Add node modules and new code for release (#39)

Co-authored-by: tbarnes94 <tbarnes94@users.noreply.github.com>

node_modules/sane/src/watchexec_client.js

@@ -0,0 +1,63 @@
+/*
+   This file is the executable run by watchexec
+   when a change is detected.
+
+   It will extract changes from the environment variables
+   set by watchexec and write to stdout in a format
+   readable by the file `../watchexec_watcher.js`.
+*/
+'use strict';
+
+const { EOL } = require('os');
+
+function withPrefixes(prefixes) {
+  return function withPrefix(arr, i) {
+    return arr.map(str => {
+      return `${prefixes[i]} ${str}`;
+    });
+  };
+}
+
+let allPrefixes = ['write', 'rename', 'remove', 'create'];
+
+function extractChanges(context) {
+  const {
+    WATCHEXEC_COMMON_PATH,
+    WATCHEXEC_WRITTEN_PATH,
+    WATCHEXEC_RENAMED_PATH,
+    WATCHEXEC_REMOVED_PATH,
+    WATCHEXEC_CREATED_PATH,
+  } = context;
+
+  let events = [
+    WATCHEXEC_WRITTEN_PATH,
+    WATCHEXEC_RENAMED_PATH,
+    WATCHEXEC_REMOVED_PATH,
+    WATCHEXEC_CREATED_PATH,
+  ];
+
+  let currentPrefixes = events
+    .map((l, i) => l && allPrefixes[i])
+    .filter(Boolean);
+
+  function toFullPath(arr) {
+    return arr.map(path => (WATCHEXEC_COMMON_PATH || '') + path);
+  }
+
+  let message = events
+    .filter(Boolean)
+    .map(str => str.split(':'))
+    .map(toFullPath)
+    .map(withPrefixes(currentPrefixes))
+    .reduce((e, memo) => memo.concat(e), [])
+    .join(EOL);
+
+  return message;
+}
+
+if (require.main === module) {
+  let message = extractChanges(process.env);
+  console.log(message);
+}
+
+module.exports = extractChanges;