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jest.function.bash

# Usage: stick it in your .bashrc or other startup file and then 
#   jest list
#   jest [--updateSnapshot] {SomeTestNamePrefix}
#   jest [--updateSnapshot]
# 
# The list argument presents a selection list, from which you may pick one test to execute. 
# The second form runs the tests whose name is a leftmost match to the given prefix.
# The unqualified jest cli executes all tests under ./jest/*
# The --updateSnapshot option will update the html snapshot, which is recommended as a basic regression case for each test.
# 
function jest() {
  clear;
  (
    watch=""
    d=$(pwd)
    trap "cd $d" SIGINT SIGTERM EXIT
    arg=""

    cd $(git rev-parse --show-toplevel)
    JEST="./node_modules/jest/bin/jest.js"

    if [[ "$1" = "list" ]]
    then
       shift
       opts=$(find $viewhome/jest -name "*.test.js" | while read name ; do echo $(basename ${name%%.test.js}); done; echo "All"; echo "Quit";)
       num=$(echo $opts | wc -w)
       select opt in $opts; do
           if [[ "$REPLY" = "$num" || "$REPLY" = "q" || "$REPLY" = "Q" || "$REPLY" = "Quit" ]]
           then
              return;
           fi
           let allnum=($num-1)
           if [[ "$REPLY" = $allnum || "$REPLY" = "a" || "$REPLY" = "A" || "$REPLY" = "All" ]]
           then
              break
           fi
           arg="$opt";
           break
       done
    fi

    if [[ "$1" = "--watch" ]]
    then
       watch="$1"
       shift
    fi

    snap=""
    if [[ "$1" = "--updateSnapshot" ]]
    then
       snap="$1"
       shift
    fi

    export testfile=${arg:-$1}
    files=$( ( cd jest && find . -name "${testfile}*" ) | grep '.test.js$')
    arguments=${files:-$1}
    $JEST $watch $snap $arguments
  )
}