From 4cfd4fbd28eeb949ac6b808157a9579b2612e8d2 Mon Sep 17 00:00:00 2001
From: Adam R Grey <git@adamrgrey.com>
Date: Thu, 3 Feb 2022 12:41:53 -0500
Subject: [PATCH] flags

---
 heatmap.go | 39 ++++++++++++++++++++++++++++++++++-----
 1 file changed, 34 insertions(+), 5 deletions(-)

diff --git a/heatmap.go b/heatmap.go
index 2447181..fa91fed 100644
--- a/heatmap.go
+++ b/heatmap.go
@@ -3,6 +3,7 @@ package main
 import (
 	"bufio"
 	"encoding/csv"
+	"flag"
 	"fmt"
 	"io"
 	"io/ioutil"
@@ -18,7 +19,37 @@ type ActivityLine struct {
 }
 
 func main() {
-	csvFile, _ := os.Open("heat.csv")
+	var csvPathArg string
+	var endDateArg string
+	var startDateArg string
+	var outputPath string
+	flag.StringVar(&csvPathArg, "csv", "heat.csv", "Specify csv path, default is heat.csv.")
+	flag.StringVar(&outputPath, "o", "heatmap.svg", "Specify output path, default is heatmeap.svg.")
+	flag.StringVar(&startDateArg, "s", "", "Specify start date (2006-01-02). Default is 1 year previous to end date.")
+	flag.StringVar(&endDateArg, "e", "", "Specify end date (2006-01-02). Default is today.")
+
+	flag.Parse()
+
+	endDate := time.Date(time.Now().Year(), time.Now().Month(), time.Now().Day(), 0, 0, 0, 0, time.Local)
+	if endDateArg != "" {
+		var err error
+		endDate, err = time.Parse("2006-01-02", endDateArg)
+		if err != nil {
+			fmt.Println("failed to parse end time")
+			return
+		}
+	}
+	start := time.Date(endDate.Year()-1, endDate.Month(), endDate.Day(), 0, 0, 0, 0, time.Local)
+	if startDateArg != "" {
+		var err error
+		start, err = time.Parse("2006-01-02", startDateArg)
+		if err != nil {
+			fmt.Println("failed to parse start time")
+			return
+		}
+	}
+
+	csvFile, _ := os.Open(csvPathArg)
 	reader := csv.NewReader(bufio.NewReader(csvFile))
 	var length int = 17
 	var days = make(map[time.Time]uint64)
@@ -42,11 +73,9 @@ func main() {
 
 		days[thisTime] = days[thisTime] + cals
 	}
-	start := time.Date(time.Now().Year()-1, time.Now().Month(), time.Now().Day(), 0, 0, 0, 0, time.Local)
 	svg := "<svg width=\"960\" height=\"152\"><g transform=\"translate(29.5,24)\"><g fill=\"none\" stroke=\"#ccc\">"
 	datePointer := start
 	var week int = 0
-	midnightThisMorning := time.Date(time.Now().Year(), time.Now().Month(), time.Now().Day(), 0, 0, 0, 0, time.Local)
 
 	var monthChange = false
 	var monthLabelSpots = make(map[string]int)
@@ -61,7 +90,7 @@ func main() {
 		}
 		datePointer = datePointer.Add(time.Hour * 24)
 
-		if datePointer.After(midnightThisMorning) {
+		if datePointer.After(endDate) {
 			break
 		}
 		if datePointer.Day() == 1 {
@@ -89,5 +118,5 @@ func main() {
 	svg = fmt.Sprintf("%s</g>", svg)
 
 	svg = fmt.Sprintf("%s</svg>", svg)
-	ioutil.WriteFile("heatmap.svg", []byte(svg), 0644)
+	ioutil.WriteFile(outputPath, []byte(svg), 0644)
 }