iso_datetime`. Note that when using [timeago](http://timeago.yarp.com/) (with `type: timeago`) any difference in time zones between server and client will be handled automatically.
diff --git a/mkdocs_git_revision_date_localized_plugin/plugin.py b/mkdocs_git_revision_date_localized_plugin/plugin.py
index 9a3bdb3..9d609fc 100644
--- a/mkdocs_git_revision_date_localized_plugin/plugin.py
+++ b/mkdocs_git_revision_date_localized_plugin/plugin.py
@@ -37,6 +37,7 @@ class GitRevisionDateLocalizedPlugin(BasePlugin):
         ("fallback_to_build_date", config_options.Type(bool, default=False)),
         ("locale", config_options.Type(str, default=None)),
         ("type", config_options.Type(str, default="date")),
+        ("custom_format", config_options.Type(str, default="%d. %B %Y")),
         ("timezone", config_options.Type(str, default="UTC")),
         ("exclude", config_options.Type(list, default=[])),
         ("enable_creation_date", config_options.Type(bool, default=False)),
@@ -61,7 +62,7 @@ class GitRevisionDateLocalizedPlugin(BasePlugin):
         if not self.config.get('enabled'):
             return config
         
-        assert self.config['type'] in ["date","datetime","iso_date","iso_datetime","timeago"]
+        assert self.config['type'] in ["date","datetime","iso_date","iso_datetime","timeago","custom"]
 
         self.util = Util(config=self.config)
 
@@ -195,7 +196,6 @@ class GitRevisionDateLocalizedPlugin(BasePlugin):
         assert len(locale) == 2, "locale must be a 2 letter code, see https://en.wikipedia.org/wiki/List_of_ISO_639-1_codes"
         
 
-
         # Retrieve git commit timestamp
         last_revision_timestamp = self.util.get_git_commit_timestamp(
                 path=page.file.abs_src_path,
diff --git a/mkdocs_git_revision_date_localized_plugin/util.py b/mkdocs_git_revision_date_localized_plugin/util.py
index 8fbf847..c93a5bd 100644
--- a/mkdocs_git_revision_date_localized_plugin/util.py
+++ b/mkdocs_git_revision_date_localized_plugin/util.py
@@ -46,7 +46,7 @@ class Util:
 
     @staticmethod
     def _date_formats(
-        unix_timestamp: float, locale: str = "en", time_zone: str = "UTC"
+        unix_timestamp: float, locale: str = "en", time_zone: str = "UTC", custom_format: str = "%d. %B %Y"
     ) -> Dict[str, Any]:
         """
         Calculate different date formats / types.
@@ -55,6 +55,7 @@ class Util:
             unix_timestamp (float): A timestamp in seconds since 1970.
             locale (str): Locale code of language to use. Defaults to 'en'.
             time_zone (str): Timezone database name (https://en.wikipedia.org/wiki/List_of_tz_database_time_zones).
+            custom_format (str): strftime format specifier for the 'custom' type
 
         Returns:
             dict: Different date formats.
@@ -77,8 +78,8 @@ class Util:
             ),
             "iso_date": loc_revision_date.strftime("%Y-%m-%d"),
             "iso_datetime": loc_revision_date.strftime("%Y-%m-%d %H:%M:%S"),
-            "timeago": '<span class="timeago" datetime="%s" locale="%s"></span>'
-            % (loc_revision_date.isoformat(), locale),
+            "timeago": '<span class="timeago" datetime="%s" locale="%s"></span>' % (loc_revision_date.isoformat(), locale),
+            "custom": loc_revision_date.strftime(custom_format),
         }
 
     def get_git_commit_timestamp(
@@ -195,7 +196,8 @@ class Util:
         date_formats = self._date_formats(
             unix_timestamp=commit_timestamp, 
             time_zone=self.config.get("timezone"),
-            locale=locale
+            locale=locale,
+            custom_format=self.config.get('custom_format')
         )
         if add_spans:
             date_formats = self.add_spans(date_formats)


Test patch:
diff --git a/tests/fixtures/basic_project/mkdocs_custom_type.yml b/tests/fixtures/basic_project/mkdocs_custom_type.yml
new file mode 100644
index 0000000..7b57d11
--- /dev/null
+++ b/tests/fixtures/basic_project/mkdocs_custom_type.yml
@@ -0,0 +1,8 @@
+site_name: test gitrevisiondatelocalized_plugin
+use_directory_urls: true
+
+plugins:
+    - search
+    - git-revision-date-localized:
+        type: custom
+        custom_format: "%Y"
\ No newline at end of file
diff --git a/tests/test_builds.py b/tests/test_builds.py
index 320f1ac..fe338ff 100644
--- a/tests/test_builds.py
+++ b/tests/test_builds.py
@@ -300,6 +300,7 @@ MKDOCS_FILES = [
     'basic_project/mkdocs_theme_timeago_instant.yml',
     'basic_project/mkdocs_exclude.yml',
     'basic_project/mkdocs_meta.yml',
+    'basic_project/mkdocs_custom_type.yml',
     # 'i18n/mkdocs.yml'
 ]
 
@@ -322,6 +323,7 @@ def test_date_formats():
         "iso_date": "2020-02-22",
         "iso_datetime": "2020-02-22 18:52:09",
         "timeago": '<span class="timeago" datetime="2020-02-22T18:52:09+00:00" locale="en"></span>',
+        "custom": '22. February 2020',
     }
 
 
@@ -363,9 +365,12 @@ def test_tags_are_replaced(tmp_path, mkdocs_file):
     # Assert {{ git_revision_date_localized }} is replaced
     date_formats_revision_date = Util()._date_formats(1642911026, 
         locale=plugin_config.get("locale"),
-        time_zone=plugin_config.get("timezone"))
+        time_zone=plugin_config.get("timezone"),
+        custom_format=plugin_config.get("custom_format")
+    )
     for k, v in date_formats_revision_date.items():
         assert v is not None
+    
     date = date_formats_revision_date.get(plugin_config.get('type'))
     assert re.search(rf"{date}\<\/span.+", contents)
 
@@ -373,7 +378,9 @@ def test_tags_are_replaced(tmp_path, mkdocs_file):
     # Assert {{ git_site_revision_date_localized }} is replaced
     date_formats_revision_date = Util()._date_formats(1643911026, 
         locale=plugin_config.get("locale"),
-        time_zone=plugin_config.get("timezone"))
+        time_zone=plugin_config.get("timezone"),
+        custom_format=plugin_config.get("custom_format")
+    )
     for k, v in date_formats_revision_date.items():
         assert v is not None
     date = date_formats_revision_date.get(plugin_config.get('type')) 
@@ -384,7 +391,9 @@ def test_tags_are_replaced(tmp_path, mkdocs_file):
         # The creation of page_with_tag.md was set in setup_commit_history to 1500854705 ( Mon Jul 24 2017 00:05:05 GMT+0000 )
         date_formats_revision_date = Util()._date_formats(1500854705, 
             locale=plugin_config.get("locale"),
-            time_zone=plugin_config.get("timezone"))
+            time_zone=plugin_config.get("timezone"),
+            custom_format=plugin_config.get("custom_format")
+        )
         for k, v in date_formats_revision_date.items():
             assert v is not None
         date = date_formats_revision_date.get(plugin_config.get('type'))