refactor: refactor installer script for maintainability and robustness

- Replace individual color variable definitions with a Bash associative array for improved maintainability
- Update references to color codes in print_message and related strings to use the associative array
- Use mktemp to create a secure temporary directory during installation, replacing a static directory
- Improve PATH handling: notify if the install directory is already present in PATH and avoid re-adding

Signed-off-by: appleboy <appleboy.tw@gmail.com>

Author: appleboy

install

@@ -2,11 +2,13 @@
 set -euo pipefail
 APP=opencode
 
-RED='\033[0;31m'
-GREEN='\033[0;32m'
-YELLOW='\033[1;33m'
-ORANGE='\033[38;2;255;140;0m'
-NC='\033[0m' # No Color
+declare -A colors=(
+    [RED]='\033[0;31m'
+    [GREEN]='\033[0;32m'
+    [YELLOW]='\033[1;33m'
+    [ORANGE]='\033[38;2;255;140;0m'
+    [NC]='\033[0m'
+)
 
 requested_version=${VERSION:-}
 
@@ -17,22 +19,21 @@ fi
 arch=$(uname -m)
 
 if [[ "$arch" == "aarch64" ]]; then
-  arch="arm64"
+    arch="arm64"
 fi
 
 filename="$APP-$os-$arch.tar.gz"
 
-
 case "$filename" in
-    *"-linux-"*)
-        [[ "$arch" == "x86_64" || "$arch" == "arm64" || "$arch" == "i386" ]] || exit 1
+*"-linux-"*)
+    [[ "$arch" == "x86_64" || "$arch" == "arm64" || "$arch" == "i386" ]] || exit 1
     ;;
-    *"-mac-"*)
-        [[ "$arch" == "x86_64" || "$arch" == "arm64" ]] || exit 1
+*"-mac-"*)
+    [[ "$arch" == "x86_64" || "$arch" == "arm64" ]] || exit 1
     ;;
-    *)
-        echo "${RED}Unsupported OS/Arch: $os/$arch${NC}"
-        exit 1
+*)
+    echo "${RED}Unsupported OS/Arch: $os/$arch${NC}"
+    exit 1
     ;;
 esac
 
@@ -58,19 +59,18 @@ print_message() {
     local color=""
 
     case $level in
-        info) color="${GREEN}" ;;
-        warning) color="${YELLOW}" ;;
-        error) color="${RED}" ;;
+    info) color="${colors[GREEN]}" ;;
+    warning) color="${colors[YELLOW]}" ;;
+    error) color="${colors[RED]}" ;;
     esac
 
-    echo -e "${color}${message}${NC}"
+    echo -e "${color}${message}${colors[NC]}"
 }
 
 check_version() {
     if command -v opencode >/dev/null 2>&1; then
         opencode_path=$(which opencode)
 
-
         ## TODO: check if version is installed
         # installed_version=$(opencode version)
         installed_version="0.0.1"
@@ -87,24 +87,23 @@ check_version() {
 
 download_and_install() {
     print_message info "Downloading ${ORANGE}opencode ${GREEN}version: ${YELLOW}$specific_version ${GREEN}..."
-    mkdir -p opencodetmp && cd opencodetmp
+    temp_dir=$(mktemp -d) && cd "$temp_dir"
     curl -# -L $url | tar xz
     mv opencode $INSTALL_DIR
-    cd .. && rm -rf opencodetmp 
+    cd .. && rm -rf opencodetmp
 }
 
 check_version
 download_and_install
 
-
 add_to_path() {
     local config_file=$1
     local command=$2
 
     if [[ -w $config_file ]]; then
-        echo -e "\n# opencode" >> "$config_file"
-        echo "$command" >> "$config_file"
-        print_message info "Successfully added ${ORANGE}opencode ${GREEN}to \$PATH in $config_file"
+        echo -e "\n# opencode" >>"$config_file"
+        echo "$command" >>"$config_file"
+        print_message info "Successfully added ${colors[ORANGE]}opencode ${colors[GREEN]}to \$PATH in $config_file"
     else
         print_message warning "Manually add the directory to $config_file (or similar):"
         print_message info "  $command"
@@ -115,24 +114,24 @@ XDG_CONFIG_HOME=${XDG_CONFIG_HOME:-$HOME/.config}
 
