update bashrc to build PS1 a bit more clearly

.bashrc

@@ -10,8 +10,15 @@ HISTCONTROL=ignoreboth # don't put duplicate lines or lines starting with space
 HISTSIZE=1000
 HISTFILESIZE=2000
 
-# PS1='[\u@\h \W]\$ '
-PS1='\[\033[01;35m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ '
+source /usr/share/bash-completion/completions/git
+source /usr/share/git/completion/git-prompt.sh
+
+PS1=
+PS1="$PS1"'\[\033[01;35m\]\u@\h'        # user@host
+PS1="$PS1"'\[\033[00m\]:'               # seperator
+PS1="$PS1"'\[\033[01;34m\]\w'           # working directory
+PS1="$PS1"'\[\033[01;93m\]$(__git_ps1)' # github branch
+PS1="$PS1"'\[\033[00m\]\$ '             # shell sign
 
 export GCC_COLORS='error=01;31:warning=01;35:note=01;36:caret=01;32:locus=01:quote=01' # coloured GCC warnings and errors
 
@@ -39,7 +46,6 @@ alias mv='mv -i'
 alias py3='python3'
 alias hgit="git --git-dir=$HOME/.home-conf.git --work-tree=$HOME"
 
-source /usr/share/bash-completion/completions/git
 __git_complete hgit __git_main
 
 # opt out of dotnet's telenetry