feat(init)!: allow turning off aliases for libs and plugins (#11550)

BREAKING CHANGE: the previous zstyle setting to disable `lib/directories.zsh` aliases has
been changed to the new syntax: `zstyle ':omz:lib:directories' aliases no`. See
https://github.com/ohmyzsh/ohmyzsh#skip-aliases to see other ways you can use this setting.
    
Co-authored-by: Carlo Sala <carlosalag@protonmail.com>

oh-my-zsh.sh

@@ -146,22 +146,51 @@ if command mkdir "${ZSH_COMPDUMP}.lock" 2>/dev/null; then
   command rm -rf "$ZSH_COMPDUMP.zwc.old" "${ZSH_COMPDUMP}.lock" 
 fi
 
+_omz_source() {
+  local context filepath="$1"
+
+  # Construct zstyle context based on path
+  case "$filepath" in
+  lib/*) context="lib:${filepath:t:r}" ;;          # :t = lib_name.zsh, :r = lib_name
+  plugins/*) context="plugins:${filepath:h2:t}" ;; # :h2 = plugins/plugin_name, :t = plugin_name
+  esac
+
+  local disable_aliases=0
+  zstyle -T ":omz:${context}" aliases || disable_aliases=1
+
+  # Back up alias names prior to sourcing
+  local -a aliases_pre galiases_pre
+  if (( disable_aliases )); then
+    aliases_pre=("${(@k)aliases}")
+    galiases_pre=("${(@k)galiases}")
+  fi
+
+  # Source file from $ZSH_CUSTOM if it exists, otherwise from $ZSH
+  if [[ -f "$ZSH_CUSTOM/$filepath" ]]; then
+    source "$ZSH_CUSTOM/$filepath"
+  elif [[ -f "$ZSH/$filepath" ]]; then
+    source "$ZSH/$filepath"
+  fi
+
+  # Unset all aliases that don't appear in the backed up list of aliases
+  if (( disable_aliases )); then
+    local -a disabled
+    # ${var:|array} gets the list of items in var not in array
+    disabled=("${(@k)aliases:|aliases_pre}" "${(@k)galiases:|galiases_pre}")
+    (( $#disabled == 0 )) || unalias "${(@)disabled}"
+  fi
+}
+
 # Load all of the config files in ~/oh-my-zsh that end in .zsh
 # TIP: Add files you don't want in git to .gitignore
 for config_file ("$ZSH"/lib/*.zsh); do
-  custom_config_file="$ZSH_CUSTOM/lib/${config_file:t}"
-  [[ -f "$custom_config_file" ]] && config_file="$custom_config_file"
-  source "$config_file"
+  _omz_source "${config_file:t2}"
 done
 unset custom_config_file
 
 # Load all of the plugins that were defined in ~/.zshrc
 for plugin ($plugins); do
-  if [[ -f "$ZSH_CUSTOM/plugins/$plugin/$plugin.plugin.zsh" ]]; then
-    source "$ZSH_CUSTOM/plugins/$plugin/$plugin.plugin.zsh"
-  elif [[ -f "$ZSH/plugins/$plugin/$plugin.plugin.zsh" ]]; then
-    source "$ZSH/plugins/$plugin/$plugin.plugin.zsh"
-  fi
+  _omz_source "plugins/$plugin/$plugin.plugin.zsh"
 done
 unset plugin