revise error

brew_install.zsh

@@ -2,20 +2,7 @@
 
 export HOMEBREW_NO_AUTO_UPDATE=1
 
-# command isntall
-formulas=(
-echo "installing homebrew..."
-which brew >/dev/null 2>&1 || /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
-
-echo "run brew doctor..."
-which brew >/dev/null 2>&1 && brew doctor
-
-echo "run brew update..."
-which brew >/dev/null 2>&1 && brew update
-
-echo "run brew upgrade..."
-brew upgrade
-
+# command install
 formulas=(
     fzf
     sheldon
@@ -38,25 +25,42 @@ casks=(
   zoom
 )
 
+# Install Homebrew if not installed
+which brew >/dev/null 2>&1 || /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
+
+# Run brew doctor
+which brew >/dev/null 2>&1 && brew doctor
+
+# Run brew update
+which brew >/dev/null 2>&1 && brew update
+
+# Run brew upgrade
+brew upgrade
+
 brew update
 brew tap homebrew/cask-fonts
 brew tap ktr0731/evans
 brew tap jesseduffield/lazydocker
 
-for formula in ${formulas[@]}; do
-  brew install ${formula}
+# Install formulas
+for formula in "${formulas[@]}"; do
+  brew install "$formula"
 done
 
-eval "$(starship init zsh)"
+# Initialize starship if installed
+if command -v starship >/dev/null 2>&1; then
+  eval "$(starship init zsh)"
+fi
+
 case "${OSTYPE}" in
 darwin*)
-  for cask in ${casks[@]}; do
-    brew install --cask ${cask}
+  for cask in "${casks[@]}"; do
+    brew install --cask "$cask"
   done
 
   GCC_VER=$(ls $(brew --prefix)/bin | grep -E "^g\+\+\-(\d+) \->" | awk '{print $1}' | sed -e "s/g++-//g")
-  sudo ln -snfv $(brew --prefix gcc)/gcc-${GCC_VER} /usr/local/bin/gcc
-  sudo ln -snfv $(brew --prefix gcc)/g++-${GCC_VER} /usr/local/bin/g++
+  sudo ln -snfv "$(brew --prefix gcc)/gcc-${GCC_VER}" /usr/local/bin/gcc
+  sudo ln -snfv "$(brew --prefix gcc)/g++-${GCC_VER}" /usr/local/bin/g++
   ;;
 linux*)
   brew install docker