Add svg support

.github/workflows/github-actions.yml

@@ -16,7 +16,7 @@ jobs:
     - uses: actions/checkout@v3
     - uses: actions/setup-python@v4
       with:
-        python-version: 3.9
+        python-version: 3.11
     - run: bash .github/workflows/install_ci_python_dep.sh
     - run: pre-commit run -a
 
@@ -27,7 +27,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: [3.7, 3.8, 3.9, "3.10"]
+        python-version: ["3.9", "3.10", "3.11", "3.12"]
     steps:
     - uses: actions/checkout@v3
     - uses: actions/setup-python@v4

.pre-commit-config.yaml

@@ -4,7 +4,7 @@
 fail_fast: false
 repos:
 -   repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v4.4.0
+    rev: v5.0.0
     hooks:
     -   id: check-ast
     -   id: check-merge-conflict
@@ -15,14 +15,15 @@ repos:
         types: [python]
 
 -   repo: https://github.com/pycqa/flake8
-    rev: 6.0.0
+    rev: 7.1.1
     hooks:
     -   id: flake8
         name: flake8-blocking
         args: [ '--isolated', '--select=P,F401,F821,F901', '--ignore=P101,P102' ]
         additional_dependencies:
             - flake8-string-format
+
 -   repo: https://github.com/psf/black
-    rev: 22.12.0
+    rev: 24.10.0
     hooks:
-    -   id: black
+    -   id: black

.pre-commit-hooks.yaml

@@ -5,10 +5,24 @@
   language: python
   files: '.dot$'
   pass_filenames: true
-- id: render-dot
-  name: render dot
+- id: render-dot-png
+  name: render dot to png
   description: render all .dot to .dot.png
-  entry: render-dot
+  entry: render-dot-png
+  language: python
+  files: '.dot$'
+  pass_filenames: true
+- id: render-dot-svg
+  name: render dot to svg
+  description: render all .dot to .dot.svg
+  entry: render-dot-svg
   language: python
   files: '.dot$'
   pass_filenames: true
+- id: render-dot
+  name: render dot to png (legacy hook - switch to render-dot-png)
+  description: render all .dot to .dot.png
+  entry: render-dot-png
+  language: python
+  files: '.dot$'
+  pass_filenames: true

Makefile

@@ -3,7 +3,7 @@ MAKEFLAGS += --silent
 
 .PHONY: setup-venv test
 
-PYTHON_VERSION = "3.8.6"
+PYTHON_VERSION = "3.11.9"
 VENV_NAME := $(shell cat .python-version)
 
 

README.md

@@ -17,17 +17,25 @@ and we are sure that both version match and developers don't forget to render th
 ## Hooks available
 
 ### `check-dot`
-Verify the syntax of .dot files:
+Verify the syntax of .dot files
 
 
 ### `render-dot`
+Is an alias for `render-dot-png`, kept for backward compatibility
+
+
+### `render-dot-png`
 Render .dot files to png. This command can work in 2 ways
 
   - Called without argument, it will render the .png next to the .dot files (simply appending ".png" to the .dot file path)
   - `--only src1,src2` can be used to select the files to be rendered
   - `--only src1:target1,src2:target2` can be used to specify custom locations for the PNG (specified per .dot source)
 
 
+### `render-dot-svg`
+Same as `render-dot-png` but renders to svg. Rendering to svg may be more stable as it is less sensitive to fonts and other dependencies.
+Discrepancies were observed when using the png hook between ubuntu 22 and ubuntu 24 for instance.
+
 ## Pre-commit integration
 
 An example `.pre-commit-config.yaml`:
@@ -38,7 +46,7 @@ repos:
     rev: master
     hooks:
       - id: check-dot
-      - id: render-dot
+      - id: render-dot-png
         # args: ["--only=class_diagram.dot:docs/class_diagram.png"]
 ```
 

graphviz_dot_hooks/check_dot.py

@@ -10,9 +10,11 @@
 def _verify_dot_rendering(dot_filepath: str) -> Tuple[bool, Optional[str]]:
     """Trying to render it would detect syntax error, there are probably cheaper way to check this
     but we aren't really looking after performance here"""
-    with tempfile.NamedTemporaryFile(suffix=".png") as tmpf:
+    with tempfile.NamedTemporaryFile(suffix=f".{format}") as tmpf:
         try:
-            render("dot", "png", dot_filepath, outfile=tmpf.name)
+            # arbitrary render as svg (more generic than png)
+            # but it doesn't matter much as we are mostly interested in .dot syntax
+            render("dot", "svg", dot_filepath, outfile=tmpf.name)
         except CalledProcessError as ex:
             return False, str(ex)
 

graphviz_dot_hooks/render_dot_png.py

@@ -0,0 +1,51 @@
+import argparse
+import sys
+from typing import Dict
+
+from graphviz_dot_hooks.utils import render_dotfiles, _parse_only_convert
+
+parser = argparse.ArgumentParser()
+parser.add_argument("instancefiles", nargs="+", help=".dot files to check")
+parser.add_argument(
+    "--only",
+    action="store",
+    type=str,
+    default=None,
+    required=False,
+    help="string with coma-separated values, target files can be specified as well in the format '--only src1:target1,src2:target2'"
+    " Example: --only dotfile1.dot,dotfile2.dot"
+    "          --only dotfile1.dot:doc/dotfile1.png,dotfile2.dot",
+)
+
+
+def main():
+    args = parser.parse_args()
+
+    format = "png"
+
+    convert_map: Dict[str, str]
+    if args.only:
+        # Take the intersection of the instancefiles and the --only
+        convert_map = _parse_only_convert(args.only, format=format)
+        convert_map = {
+            src: target
+            for src, target in convert_map.items()
+            if src in args.instancefiles
+        }
+    else:
+        # Take the instancefiles
+        convert_map = _parse_only_convert(",".join(args.instancefiles), format=format)
+
+    success, messages = render_dotfiles(convert_map, format=format)
+
+    for message in messages:
+        print(message)
+
+    if success:
+        sys.exit(0)
+    else:
+        sys.exit(1)
+
+
+if __name__ == "__main__":
+    main()

graphviz_dot_hooks/render_dot_svg.py

@@ -0,0 +1,51 @@
+import argparse
+import sys
+from typing import Dict
+
+from graphviz_dot_hooks.utils import render_dotfiles, _parse_only_convert
+
+parser = argparse.ArgumentParser()
+parser.add_argument("instancefiles", nargs="+", help=".dot files to check")
+parser.add_argument(
+    "--only",
+    action="store",
+    type=str,
+    default=None,
+    required=False,
+    help="string with coma-separated values, target files can be specified as well in the format '--only src1:target1,src2:target2'"
+    " Example: --only dotfile1.dot,dotfile2.dot"
+    "          --only dotfile1.dot:doc/dotfile1.svg,dotfile2.dot",
+)
+
+
+def main():
+    args = parser.parse_args()
+
+    format = "svg"
+
+    convert_map: Dict[str, str]
+    if args.only:
+        # Take the intersection of the instancefiles and the --only
+        convert_map = _parse_only_convert(args.only, format=format)
+        convert_map = {
+            src: target
+            for src, target in convert_map.items()
+            if src in args.instancefiles
+        }
+    else:
+        # Take the instancefiles
+        convert_map = _parse_only_convert(",".join(args.instancefiles), format=format)
+
+    success, messages = render_dotfiles(convert_map, format=format)
+
+    for message in messages:
+        print(message)
+
+    if success:
+        sys.exit(0)
+    else:
+        sys.exit(1)
+
+
+if __name__ == "__main__":
+    main()