installer: add option to install without replacing .zshrc (#8209)

* Add option to install OMZ without replacing .zshrc

tools/install.sh respects REPLACE_RC environment variable
--noreplace-rc flag sets REPLACE_RC='no'

* Change REPLACE_RC=no to KEEP_ZSHRC=yes

Change --noreplace-rc to --keep-zshrc

plugins/npm/npm.plugin.zsh

@@ -1,14 +1,16 @@
 (( $+commands[npm] )) && {
-    __NPM_COMPLETION_FILE="${ZSH_CACHE_DIR:-$ZSH/cache}/npm_completion"
+  rm -f "${ZSH_CACHE_DIR:-$ZSH/cache}/npm_completion"
 
-    if [[ ! -f $__NPM_COMPLETION_FILE ]]; then
+  _npm_completion() {
-        npm completion >! $__NPM_COMPLETION_FILE 2>/dev/null
+    local si=$IFS
-        [[ $? -ne 0 ]] && rm -f $__NPM_COMPLETION_FILE
+    compadd -- $(COMP_CWORD=$((CURRENT-1)) \
-    fi
+                 COMP_LINE=$BUFFER \
-
+                 COMP_POINT=0 \
-    [[ -f $__NPM_COMPLETION_FILE ]] && source $__NPM_COMPLETION_FILE
+                 npm completion -- "${words[@]}" \
-
+                 2>/dev/null)
-    unset __NPM_COMPLETION_FILE
+    IFS=$si
+  }
+  compdef _npm_completion npm
 }
 
 # Install dependencies globally

tools/install.sh

@@ -20,12 +20,14 @@
 #   BRANCH  - branch to check out immediately after install (default: master)
 #
 # Other options:
-#   CHSH    - 'no' means the installer will not change the default shell (default: yes)
+#   CHSH       - 'no' means the installer will not change the default shell (default: yes)
-#   RUNZSH  - 'no' means the installer will not run zsh after the install (default: yes)
+#   RUNZSH     - 'no' means the installer will not run zsh after the install (default: yes)
+#   KEEP_ZSHRC - 'yes' means the installer will not replace an existing .zshrc (default: no)
 #
 # You can also pass some arguments to the install script to set some these options:
 #   --skip-chsh: has the same behavior as setting CHSH to 'no'
 #   --unattended: sets both CHSH and RUNZSH to 'no'
+#   --keep-zshrc: sets KEEP_ZSHRC to 'yes'
 # For example:
 #   sh install.sh --unattended
 #
@@ -40,6 +42,7 @@ BRANCH=${BRANCH:-master}
 # Other options
 CHSH=${CHSH:-yes}
 RUNZSH=${RUNZSH:-yes}
+KEEP_ZSHRC=${KEEP_ZSHRC:-no}
 
 
 command_exists() {
@@ -111,6 +114,11 @@ setup_zshrc() {
 	# Must use this exact name so uninstall.sh can find it
 	OLD_ZSHRC=~/.zshrc.pre-oh-my-zsh
 	if [ -f ~/.zshrc ] || [ -h ~/.zshrc ]; then
+		# Skip this if the user doesn't want to replace an existing .zshrc
+		if [ $KEEP_ZSHRC = yes ]; then
+			echo "${YELLOW}Found ~/.zshrc.${RESET} ${GREEN}Keeping...${RESET}"
+			return
+		fi
 		if [ -e "$OLD_ZSHRC" ]; then
 			OLD_OLD_ZSHRC="${OLD_ZSHRC}-$(date +%Y-%m-%d_%H-%M-%S)"
 			if [ -e "$OLD_OLD_ZSHRC" ]; then
@@ -227,6 +235,7 @@ main() {
 		case $1 in
 			--unattended) RUNZSH=no; CHSH=no ;;
 			--skip-chsh) CHSH=no ;;
+			--keep-zshrc) KEEP_ZSHRC=yes ;;
 		esac
 		shift
 	done