Storing DIffs now...might not be compatible?

Former-commit-id: ce50508705b9727b310059116a2c07d2154d7a80 [formerly 5a63af13359b5a8a3d963c014517c709151312cc] [formerly 0703fe06fc408947ca4d70b97cba99e02c75879f [formerly 965989530c]]
Former-commit-id: 9575b9b87113bd6a2ff0186464671666bbac18cf [formerly f825477fd790918e8d9247e3a540da391dbc687a]
Former-commit-id: 0c1e92517cc0e5ad864135711535021b4c170f19

db.go

@@ -7,6 +7,7 @@ import (
 	"time"
 
 	"github.com/boltdb/bolt"
+	"github.com/sergi/go-diff/diffmatchpatch"
 )
 
 var db *bolt.DB
@@ -33,11 +34,13 @@ func Close() {
 
 // Data for storing in DB
 type CowyoData struct {
-	Title string
-	Text  string
+	Title       string
+	CurrentText string
+	Diffs       []string
+	Timestamps  []string
 }
 
-func (p *CowyoData) load() error {
+func (p *CowyoData) load(title string) error {
 	if !open {
 		return fmt.Errorf("db must be opened before saving!")
 	}
@@ -47,9 +50,14 @@ func (p *CowyoData) load() error {
 		if b == nil {
 			return nil
 		}
-		k := []byte(p.Title)
+		k := []byte(title)
 		val := b.Get(k)
 		if val == nil {
+			// make new one
+			p.Title = title
+			p.CurrentText = ""
+			p.Diffs = []string{}
+			p.Timestamps = []string{}
 			return nil
 		}
 		err = p.decode(val)
@@ -65,7 +73,7 @@ func (p *CowyoData) load() error {
 	return nil
 }
 
-func (p *CowyoData) save() error {
+func (p *CowyoData) save(newText string) error {
 	if !open {
 		return fmt.Errorf("db must be opened before saving")
 	}
@@ -74,6 +82,13 @@ func (p *CowyoData) save() error {
 		if err != nil {
 			return fmt.Errorf("create bucket: %s", err)
 		}
+		// find diffs
+		dmp := diffmatchpatch.New()
+		diffs := dmp.DiffMain(p.CurrentText, newText, true)
+		delta := dmp.DiffToDelta(diffs)
+		p.CurrentText = newText
+		p.Timestamps = append(p.Timestamps, time.Now().String())
+		p.Diffs = append(p.Diffs, delta)
 		enc, err := p.encode()
 		if err != nil {
 			return fmt.Errorf("could not encode CowyoData: %s", err)

main.go

@@ -55,10 +55,14 @@ Options:`)
 	defer Close()
 
 	// Default page
-	p := CowyoData{"about", about_page}
-	p.save()
+	p := CowyoData{"about", about_page, []string{}, []string{}}
+	p.save(about_page)
 	fmt.Println(about_page)
 
+	var q CowyoData
+	q.load("SpikySeaSlug")
+	rebuildTexts(q)
+
 	r := gin.Default()
 	r.LoadHTMLGlob("templates/*")
 	r.GET("/", newNote)

routes.go

@@ -56,12 +56,12 @@ func serveStaticFile(c *gin.Context, option string) {
 }
 
 func renderMarkdown(c *gin.Context, title string) {
-	p := CowyoData{strings.ToLower(title), ""}
-	err := p.load()
+	var p CowyoData
+	err := p.load(strings.ToLower(title))
 	if err != nil {
 		panic(err)
 	}
-	unsafe := blackfriday.MarkdownCommon([]byte(p.Text))
+	unsafe := blackfriday.MarkdownCommon([]byte(p.CurrentText))
 	html := bluemonday.UGCPolicy().SanitizeBytes(unsafe)
 	html2 := string(html)
 
@@ -126,13 +126,13 @@ func renderList(c *gin.Context, title string) {
 	if strings.ToLower(title) == "about" { //}&& strings.Contains(AllowedIPs, c.ClientIP()) != true {
 		c.Redirect(302, "/about/view")
 	}
-	p := CowyoData{strings.ToLower(title), ""}
-	err := p.load()
+	var p CowyoData
+	err := p.load(strings.ToLower(title))
 	if err != nil {
 		panic(err)
 	}
 
