zsh: change prompt color based on current fronter

zsh/.config/zsh/config.d/00_query_pk_front_color.zsh

@@ -0,0 +1,14 @@
+# fetches the color of the currently fronting PK member
+function fetch_fronter_color {
+	[ -n "$PLURALKIT_API_TOKEN" ] || return 1
+	[ -n "$PLURALKIT_SYSTEM_ID" ] || return 1
+	endpoint="https://api.pluralkit.me/v2/systems/$PLURALKIT_SYSTEM_ID/fronters"
+	color=$(curl -sH "Authorization: $PLURALKIT_API_TOKEN" "$endpoint" | jq -r ".members[0].color // empty")
+	[ -n "$color" ] && echo "#$color"
+}
+
+# fetch the fronter color every precmd and export it for the prompt
+precmd_functions+="set_fronter_color"
+function set_fronter_color {
+	export fronter_color="$(eval_with_secrets fetch_fronter_color)"
+}

zsh/.config/zsh/config.d/00_secrets.zsh

@@ -0,0 +1,5 @@
+function eval_with_secrets {
+	PLURALKIT_API_TOKEN="" \
+	PLURALKIT_SYSTEM_ID="" \
+	eval $@
+}

zsh/.config/zsh/config.d/30_prompt.zsh

@@ -9,7 +9,7 @@ autoload -Uz vcs_info
 precmd_functions+="vcs_info"
 
 # Prompt shows hostname if connected to a remote or if root
-PROMPT="%B$([ -n "$is_remote" ] || [ "$EUID" = 0 ] && echo "%F{magenta}%m%f ")%F{$([ "$EUID" = 0 ] && echo "red" || echo "cyan")}%n%f %F{blue}%~%f%b \${vcs_info_msg_0_}%B%#%b "
+PROMPT="%B$([ -n "$is_remote" ] || [ "$EUID" = 0 ] && echo "%F{magenta}%m%f ")%F{$([ "$EUID" = 0 ] && echo "red" || echo "\${fronter_color:-cyan}")}%n%f %F{blue}%~%f%b \${vcs_info_msg_0_}%B%#%b "
 
 # The line before the prompt is used by RPROMPT for information about the previous command - leave space
 NEWLINE=$'\n'