Refactored theme

themes/agnoster.zsh-theme

-# Theme by [agnoster](https://github.com/agnoster)
-# See https://gist.github.com/3712874
+### Segment drawing
+# A few utility functions to make it easy and re-usable to draw segmented prompts
 
-ZSH_THEME_GIT_PROMPT_DIRTY='±'
+CURRENT_BG=''
+SEGMENT_SEPARATOR='⮀'
+function segment_start() {
+  local bg=$1
+  local fg=$2
+  if [[ -n $CURRENT_BG && $bg != $CURRENT_BG ]]; then
+    echo -n " %{%K{$bg}%F{$CURRENT_BG}%}$SEGMENT_SEPARATOR"
+  else
+    echo -n "%{%K{$bg}%}"
+  fi
+  [[ -n $fg ]] && fg="%F{$fg}" || fg="%f"
+  echo -n "%{$fg%} "
+  CURRENT_BG=$bg
+}
 
-function _git_prompt_info() {
-  ref=$(git symbolic-ref HEAD 2> /dev/null) || ref="➦ $(git show-ref --head -s --abbrev |head -n1 2> /dev/null)"
-  echo "${ref/refs\/heads\//⭠ }$(parse_git_dirty)"
+function segment_stop() {
+  if [[ -n $CURRENT_BG ]]; then
+    echo -n " %{%k%F{$CURRENT_BG}%}$SEGMENT_SEPARATOR"
+  else
+    echo -n "%{%k%}"
+  fi
+  echo -n "%{%f%}"
+  CURRENT_BG=''
 }
 
-function _git_info() {
-  if $(git rev-parse --is-inside-work-tree >/dev/null 2>&1); then
-    local BG_COLOR=green
-    if [[ -n $(parse_git_dirty) ]]; then
-      BG_COLOR=yellow
+### Prompt components
+# Each component will draw itself, and hide itself if no information needs to be shown
+
+function prompt_context() {
+  local user=`whoami`
+
+  if [[ ("$user" != "$DEFAULT_USER") || (-n "$SSH_CLIENT") ]]; then
+    segment_start black
+    #echo -n "%{%F{yellow}%}$user%{%F{gray}%}@%{%F{green}%}%m%{%f%}"
+    echo -n "%(!.%{%F{yellow}%}.)$user@%m"
   fi
-    echo "%{%K{$BG_COLOR}%}⮀%{%F{black}%} $(_git_prompt_info) %{%F{$BG_COLOR}%K{blue}%}⮀"
+}
+
+function prompt_git() {
+  if $(git rev-parse --is-inside-work-tree >/dev/null 2>&1); then
+    ZSH_THEME_GIT_PROMPT_DIRTY='±'
+    local dirty=$(parse_git_dirty)
+    local ref
+    ref=$(git symbolic-ref HEAD 2> /dev/null) || ref="➦ $(git show-ref --head -s --abbrev |head -n1 2> /dev/null)"
+    if [[ -n $dirty ]]; then
+      segment_start yellow black
     else
-    echo "%{%K{blue}%}⮀"
+      segment_start green black
+    fi
+    echo -n "${ref/refs\/heads\//⭠ }$dirty"
+  fi
+}
+
+function prompt_dir() {
+  segment_start blue white
+  echo -n '%~'
+}
+
+function prompt_status() {
+  local symbols
+  symbols=()
+  [[ $RETVAL -ne 0 ]] && symbols+="%{%F{red}%}✘"
+  [[ $UID -eq 0 ]] && symbols+="%{%F{yellow}%}⚡"
+  jobs=$(jobs -l | wc -l)
+  [[ $jobs -gt 0 ]] && symbols+="%{%F{cyan}%}⚙"
+  if [[ -n "$symbols" ]]; then
+    segment_start black white
+    echo -n "${symbols}"
   fi
 }
 
-PROMPT_HOST='%{%b%F{gray}%K{black}%} %(?.%{%F{green}%}✔.%{%F{red}%}✘)%{%F{gray}%} %m %{%F{black}%}'
-PROMPT_DIR='%{%F{white}%} %1~ '
-PROMPT_SU='%(!.%{%k%F{blue}%K{black}%}⮀%{%F{yellow}%} ⚡ %{%k%F{black}%}.%{%k%F{blue}%})⮀%{%f%k%b%}'
+## Main prompt
+function build_prompt() {
+  RETVAL=$?
+  prompt_status
+  prompt_context
+  prompt_dir
+  prompt_git
+  segment_stop
+}
 
 PROMPT='%{%f%b%k%}
-$PROMPT_HOST$(_git_info)$PROMPT_DIR$PROMPT_SU '
+$(build_prompt) '