From 3949154a19a1e58ad6840fdcd30b574dc46b4f5d Mon Sep 17 00:00:00 2001
From: Tyler Fox <tyler@blur.com>
Date: Tue, 3 Sep 2024 11:10:14 -0700
Subject: [PATCH] Automatically set the version number by the latest tag

---
 .github/workflows/main.yml |  2 ++
 .gitignore                 |  3 +++
 meson.build                | 36 +++++++++++++++++++++++-------------
 src/pluginMain.cpp         |  1 +
 src/version.h.in           |  3 +++
 5 files changed, 32 insertions(+), 13 deletions(-)
 create mode 100644 src/version.h.in

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 7952588..869dd0c 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -49,6 +49,8 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v4
+      - run: git fetch --tags origin
+
       - name: Get Maya Devkit
         id: get-devkit
         uses: blurstudio/mayaModuleActions/getMayaDevkit@v1
diff --git a/.gitignore b/.gitignore
index 99f03d6..bac292a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -57,3 +57,6 @@ $RECYCLE.BIN/
 Network Trash Folder
 Temporary Items
 .apdisk
+
+# Auto-created version files
+version.h
diff --git a/meson.build b/meson.build
index 807f87a..49b65fc 100644
--- a/meson.build
+++ b/meson.build
@@ -4,21 +4,31 @@ maya_dep = dependency('maya')
 maya_name_suffix = maya_dep.get_variable('name_suffix')
 maya_version = maya_dep.get_variable('maya_version')
 
-source_files = files([
-    'src/pluginMain.cpp',
-    'src/drawOverride.cpp',
-    'src/twistSplineData.cpp',
-    'src/twistSplineNode.cpp',
-    'src/riderConstraint.cpp',
-    'src/twistTangentNode.cpp',
-    'src/twistMultiTangentNode.cpp',
-])
+source_files = [
+  'src/pluginMain.cpp',
+  'src/drawOverride.cpp',
+  'src/twistSplineData.cpp',
+  'src/twistSplineNode.cpp',
+  'src/riderConstraint.cpp',
+  'src/twistTangentNode.cpp',
+  'src/twistMultiTangentNode.cpp',
+]
 
-latest_tag = run_command('git', 'describe', '--tags', '--abbrev=0').stdout().strip()
-if latest_tag == ''
-  latest_tag = 'NOTAG'
+# If a user-built version file exists, then just use that
+# Otherwise grab the latest tag from git
+fs = import('fs')
+if fs.is_file('src/version.h')
+  message('Using existing version.h')
+else
+  git = find_program('git', native: true, required: true)
+  version_h = vcs_tag(
+    command: [git, 'describe', '--tags', '--match', 'v[0-9]*', '--dirty=+'],
+    fallback: 'v0.0.1',
+    input: 'src/version.h.in',
+    output: 'version.h',
+  )
+  source_files = source_files + version_h
 endif
-add_project_arguments('-DVERSION_STRING="' + latest_tag + '"', language: 'cpp')
 
 outlib = shared_library(
   meson.project_name(),
diff --git a/src/pluginMain.cpp b/src/pluginMain.cpp
index 8476ef8..7ca32e0 100644
--- a/src/pluginMain.cpp
+++ b/src/pluginMain.cpp
@@ -29,6 +29,7 @@ SOFTWARE.
 #include "twistMultiTangentNode.h"
 #include "drawOverride.h"
 #include <maya/MFnPlugin.h>
+#include "version.h"
 
 MStatus initializePlugin( MObject obj ) {
 	MStatus   status;
diff --git a/src/version.h.in b/src/version.h.in
new file mode 100644
index 0000000..b7f88a8
--- /dev/null
+++ b/src/version.h.in
@@ -0,0 +1,3 @@
+#pragma once
+#define VERSION_STRING "@VCS_TAG@"
+