themes/powerline-icon: Fix icon for successful execution (#516)

* themes/powerline-icon: Correct error

An error in one of the powerline functions has been corrected, which
was preventing the display of the icon for a successfully executed
command.

* themes/THEMES: Add powerline-icon

themes/THEMES.md

@@ -176,6 +176,10 @@
 
 [![](powerline/powerline-dark.png)](powerline/powerline-dark.png)
 
+## `powerline-icon`
+
+[![](powerline-icon/powerline-icon-dark.png)](powerline-icon/powerline-icon-dark.png)
+
 ## `powerline-light`
 
 [![](powerline-light/powerline-light.png)](powerline-light/powerline-light.png)

themes/powerline/powerline.base.sh

@@ -192,7 +192,11 @@ function __powerline_prompt_command {
     local info="$(__powerline_${segment}_prompt)"
     [[ -n "${info}" ]] && __powerline_left_segment "${info}"
   done
-  [[ "${last_status}" -ne 0 ]] && __powerline_left_segment $(__powerline_last_status_prompt ${last_status})
+
+  ## info status prompt ##
+  local info="$(__powerline_last_status_prompt ${last_status})"
+  [[ -n "${info}" ]] && __powerline_left_segment "${info}"
+
   [[ -n "${LEFT_PROMPT}" ]] && LEFT_PROMPT+="$(set_color ${LAST_SEGMENT_COLOR} -)${separator_char}${_omb_prompt_normal}"
 
   PS1="${LEFT_PROMPT} "