-	listItems, _ := reorderList(p.Text)
+	listItems, _ := reorderList(p.CurrentText)
 
 	c.HTML(http.StatusOK, "list.tmpl", gin.H{
 		"Title":     title,
@@ -144,25 +144,25 @@ func deleteListItem(c *gin.Context) {
 	lineNum, err := strconv.Atoi(c.DefaultQuery("lineNum", "None"))
 	title := c.Query("title") // shortcut for c.Request.URL.Query().Get("lastname")
 	if err == nil {
-		p := CowyoData{strings.ToLower(title), ""}
-		err := p.load()
+		var p CowyoData
+		err := p.load(strings.ToLower(title))
 		if err != nil {
 			panic(err)
 		}
 
-		_, listItems := reorderList(p.Text)
-
+		_, listItems := reorderList(p.CurrentText)
+		newText := p.CurrentText
 		for i, lineString := range listItems {
 			// fmt.Println(i, lineString, lineNum)
 			if i+1 == lineNum {
 				// fmt.Println("MATCHED")
 				if strings.Contains(lineString, "~~") == false {
 					// fmt.Println(p.Text, "("+lineString[2:]+"\n"+")", "~~"+lineString[2:]+"~~"+"\n")
-					p.Text = strings.Replace(p.Text+"\n", lineString[2:]+"\n", "~~"+lineString[2:]+"~~"+"\n", 1)
+					newText = strings.Replace(newText+"\n", lineString[2:]+"\n", "~~"+lineString[2:]+"~~"+"\n", 1)
 				} else {
-					p.Text = strings.Replace(p.Text+"\n", lineString[2:]+"\n", lineString[4:len(lineString)-2]+"\n", 1)
+					newText = strings.Replace(newText+"\n", lineString[2:]+"\n", lineString[4:len(lineString)-2]+"\n", 1)
 				}
-				p.save()
+				p.save(newText)
 				break
 			}
 		}

utils.go

@@ -1,9 +1,12 @@
 package main
 
 import (
+	"fmt"
 	"math/rand"
 	"strings"
 	"time"
+
+	"github.com/sergi/go-diff/diffmatchpatch"
 )
 
 var animals []string
@@ -30,7 +33,7 @@ Be cautious about writing sensitive information in the notes as anyone with the
 
 Have fun.
 
-**Powered by Raspberry Pi 2** ![jk](http://kodi.tv/wp-content/uploads/DL_Icons_RaspberryPi-new.png)`
+**Powered by Raspberry Pi and Go** ![Raspberry Pi](/static/img/raspberrypi.png) ![Go Mascot](/static/img/gomascot.png)`
 
 }
 
@@ -70,3 +73,28 @@ func contentType(filename string) string {
 }
 
 var about_page string
+
+func diffRebuildtexts(diffs []diffmatchpatch.Diff) []string {
+	text := []string{"", ""}
+	for _, myDiff := range diffs {
+		if myDiff.Type != diffmatchpatch.DiffInsert {
+			text[0] += myDiff.Text
+		}
+		if myDiff.Type != diffmatchpatch.DiffDelete {
+			text[1] += myDiff.Text
+		}
+	}
+	return text
+}
+
+func rebuildTexts(p CowyoData) {
+	dmp := diffmatchpatch.New()
+	current := ""
+	for i, diff := range p.Diffs {
+		seq1, _ := dmp.DiffFromDelta(current, diff)
+		texts_linemode := diffRebuildtexts(seq1)
+		rebuilt := texts_linemode[len(texts_linemode)-1]
+		fmt.Println(i, p.Timestamps[i], rebuilt)
+		current = rebuilt
+	}
+}

websockets.go

@@ -4,7 +4,6 @@ import (
 	"encoding/json"
 	"fmt"
 	"net/http"
-	"strings"
 
 	"github.com/gorilla/websocket"
 )
@@ -40,21 +39,24 @@ func wshandler(w http.ResponseWriter, r *http.Request) {
 			panic(err)
 		}
 
+		var p CowyoData
+		err = p.load(m.Title)
+		fmt.Println("LOADED")
+		fmt.Println(p)
+		if err != nil {
+			panic(err)
+		}
 		if m.UpdateServer {
-			p := CowyoData{strings.ToLower(m.Title), m.TextData}
-			err := p.save()
+			err := p.save(m.TextData)
+			fmt.Println("SAVED")
+			fmt.Println(p)
 			if err != nil {
 				panic(err)
 			}
 		}
 		if m.UpdateClient {
-			p := CowyoData{strings.ToLower(m.Title), ""}
-			err := p.load()
-			if err != nil {
-				panic(err)
-			}
-			m.UpdateClient = len(m.TextData) != len(p.Text)
-			m.TextData = p.Text
+			m.UpdateClient = len(m.TextData) != len(p.CurrentText)
+			m.TextData = p.CurrentText
 		}
 		newMsg, err := json.Marshal(m)
 		if err != nil {