add action to convert markdown posts to gempost

.github/actions/markdown2gempost/Dockerfile

@@ -0,0 +1,23 @@
+FROM golang:1.22 AS go-builder
+
+WORKDIR /app
+
+RUN git clone https://github.com/jbowdre/md2gmi.git
+
+WORKDIR /app/md2gmi
+
+RUN go mod download && CGO_ENABLED=0 GOOS=linux go build -o /md2gmi
+
+FROM ubuntu:22.04 AS release
+
+RUN DEBIAN_FRONTEND=noninteractive apt-get update \
+  && DEBIAN_FRONTEND=noninteractive apt-get install --no-install-recommends -y uuid-runtime=2.37.2-4ubuntu3.4 \
+  && rm -rf /var/lib/apt/lists/*
+
+COPY --from=go-builder /md2gmi /usr/local/bin/md2gmi
+COPY convert-dir.sh /usr/local/bin/convert-dir.sh
+RUN chmod +x /usr/local/bin/convert-dir.sh
+
+WORKDIR /github/workspace
+
+ENTRYPOINT ["/usr/local/bin/convert-dir.sh"]

.github/actions/markdown2gempost/action.yml

@@ -0,0 +1,15 @@
+name: 'Markdown to Gempost'
+description: 'Convert Markdown posts to Gemini posts with YAML sidecars for use with Gempost'
+inputs:
+  input-dir:
+    description: 'The directory containing markdown files'
+    required: true
+  output-dir:
+    description: 'The directory to write gemini files to'
+    required: true
+runs:
+  using: 'docker'
+  image: 'Dockerfile'
+  args:
+    - ${{ inputs.input-dir }}
+    - ${{ inputs.output-dir }}

.github/actions/markdown2gempost/convert-dir.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+
+input_dir="$1"
+output_dir="$2"
+
+# Iterate over .md files in input directory
+for file in "$input_dir"/*.md; do
+  file=$(basename "$file")
+  echo "Processing file: $file"
+
+  # Extract frontmatter and dump it to YAML file
+  echo "id: \"urn:uuid:$(uuidgen)\"" > "$output_dir/${file%.md}.yaml"
+  awk '/^---$/{if(seen){exit}else{seen=1;next}} seen' "$input_dir/$file" >> "$output_dir/${file%.md}.yaml"
+  echo "Wrote frontmatter to file: $output_dir/${file%.md}.yaml"
+
+  # Remove HTML tags, including those which may span multiple lines
+  if awk -v RS='^$' -v ORS='' '{gsub(/<[^>]*>/, ""); print}' "$input_dir/$file" > "$input_dir/tmp.md"; then
+    mv "$input_dir/tmp.md" "$input_dir/$file"
+  fi
+
+  # Convert Markdown to GMI
+  /usr/local/bin/md2gmi -i "$input_dir/$file" -o "$output_dir/${file%.md}.gmi"
+  echo "Wrote file: $output_dir/${file%.md}.gmi"
+done

.github/workflows/markdown2gempost.yml

@@ -0,0 +1,32 @@
+on:
+  workflow_dispatch:
+  push:
+    branches:
+      - main
+    paths:
+      - 'markdown/**'
+
+concurrency:
+  group: md2gmi
+  cancel-in-progress: true
+
+defaults:
+  run:
+    shell: bash
+
+jobs:
+  md2gmi:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - uses: actions/checkout@v4
+      - uses: ./.github/actions/markdown2gempost
+        with:
+          input-dir: 'markdown'
+          output-dir: 'gemlog'
+      - uses: stefanzweifel/git-auto-commit-action@v5
+        with:
+          commit_message: 'convert Markdown post to Gempost'
+          file_pattern: 'gemlog/*.gmi gemlog/*.yaml'
+