Zsh: Improve completions

- Clean some oh-my-zsh variables
- Move completions to the top
- Re-add functionality from oh-my-zsh:
  - Hyphen- and case-insensitive, partial-word and substring completion
  - bashcompinit

.config/zsh/.zshrc

@@ -1,9 +1,30 @@
 function()                      # Keep local variables in here.
 {
 
-# Initialize completions.
-autoload -Uz compinit
-compinit -d "${ZSH_CACHE_DIR}/.zcompdump"
+############################## Completion ######################################
+
+zmodload -i zsh/complist
+autoload -Uz compinit && compinit -d "${ZSH_CACHE_DIR}/zcompdump"
+
+setopt ALWAYS_TO_END COMPLETE_IN_WORD GLOB_COMPLETE
+
+# Configure completions.
+zstyle ':completion:*' use-cache on
+zstyle ':completion::complete:*' cache-path "${ZSH_CACHE_DIR}/zcompcache"
+zstyle ':completion:*' menu select
+zstyle ':completion:*' completer _complete _ignored _approximate
+# Next line is hyphen- and case-insensitive, partial-word and substring
+# completion, copied from oh-my-zsh.
+zstyle ':completion:*' matcher-list 'm:{a-zA-Z-_}={A-Za-z_-}' 'r:|=*' 'l:|=* r:|=*'
+zstyle ':completion:*' file-sort modification      # access didn't work.
+zstyle ':completion:complete:*' sort false         # Needed for file-sort.
+zstyle ':completion:complete:*:options' sort false # Don't sort command options.
+zstyle ':completion:*:*:*:*:processes' \
+       command "ps -u $USER -o pid,user,comm,cmd -w -w"
+
+compdef '_dispatch git git' config # git completions for config.
+
+autoload -Uz +X bashcompinit && bashcompinit
 
 # Directory options
 setopt AUTO_CD AUTO_PUSHD PUSHD_IGNORE_DUPS PUSHD_MINUS
@@ -31,13 +52,6 @@ add-zsh-hook zshaddhistory _my_import_history_zshaddhistory
 
 ############################## Plugins #########################################
 
-# Hyphen-insensitive completion. Case sensitive completion must be off. _ and -
-# will be interchangeable.
-HYPHEN_INSENSITIVE="true"
-
-# Enable command auto-correction.
-ENABLE_CORRECTION="true"
-
 # https://github.com/zsh-users/zsh-syntax-highlighting/blob/master/docs/highlighters.md
 export ZSH_HIGHLIGHT_HIGHLIGHTERS=(main brackets)
 
@@ -77,22 +91,6 @@ zstyle ':fzf-tab:complete:man:*' fzf-preview 'whatis -l $word | cut -d- -f2,3,4,
 
 async_init
 
-############################## Completion ######################################
-
-setopt ALWAYS_TO_END COMPLETE_IN_WORD
-
-# Configure completions.
-zstyle ':completion::complete:*' cache-path "${ZSH_CACHE_DIR}/.zcompcache"
-zstyle ':completion:*' completer _complete _ignored _approximate
-zstyle ':completion:*' file-sort modification # access didn't work.
-# Not sure why the next line is needed. Maybe fzf-tab is setting it to true?
-zstyle ':completion:complete:*' sort false         # Needed for file-sort.
-zstyle ':completion:complete:*:options' sort false # Don't sort command options.
-zstyle ':completion:*:*:*:*:processes' \
-       command "ps -u $USER -o pid,user,comm,cmd -w -w"
-
-compdef '_dispatch git git' config # git completions for config.
-
 ################################################################################
 
 function generate_terminfo_24bit()