From 0a8e15ee3204cf50532848e4d6e9ed5a16a3ee6b Mon Sep 17 00:00:00 2001
From: devon-thyne <dthyne75@gmail.com>
Date: Thu, 29 Jan 2026 12:45:55 -0500
Subject: [PATCH 1/2] v1.0.0 - Initial Implementation

---
 .github/workflows/pre-commit.yml      |  43 ++++++
 .gitignore                            |   1 +
 .pre-commit-config.yaml               |  21 +++
 .pre-commit-hooks.yaml                |   7 +
 CHANGELOG.md                          |   8 ++
 README.md                             | 139 +++++++++++++++++++
 hooks/drawio-auto-export.sh           | 184 ++++++++++++++++++++++++++
 tests/test-multiple-pages--page-1.png | Bin 0 -> 2155 bytes
 tests/test-multiple-pages--page-2.png | Bin 0 -> 2144 bytes
 tests/test-multiple-pages.drawio      |  24 ++++
 tests/test-single-page.drawio         |  13 ++
 tests/test-single-page.png            | Bin 0 -> 1169 bytes
 12 files changed, 440 insertions(+)
 create mode 100644 .github/workflows/pre-commit.yml
 create mode 100644 .gitignore
 create mode 100644 .pre-commit-config.yaml
 create mode 100644 .pre-commit-hooks.yaml
 create mode 100644 CHANGELOG.md
 create mode 100644 README.md
 create mode 100644 hooks/drawio-auto-export.sh
 create mode 100644 tests/test-multiple-pages--page-1.png
 create mode 100644 tests/test-multiple-pages--page-2.png
 create mode 100644 tests/test-multiple-pages.drawio
 create mode 100644 tests/test-single-page.drawio
 create mode 100644 tests/test-single-page.png

diff --git a/.github/workflows/pre-commit.yml b/.github/workflows/pre-commit.yml
new file mode 100644
index 0000000..7d6ce28
--- /dev/null
+++ b/.github/workflows/pre-commit.yml
@@ -0,0 +1,43 @@
+name: pre-commit
+
+on:
+  push:
+    branches-ignore:
+      - main
+
+jobs:
+  pre-commit:
+    runs-on: ubuntu-latest
+
+    container:
+      image: python:3.11-bullseye
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Mark workspace as safe for git
+        run: |
+          export HOME=/github/home
+          git config --global --add safe.directory "$GITHUB_WORKSPACE"
+
+      - name: Install system dependencies
+        run: |
+          apt-get update
+          apt-get install -y \
+            libasound2 \
+            libatk-bridge2.0-0 \
+            libatk1.0-dev \
+            libcups2 \
+            libdbus-1-dev \
+            libgbm1 \
+            libgtk-3-0 \
+            libimage-exiftool-perl \
+            libnss3 \
+            xvfb
+
+      - name: Install pre-commit
+        run: pip3 install pre-commit
+
+      - name: Run pre-commit
+        run: pre-commit run --all-files
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..e43b0f9
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+.DS_Store
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
new file mode 100644
index 0000000..6aa9eae
--- /dev/null
+++ b/.pre-commit-config.yaml
@@ -0,0 +1,21 @@
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v5.0.0
+    hooks:
+      - id: no-commit-to-branch
+      - id: check-merge-conflict
+      - id: check-yaml
+      - id: trailing-whitespace
+      - id: check-symlinks
+      - id: end-of-file-fixer
+      - id: mixed-line-ending
+
+  - repo: local
+    hooks:
+      - id: drawio-auto-export
+        name: Draw.io Auto Export
+        description: >-
+          Automatically exports .drawio files in repository into .png whenever you commit changes
+        entry: hooks/drawio-auto-export.sh
+        language: script
+        files: \.drawio$
diff --git a/.pre-commit-hooks.yaml b/.pre-commit-hooks.yaml
new file mode 100644
index 0000000..8935fd7
--- /dev/null
+++ b/.pre-commit-hooks.yaml
@@ -0,0 +1,7 @@
+- id: drawio-auto-export
+  name: Draw.io Auto Export
+  description: >-
+    Automatically exports .drawio files in repository into .png whenever you commit changes
+  entry: hooks/drawio-auto-export.sh
+  language: script
+  files: \.drawio$
diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..1332768
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,8 @@
+# Latest Version
+1.0.0
+
+# Version History
+## Version 1.0.0 (2025-01-28) (devon-thyne)
+### Initial Version
+* Pre-commit hook that will auto-export `.drawio` files in repository to `.png` whenever you commit changes
+* Done so with a thin and simple bash script
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..4e02d16
--- /dev/null
+++ b/README.md
@@ -0,0 +1,139 @@
+pre-commit drawio auto-export
+=============================
+
+This pre-commit hook automatically exports [Draw.io](https://www.drawio.com/) (`.drawio`) files in repository into `.png` whenever you commit changes.
