First actual commit

README.md

@@ -1,4 +1,35 @@
-simple-pid
+# simple-pid
-==========
 
-Stupid simple PID management
+Stupid simple PID management.
+
+## Why another PID module?
+
+I know, there’s already quite a few other PID modules out there but for me they
+all seemed to fall into the poorly documented or the overly complex categories.
+I just wanted a way to see if a process was already running and if not, run
+the damn code. I also wanted to do this in a very simple fashion, by way of a
+callback. And thus, I give you `simple-pid`.
+
+## Usage
+
+```javascript
+var pid = require('simple-pid');
+
+pid.lock('process-name', function() {
+  // All your awesome logic
+});
+```
+
+## But what’s it do?
+
+Great question! All it does is checks to see if a PID file was already created,
+based on the passed process name. If the PID inside of the PID file is still
+active, the callback is not executed. If it isn’t running (or the PID file
+simply doesn't exist) the PID file will be created (with the current PID) and
+the code in the callback will be executed.
+
+## Any gotchas?
+
+You know it! Because this module writes to the `/var/run` directory it requires
+write access to that directory. This is best accomplished by running your script
+as root or by way of `sudo`.

index.js

@@ -0,0 +1,24 @@
+var fs      = require('fs-extra');
+var running = require('running');
+
+module.exports = {
+  lock: function(name, callback) {
+    var filename = '/var/run/' + name + '.pid';
+
+    // Checks if PID file exists
+    if (fs.existsSync(filename)) {
+      // Checks if the PID is still active
+      var pid = fs.readFileSync(filename, 'utf8');
+
+      if (running(pid)) {
+        console.log('PID ' + pid + ' found in ' + filename + ' is running.');
+        process.exit(1);
+      }
+    }
+
+    // Writes the PID
+    fs.writeFileSync(filename, process.pid);
+
+    callback && callback();
+  }
+};

package.json

@@ -0,0 +1,28 @@
+{
+  "name": "simple-pid",
+  "version": "1.0.0",
+  "description": "Stupid simple PID management",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/fetchlogic/simple-pid.git"
+  },
+  "keywords": [
+    "pid",
+    "process",
+    "management"
+  ],
+  "author": "Josh Sherman (http://joshtronic.com/)",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/fetchlogic/simple-pid/issues"
+  },
+  "homepage": "https://github.com/fetchlogic/simple-pid",
+  "dependencies": {
+    "fs-extra": "^0.12.0",
+    "running": "0.0.1"
+  }
+}