Extend prompt command instead of replacing it

README.md

@@ -2,10 +2,13 @@
 
 Clone this repo:
 ```
-git clone git@uncensored.hu:thayol/bash-prompt.git ~/.bash-prompt
+git clone https://git.uncensored.hu/thayol/bash-prompt.git ~/.bash-prompt
 ```
 
 Add this to your `.bashrc`:
 ```
 . $HOME/.bash-prompt/prompt.sh
 ```
+
+Optionally create a `.env` file (in the repo root) to customize the look.
+You can find the available variables in `prompt.sh`.

prompt.sh

@@ -6,20 +6,31 @@ PROMPT_HOST_COLOR="255;255;255"
 PROMPT_DIR_COLOR="100;149;237"
 PROMPT_VPN_NAME=""
 PROMPT_VPN_COLOR="255;255;255"
+PROMPT_HIGHLIGHTED_BRANCH_COLOR="255;84;84"
 
 _prompt_dir="${BASH_SOURCE[0]%/*}"
 [[ -f "$_prompt_dir/.env" ]] && . "$_prompt_dir/.env"
 
 __prompt_git() {
+  local color
+  local color_reset
   local branch
+  color=""
+  color_reset=""
   branch=$(git branch --show-current 2>/dev/null) || return
   [[ -z $branch ]] && return
-  echo -n " (${branch})"
+
+  if [[ $branch =~ main|master ]] && [[ -n $PROMPT_HIGHLIGHTED_BRANCH_COLOR ]]; then
+    color="\[\e[38;2;${PROMPT_HIGHLIGHTED_BRANCH_COLOR}m\]"
+    color_reset="\[\e[0m\]"
+  fi
+
+  echo -n " (${color}${branch}${color_reset})"
 }
 
 __prompt_vpn() {
   [[ -z $PROMPT_VPN_NAME ]] && return
-  nmcli -f GENERAL.STATE con show "$PROMPT_VPN_NAME" &>/dev/null || return
+  [[ -z $(nmcli -f GENERAL.STATE con show "$PROMPT_VPN_NAME") ]] && return
   echo -n " → \[\e[38;2;${PROMPT_VPN_COLOR}m\]${PROMPT_VPN_NAME}\[\e[0m\]"
 }
 
@@ -46,4 +57,13 @@ __prompt_build() {
   PS1+=' \$ '
 }
 
-PROMPT_COMMAND=__prompt_build
+case ";${PROMPT_COMMAND-};" in
+*";__prompt_build;"*) ;;
+*)
+  if [[ -n ${PROMPT_COMMAND-} ]]; then
+    PROMPT_COMMAND="${PROMPT_COMMAND}; __prompt_build"
+  else
+    PROMPT_COMMAND=__prompt_build
+  fi
+  ;;
+esac