+
+**Table of Contents:**
+
+- [Installation](#installation)
+- [Features](#features)
+- [Requirements](#requirements)
+- [Supported Platforms](#supported-platforms)
+- [CI/CD Examples](#cicd-examples)
+   * [GitHub](#github)
+   * [Gitlab](#gitlab)
+- [Acknowledgements](#acknowledgements)
+
+## Installation
+
+Add the hook to your `.pre-commit-config.yaml`:
+
+```yaml
+repos:
+  - repo: https://github.com/devon-thyne/pre-commit-drawio-auto-export.git
+    rev: v1.0.0
+    hooks:
+      - id: drawio-auto-export
+```
+
+## Features
+
+- Automatically detects all `.drawio` files within repository
+- Exports diagram file(s) to `.png` using the draw.io CLI (AppImage for Linux, Desktop app for macOS)
+  - Exports multi-paged diagram files as multiple `.png` image(s) each suffixed with the diagram page's name
+- Fails if any files are generated net-new or modified
+- Automatically stages changes to new or modified exported files
+
+## Requirements
+
+* BASH interpreter
+* `exiftool`
+* `xvfb` (linux only)
+* `Draw.io Desktop` (macos only)
+
+## Supported Platforms
+
+### Linux
+- [xvfb](https://linux.die.net/man/1/xvfb) must be installed.
+- **Note:** the script will automatically download and cache the Draw.io AppImage if not already present.
+  - path: `~/.cache/pre-commit/drawio`
+
+### macOS
+- [Draw.io Desktop](https://github.com/jgraph/drawio-desktop/releases) must be installed in `/Applications`.
+- **Note:** exports briefly display the Draw.io icon in the Dock due to macOS constraints
+
+### Windows
+- **not supported**
+- use windows subsystem for linux
+
+## CI/CD Examples
+
+> [!TIP]
+> Suggest pre-building your own pre-commit docker image with the necessary dependencies
+
+### GitHub
+
+The following example demonstrates how to run this hook in GitHub Actions.
+Trigger conditions (e.g. push, pull_request, branches) are intentionally left to the user.
+
+```yaml
+name: pre-commit
+
+jobs:
+  pre-commit:
+    runs-on: ubuntu-latest
+
+    container:
+      image: python:3.11-bullseye
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Mark workspace as safe for git
+        run: |
+          export HOME=/github/home
+          git config --global --add safe.directory "$GITHUB_WORKSPACE"
+
+      - name: Install system dependencies
+        run: |
+          apt-get update
+          apt-get install -y \
+            libasound2 \
+            libatk-bridge2.0-0 \
+            libatk1.0-dev \
+            libcups2 \
+            libdbus-1-dev \
+            libgbm1 \
+            libgtk-3-0 \
+            libimage-exiftool-perl \
+            libnss3 \
+            xvfb
+
+      - name: Install pre-commit
+        run: pip3 install pre-commit
+
+      - name: Run pre-commit
+        run: pre-commit run --all-files
+```
+
+### Gitlab
+
+The following example demonstrates how to run this hook in GitLab CI/CD.
+Pipeline triggers and execution rules (e.g. branches, merge requests) should be defined by the user.
