[zsh] Expand fzf-tab functionality

Will now contain additional functionality for ps, kill, and cd (preview
etc). Will also color things which have LS_COLORS set (done
automatically through lscolors-git file).

bootstrap/packages.txt

@@ -51,6 +51,7 @@ linux-lts
 linux-lts-headers
 littler
 logrotate
+lscolors-git
 lvm2
 lynx
 man-db

zsh/.config/zsh/.zshrc

@@ -14,7 +14,6 @@ fi
 # Set completion style
 # The following lines were added by compinstall
 zstyle ':completion:*' completer _complete _ignored _approximate
-zstyle ':completion:*' list-colors ''
 zstyle ':completion:*' matcher-list '' '+m:{[:lower:]}={[:upper:]} r:|[._-]=** r:|=**'
 zstyle ':completion:*' menu select=1
 zstyle ':completion:*' select-prompt %SScrolling active: current selection at %p%s
@@ -22,14 +21,49 @@ zstyle :compinstall filename "$ZSHCONFDIR/.zshrc"
 # End of lines added by compinstall
 
 # load plugins
+PLUG_FOLDER="/usr/share/zsh/plugins"
 source /usr/share/zsh-theme-powerlevel10k/powerlevel10k.zsh-theme
-source /usr/share/zsh/plugins/fast-syntax-highlighting/fast-syntax-highlighting.plugin.zsh
-source /usr/share/zsh/plugins/zsh-autosuggestions/zsh-autosuggestions.plugin.zsh
-source /usr/share/zsh/plugins/alias-tips/alias-tips.plugin.zsh
-source /usr/share/zsh/plugins/fzf-tab/fzf-tab.plugin.zsh
 source /usr/share/oh-my-zsh/plugins/colored-man-pages/colored-man-pages.plugin.zsh
 source /usr/share/oh-my-zsh/plugins/command-not-found/command-not-found.plugin.zsh
 source /usr/share/nvm/init-nvm.sh
+[ -e $PLUG_FOLDER/fzf-tab/fzf-tab.plugin.zsh ] && source $PLUG_FOLDER/fzf-tab/fzf-tab.plugin.zsh
+# these need to be sourced after fzf-tab
+[ -e $PLUG_FOLDER/fast-syntax-highlighting/fast-syntax-highlighting.plugin.zsh ] && source $PLUG_FOLDER/fast-syntax-highlighting/fast-syntax-highlighting.plugin.zsh
+[ -e $PLUG_FOLDER/alias-tips/alias-tips.plugin.zsh ] && source $PLUG_FOLDER/alias-tips/alias-tips.plugin.zsh
+[ -e $PLUG_FOLDER/zsh-autosuggestions/zsh-autosuggestions.plugin.zsh ] && source $PLUG_FOLDER/zsh-autosuggestions/zsh-autosuggestions.plugin.zsh
+unset PLUG_FOLDER
+
+# simple fzf-tab settings
+FZF_TAB_COMMAND=(
+    fzf
+    --ansi   # Enable ANSI color support, necessary for showing groups
+    --expect='$continuous_trigger' # For continuous completion
+    '--color=hl:$(( $#headers == 0 ? 108 : 255 ))'
+    --nth=2,3 --delimiter='\x00'  # Don't search prefix
+    --layout=reverse --height='${FZF_TMUX_HEIGHT:=75%}'
+    --tiebreak=begin -m --bind=tab:down,btab:up,change:top,ctrl-space:toggle --cycle
+    '--query=$query'   # $query will be expanded to query string at runtime.
+    '--header-lines=$#headers' # $#headers will be expanded to lines of headers at runtime
+)
+zstyle ':fzf-tab:*' command $FZF_TAB_COMMAND
+# default color
+[ -e /usr/share/LS_COLORS/dircolors.sh ] && source /usr/share/LS_COLORS/dircolors.sh
+zstyle ':completion:*' list-colors ${(s.:.)LS_COLORS}
+# some boilerplate code to define the variable `extract` which will be used later
+local extract="
+# trim input(what you select)
+local in=\${\${\"\$(<{f})\"%\$'\0'*}#*\$'\0'}
+# get ctxt for current completion(some thing before or after the current word)
+local -A ctxt=(\"\${(@ps:\2:)CTXT}\")
+# real path
+local realpath=\${ctxt[IPREFIX]}\${ctxt[hpre]}\$in
+realpath=\${(Qe)~realpath}
+"
+# give a preview of commandline arguments when completing `kill`
+zstyle ':completion:*:*:*:*:processes' command "ps -u $USER -o pid,user,comm,cmd -w -w"
+zstyle ':fzf-tab:complete:kill:argument-rest' extra-opts --preview=$extract'ps --pid=$in[(w)1] -o cmd --no-headers -w -w' --preview-window=down:3:wrap
+# give a preview of directory by exa when completing cd
+zstyle ':fzf-tab:complete:cd:*' extra-opts --preview=$extract'exa -1 --color=always $realpath'
 
 # load completion, extended zsh moving syntax, zle edit in vim (or other $EDITOR) possibility
 autoload -Uz compinit zmv edit-command-line
@@ -62,8 +96,6 @@ ENABLE_CORRECTION="true"
 zstyle ':completion:*' accept-exact '*(N)'
 zstyle ':completion:*' use-cache on
 zstyle ':completion:*' cache-path "${XDG_CACHE_HOME:-$HOME/.cache}/zshcompcache"
-# shellcheck disable=SC2016
-zstyle -e ':completion:*:default' list-colors 'reply=("${PREFIX:+=(#bi)($PREFIX:t)*==34=34}:${(s.:.)LS_COLORS}")'
 
 ### history
 ## Set ZSH History defaults