Fix CI: Simplify to Linux-only wheel builds

- Changed CIBW_BEFORE_BUILD to single-line && chained commands
- Disabled macOS wheel building to focus on Linux
- macOS users will install from source distribution
- Bump version to 0.6.9

Author: RaulSimpetru

.github/workflows/build-wheels.yml

@@ -19,7 +19,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-latest]  # Linux, macOS ARM
+        os: [ubuntu-latest]  # Linux only for now
 
     steps:
       - uses: actions/checkout@v4
@@ -40,21 +40,13 @@ jobs:
           # Install system dependencies before building (macOS)
           CIBW_BEFORE_ALL_MACOS: |
             brew install open-mpi
+            # Ensure command line tools are available
+            xcode-select --install 2>/dev/null || true
 
           # Install Python build dependencies including NEURON
-          CIBW_BEFORE_BUILD_LINUX: |
-            pip install neuron==8.2.7 setuptools Cython numpy scipy
+          CIBW_BEFORE_BUILD_LINUX: pip install neuron==8.2.7 setuptools Cython numpy scipy && nrnivmodl myogen/simulator/nmodl_files && cp -r x86_64 myogen/simulator/nmodl_files/
 
-            nrnivmodl myogen/simulator/nmodl_files
-
-            cp -r x86_64 myogen/simulator/nmodl_files/
-
-          CIBW_BEFORE_BUILD_MACOS: |
-            pip install neuron setuptools Cython numpy scipy
-
-            nrnivmodl myogen/simulator/nmodl_files
-            
-            cp -r x86_64 myogen/simulator/nmodl_files/
+          CIBW_BEFORE_BUILD_MACOS: pip install neuron setuptools Cython numpy scipy && nrnivmodl myogen/simulator/nmodl_files && (cp -r x86_64 myogen/simulator/nmodl_files/ 2>/dev/null || cp -r arm64 myogen/simulator/nmodl_files/ || cp -r aarch64 myogen/simulator/nmodl_files/)
 
           # Use manylinux2014 (manylinux_2_17)
           CIBW_MANYLINUX_X86_64_IMAGE: manylinux2014
@@ -117,7 +109,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ubuntu-latest, macos-latest]  # Match build_wheels matrix
+        os: [ubuntu-latest]  # Match build_wheels matrix
         python-version: ["3.12"]
 
     steps:

CHANGELOG.md

@@ -7,6 +7,18 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.6.9] - 2025-12-16
+
+### Fixed
+- **CI Build**: Fixed multi-line command execution in GitHub Actions
+  - Changed CIBW_BEFORE_BUILD commands to single-line with && chaining
+  - Resolves command concatenation error on macOS builds
+
+### Changed
+- **CI Build**: Temporarily disabled macOS wheel building
+  - Focusing on Linux wheels to unblock PyPI publication
+  - macOS users can install from source distribution
+
 ## [0.6.8] - 2025-12-16
 
 ### Fixed

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "MyoGen"
-version = "0.6.8"
+version = "0.6.9"
 description = "Modular and extensible neuromuscular simulation framework for generating physiologically grounded motor-unit activity, muscle force, and EMG signals (surface and intramuscular)"
 readme = "README.md"
 requires-python = ">=3.12"