Refactor gemini builder with python

Perl was having issues with markdown's fenced blocks, so I decided to rewrite the generator script in Python.

Dockerfile.gemini

@@ -1,6 +1,8 @@
 FROM alpine:latest
 
-RUN apk add perl lowdown
 WORKDIR /app
-COPY generate_capsule.sh .
+COPY requirements.txt .
-ENTRYPOINT [ "./generate_capsule.sh" ]
+RUN apk add python3 py3-pip lowdown \
+    && python3 -m pip install -r requirements.txt --break-system-packages
+COPY generate_capsule.py .
+ENTRYPOINT [ "python3", "generate_capsule.py" ]

_config.yml

@@ -6,7 +6,8 @@ exclude:
   - Dockerfile*
   - compose.yaml
   - Makefile
-  - generate_capsule.sh
+  - generate_capsule.py
+  - requirements.txt
 
 jekyll_compose:
   default_front_matter:

generate_capsule.py

@@ -0,0 +1,83 @@
+import glob
+import os
+import subprocess
+from datetime import datetime
+
+import frontmatter
+
+if not os.path.exists("_capsule"):
+    os.makedirs("_capsule")
+
+with open("_layouts/home.gmi", mode="r", encoding="utf8") as file:
+    home_body = file.read()
+with open("_layouts/article.gmi", mode="r", encoding="utf8") as file:
+    article_body = file.read()
+with open("_includes/header.gmi", mode="r", encoding="utf8") as file:
+    header_body = file.read()
+with open("_includes/footer.gmi", mode="r", encoding="utf8") as file:
+    footer_body = file.read()
+with open("_includes/links.gmi", mode="r", encoding="utf8") as file:
+    links_body = file.read()
+
+articles = glob.glob("_posts/*.md")
+if os.getenv("GEMINI_ENV") != "production":
+    articles += glob.glob("_drafts/*.md")
+
+today = datetime.today().strftime("%Y-%m-%d")
+year = datetime.today().strftime("%Y")
+
+articles_list = []
+
+for article in articles:
+    gmi = article.replace("_posts/", "").replace("_drafts/", "").replace(".md", ".gmi")
+
+    fm = frontmatter.load(article)
+    article_title = fm.get("title")
+    article_date = fm.get("date")
+
+    links = fm.get("links", "end")
+
+    result = subprocess.run(
+        ["lowdown", "-tgemini", f"--gemini-link-{links}", article],
+        capture_output=True,
+        text=True,
+    )
+    article_content = result.stdout
+
+    if article_date is None:
+        article_date = today
+        gmi = f"{article_date}-{gmi}"
+    elif isinstance(article_date, str):
+        article_date = datetime.fromisoformat(article_date).strftime("%Y-%m-%d")
+
+    body = (
+        article_body.replace("%%header%%", header_body)
+        .replace("%%links%%", links_body)
+        .replace("%%title%%", f"{article_title}\n{article_date}\n")
+        .replace("%%body%%", article_content)
+        .replace("%%footer%%", footer_body)
+        .replace("%%year%%", year)
+    )
+
+    articles_list.append(f"=> {gmi} {article_date} {article_title}")
+    with open(f"_capsule/{gmi}", mode="w", encoding="utf8") as file:
+        file.write(body)
+
+articles_list.sort(reverse=True)
+
+result = subprocess.run(
+    ["lowdown", "-tgemini", "index.md"], capture_output=True, text=True
+)
+home_content = result.stdout
+
+body = (
+    home_body.replace("%%header%%", header_body)
+    .replace("%%links%%", links_body)
+    .replace("%%body%%", home_content)
+    .replace("%%articles%%", "\n".join(articles_list))
+    .replace("%%footer%%", footer_body)
+    .replace("%%year%%", year)
+)
+
+with open("_capsule/index.gmi", mode="w", encoding="utf8") as file:
+    file.write(body)

generate_capsule.sh

@@ -1,85 +0,0 @@
-#!/usr/bin/env sh
-
-mkdir -p _capsule
-
-articles_list=""
-
-current_year=$(date +%Y)
-header_body=$(cat _includes/header.gmi)
-footer_body=$(cat _includes/footer.gmi)
-links_body=$(cat _includes/links.gmi)
-
-for post in $(ls _posts/*.md); do
-    article_title=$(lowdown -X title $post)
-    article_date=$(lowdown -X date $post | awk '{print $1}')
-    article_body=$(lowdown -tgemini $post)
-
-    echo "Rendering post $article_title..."
-
-    gemfile=$post
-    gemfile=${gemfile/_posts/_capsule}
-    gemfile=${gemfile/.md/.gmi}
-
-    cat _layouts/article.gmi \
-        | perl -pe "s|%%header%%|${header_body}|" \
-        | perl -pe "s|%%links%%|${links_body}|" \
-        | perl -pe "s|%%title%%|${article_title}\n${article_date}\n|" \
-        | perl -pe "s|%%body%%|${article_body}|" \
-        | perl -pe "s|%%footer%%|${footer_body}|" \
-        | perl -pe "s|%%year%%|${current_year}|" \
-        > $gemfile
-
-    articles_list="$articles_list=> ${gemfile/_capsule\//} $article_date $article_title\n"
-done
-
-drafts_list=""
-
-if [ "${GEMINI_ENV}" != 'production' ]; then
-    for post in $(ls _drafts/*.md); do
-        article_title=$(lowdown -X title $post)
-        article_body=$(lowdown -tgemini $post)
-
-        echo "Rendering draft $article_title..."
-
-        gemfile=$post
-        gemfile=${gemfile/_drafts/_capsule}
-        gemfile=${gemfile/.md/.gmi}
-
-        cat _layouts/article.gmi \
-            | perl -pe "s|%%header%%|${header_body}|" \
-            | perl -pe "s|%%links%%|${links_body}|" \
-            | perl -pe "s|%%title%%|${article_title}|" \
-            | perl -pe "s|%%body%%|${article_body}|" \
-            | perl -pe "s|%%footer%%|${footer_body}|" \
-            | perl -pe "s|%%year%%|${current_year}|" \
-            > $gemfile
-
-        drafts_list="$drafts_list=> ${gemfile/_capsule\//} $article_title\n"
-    done
-fi
-
-echo "Rendering index..."
-
-index_body=$(lowdown -tgemini index.md)
-
-articles=""
-if [ ! -z "$articles_list" ]; then
-    articles="## Articles\n\n${articles_list}"
-fi
-
-drafts=""
-if [ ! -z "$drafts_list" ]; then
-    drafts="## Drafts\n\n${drafts_list}"
-fi
-
-cat _layouts/home.gmi \
-    | perl -pe "s|%%header%%|${header_body}|" \
-    | perl -pe "s|%%links%%|${links_body}|" \
-    | perl -pe "s|%%body%%|${index_body}|" \
-    | perl -pe "s|%%articles%%|${articles}|" \
-    | perl -pe "s|%%drafts%%|${drafts}|" \
-    | perl -pe "s|%%footer%%|${footer_body}|" \
-    | perl -pe "s|%%year%%|${current_year}|" \
-    > _capsule/index.gmi
-
-echo "Done"

requirements.txt

@@ -0,0 +1,5 @@
+packaging==24.2
+pyparsing==3.1.4
+python-frontmatter==1.1.0
+PyYAML==6.0.2
+setuptools==70.3.0