Workspace Listener for Linux & macOS 🐧

Depending on demand, because macOS  is BSD Unix under the hood, I hope creating a Workspace listener also for macOS will be possible, Do we need a separate idea for this to check demand?

No, if votes keep on coming in we’ll make sure to cover both macOS and Linux!

Edit: have updated the title accordingly.

​@Marius Korff as a MacOS user, I made a - no guarentee - little listener that monitors the choosen directory and opens in my case VS Code. 

First install a directory watcher: brew install fswatch

Next create a little script: /usr/local/bin/TwFileWatcher.sh 

#!/usr/bin/env bash
set -euo pipefail

# ---- config ----
root="/Users/<UserName>/<API Folder>"
cooldown_seconds=2

# Validate tool locations
if [[ -x "/usr/local/bin/brew" ]]; then
  brew_bin="/usr/local/bin/brew"
  fswatch_bin="/usr/local/bin/fswatch"
else
  echo "brew not found at /usr/local/bin/brew"
  exit 1
fi

# prefer vscode cli if present; fallback to open -a
if [[ -x "/usr/local/bin/code" ]]; then
  code_bin="/usr/local/bin/code"
else
  code_bin=""
fi

# last-open time per file
state="${TMPDIR:-/tmp}/tw_last_opened.tsv"
touch "$state"

should_open() {
  local path="$1"
  local now last

  now=$(date +%s)
  last=$(awk -v p="$path" '$1==p{print $2}' "$state" | tail -n 1)
  last=${last:-0}

  # cooldown prevents reopen when you save in vscode
  if (( now - last < cooldown_seconds )); then
    return 1
  fi

  return 0
}

mark_opened() {
  local path="$1"
  local now
  now=$(date +%s)
  printf "%s\t%s\n" "$path" "$now" >> "$state"
}

"$brew_bin" list fswatch >/dev/null 2>&1 || { echo "install fswatch: brew install fswatch"; exit 1; }
[[ -x "$fswatch_bin" ]] || { echo "fswatch not found at $fswatch_bin"; exit 1; }

"$fswatch_bin" -0 -r \
  --event Updated \
  --event Created \
  --exclude '.*' \
  --include '.*\.sql$' \
  "$root" | while IFS= read -r -d '' path; do

    [[ -f "$path" ]] || continue
    sleep 0.2

    if should_open "$path"; then
      if [[ -n "$code_bin" ]]; then
        "$code_bin" -g "${path}:1:1" >/dev/null 2>&1 &
      else
        open -a "Visual Studio Code" "$path" >/dev/null 2>&1 &
      fi
      mark_opened "$path"
    fi
  done

Next (afer testing ofcourse) add a laucher: 

/Users/<UserName>/Library/LaunchAgents/com.lef.twfilewatcher.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
  <dict>
    <key>Label</key>
    <string>com.lef.twfilewatcher</string>

    <key>ProgramArguments</key>
    <array>
      <string>/usr/local/bin/TwFileWatcher.sh</string>
    </array>

    <key>RunAtLoad</key>
    <true/>

    <key>KeepAlive</key>
    <true/>

    <key>StandardOutPath</key>
    <string>/tmp/twfilewatcher.out</string>

    <key>StandardErrorPath</key>
    <string>/tmp/twfilewatcher.err</string>
  </dict>
</plist>

Load it: launchctl load -w /Users/<UserName>/Library/LaunchAgents/com.lef.twfilewatcher.plist

For me this opens all .sql files added or updated in the API folder of choice to be opened in VS code. 

Hope this helps :) 

That said, I hope there will come an official one some day.