initial commit

saveGmailAsEml.gs

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+function saveGmailAsEml(){
+  // Set the 'filter' variable to the Gmail-syntaxed search criteria for the target messages.
+  var filter = "-has:attachment in:inbox -has:label to:me older_than:21d after:2017/01/01"; 
+
+  // Set the 'start' variable to the integer for the index of the item to which the script shall apply.
+  // Index '0' starts the script at the first result.
+  var start = 0;
+
+  // Set the 'max' variable to the integer for the maximum number of results to which the script shall apply.
+  var max = 10;
+
+  // DO NOT ALTER. This sets the 'threads' variable to be the return of running GmailApp's 'search' method
+  // using the 'filter', 'start', and 'max' parameters you set above. 
+  var threads = GmailApp.search(filter,start,max);
+	for(i in threads){
+      // The return of 'threads' is the array 'i', for each item of which the script shall apply the sub-function
+      // 'messages', which yields the return of running GmailApp's 'getMessages()' method on 'i'.
+		var messages = threads[i].getMessages();
+		for(j in messages){
+          // The return of 'messages' is the array 'j' for each item of which the script shall perform two methods:
+          // first, GmailApp's 'getId()' method to retrieve the Message-ID (held in the variable 'id');
+			var id = messages[j].getId();
+          // second, GmailApp's 'getRawContent()' method to retrieve the rfc822-standardized message content (held
+          // in the variable 'rawContent').
+			var rawContent = messages[j].getRawContent();
+          // Finally, using DriveApp's 'createFile' method, the script compiles the rfc822-content ('rawContent')
+          // and assigns a file name based on the Message-ID with the .eml extension ('id' + '.eml').
+			DriveApp.createFile(id + '.eml', rawContent, 'message/rfc822');
+		}
+	}
+}