Add command-exists shell helper

zsh/aliases.zsh

@@ -27,7 +27,7 @@ alias di="colordiff"
 alias devnullsmtp="java -jar $DOTBIN/DevNullSmtp.jar"
 
 # Homebrew
-if (( $+commands[brew] )); then
+if command-exists brew; then
   alias br="brew"
   alias ca="brew cask"
   alias cask="brew cask"
@@ -36,7 +36,7 @@ if (( $+commands[brew] )); then
 fi
 
 # Flutter
-if (( $+commands[flutter] )); then
+if command-exists flutter; then
   alias fl="flutter"
 fi
 

zsh/docker.zsh

@@ -10,7 +10,7 @@ docker_remove_exited () {
   docker rm "$(docker ps -f='status=exited' -q)"
 }
 
-if (( $+commands[docker] )); then
+if command-exists docker; then
   zinit ice from'gh-r' as'program' mv'ctop-* -> ctop'
   zinit light bcicen/ctop
 fi

zsh/kubernetes.zsh

@@ -6,7 +6,7 @@ alias kc="kubectl"
 alias hl="helm"
 alias mk="minikube"
 
-if (( $+commands[kubectl] )); then
+if command-exists kubectl; then
   # lazy-load kubectl setup
   _kubectl() {
     unset -f _kubectl

zsh/less.zsh

@@ -5,7 +5,7 @@
 alias le="less"
 
 # Enable syntax highlighting via source-highlight
-if (( $+commands[src-hilite-lesspipe.sh] )); then
+if command-exists "src-hilite-lesspipe.sh"; then
   export LESSOPEN="| src-hilite-lesspipe.sh %s"
   export LESS=" -R "
 elif [ -f "/usr/share/source-highlight/src-hilite-lesspipe.sh" ]; then

zsh/python.zsh

@@ -10,12 +10,12 @@ install_python_global_packages () {
     'yamllint'
   )
 
-  if [[ "$OSTYPE" == "darwin"* ]] && (( $+commands[brew] )); then
+  if [[ "$OSTYPE" == "darwin"* ]] && command-exists brew; then
     brew list python >/dev/null || brew install python
   fi
 
   local pipcmd="pip"
-  if (( $+commands[pip3] )); then; pipcmd="pip3"; fi
+  if command-exists pip3; then pipcmd="pip3"; fi
 
   "$pipcmd" install --upgrade setuptools
   "$pipcmd" install --upgrade "${packages[@]}"

zsh/ruby.zsh

@@ -50,7 +50,7 @@ alias bo="bundle open"
 alias bp="bundle package"
 alias bu="bundle update"
 
-if (( $+commands[rbenv] )); then
+if command-exists rbenv; then
   # lazy-load rbenv
   rbenv() {
     load-rbenv