fix syntax for mac

install.sh

@@ -1,32 +1,22 @@
 #!/usr/bin/env bash
 
 install_packages() {
-  declare -A osInfo;
-  osInfo[/usr/bin/pacman]=pacman
-  osInfo[/usr/bin/apt]=apt
-  osInfo[/usr/local/Homebrew]=brew
+  if [[ -f /usr/bin/pacman ]]; then
+    sudo pacman -S clang make cmake fltk catch2
 
-  for f in ${!osInfo[@]}
-  do
-    if [[ -f $f ]];then
-      if [[ ${osInfo[$f]} == 'pacman' ]]; then
-        sudo pacman -S clang make cmake fltk catch2
+    elif [[ -f /usr/bin/apt ]]; then
+      sudo apt install clang make cmake clang-tidy libfltk1.3 libfltk1.3-dev
 
-      elif [[ ${osInfo[$f]} == 'apt' ]]; then
-        sudo apt install clang make cmake clang-tidy libfltk1.3 libfltk1.3-dev
+      git clone https://github.com/catchorg/Catch2.git
+      cd Catch2
+      cmake -Bbuild -H. -DBUILD_TESTING=OFF
+      sudo cmake --build build/ --target install
+      cd ..
 
-        git clone https://github.com/catchorg/Catch2.git
-        cd Catch2
-        cmake -Bbuild -H. -DBUILD_TESTING=OFF
-        sudo cmake --build build/ --target install
-        cd ..
-
-      elif [[ ${osInfo[$f]} == 'brew' ]]; then
-        sudo brew install llvm clang make cmake clang-format fltk catch2
-        
-      fi
+    elif [[ -f /usr/local/Homebrew ]]; then
+      sudo brew install llvm clang make cmake clang-format fltk catch2
+          
     fi
-  done
 }