use mason for dependency management

common.sh

@@ -83,6 +83,14 @@ function check_binary() {
   fi
 }
 
+function ensure_brew_binary() {
+  if ! command -v "$1" >/dev/null 2>&1; then
+    check_binary brew
+    brew install "$2"
+  fi
+  check_binary "$1"
+}
+
 export PATH="${HOME}/.local/bin:${PATH}"
 
 for BINARY in "${NVIM_REQUIRED_BINARIES[@]}"; do
@@ -94,13 +102,9 @@ if ! command -v luafmt >/dev/null 2>&1; then
 fi
 check_binary luafmt
 
-if [ "${NVIM_OS}" = "macOS" ] &&
-  ! command -v vala-language-server >/dev/null 2>&1; then
-  check_binary brew
-  brew install vala-language-server
-fi
 if [ "${NVIM_OS}" = "macOS" ]; then
-  check_binary vala-language-server
+  ensure_brew_binary pwsh powershell
+  ensure_brew_binary vala-language-server vala-language-server
 fi
 
 pushd "${SCRIPT_DIR}" 1>/dev/null 2>&1 || error_exit "failed to push: ${SCRIPT_DIR}"