Bash command to nicely select a jira ticket to work on (optimized for a certain former project)

jira-branch.bash

jira-branch() (
  set -eo pipefail

  local jira_instance jq_template query username api_key ticket_id jira_title commit_title
  username="$JIRA_USERNAME"
  api_key="$JIRA_API_KEY"
  jira_instance="$JIRA_INSTANCE"

  query="project=MAIN AND statusCategory!=Done AND assignee=currentUser()"

  jq_template='"'\
'\(.key). \(.fields.summary) [\(.fields.issuetype.name)]'\
'\t'\
'Reporter: \(.fields.reporter.displayName)\n'\
'Created: \(.fields.created)\n'\
'Updated: \(.fields.updated)\n\n'\
'\(.fields.description)'\
'"'

  jira_title=$(
    curl --silent --compressed \
      -H "Content-Type: application/json" \
      --user "$username:$api_key" \
      --data-urlencode "jql=$query" \
      --get \
      "https://$jira_instance/rest/api/2/search" |
    jq ".issues[] | $jq_template" |
    sed -e 's/"\(.*\)"/\1/' -e 's/\\t/\t/' |
    fzf \
      --with-nth=1 \
      --delimiter='\t' \
      --preview='echo -e {2}' \
      --preview-window=top:wrap |
    cut -f1
  )

  if [ -n "$jira_title" ]; then
    declare -A issuetype_to_branchtype=( ["Story"]="feature" ["Task"]="enhancement" ["Bug"]="bugfix" )

    ticket_id=$(echo "$jira_title" | perl -pE 's/\. .+//')
    ticket_title=$(echo -e "$jira_title" | perl -pE 's/^\S+\. //; s/ \[\w+\]$//')
    ticket_type=$(echo -e "$jira_title" | perl -pE 's/.+\[(\w+)\]$/\1/')
    branch_type=$(case $ticket_type in
      (Story) echo "feature";;
      (Task) echo "enhancement";;
      (Bug) echo "bugfix";;
      (*) echo "feature";;
    esac)
    commit_title="$ticket_id $ticket_title"
    branch_name="$branch_type""/""$ticket_id""/"$(echo "$commit_title" | perl -pE 's/^[A-Z]+-\d+//; s/[^0-9a-zA-Z]+/-/g; s/(^-|-$)//g; s/[A-Z]/\L$&/g')

    main_branch=$(git branch -rl '*/HEAD' | rev | cut -d/ -f1 | rev)

    git fetch --force origin "$main_branch":"$main_branch" --update-head-ok

    git branch -D "$branch_name" &>/dev/null || true
    git checkout -b "$branch_name" "$main_branch"
    git commit --allow-empty -m "$(printf "%s\n\n%s" "$commit_title" "https://$jira_instance/browse/$ticket_id")"

    curl --silent --compressed \
      -H "Content-Type: application/json" \
      --user "$username:$api_key" \
      -d '{"transition": {"id": "321"}}' \
      "https://$jira_instance/rest/api/2/issue/$ticket_id/transitions"
  fi
)