Make bump_version script runnable on MacOS

tools/bump_version.sh

@@ -1,7 +1,7 @@
 #!/bin/bash
 # Bump the CEBRA version to the specified value.
 # Edits all relevant files at once.
-# 
+#
 # Usage:
 # tools/bump_version.sh 0.3.1rc1
 
@@ -10,24 +10,36 @@ if [ -z ${version} ]; then
     >&1 echo "Specify a version number."
     >&1 echo "Usage:"
     >&1 echo "tools/bump_version.sh <semantic version>"
+    exit 1
+fi
+
+# Determine the correct sed command based on the OS
+# On macOS, the `sed` command requires an empty string argument after `-i` for in-place editing.
+# On Linux and other Unix-like systems, the `sed` command only requires `-i` for in-place editing.
+if [[ "$OSTYPE" == "darwin"* ]]; then
+    # macOS
+    SED_CMD="sed -i .bkp -e"
+else
+    # Linux and other Unix-like systems
+    SED_CMD="sed -i -e"
 fi
 
 # python cebra version
-sed -i "s/__version__ = .*/__version__ = \"${version}\"/" \
-    cebra/__init__.py
+$SED_CMD "s/__version__ = .*/__version__ = \"${version}\"/" cebra/__init__.py
 
 # reinstall script in root
-sed -i "s/VERSION=.*/VERSION=${version}/" \
-    reinstall.sh
+$SED_CMD "s/VERSION=.*/VERSION=${version}/" reinstall.sh
 
 # Makefile
-sed -i "s/CEBRA_VERSION := .*/CEBRA_VERSION := ${version}/" \
-    Makefile
+$SED_CMD "s/CEBRA_VERSION := .*/CEBRA_VERSION := ${version}/" Makefile
 
-# Arch linux PKGBUILD 
-sed -i "s/pkgver=.*/pkgver=${version}/" \
-    PKGBUILD 
+# Arch linux PKGBUILD
+$SED_CMD "s/pkgver=.*/pkgver=${version}/" PKGBUILD
 
 # Dockerfile
-sed -i "s/ENV WHEEL=cebra-.*\.whl/ENV WHEEL=cebra-${version}-py2.py3-none-any.whl/" \
-    Dockerfile 
+$SED_CMD "s/ENV WHEEL=cebra-.*\.whl/ENV WHEEL=cebra-${version}-py2.py3-none-any.whl/" Dockerfile
+
+# Remove backup files
+if [[ "$OSTYPE" == "darwin"* ]]; then
+    rm cebra/__init__.py.bkp reinstall.sh.bkp Makefile.bkp PKGBUILD.bkp Dockerfile.bkp
+fi