From 52fa4d5ae447495ec50036436d1d46cae6c986dc Mon Sep 17 00:00:00 2001
From: Janus Varmarken <varmarken@gmail.com>
Date: Mon, 23 Jul 2018 17:41:27 -0700
Subject: [PATCH] Added script for prepending dates to the timestamp files

---
 Code/Projects/DateWriter/DateWriter.java | 54 ++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 Code/Projects/DateWriter/DateWriter.java

diff --git a/Code/Projects/DateWriter/DateWriter.java b/Code/Projects/DateWriter/DateWriter.java
new file mode 100644
index 0000000..adde143
--- /dev/null
+++ b/Code/Projects/DateWriter/DateWriter.java
@@ -0,0 +1,54 @@
+import java.io.File;
+import java.io.BufferedReader;
+import java.io.FileReader;
+import java.io.PrintWriter;
+import java.time.LocalDate;
+import java.time.LocalTime;
+import java.time.format.DateTimeFormatter;
+import java.io.IOException;
+
+public class DateWriter {
+
+	public static void main(String[] args) throws IOException {
+		if (args.length < 3) {
+			System.out.println("Usage: java /path/to/file/with/timestamps /path/to/new/timestamp/file/with/dates initial_date_in_uuuu-MM-dd_format");
+			System.exit(1);
+		}
+		String pathOriginal = args[0];
+		String pathModified = args[1];
+		String initialDateStr = args[2];
+		LocalDate date = LocalDate.parse(initialDateStr, DateTimeFormatter.ofPattern("uuuu-MM-dd"));
+		File originalFile = new File(pathOriginal);
+		// Create output file
+		File modifiedFile = new File(pathModified);
+		modifiedFile.createNewFile();
+		BufferedReader reader = new BufferedReader(new FileReader(originalFile));
+		PrintWriter writer = new PrintWriter(modifiedFile);
+		String line = null;
+		String prevLine = null;
+		while ((line = reader.readLine()) != null) {
+			if (isNewDay(line, prevLine)) {
+				// Advance date
+				date = date.plusDays(1);
+			}
+			writer.println(String.format("%s %s", date.toString(), line));
+			prevLine = line;
+		}
+		writer.flush();
+		writer.close();
+		reader.close();
+	}
+
+	private static boolean isNewDay(String line, String prevLine) {
+		if (prevLine == null) {
+			return false;
+		}
+		// First part handles case where we pass midnight and the following timestamp is an AM timestamp
+		// Second case handles case where we pass midnight, but the following timestamp is a PM timestamp
+		return line.endsWith("AM") && prevLine.endsWith("PM") || toLocalTime(line).isBefore(toLocalTime(prevLine));
+	}
+
+	private static LocalTime toLocalTime(String timeString) {
+		return LocalTime.parse(timeString, DateTimeFormatter.ofPattern("h:mm:ss a"));
+	}
+}
\ No newline at end of file
-- 
2.34.1