Add: Script to export plantuml diagrams to pngs

scripts/export-plantuml-to-png.sh

@@ -0,0 +1,66 @@
+#!/bin/bash
+
+# Check for plantuml installation
+PLANTUML_PATH=""
+check_plantuml_installed() {
+  if command -v plantuml &>/dev/null; then
+    PLANTUML_PATH=$(command -v plantuml)
+    return 0 # plantuml via PATH
+  else
+    return 1 # not found
+  fi
+}
+
+if ! check_plantuml_installed; then
+  echo "Error: 'plantuml' was not found. Make sure, that plantuml is installed."
+  echo "https://plantuml.com/starting"
+  exit 1
+else
+  echo "PlantUML installation found at: $PLANTUML_PATH"
+fi
+
+# Compare source (.puml document) and exported file png on mtime
+needs_export() {
+  local puml_file="$1"
+  local png_file="$2"
+
+  # If no file found, export
+  if [[ ! -f "$png_file" ]]; then
+    return 0
+  fi
+
+  if [[ "$puml_file" -nt "$png_file" ]]; then
+    return 0
+  else
+    return 1
+  fi
+}
+
+# If (re-)export is necessary export with plantuml cli
+export_file() {
+  local puml_file="$1"
+  local png_file="${puml_file%.puml}.png"
+
+  if needs_export "$puml_file" "$png_file"; then
+    echo "↻ Exporting: $puml_file"
+    "$PLANTUML_PATH" -tpng "$puml_file"
+  else
+    echo "✓ Up-to-date: $puml_file"
+  fi
+}
+
+# Iterate over all .puml files
+main() {
+  # Source - https://stackoverflow.com/a/9612232
+  # Posted by Kevin, modified by community. See post 'Timeline' for change history
+  # Retrieved 2026-03-09, License - CC BY-SA 4.0
+  find . -name '*.puml' -print0 | 
+    while IFS= read -r -d '' line; do 
+        export_file "$line"
+    done
+
+  echo "✓ Exported all files"
+}
+
+# Start script at entry point
+main