+
+```yaml
+pre-commit:
+  stage: pre-commit
+  image: python:3.11-bullseye
+  script:
+    - apt update
+    - |
+      apt install -y \
+        libasound2 \
+        libatk-bridge2.0-0 \
+        libatk1.0-dev \
+        libcups2 \
+        libdbus-1-dev \
+        libgbm1 \
+        libgtk-3-0 \
+        libimage-exiftool-perl \
+        libnss3 \
+        xvfb
+    - pip3 install pre-commit
+    - pre-commit run --all-files
+```
+
+## Acknowledgements
+
+This project was inspired by an early CI/CD-based Draw.io export workflow shared by a colleague. That initial work sparked the idea to formalize and extend the approach into a reusable, pre-commit–based tool with additional logic around change detection, local generation, and reproducibility.
diff --git a/hooks/drawio-auto-export.sh b/hooks/drawio-auto-export.sh
new file mode 100644
index 0000000..f1c0c61
--- /dev/null
+++ b/hooks/drawio-auto-export.sh
@@ -0,0 +1,184 @@
+#!/usr/bin/env bash
+# Synopsis: pre-commit script that exports .drawio files to `.png` whenever you commit changes
+set -euo pipefail
+
+OS="$(uname -s)"
+ARCH="$(uname -m)"
+
+FORMAT="png"
+DIAGRAMS=()
+CHANGES_DETECTED=0
+
+# Parse Arguments
+while [[ $# -gt 0 ]]; do
+  case "$1" in
+    *.drawio)
+      DIAGRAMS+=("$1")
+      shift
+      ;;
+    *)
+      echo "[ERROR]: Unknown option: $1" >&2
+      echo "Usage: $0 <file1.drawio> <file2.drawio> ..." >&2
+      exit 1
+      ;;
+  esac
+done
+
+# Check Requirements
+if command -v exiftool >/dev/null 2>&1; then
+  EXIFTOOL="$(command -v exiftool)"
+elif [ -x /usr/local/bin/exiftool ]; then
+  EXIFTOOL=/usr/local/bin/exiftool
+elif [ -x /opt/homebrew/bin/exiftool ]; then
+  EXIFTOOL=/opt/homebrew/bin/exiftool
+else
+  echo "[ERROR]: exiftool not found. Install it or add it to PATH." >&2
+  exit 1
+fi
+if [[ "$OS" == "Linux" ]]; then
+  if ! command -v xvfb-run &>/dev/null; then
+    echo "[ERROR]: xvfb-run is required but not installed." >&2
+    exit 1
+  fi
+fi
+
+# Diagram Files Input Validation
+if [[ ${#DIAGRAMS[@]} -eq 0 ]]; then
+  exit 0
+fi
+echo "Diagrams to convert ($FORMAT):"
+for d in "${DIAGRAMS[@]}"; do
+  echo "  - $d"
+done
+echo ""
+
+# Functions
+sha256() {
+  git show ":$1" | sha256sum | awk '{print $1}'
+}
+
+check_diagram_changes() {
+  local tmpfile="$1"
+  local out="$2"
+  local diagram_hash="$3"
+  local before_hash="$4"
+  local before_perm="$5"
+
+  "$EXIFTOOL" -Comment="drawio-diagram-hash:$diagram_hash" "$tmpfile" >/dev/null 2>&1
+
+  if [[ "$before_hash" != "n/a" ]]; then
+    mv -f "$tmpfile" "$out"
+    chmod "$before_perm" "$out"
+    echo "[ALERT]: file has changed - $out"
+    CHANGES_DETECTED=1
+  else
+    mv "$tmpfile" "$out"
+    echo "[ALERT]: new file - $out"
+    CHANGES_DETECTED=1
+  fi
+}
+
+process_diagram_page() {
+  local diagram="$1"
+  local drawio_binary="$2"
+  local output_file="$3"
+  local page_index="${4:-1}"
+
+  local tmpfile=$(mktemp)
+  local diagram_hash=$(sha256 "$diagram")
+  local before_hash="n/a"
+  local before_perm="n/a"
+
+  if [[ -f "$output_file" ]]; then
+    before_hash=$("$EXIFTOOL" -Comment -s3 "$output_file" | sed 's/^drawio-diagram-hash://')
+    if [[ "$OS" == "Linux" ]]; then
