Added Github action for generating the dependency graph

.github/workflows/dependency_graph.sh

@@ -0,0 +1,32 @@
+#!/bin/bash
+
+# Create graph dot file
+echo "digraph {" > dependency_graph.dot
+
+# Loop over files in current directory starting with two or more numbers and ending in .md
+for file in [0-9][0-9]*.md; do
+  # Check if file exists
+  if [ -e "$file" ]; then
+
+    current_nip=$(echo $file | grep -o "^[0-9]\+")
+
+    # Add NIP label for node
+    title=$(echo "$(head -n 1 "$file"): $(sed '4q;d' "$file" | sed 's/"/\\"/g' | sed 's/\`//g')")
+    echo -e "\t${current_nip} [label=\"${title}\"]" >> dependency_graph.dot
+
+    # Extract NIP dependencies
+    depends=$(grep -o "depends:[0-9]\+" "$file" | grep -o "[0-9]\+")
+    if [ -n "$depends" ]; then
+      # Add graph dependency edge
+      for dep_nip in $depends; do
+        echo -e "\t${current_nip}->${dep_nip}" >> dependency_graph.dot
+      done
+    fi
+  fi
+done
+
+# Close graph file
+echo -n "}" >> dependency_graph.dot
+
+# Generate dependency graph
+dot -Tsvg dependency_graph.dot > dependency_graph.svg

.github/workflows/dependency_graph.yaml

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+# This is a basic workflow to help you get started with GitHub Actions
+
+name: Generate NIPs dependency graph
+
+# Controls when the action will run. Triggers the workflow on push or pull request
+# events but only for the main branch
+on:
+  push:
+    branches: [ main ]
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+
+  build-on-ubuntu:
+    # The type of runner that the job will run on
+    runs-on: ubuntu-latest
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+
+      - name: step 1 - Checkout the main GitHub branch
+        uses: actions/checkout@v2
+
+      - name: Step 2 - Install Graphviz
+        run: echo "TODO"
+        # sh ./.github/workflows/dependency_graph.sh
+
+      - name: Step 3 - Generate dependency graph svg
+        run: sh ./.github/workflows/dependency_graph.sh
+
+      - name: Step 4 - Do something with image
+        run: dot -Tsvg dependency_graph.dot > dependency_graph.svg