Adds linear issue title to your prompt in p10k theme + omz (tested only on mac)

prompt_linear_issue.p10k.zsh

function prompt_linear_issue() {
    if git rev-parse --git-dir > /dev/null 2>&1; then
      local git_root=$(git rev-parse --show-toplevel)
      local id=$(git rev-parse --abbrev-ref HEAD)
      local cache_file="$git_root/.git/issue_title_cache_$id" # cache file unique to each branch

      # fetch current time & file mod time
      local current_time=$(date +%s)
      local file_mod_time=$(date -r "$cache_file" +%s 2>/dev/null || echo 0)

      # check if cache file exists and is less than an hour old
      if [[ -f "$cache_file" ]] && (( current_time - file_mod_time < 3600 )); then
        local issue_name=$(<"$cache_file")
      else
        local id=$(git rev-parse --abbrev-ref HEAD)

        if [[ "$id" =~ ^[a-zA-Z]+-[0-9]+$ ]]; then
          local issue_name=$(curl -s -H "Authorization: <personal_api_key>" -H "Content-Type: application/json" \
            -X POST -d '{"query": "query { issue(id: \"'$id'\") { title } }"}' \
            https://api.linear.app/graphql | jq -r '.data.issue.title')
       
          # cache the issue name
          echo "$issue_name" > "$cache_file"
        else
          return 0
        fi
      fi
      
      if [[ -n "$issue_name" ]]; then
        p10k segment -f 183 -i '✸' -t "$issue_name"
      fi
    fi
  }