+      before_perm=$(stat -c "%a" "$output_file")
+    else
+      before_perm=$(stat -f "%Lp" "$output_file")
+    fi
+  fi
+  if [[ "$diagram_hash" != "$before_hash" ]]; then
+    if [[ "$OS" == "Linux" ]]; then
+      xvfb-run -a "$drawio_binary" \
+        --export --page-index "$page_index" --format "$FORMAT" --output "$tmpfile" "$diagram" \
+        --disable-gpu --headless --no-sandbox >/dev/null 2>&1
+    else
+      "$drawio_binary" \
+        --export --page-index "$page_index" --format "$FORMAT" --output "$tmpfile" "$diagram" \
+        --disable-gpu --headless --no-sandbox >/dev/null 2>&1
+    fi
+    check_diagram_changes "$tmpfile" "$output_file" "$diagram_hash" "$before_hash" "$before_perm"
+  fi
+}
+
+process_diagram() {
+  local diagram="$1"
+  local drawio_binary="$2"
+
+  local output_file="${diagram%.drawio}.${FORMAT}"
+  local diagram_pages="$(\
+    cat "$diagram" | grep '<diagram' | sed -n 's/.*name="\([^"]*\)".*/\1/p' | tr ' ' '-' \
+  )"
+
+  if [ "$(echo "$diagram_pages" | wc -l)" -eq 1 ]; then
+    shopt -s nullglob
+    old_exports=( "${diagram%.drawio}"--*.${FORMAT} )
+    if (( ${#old_exports[@]} )); then
+      rm -- "${old_exports[@]}"
+    fi
+    process_diagram_page "$diagram" "$drawio_binary" "$output_file"
+  else
+    if [[ -f "$output_file" ]]; then
+      rm "$output_file"
+    fi
+    index=1
+    while IFS= read -r page; do
+      [ -z "$page" ] && continue
+      output_file="${diagram%.drawio}--${page}.${FORMAT}"
+      process_diagram_page "$diagram" "$drawio_binary" "$output_file" "$index"
+      index=$((index + 1))
+    done <<< "$diagram_pages"
+  fi
+}
+
+# Linux Export
+if [[ "$OS" == "Linux" ]]; then
+  APPIMAGE_LATEST_VERSION="$(\
+    curl -Ls https://github.com/jgraph/drawio-desktop/releases/latest \
+      | grep '<title>Release' | awk -F ' ' '{print $2}' \
+  )"
+  APPIMAGE="drawio-${ARCH}-${APPIMAGE_LATEST_VERSION}.AppImage"
+  APPIMAGE_DIR="$HOME/.cache/pre-commit/drawio-bin"
+  APPIMAGE_PATH="$APPIMAGE_DIR/$APPIMAGE"
+  mkdir -p "$APPIMAGE_DIR"
+  if [[ ! -f "$APPIMAGE_PATH" ]]; then
+    curl -Ls -o "$APPIMAGE_PATH" \
+      "https://github.com/jgraph/drawio-desktop/releases/download/v${APPIMAGE_LATEST_VERSION}/${APPIMAGE}"
+    chmod +x "$APPIMAGE_PATH"
+  fi
+  if [[ ! -d "$APPIMAGE_DIR/squashfs-root" ]]; then
+    (cd "$APPIMAGE_DIR" && "./${APPIMAGE}" --appimage-extract >/dev/null 2>&1)
+  fi
+  for d in "${DIAGRAMS[@]}"; do
+    process_diagram "$d" "$APPIMAGE_DIR/squashfs-root/drawio"
+  done
+
+# MacOS Export
+elif [[ "$OS" == "Darwin" ]]; then
+  DRAWIO_BIN="/Applications/draw.io.app/Contents/MacOS/draw.io"
+  if [[ ! -x "$DRAWIO_BIN" ]]; then
+    echo "[ERROR]: Draw.io app not found in /Applications. Please install it." >&2
+    exit 1
+  fi
+  for d in "${DIAGRAMS[@]}"; do
+    process_diagram "$d" "$DRAWIO_BIN"
+  done
+
+else
+  echo "[ERROR]: Unsupported OS - $OS" >&2
+  exit 1
+fi
+
+if [[ $CHANGES_DETECTED -eq 1 ]]; then
+  exit 1
+fi
diff --git a/tests/test-multiple-pages--page-1.png b/tests/test-multiple-pages--page-1.png
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diff --git a/tests/test-multiple-pages--page-2.png b/tests/test-multiple-pages--page-2.png
