Shell scripts

make-launch-agent.sh

#!/usr/bin/env nix
#! nix shell nixpkgs#argc nixpkgs#jq --command bash
# shellcheck shell=bash
# vim: filetype=bash
# @describe Bootstrap a launch agent plist
# @option -c --command!  Command to run
# @option -C --cwd <DIR> Working directory
# @option -e --env*,     Environment variables
# @option -l --label!    Launch agent label
# @option -n --name!      Program name

set -euo pipefail

eval "$(argc --argc-eval "$0" "$@")"

shell=${ nix eval --raw 'nixpkgs#runtimeShell';}

readonly \
  cmd="${argc_command:-}" \
  label="${argc_label:-}" \
  name="${argc_name}" \
  shell

readonly log_dir="${HOME}/Library/Logs/${name}"

mkdir -p "$log_dir"

declare -Ar config=(
  [cmd]="${cmd}"
  [Label]="${label}"
  [name]="${name}"
  [Program]="${shell}"
  [StandardErrorPath]="${log_dir}/error.log"
  [StandardOutPath]="${log_dir}/output.log"
  [WorkingDirectory]="${argc_cwd:-${HOME}}"
)

declare -a jq_args=(--null-input)

for key in "${!config[@]}"; do
  value="${config[${key}]}"
  jq_args+=(--arg "${key}" "${value}")
done

if [[ -v argc_env && ${#argc_env} -gt 0 ]]; then
  env_arg=${
    jq --args --null-input --raw-output \
      '$ARGS.positional | map(capture("^(?<key>[^=]+)=(?<value>.+)$")) | from_entries' \
      "${argc_env[@]}"
  }

  jq_args+=(--argjson EnvironmentVariables "${env_arg}")
fi

readonly jq_args plist="${HOME}/Library/LaunchAgents/${label}.plist"

jq "${jq_args[@]}" '$ARGS.named + {
  ProgramArguments: [
    $name,
    "-l",
    "-c",
    "exec \($cmd)"
  ],
  RunAtLoad:         true,
  KeepAlive:         true,
  ThrottleInterval:  10,
  ProcessType:       "Background",
} | del(.cmd, .name)' | plutil -convert xml1 -o "${plist}" -

plutil -lint "${plist}" >&-

domain="gui/${UID}"
readonly domain target="${domain}/${label}"

launchctl bootout "${target}" 2>&- || :
sleep 3
launchctl bootstrap "${domain}" "${plist}"

launchctl print "${target}" | grep -E '^\s*(state|last exit code|program) =' || :

spinner.sh

#!/usr/bin/env bash

spinner() {
  local pid="$1" message="${2:-Loading…}" delay="${3:-0.1}"
  local -a frames=(⠋ ⠙ ⠹ '⠸' ⠼ ⠴ ⠦ ⠧ '⠇' ⠏)
  local -i i=0

  # Hide cursor
  tput civis 2>&-

  while kill -0 "$pid" 2>/dev/null; do
    printf "\r%s ${message}" "${frames[i]}"
    ((i = (i + 1) % ${#frames[@]}))
    sleep "$delay"
  done

  # Clear line and restore cursor
  printf "\r\033[K"
  tput cnorm 2>/dev/null
}