How to build a temporary context for taskwarrior

.bashrc

#I added a temporary context for taskwarrior using some bash commands and aliases.
#Here I show how it works.
#
#I wanted my bash prompt to show my temporary context, and I wanted that temporary context to be easily set and reset.

#you may find this at /usr/share/bash-completion/completions instead of in your home directory
source ~/.bash_completion.d/task.sh
alias task='task $DEFAULT_TASK_OPTIONS'

#short for task add, automatically marking it as something new ("inbox") and for something not work-related
alias ta='task add +home +inbox $DEFAULT_TASK_OPTIONS'
#same for work-related
alias taw='task add +work +inbox $DEFAULT_TASK_OPTIONS'

#short for task-set-context, call it e.g. "tsc project:camper_trailer" to set a context or without params to reset it
function tsc {
  export DEFAULT_TASK_OPTIONS=$(echo "$@" | xargs)
}
export -f tsc
function _my_prompt_command {
  #LP_PS1_PREFIX is from liquidprompt. You could manipulate your PS1 variable directly here instead
  if [ -n "$DEFAULT_TASK_OPTIONS" ]; then
    LP_PS1_PREFIX="[\e[33m$DEFAULT_TASK_OPTIONS\e[39m] "
  else
    LP_PS1_PREFIX=""
  fi
  _lp_set_prompt
}
export -f _my_prompt_command
export PROMPT_COMMAND=_my_prompt_command

#make sure we have the nice auto-completion for e.g. projects and tags also for our aliases
complete -o nospace -F _task ta
complete -o nospace -F _task taw
complete -o nospace -F _task tsc

bash-session-example

lena@lena-XPS-13-9360:~ $ tsc project:demo
[project:demo] lena@lena-XPS-13-9360:~ $ task add demotask
Created task 216.
The project 'demo' has changed.  Project 'demo' is 0% complete (1 task remaining).
[project:demo] lena@lena-XPS-13-9360:~ $ task
[task next ( project:demo )]

ID  Age Project Description Urg 
216 4s  demo    demotask       1

1 task
There are local changes.  Sync required.
[project:demo] lena@lena-XPS-13-9360:~ $ task add demotask 2
Created task 217.
The project 'demo' has changed.  Project 'demo' is 0% complete (2 of 2 tasks remaining).
[project:demo] lena@lena-XPS-13-9360:~ $ task
[task next ( project:demo )]

ID  Age Project Description Urg 
216 18s demo    demotask       1
217 2s  demo    demotask 2     1

2 tasks
There are local changes.  Sync required.
[project:demo] lena@lena-XPS-13-9360:~ $ tsc demo2
[demo2] lena@lena-XPS-13-9360:~ $ task
[task next ( demo2 )]
No matches.
There are local changes.  Sync required.
[demo2] lena@lena-XPS-13-9360:~ $ tsc
lena@lena-XPS-13-9360:~ $