 current_shell=$(basename "$SHELL")
 case $current_shell in
-    fish)
-        config_files="$HOME/.config/fish/config.fish"
+fish)
+    config_files="$HOME/.config/fish/config.fish"
     ;;
-    zsh)
-        config_files="$HOME/.zshrc $HOME/.zshenv $XDG_CONFIG_HOME/zsh/.zshrc $XDG_CONFIG_HOME/zsh/.zshenv"
+zsh)
+    config_files="$HOME/.zshrc $HOME/.zshenv $XDG_CONFIG_HOME/zsh/.zshrc $XDG_CONFIG_HOME/zsh/.zshenv"
     ;;
-    bash)
-        config_files="$HOME/.bashrc $HOME/.bash_profile $HOME/.profile $XDG_CONFIG_HOME/bash/.bashrc $XDG_CONFIG_HOME/bash/.bash_profile"
+bash)
+    config_files="$HOME/.bashrc $HOME/.bash_profile $HOME/.profile $XDG_CONFIG_HOME/bash/.bashrc $XDG_CONFIG_HOME/bash/.bash_profile"
     ;;
-    ash)
-        config_files="$HOME/.ashrc $HOME/.profile /etc/profile"
+ash)
+    config_files="$HOME/.ashrc $HOME/.profile /etc/profile"
     ;;
-    sh)
-        config_files="$HOME/.ashrc $HOME/.profile /etc/profile"
+sh)
+    config_files="$HOME/.ashrc $HOME/.profile /etc/profile"
     ;;
-    *)
-        # Default case if none of the above matches
-        config_files="$HOME/.bashrc $HOME/.bash_profile $XDG_CONFIG_HOME/bash/.bashrc $XDG_CONFIG_HOME/bash/.bash_profile"
+*)
+    # Default case if none of the above matches
+    config_files="$HOME/.bashrc $HOME/.bash_profile $XDG_CONFIG_HOME/bash/.bashrc $XDG_CONFIG_HOME/bash/.bash_profile"
     ;;
 esac
 
@@ -149,32 +148,33 @@ if [[ -z $config_file ]]; then
     exit 1
 fi
 
-if [[ ":$PATH:" != *":$INSTALL_DIR:"* ]]; then
+if [[ ":$PATH:" == *":$INSTALL_DIR:"* ]]; then
+    print_message info "PATH already contains install directory: $INSTALL_DIR"
+else
     case $current_shell in
-        fish)
-            add_to_path "$config_file" "fish_add_path $INSTALL_DIR"
+    fish)
+        add_to_path "$config_file" "fish_add_path $INSTALL_DIR"
         ;;
-        zsh)
-            add_to_path "$config_file" "export PATH=$INSTALL_DIR:\$PATH"
+    zsh)
+        add_to_path "$config_file" "export PATH=$INSTALL_DIR:\$PATH"
         ;;
-        bash)
-            add_to_path "$config_file" "export PATH=$INSTALL_DIR:\$PATH"
+    bash)
+        add_to_path "$config_file" "export PATH=$INSTALL_DIR:\$PATH"
         ;;
-        ash)
-            add_to_path "$config_file" "export PATH=$INSTALL_DIR:\$PATH"
+    ash)
+        add_to_path "$config_file" "export PATH=$INSTALL_DIR:\$PATH"
         ;;
-        sh)
-            add_to_path "$config_file" "export PATH=$INSTALL_DIR:\$PATH"
+    sh)
+        add_to_path "$config_file" "export PATH=$INSTALL_DIR:\$PATH"
         ;;
-        *)
-            print_message warning "Manually add the directory to $config_file (or similar):"
-            print_message info "  export PATH=$INSTALL_DIR:\$PATH"
+    *)
+        print_message warning "Manually add the directory to $config_file (or similar):"
+        print_message info "  export PATH=$INSTALL_DIR:\$PATH"
         ;;
     esac
 fi
 
 if [ -n "${GITHUB_ACTIONS-}" ] && [ "${GITHUB_ACTIONS}" == "true" ]; then
-    echo "$INSTALL_DIR" >> $GITHUB_PATH
+    echo "$INSTALL_DIR" >>$GITHUB_PATH
     print_message info "Added $INSTALL_DIR to \$GITHUB_PATH"
 fi
-