Fancy, re-configurable prompt.

.bashrc_prompt.sh

# The code below provides an elaborate system for composing custom prompts.
# Of these the `myprompt`, `devprompt` and `longprompt` are the most useful.

# Fancy, reconfigurable prompt.
multiprompt () {
  parse_git_branch () {
    if [[ -n $promptgit ]] && which git 2>&1 > /dev/null; then
      ref=$(git symbolic-ref HEAD 2> /dev/null) || return 0
      ref="${ref#refs/heads/}"
      if [[ $ref != 'master' ]]; then
          echo -n "^${ref#refs/heads/}"
      fi
    fi
  }

  exit_value_indicator () {
    for stat in ${PIPESTATUS[*]}; do stat_sum=$(($stat_sum + $stat)); done
    [ $stat_sum == 0 ] && echo ':)' || echo ':('
  }

  rvm_info_for_prompt () {
    if [[ -n $promptrvm ]] && type -t rvm-prompt > /dev/null; then
      rvm_result="$(rvm-prompt)"
      if [[ "${rvm_result}" != 'system' ]] && [[ "${rvm_result}" != '' ]]; then echo " ∴ ${rvm_result}"; fi
    fi
  }

  path_info_for_prompt () {
    if [[ -n $promptlong ]]; then
      echo "\w"
    else
      echo "\W"
    fi
  }

  name_info_for_prompt () {
    if [[ -n $promptless ]]; then
      echo ''
    else
      echo '${debian_chroot:+($debian_chroot)}\u@\h:'
    fi
  }

  misc_info_for_prompt () {
    if [[ -n $promptless ]]; then
      echo ''
    else
      echo ' #\! \A'
    fi
  }

  export PROMPT_COMMAND='export PS1="$(name_info_for_prompt)$(path_info_for_prompt)\$(parse_git_branch)\$(rvm_info_for_prompt)$(misc_info_for_prompt) \$(exit_value_indicator) "'
  eval "$PROMPT_COMMAND"
}
multiprompt # Activate

# Reset prompt to defaults, e.g.
# myusername@mycomputer:myproject #28 23:52 :) 
myprompt () {
    unset promptgit
    unset promptrvm
    unset promptlong
    unset promptless
    multiprompt
}

# Toggle visibility of RVM information, e.g.
# myusername@mycomputer:myproject ∴ ree-1.8.7-2011.03@everything #29 23:52 :) 
rvmprompt () {
    if [[ -z $promptrvm ]]; then
        export promptrvm=1
    else
        unset promptrvm
    fi
    multiprompt
}

# Toggle visibility of Git branch information, e.g.
# myusername@mycomputer:myproject^mybranch #30 23:52 :)
gitprompt () {
    if [[ -z $promptgit ]]; then
        export promptgit=1
    else
        unset promptgit
    fi
    multiprompt
}

# Toggle display of full path name, e.g.
# myusername@mycomputer:~/workspace/myproject #32 23:53 :) 
longprompt () {
    if [[ -z $promptlong ]]; then
        export promptlong=1
    else
        unset promptlong
    fi
    multiprompt
}

# Toggle display of extra information, e.g.
# myproject :)
lessprompt () {
    if [[ -z $promptless ]]; then
        export promptless=1
    else
        unset promptless
    fi
    multiprompt
}

# Show prompt with dev information, e.g.
# myproject^mybranch ∴ ree-1.8.7-2011.03@everything :) 
devprompt () {
    export promptless=1
    unset promptlong
    export promptgit=1
    export promptrvm=1
    multiprompt
}

# Simple, with truncated path, e.g
# myusername@mycomputer:mypath 12 >>
simpleprompt () {
    export PS1="\u@\h:\W/ \! >> "
}

.bashrc~prompt

# The code below provides an elaborate system for composing custom prompts.
# Of these the `myprompt`, `devprompt` and `longprompt` are the most useful.

# Fancy, reconfigurable prompt.
multiprompt () {
  parse_git_branch () {
    if [[ -n $promptgit ]] && which git 2>&1 > /dev/null; then
      ref=$(git symbolic-ref HEAD 2> /dev/null) || return 0
      ref="${ref#refs/heads/}"
      if [[ $ref != 'master' ]]; then
          echo -n "^${ref#refs/heads/}"
      fi
    fi
  }

  exit_value_indicator () {
    for stat in ${PIPESTATUS[*]}; do stat_sum=$(($stat_sum + $stat)); done
    [ $stat_sum == 0 ] && echo ':)' || echo ':('
  }

  rvm_info_for_prompt () {
    if [[ -n $promptrvm ]] && type -t rvm-prompt > /dev/null; then
      rvm_result="$(rvm-prompt)"
      if [[ "${rvm_result}" != 'system' ]] && [[ "${rvm_result}" != '' ]]; then echo " ∴ ${rvm_result}"; fi
    fi
  }

  path_info_for_prompt () {
    if [[ -n $promptlong ]]; then
      echo "\w"
    else
      echo "\W"
    fi
  }

  name_info_for_prompt () {
    if [[ -n $promptless ]]; then
      echo ''
    else
      echo '${debian_chroot:+($debian_chroot)}\u@\h:'
    fi
  }

  misc_info_for_prompt () {
    if [[ -n $promptless ]]; then
      echo ''
    else
      echo ' #\! \A'
    fi
  }

  export PROMPT_COMMAND='export PS1="$(name_info_for_prompt)$(path_info_for_prompt)\$(parse_git_branch)\$(rvm_info_for_prompt)$(misc_info_for_prompt) \$(exit_value_indicator) "'
  eval "$PROMPT_COMMAND"
}
multiprompt # Activate

# Reset prompt to defaults, e.g.
# myusername@mycomputer:myproject #28 23:52 :) 
myprompt () {
    unset promptgit
    unset promptrvm
    unset promptlong
    unset promptless
    multiprompt
}

# Toggle visibility of RVM information, e.g.
# myusername@mycomputer:myproject ∴ ree-1.8.7-2011.03@everything #29 23:52 :) 
rvmprompt () {
    if [[ -z $promptrvm ]]; then
        export promptrvm=1
    else
        unset promptrvm
    fi
    multiprompt
}

# Toggle visibility of Git branch information, e.g.
# myusername@mycomputer:myproject^mybranch #30 23:52 :)
gitprompt () {
    if [[ -z $promptgit ]]; then
        export promptgit=1
    else
        unset promptgit
    fi
    multiprompt
}

# Toggle display of full path name, e.g.
# myusername@mycomputer:~/workspace/myproject #32 23:53 :) 
longprompt () {
    if [[ -z $promptlong ]]; then
        export promptlong=1
    else
        unset promptlong
    fi
    multiprompt
}

# Toggle display of extra information, e.g.
# myproject :)
lessprompt () {
    if [[ -z $promptless ]]; then
        export promptless=1
    else
        unset promptless
    fi
    multiprompt
}

# Show prompt with dev information, e.g.
# myproject^mybranch ∴ ree-1.8.7-2011.03@everything :) 
devprompt () {
    export promptless=1
    unset promptlong
    export promptgit=1
    export promptrvm=1
    multiprompt
}

# Simple, with truncated path, e.g
# myusername@mycomputer:mypath 12 >>
simpleprompt () {
    export PS1="\u@\h:\W/ \! >> "
}