refactor(docs): optmst `docs` dir & `deps`

2 files changed, 96 insertions, 0 deletions

diff --git a/docs/src/plugins/blog/readtime/__init__.py b/docs/src/plugins/blog/readtime/__init__.py
new file mode 100644
index 00000000..a0c149b9
--- /dev/null
+++ b/docs/src/plugins/blog/readtime/__init__.py
@@ -0,0 +1,51 @@
+# Copyright (c) 2016-2023 Martin Donath <martin.donath@squidfunk.com>
+
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to
+# deal in the Software without restriction, including without limitation the
+# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+# sell copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+# IN THE SOFTWARE.
+
+import re
+
+from math import ceil
+
+from .parser import ReadtimeParser
+
+# -----------------------------------------------------------------------------
+# Functions
+# -----------------------------------------------------------------------------
+
+# Compute readtime - we first used the original readtime library, but the list
+# of dependencies it brings with it increased the size of the Docker image by
+# 20 MB (packed), which is an increase of 50%. For this reason, we adapt the
+# original readtime algorithm to our needs - see https://t.ly/fPZ7L
+def readtime(html: str, words_per_minute: int):
+    parser = ReadtimeParser()
+    parser.feed(html)
+    parser.close()
+
+    # Extract words from text and compute readtime in seconds
+    words = len(re.split(r"\W+", "".join(parser.text)))
+    seconds = ceil(words / words_per_minute * 60)
+
+    # Account for additional images
+    delta = 12
+    for _ in range(parser.images):
+        seconds += delta
+        if delta > 3: delta -= 1
+
+    # Return readtime in minutes
+    return ceil(seconds / 60)
diff --git a/docs/src/plugins/blog/readtime/parser.py b/docs/src/plugins/blog/readtime/parser.py
new file mode 100644
index 00000000..b91a7b30
--- /dev/null
+++ b/docs/src/plugins/blog/readtime/parser.py
@@ -0,0 +1,45 @@
+# Copyright (c) 2016-2023 Martin Donath <martin.donath@squidfunk.com>
+
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to
+# deal in the Software without restriction, including without limitation the
+# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+# sell copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+# FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+# IN THE SOFTWARE.
+
+from html.parser import HTMLParser
+
+# -----------------------------------------------------------------------------
+# Classes
+# -----------------------------------------------------------------------------
+
+# Readtime parser
+class ReadtimeParser(HTMLParser):
+
+    # Initialize parser
+    def __init__(self):
+        super().__init__(convert_charrefs = True)
+
+        # Keep track of text and images
+        self.text   = []
+        self.images = 0
+
+    # Collect images
+    def handle_starttag(self, tag, attrs):
+        if tag == "img":
+            self.images += 1
+
+    # Collect text
+    def handle_data(self, data):
+        self.text.append(data)