`jest` runner for multiple disparate ts[x] files

dev-watch-select.sh

#!/usr/bin/env bash

script_name="${0##*/}"

# By default `fzf` uses `find`, try using one of the options listed here
# https://github.com/junegunn/fzf#tips to ignore .gitignore files
check_fzf_default_command() {
  if [ -x "$(command -v gfind)" ]; then
    export FZF_DEFAULT_COMMAND='gfind . -path "*__tests__*" -iname "*.ts" -o -path "*__tests__*" -iname "*.tsx"'
  else
    export FZF_DEFAULT_COMMAND='find . -path "*__tests__*" -iname "*.ts" -o -path "*__tests__*" -iname "*.tsx"'
  fi
}

fzf_preview_command="head -n 500 {}"
if [ -x "$(command -v bat)" ]; then
  fzf_preview_command="bat --style=numbers --color=always {}"
fi

fzf_header="select test file(s):"
while [[ "$#" -gt 0 ]]; do
  case $1 in
    -h | --help)
      echo "usage: $script_name /path/to/test/file1 /path/to/test/file2 ... /path/to/test/filen"
      echo "usage: $script_name <use fzf to select files>"
      exit 0
      ;;
    -s | --staged)
      test_files="$(git diff --name-only --cached | grep -E "\.test\.(ts|tsx)$")"
      if [ "${#test_files[@]}" -eq 0 ]; then
        echo "WARNING: No staged test files found, launching interactive file selection"
      fi
      shift
      ;;
    --keys)
      fzf_header=$(
        cat << EOF
keybindings:
 <tab>   select             ctrl-u  clear query           ?  toggle preview
 ctrl-a  select all         ctrl-b  page up          ctrl-p  preview half page up
 ctrl-d  deselect all       ctrl-f  page down        ctrl-n  preview half page down
 ctrl-t  toggle selection
EOF
      )
      shift
      ;;
    *)
      test_files=("$@")
      shift
      ;;
  esac
done

fzf_select_opts="\
  --ansi \
  --multi \
  --reverse \
  --height=65% \
  --inline-info \
  --bind=?:toggle-preview \
  --bind=ctrl-a:select-all \
  --bind=ctrl-b:page-up \
  --bind=ctrl-d:deselect-all \
  --bind=ctrl-f:page-down \
  --bind=ctrl-n:preview-half-page-down \
  --bind=ctrl-p:preview-half-page-up \
  --bind=ctrl-t:toggle-all\
  --bind=ctrl-u:clear-query \
  --header=\"$fzf_header\" \
  --preview=\"$fzf_preview_command\" \
  --preview-window=bottom:60% \
"

if [ "${#test_files[@]}" -eq 0 ]; then
  if [ -x "$(command -v fzf)" ]; then
    check_fzf_default_command
    while IFS='' read -r line; do test_files+=("$line"); done < <(eval "fzf $fzf_select_opts")
    if [ "${#test_files[@]}" -eq 0 ]; then
      exit 0
    fi
  else
    echo "INFO: For an interactive file selection filtering install 'brew install fzf'"
    exit 1
  fi
fi

if [ "${#test_files[@]}" -ge 0 ]; then
  npx jest --collectCoverage=false --watch --verbose=false "${test_files[@]}"

  # history depends on shell, show command so you can copy and paste so it can persist
  echo "test command:"
  echo "npx jest --collectCoverage=false --watch --verbose=false \\"

  # print all files on separate lines except the last one
  for file in "${test_files[@]::${#test_files[@]}-1}"; do
    echo "  ${file} \\"
  done
  echo "  ${test_files[-1]}"
fi