How do I show the git branch with colours in Bash prompt?

This snippet:

# Add git branch if its present to PS1

parse_git_branch() {
 git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/(\1)/'
}
if [ "$color_prompt" = yes ]; then
 PS1='${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[01;31m\]$(parse_git_branch)\[\033[00m\]\$ '
else
 PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w$(parse_git_branch)\$ '
fi

Is meant to replace the default prompt definition:

if [ "$color_prompt" = yes ]; then
    PS1='${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ '
else
    PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w\$ '
fi

Which ends with:

unset color_prompt force_color_prompt

The .bashrc you posted shows you're adding it after the default prompt definition and unset color_prompt force_color_prompt (line #64).

Either replace the default prompt definition with the snippet or leave your ~/.bashrc as it is and comment the default prompt definition along with unset color_prompt force_color_prompt on line #64:

---

So part of your .bashrc could look like

parse_git_branch() {
 git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/(\1)/'
}
if [ "$color_prompt" = yes ]; then
 PS1='${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[01;31m\] $(parse_git_branch)\[\033[00m\]\$ '
else
 PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w$(parse_git_branch)\$ '
fi
# THE SIX LINES BELOW are the default prompt and the unset (which were in the original .bashrc)
#if [ "$color_prompt" = yes ]; then
#    PS1='${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ '
#else
#    PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w\$ '
#fi
#unset color_prompt force_color_prompt

Ubuntu: Show your branch name on your terminal

Add these lines in your ~/.bashrc file

# Show git branch name
force_color_prompt=yes
color_prompt=yes
parse_git_branch() {
 git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/(\1)/'
}
if [ "$color_prompt" = yes ]; then
 PS1='${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[01;31m\]$(parse_git_branch)\[\033[00m\]\$ '
else
 PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w$(parse_git_branch)\$ '
fi
unset color_prompt force_color_prompt

Reload the .bashrc file with this command:

$ source ~/.bashrc

For now, I followed this https://gist.github.com/eliotsykes/47516b877f5a4f7cd52f and working, liking it so far, though I'm planning to customize it further.

In Terminal

mkdir ~/.bash

Copy the raw git-prompt.sh file from git contrib in to the ~/.bash directory: https://github.com/git/git/blob/master/contrib/completion/git-prompt.sh

Inside ~/.bashrc or ~/.bash_profile (choose the file where you normally put any bash customizations/setup), add the lines:

source ~/.bash/git-prompt.sh # Show git branch name at command prompt
export GIT_PS1_SHOWCOLORHINTS=true # Option for git-prompt.sh to show branch name in color

# Terminal Prompt:
# Include git branch, use PROMPT_COMMAND (not PS1) to get color output (see git-prompt.sh for more)
export PROMPT_COMMAND='__git_ps1 "\w" "\n\\\$ "' # Git branch (relies on git-prompt.sh)

As long as you're inside a git repo, your Bash prompt should now show the current git branch in color signifying if its got uncommitted changes.