Substitute characters to non-fancy when there is no multibyte support

.zshrc

@@ -12,17 +12,37 @@ autoload -Uz add-zsh-hook
 LAST_RETURN_VALUE=0
 
 # Characters
-UNSTAGED_CHARACTER="\u26a1"
+if [[ -n $(echo '\u2603' 2>/dev/null) ]] then
-CHANGES_CHARACTER="\u00b1"
+  MULTIBYTE_SUPPORTED="\u2603"
-BRANCH_CHARACTER="\ue0a0"
+fi
-DETACHED_CHARACTER="\u27a6"
-REVISION_CHARACTER="\u2022"
 
-FAILED_CHARACTER="\u2718"
+if [[ -n $MULTIBYTE_SUPPORTED ]] then
-SUCCESS_CHARACTER="\u2714"
+  UNSTAGED_CHARACTER="\u26a1"
-SUPERUSER_CHARACTER="\u26a1"
+  CHANGES_CHARACTER="\u00b1"
-JOBS_CHARACTER="\u2699"
+  BRANCH_CHARACTER="\ue0a0"
-NO_JOBS_CHARACTER="\u2022"
+  DETACHED_CHARACTER="\u27a6"
+  REVISION_CHARACTER="\u2022"
+  FAILED_CHARACTER="\u2718"
+  SUCCESS_CHARACTER="\u2714"
+  SUPERUSER_CHARACTER="\u26a1"
+  JOBS_CHARACTER="\u2699"
+  NO_JOBS_CHARACTER="\u2022"
+  SEGMENT_SEPARATOR_FORWARD="\ue0b0"
+  SEGMENT_SEPARATOR_BACKWARD="\ue0b2"
+else
+  UNSTAGED_CHARACTER="!"
+  CHANGES_CHARACTER="*"
+  BRANCH_CHARACTER="b"
+  DETACHED_CHARACTER="d"
+  REVISION_CHARACTER="r"
+  FAILED_CHARACTER="!"
+  SUCCESS_CHARACTER="+"
+  SUPERUSER_CHARACTER="#"
+  JOBS_CHARACTER="O"
+  NO_JOBS_CHARACTER="."
+  SEGMENT_SEPARATOR_FORWARD=""
+  SEGMENT_SEPARATOR_BACKWARD=""
+fi
 
 
 #---------------------------------- Helpers -----------------------------------
@@ -148,10 +168,6 @@ export SAVEHIST=1000000
 
 CURRENT_BG='NONE'
 
-# Characters
-SEGMENT_SEPARATOR_FORWARD="\ue0b0"
-SEGMENT_SEPARATOR_BACKWARD="\ue0b2"
-
 prompt_segment() {
   local direction newbg newfg text
   direction="$1"