trimming the PWD on the prompt so that it stays on one line

zsh_custom/themes/gnzh.zsh-theme

@@ -6,6 +6,18 @@ autoload -U colors zsh/terminfo # Used in the colour alias below
 colors
 setopt prompt_subst
 
+function limitStringToWidthByMidpoint
+{
+  local string="$1"
+  local width=$2
+  if (( ${#string} > $width )); then
+    local splitnum=$((width/2))
+    echo "$(echo $string | cut -c1-$splitnum) ... $(echo $string | cut -c$((${#string}-$splitnum))-)"
+  else
+    echo $string
+  fi
+}
+
 # make some aliases for the colours: (coud use normal escap.seq's too)
 for color in RED GREEN YELLOW BLUE MAGENTA CYAN WHITE; do
   eval PR_$color='%{$fg[${(L)color}]%}'
@@ -17,11 +29,11 @@ eval PR_BOLD="%{$terminfo[bold]%}"
 if [[ $UID -ge 1000 ]]; then # normal user
   eval PR_USER='${PR_GREEN}%n${PR_NO_COLOR}'
   eval PR_USER_OP='${PR_GREEN}%#${PR_NO_COLOR}'
-  local PR_PROMPT='$PR_NO_COLOR➤ $PR_NO_COLOR'
+  local PR_PROMPT='$PR_NO_COLOR>$PR_NO_COLOR'
 elif [[ $UID -eq 0 ]]; then # root
   eval PR_USER='${PR_RED}%n${PR_NO_COLOR}'
   eval PR_USER_OP='${PR_RED}%#${PR_NO_COLOR}'
-  local PR_PROMPT='$PR_RED➤ $PR_NO_COLOR'
+  local PR_PROMPT='$PR_RED>$PR_NO_COLOR'
 fi
 if [[ ${MY_SHELL_LEVEL:-0} -gt 1 ]]; then
   local PR_PROMPT="$PR_PROMPT [$(($MY_SHELL_LEVEL-1))]"
@@ -36,20 +48,14 @@ fi
 
 local return_code="%(?..%{$PR_RED%}%? ↵%{$PR_NO_COLOR%})"
 
-local user_host='${PR_USER}${PR_CYAN}@${PR_HOST}'
-local current_dir='%{$PR_BOLD$PR_BLUE%}%~%{$PR_NO_COLOR%}'
-local rvm_ruby=''
-if which rvm-prompt &> /dev/null; then
-  rvm_ruby='%{$PR_RED%}‹$(rvm-prompt i v g s)›%{$PR_NO_COLOR%}'
-else
-  if which rbenv &> /dev/null; then
-    rvm_ruby='%{$PR_RED%}‹$(rbenv version | sed -e "s/ (set.*$//")›%{$PR_NO_COLOR%}'
-  fi
-fi
 local git_branch='$(git_prompt_info)%{$PR_NO_COLOR%}'
+local user_host='${PR_USER}${PR_CYAN}@${PR_HOST}'
+local prompty_stuff_so_far="$(git_prompt_info)$(print -P %n)$(print -P %m)"
+local len_so_far=$((${#prompty_stuff_so_far}+20))
+local current_dir='%{$PR_BOLD$PR_BLUE%}$(limitStringToWidthByMidpoint "$(print -P %~)" $((COLUMNS-$len_so_far)))%{$PR_NO_COLOR%}'
 
 #PROMPT="${user_host} ${current_dir} ${rvm_ruby} ${git_branch}$PR_PROMPT "
-PROMPT="╭─${user_host} ${current_dir} ${rvm_ruby} ${git_branch}
+PROMPT="╭─${user_host} ${current_dir} ${git_branch}
 ╰─$PR_PROMPT "
 RPS1="${return_code}"