WIP: moving prompt segments out of zsh

shell/prompt_segments

@@ -0,0 +1,48 @@
+#POWERLINE_TRI_LEFT_FULL=''
+#POWERLINE_TRI_LEFT_EMPTY=''
+#POWERLINE_TRI_RIGHT_FULL=''
+#POWERLINE_TRI_RIGHT_EMPTY=''
+#POWERLINE_BRANCH=''
+#POWERLINE_LN=''
+#POWERLINE_LOCK=''
+#POWERLINE_ASIDE='➦'
+
+POWERLINE_TRI_LEFT_FULL='⮂'
+POWERLINE_TRI_LEFT_EMPTY='⮃'
+POWERLINE_TRI_RIGHT_FULL='⮀'
+POWERLINE_TRI_RIGHT_EMPTY='⮁'
+POWERLINE_BRANCH=''
+POWERLINE_LN='⭡'
+POWERLINE_LOCK='⭤'
+POWERLINE_ASIDE='➦'
+
+UNICODE_BOX_VERTICAL_BAR='│'
+
+prompt_is_fancy() {
+    [[ $PROMPT_FANCY -eq 1 ]]
+}
+
+prompt_setup_segments() {
+    if prompt_is_fancy; then
+        SEGMENT_SEPARATOR=$POWERLINE_TRI_RIGHT_FULL
+        RSEGMENT_SEPARATOR=$POWERLINE_TRI_LEFT_FULL
+        SUBSEGMENT_SEPARATOR=$POWERLINE_TRI_RIGHT_EMPTY
+        RSUBSEGMENT_SEPARATOR=$POWERLINE_TRI_LEFT_EMPTY
+    else
+        SEGMENT_SEPARATOR=''
+        RSEGMENT_SEPARATOR=''
+        SUBSEGMENT_SEPARATOR=$UNICODE_BOX_VERTICAL_BAR
+        RSUBSEGMENT_SEPARATOR=$SUBSEGMENT_SEPARATOR
+    fi
+}
+
+prompt_segment() {
+    [[ -z $RPROMPT_SEGMENT ]] && lprompt_segment $@ || rprompt_segment $@
+}
+
+prompt_subsegment() {
+    local sep
+    [[ -z $RPROMPT_SEGMENT ]] && sep=$SUBSEGMENT_SEPARATOR || sep=$RSUBSEGMENT_SEPARATOR
+    echo -n " $sep "
+    [[ -n $1 ]] && print -Pn $1
+}