jj-watch

jj-watch.sh

#!/usr/bin/env bash
# Refresh jj log whenever the latest Jujutsu operation changes.
#
# JJ_LOG_WATCH_INTERVAL to change the polling interval (default: 0.5 seconds).

set -u

interval="${JJ_LOG_WATCH_INTERVAL:-0.5}"

latest_operation() {
  # Keep the watcher from snapshotting the working copy and
  # accidentally creating an operation of its own.
  jj --at-op=@ --ignore-working-copy operation log --limit 1 --no-graph --template 'id'
}

render_log() {
  # Clear the terminal and position the cursor at its top-left corner.
    clear && jj st && echo && jj log
}

previous_operation="$(latest_operation)" || {
  echo "Unable to read the latest Jujutsu operation." >&2
  exit 1
}

render_log

while sleep "$interval"; do
  current_operation="$(latest_operation)" || continue

  if [[ "$current_operation" != "$previous_operation" ]]; then
    previous_operation="$current_operation"
    render_log
  fi
done