tmux: detabify source code

Also changes the tmux detection test to do an early exit if tmux is absent,
to reduce the indentation level of the main body of code.

plugins/tmux/tmux.plugin.zsh

@@ -10,8 +10,11 @@ alias tksv='tmux kill-server'
 alias tkss='tmux kill-session -t'
 
 # Only run if tmux is actually installed
-if which tmux &> /dev/null
-	then
+if ! which tmux &> /dev/null; then
+  print "zsh tmux plugin: tmux not found. Please install tmux before using this plugin."
+  return 1
+fi
+
 # Configuration variables
 #
 # Automatically start tmux
@@ -41,16 +44,14 @@ if which tmux &> /dev/null
 local zsh_tmux_plugin_path="$(cd "$(dirname "$0")" && pwd)"
 
 # Determine if the terminal supports 256 colors
-	if [[ `tput colors` == "256" ]]
-	then
+if [[ `tput colors` == "256" ]]; then
   export ZSH_TMUX_TERM=$ZSH_TMUX_FIXTERM_WITH_256COLOR
 else
   export ZSH_TMUX_TERM=$ZSH_TMUX_FIXTERM_WITHOUT_256COLOR
 fi
 
 # Set the correct local config file to use.
-    if [[ "$ZSH_TMUX_ITERM2" == "false" ]] && [[ -f $HOME/.tmux.conf || -h $HOME/.tmux.conf ]]
-	then
+if [[ "$ZSH_TMUX_ITERM2" == "false" ]] && [[ -f $HOME/.tmux.conf || -h $HOME/.tmux.conf ]]; then
   #use this when they have a ~/.tmux.conf
   export _ZSH_TMUX_FIXED_CONFIG="$zsh_tmux_plugin_path/tmux.extra.conf"
 else
@@ -59,15 +60,12 @@ if which tmux &> /dev/null
 fi
 
 # Wrapper function for tmux.
-	function _zsh_tmux_plugin_run()
-	{
+function _zsh_tmux_plugin_run() {
   # We have other arguments, just run them
-		if [[ -n "$@" ]]
-		then
+  if [[ -n "$@" ]]; then
     \tmux $@
   # Try to connect to an existing session.
-		elif [[ "$ZSH_TMUX_AUTOCONNECT" == "true" ]]
-		then
+  elif [[ "$ZSH_TMUX_AUTOCONNECT" == "true" ]]; then
     \tmux `[[ "$ZSH_TMUX_ITERM2" == "true" ]] && echo '-CC '` attach || \tmux `[[ "$ZSH_TMUX_ITERM2" == "true" ]] && echo '-CC '` `[[ "$ZSH_TMUX_FIXTERM" == "true" ]] && echo '-f '$_ZSH_TMUX_FIXED_CONFIG` new-session
     [[ "$ZSH_TMUX_AUTOQUIT" == "true" ]] && exit
       # Just run tmux, fixing the TERM variable if requested.
@@ -84,15 +82,10 @@ if which tmux &> /dev/null
 alias tmux=_zsh_tmux_plugin_run
 
 # Autostart if not already in tmux and enabled.
-	if [[ ! -n "$TMUX" && "$ZSH_TMUX_AUTOSTART" == "true" ]]
-	then
+if [[ ! -n "$TMUX" && "$ZSH_TMUX_AUTOSTART" == "true" ]]; then
   # Actually don't autostart if we already did and multiple autostarts are disabled.
-		if [[ "$ZSH_TMUX_AUTOSTART_ONCE" == "false" || "$ZSH_TMUX_AUTOSTARTED" != "true" ]]
-		then
+  if [[ "$ZSH_TMUX_AUTOSTART_ONCE" == "false" || "$ZSH_TMUX_AUTOSTARTED" != "true" ]]; then
     export ZSH_TMUX_AUTOSTARTED=true
     _zsh_tmux_plugin_run
   fi
 fi
-else
-	print "zsh tmux plugin: tmux not found. Please install tmux before using this plugin."
-fi