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diff --git a/tests/test-multiple-pages.drawio b/tests/test-multiple-pages.drawio
new file mode 100644
index 0000000..9e5740a
--- /dev/null
+++ b/tests/test-multiple-pages.drawio
@@ -0,0 +1,24 @@
+<mxfile host="65bd71144e">
+    <diagram id="utQfjZMSyn2cbtsGGcS2" name="page-1">
+        <mxGraphModel dx="831" dy="647" grid="1" gridSize="10" guides="1" tooltips="1" connect="1" arrows="1" fold="1" page="1" pageScale="1" pageWidth="850" pageHeight="1100" math="0" shadow="0">
+            <root>
+                <mxCell id="0"/>
+                <mxCell id="1" parent="0"/>
+                <mxCell id="2" value="hello world!&lt;div&gt;(from page-1)&lt;/div&gt;" style="rounded=0;whiteSpace=wrap;html=1;" parent="1" vertex="1">
+                    <mxGeometry x="390" y="270" width="120" height="60" as="geometry"/>
+                </mxCell>
+            </root>
+        </mxGraphModel>
+    </diagram>
+    <diagram id="T94FDl7RSwVbjbK3lVt7" name="page-2">
+        <mxGraphModel dx="831" dy="647" grid="1" gridSize="10" guides="1" tooltips="1" connect="1" arrows="1" fold="1" page="1" pageScale="1" pageWidth="850" pageHeight="1100" math="0" shadow="0">
+            <root>
+                <mxCell id="0"/>
+                <mxCell id="1" parent="0"/>
+                <mxCell id="HXkTgLOOMZOfQBW7EBHr-1" value="hello again!&lt;div&gt;(from page-2)&lt;/div&gt;" style="rounded=0;whiteSpace=wrap;html=1;" vertex="1" parent="1">
+                    <mxGeometry x="360" y="300" width="120" height="60" as="geometry"/>
+                </mxCell>
+            </root>
+        </mxGraphModel>
+    </diagram>
+</mxfile>
diff --git a/tests/test-single-page.drawio b/tests/test-single-page.drawio
new file mode 100644
index 0000000..0ae39c5
--- /dev/null
+++ b/tests/test-single-page.drawio
@@ -0,0 +1,13 @@
+<mxfile host="65bd71144e">
+    <diagram id="utQfjZMSyn2cbtsGGcS2" name="tab1">
+        <mxGraphModel dx="831" dy="647" grid="1" gridSize="10" guides="1" tooltips="1" connect="1" arrows="1" fold="1" page="1" pageScale="1" pageWidth="850" pageHeight="1100" math="0" shadow="0">
+            <root>
+                <mxCell id="0"/>
+                <mxCell id="1" parent="0"/>
+                <mxCell id="2" value="hello world!" style="rounded=0;whiteSpace=wrap;html=1;" vertex="1" parent="1">
+                    <mxGeometry x="390" y="270" width="120" height="60" as="geometry"/>
+                </mxCell>
+            </root>
+        </mxGraphModel>
+    </diagram>
+</mxfile>
diff --git a/tests/test-single-page.png b/tests/test-single-page.png
new file mode 100644
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literal 0
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From e446b7fce97d1e7421a03eb32cca07f95b9cd8fb Mon Sep 17 00:00:00 2001
From: devon-thyne <dthyne75@gmail.com>
Date: Thu, 29 Jan 2026 12:46:08 -0500
Subject: [PATCH 2/2] make hook script executable

---
 hooks/drawio-auto-export.sh | 0
 1 file changed, 0 insertions(+), 0 deletions(-)
 mode change 100644 => 100755 hooks/drawio-auto-export.sh

diff --git a/hooks/drawio-auto-export.sh b/hooks/drawio-auto-export.sh
old mode 100644
new mode 100755