update/delete categories now possible

db/files.go

@@ -1,7 +1,7 @@
 package db
 
 /*
-stores the functions related to file IO
+stores the functions related to file IO and category
 */
 import (
 	"log"
@@ -67,9 +67,9 @@ func AddCategory(category string) error {
 	return err
 }
 
-// GetCategoryById will return the ID of that category passed as args
+// GetCategoryByName will return the ID of that category passed as args
 // used while inserting tasks into the table
-func GetCategoryById(category string) int {
+func GetCategoryByName(category string) int {
 	stmt := "select id from category where name=?"
 	rows := database.query(stmt, category)
 	var categoryID int
@@ -82,3 +82,28 @@ func GetCategoryById(category string) int {
 	}
 	return categoryID
 }
+
+//DeleteCategoryByName will be used to delete a category from the category page
+func DeleteCategoryByName(category string) error {
+	//first we delete entries from task and then from category
+	categoryID := GetCategoryByName(category)
+	query := "update task set cat_id = null where id =?"
+	err := taskQuery(query, categoryID)
+	if err == nil {
+		err = taskQuery("delete from category where id=?", categoryID)
+		if err != nil {
+			return err
+		}
+	}
+	return err
+}
+
+//UpdateCategoryByName will be used to delete a category from the category page
+func UpdateCategoryByName(oldName, newName string) error {
+	query := "update category set name = ? where name=?"
+	log.Println(query)
+	err := taskQuery(query, newName, oldName)
+
+	return err
+
+}

db/tasks.go

@@ -176,7 +176,7 @@ func AddTask(title, content, category string, taskPriority int) error {
 	if category == "" {
 		err = taskQuery("insert into task(title, content, priority, created_date, last_modified_at) values(?,?,?,datetime(), datetime())", title, content, taskPriority)
 	} else {
-		categoryID := GetCategoryById(category)
+		categoryID := GetCategoryByName(category)
 		err = taskQuery("insert into task(title, content, priority, created_date, last_modified_at, cat_id) values(?,?,?,datetime(), datetime(), ?)", title, content, taskPriority, categoryID)
 	}
 	return err

main.go

@@ -17,6 +17,8 @@ func main() {
 	views.PopulateTemplates()
 	http.HandleFunc("/", views.ShowAllTasksFunc)
 	http.HandleFunc("/add-category/", views.AddCategoryFunc)
+	http.HandleFunc("/del-category/", views.DeleteCategoryFunc)
+	http.HandleFunc("/upd-category/", views.UpdateCategoryFunc)
 	http.HandleFunc("/category/", views.ShowCategoryFunc)
 	http.HandleFunc("/complete/", views.CompleteTaskFunc)
 	//delete permanently deletes from db

views/addViews.go

@@ -11,6 +11,7 @@ import (
 	"net/http"
 	"os"
 	"strconv"
+	"strings"
 	"text/template"
 	"time"
 
@@ -122,7 +123,7 @@ func AddTaskFunc(w http.ResponseWriter, r *http.Request) {
 func AddCategoryFunc(w http.ResponseWriter, r *http.Request) {
 	r.ParseForm()
 	category := r.Form.Get("category")
-	if category != "" {
+	if strings.Trim(category, " ") != "" {
 		err := db.AddCategory(category)
 		if err != nil {
 			message = "Error adding category"

views/deleteViews.go

@@ -121,3 +121,18 @@ func RestoreFromCompleteFunc(w http.ResponseWriter, r *http.Request) {
 		http.Redirect(w, r, "/completed", http.StatusFound)
 	}
 }
+
+//DeleteCategoryFunc will delete any category
+func DeleteCategoryFunc(w http.ResponseWriter, r *http.Request) {
+	if r.Method == "GET" {
+		categoryName := r.URL.Path[len("/del-category/"):]
+		err := db.DeleteCategoryByName(categoryName)
+		if err != nil {
+			message = "error deleting category"
+		} else {
+			message = "Category " + categoryName + " deleted"
+		}
+
+		http.Redirect(w, r, "/", http.StatusFound)
+	}
+}

views/otherViews.go

@@ -113,3 +113,25 @@ func UpdateTaskFunc(w http.ResponseWriter, r *http.Request) {
 		http.Redirect(w, r, "/", http.StatusFound)
 	}
 }
+
+//UpdateCategoryFunc is used to update a task, handes "/upd-category/" URL
+func UpdateCategoryFunc(w http.ResponseWriter, r *http.Request) {
+	if r.Method == "POST" {
+		var redirectURL string
+		r.ParseForm()
+		oldName := r.URL.Path[len("/upd-category/"):]
+		newName := r.Form.Get("catname")
+
+		err := db.UpdateCategoryByName(oldName, newName)
+		if err != nil {
+			message = "error updating category"
+			log.Println("not updated category " + oldName)
+			redirectURL = "/category/" + oldName
+		} else {
+			message = "cat " + oldName + " -> " + newName
+			redirectURL = "/category/" + newName
+		}
+		log.Println("redirecting to " + redirectURL)
+		http.Redirect(w, r, redirectURL, http.StatusFound)
+	}
+}