zsh: use array for colors in git prompt

config/zsh/prompt.zsh

@@ -84,14 +84,16 @@ fs_prompt_pwd() {
 
 fs_prompt_git() {
   typeset -A icons=([branch]="$1" [tag]="$2" [detached]="$3")
-  local branch_color="$4"
-  local ahead_color="$5"
-  local behind_color="$6"
-  local untracked_color="$7"
-  local staged_color="$8"
-  local dirty_color="$9"
-  local conflict_color="$10"
-  local sep_color="$11"
+  typeset -A fg=(
+    [branch]="$4"
+    [ahead]="$5"
+    [behind]="$6"
+    [untracked]="$7"
+    [staged]="$8"
+    [dirty]="$9"
+    [conflict]="$10"
+    [sep]="$11"
+  )
 
   local gitstatus  # local swallows git's exit code if not on its own line
   gitstatus=$(command git status --porcelain -b 2>/dev/null) || return
@@ -156,22 +158,22 @@ fs_prompt_git() {
 
   local result=()
   {
-    local sep="${sep_color}"
+    local sep="${fg[sep]}"
     local tracking=()
-    (($ahead))      && tracking+="${ahead_color}${ahead}"      # ↑
-    (($behind))     && tracking+="${behind_color}${behind}"    # ↓
+    (($ahead))      && tracking+="${fg[ahead]}${ahead}"      # ↑
+    (($behind))     && tracking+="${fg[behind]}${behind}"    # ↓
     (($#tracking))  && result+="${(pj:$sep:)tracking}"
 
-    (($conflicts))  && result+="${conflict_color} %{%B%}${conflicts}%{%b%}"
+    (($conflicts))  && result+="${fg[conflict]} %{%B%}${conflicts}%{%b%}"
 
     local state=()
-    (($staged))     && state+="${staged_color}+${staged}"
-    (($dirty))      && state+="${dirty_color}${dirty}✶"
+    (($staged))     && state+="${fg[staged]}+${staged}"
+    (($dirty))      && state+="${fg[dirty]}${dirty}✶"
     (($#state))     && result+="${(pj:$sep:)state}"
 
-    (($untracked))  && result+="${untracked_color}${untracked}?"
+    (($untracked))  && result+="${fg[untracked]}${untracked}?"
   }
-  print "${branch_color}${branch} ${(j: :)result}"
+  print "${fg[branch]}${branch} ${(j: :)result}"
 }
 
 fs_prompt_virtualenv() {