overhaul prompt management; make it easier to add/remove things to {,r}prompt over time

base/precmd.zsh

@@ -4,4 +4,4 @@ function precmd_tab_directory () {
         print -Pn "\e]0;%n@%m: %~\a"
 }
 
-precmd_functions+="precmd_tab_directory"
+precmd_functions+="precmd_tab_directory"

base/prompt.zsh

@@ -0,0 +1,24 @@
+typeset -ag prompt_functions
+typeset -ag rprompt_functions
+
+function prompt_builder () {
+        result=""
+        for prompt_func in $prompt_functions; do
+                result="${result}$($prompt_func) "
+        done
+        # prompt will always end with "% " (or "# " if we're somehow root)
+        result="${result}%#%{$reset_color%} "
+        print "${result}"
+}
+
+function rprompt_builder () {
+        result=""
+        for rprompt_func in $rprompt_functions; do
+                result="$($rprompt_func) ${result}"
+        done
+        result="${result}%{$reset_color%}"
+        print "${result}"
+}
+
+PROMPT='$(prompt_builder)'
+RPROMPT='$(rprompt_builder)'