add lazy-loading of setup scripts for commands that aren't used very often

functions.zsh

@@ -15,3 +15,17 @@ command_exists() {
 source_if_exists() {
   [[ -f $1 ]] && source "$1"
 }
+
+run_before() {
+  local command="$1"
+  local init_command="$2"
+
+  eval "$(cat <<EOF
+$command() {
+  unfunction $command
+  $init_command
+  $command \$@
+}
+EOF
+)"
+}

zshrc

@@ -19,9 +19,6 @@ for script in "$DOTFILES_DIR"/{functions,path,exports,aliases,oh-my-zsh}.zsh; do
   source "$script"
 done
 
-# rbenv
-command_exists rbenv && eval "$(rbenv init -)"
-# sdkman
-source_if_exists "$SDKMAN_DIR/bin/sdkman-init.sh"
-# Yarn completion
-source_if_exists "/usr/local/lib/node_modules/yarn-completions/node_modules/tabtab/.completions/yarn.zsh"
+run_before rbenv 'eval "$(rbenv init -)"'
+run_before sdk 'source_if_exists "$SDKMAN_DIR/bin/sdkman-init.sh"'
+run_before yarn 'source_if_exists "$(yarn global dir)/node_modules/tabtab/.completions/yarn.zsh"'