node: Revamp and optimize 'node' module

Changes:
- nodenv and nvm now honors (and prioritizes) `$XDG_CONFIG_HOME` over
  `$HOME` to lookup local nodenv/nvm installation.
- Make `nvm` loading lazy (via `--no-use` argument).
- Remove redundant NODENV_ROOT or NVM_DIR, respective script already
  set them up.
- Adhere to more idiomatic Zsh operation and minimize external command
  usage (like `sed`).

modules/node/README.md

@@ -9,7 +9,7 @@ enables [_npm_][2] completion.
 home directory.
 
 This will be loaded automatically if nvm is installed in `$NVM_DIR`,
-_`~/.nvm`_, or nvm is installed with Homebrew.
+_`$XDG_CONFIG_HOME/nvm`_, _`~/.nvm`_, or is installed with homebrew.
 
 ## nodenv
 
@@ -18,7 +18,7 @@ Node versions. It is simple and predictable, Just Works, and is rock solid in
 production. nodenv is forked from the popular [_rbenv_][7].
 
 This will be loaded automatically if nodenv is installed in `$NODENV_ROOT`,
-_`~/.nodenv`_, or `nodenv` is on the path.
+_`$XDG_CONFIG_HOME/nodenv`_, _`~/.nodenv`_, or `nodenv` is on the path.
 
 ## Functions
 
@@ -46,11 +46,12 @@ _The authors of this module should be contacted via the [issue tracker][4]._
 
 - [Sorin Ionescu](https://github.com/sorin-ionescu)
 - [Zeh Rizzatti](https://github.com/zehrizzatti)
+- [Indrajit Raychaudhuri](https://github.com/indrajitr)
 
 [1]: http://nodejs.org
 [2]: http://npmjs.org
 [3]: http://nodejs.org/api
 [4]: https://github.com/sorin-ionescu/prezto/issues
-[5]: https://github.com/creationix/nvm
+[5]: https://github.com/nvm-sh/nvm
 [6]: https://github.com/nodenv/nodenv
 [7]: https://github.com/sstephenson/rbenv

modules/node/functions/node-doc

@@ -13,6 +13,6 @@ if [[ -z "$BROWSER" ]]; then
 fi
 
 # TODO: Make the sections easier to use.
-"$BROWSER" "http://nodejs.org/docs/$(node --version | sed 's/-.*//')/api/all.html#${1}"
+"$BROWSER" "https://nodejs.org/docs/${$(node --version 2> /dev/null)/%-*}/api/all.html#${1}"
 
 # }

modules/node/init.zsh

@@ -1,25 +1,32 @@
 #
-# Loads the Node Version Manager and enables npm completion.
+# Configures Node local installation, loads version managers, and defines
+# variables and aliases.
 #
 # Authors:
 #   Sorin Ionescu <sorin.ionescu@gmail.com>
 #   Zeh Rizzatti <zehrizzatti@gmail.com>
 #
 
+# Possible lookup locations.
+local_nvm_paths=({$NVM_DIR,{$XDG_CONFIG_HOME/,$HOME/.}nvm}/nvm.sh(N))
+local_nodenv_paths=({$NODENV_ROOT,{$XDG_CONFIG_HOME/,$HOME/.}nodenv}/bin/nodenv(N))
+
 # Load manually installed NVM into the shell session.
-if [[ -s "${NVM_DIR:=$HOME/.nvm}/nvm.sh" ]]; then
-  source "${NVM_DIR}/nvm.sh"
+if [[ -s ${local_nvm::=$local_nvm_paths[1]} ]]; then
+  source "$local_nvm --no-use"
+  unset local_nvm{,_paths}
 
 # Load package manager installed NVM into the shell session.
-elif (( $+commands[brew] )) && \
-      [[ -d "${nvm_prefix::="$(brew --prefix nvm 2> /dev/null)"}" ]]; then
-  source "${nvm_prefix}/nvm.sh"
+elif (( $+commands[brew] )) \
+      && [[ -d "${nvm_prefix::="$(brew --prefix nvm 2> /dev/null)"}" ]]; then
+  source "$nvm_prefix/nvm.sh --no-use"
   unset nvm_prefix
 
 # Load manually installed nodenv into the shell session.
-elif [[ -s "${NODENV_ROOT:=$HOME/.nodenv}/bin/nodenv" ]]; then
-  path=("${NODENV_ROOT}/bin" $path)
+elif [[ -s ${local_nodenv::=$local_nodenv_paths[1]} ]]; then
+  path=("$local_nodenv:h" $path)
   eval "$(nodenv init - --no-rehash zsh)"
+  unset local_nodenv{,_paths}
 
 # Load package manager installed nodenv into the shell session.
 elif (( $+commands[nodenv] )); then
@@ -31,22 +38,22 @@ elif (( ! $+commands[node] )); then
 fi
 
 # Load NPM and known helper completions.
-typeset -A compl_commands=(
+typeset -A _compl_commands=(
   npm   'npm completion'
   grunt 'grunt --completion=zsh'
   gulp  'gulp --completion=zsh'
 )
 
-for compl_command in "${(k)compl_commands[@]}"; do
-  if (( $+commands[$compl_command] )); then
-    cache_file="${XDG_CACHE_HOME:-$HOME/.cache}/prezto/$compl_command-cache.zsh"
+for _compl_command in "${(k)_compl_commands[@]}"; do
+  if (( $+commands[$_compl_command] )); then
+    cache_file="${XDG_CACHE_HOME:-$HOME/.cache}/prezto/${_compl_command}-cache.zsh"
 
     # Completion commands are slow; cache their output if old or missing.
-    if [[ "$commands[$compl_command]" -nt "$cache_file" \
+    if [[ "$commands[$_compl_command]" -nt "$cache_file" \
           || "${ZDOTDIR:-$HOME}/.zpreztorc" -nt "$cache_file" \
           || ! -s "$cache_file" ]]; then
       mkdir -p "$cache_file:h"
-      command ${=compl_commands[$compl_command]} >! "$cache_file" 2> /dev/null
+      command ${=_compl_commands[$_compl_command]} >! "$cache_file" 2> /dev/null
     fi
 
     source "$cache_file"
@@ -55,4 +62,4 @@ for compl_command in "${(k)compl_commands[@]}"; do
   fi
 done
 
-unset compl_command{s,}
+unset _compl_command{s,}