Add parsing users in text

pkg/models/mentions.go

@@ -0,0 +1,39 @@
+// Vikunja is a to-do list application to facilitate your life.
+// Copyright 2018-2021 Vikunja and contributors. All rights reserved.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public Licensee as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public Licensee for more details.
+//
+// You should have received a copy of the GNU Affero General Public Licensee
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package models
+
+import (
+	"code.vikunja.io/api/pkg/user"
+	"regexp"
+	"strings"
+	"xorm.io/xorm"
+)
+
+func FindMentionedUsersInText(s *xorm.Session, text string) (users []*user.User, err error) {
+	reg := regexp.MustCompile(`@\w+`)
+	matches := reg.FindAllString(text, -1)
+	if matches == nil {
+		return
+	}
+
+	usernames := []string{}
+	for _, match := range matches {
+		usernames = append(usernames, strings.TrimPrefix(match, "@"))
+	}
+
+	return user.GetUsersByUsername(s, usernames, true)
+}

pkg/models/mentions_test.go

@@ -0,0 +1,87 @@
+// Vikunja is a to-do list application to facilitate your life.
+// Copyright 2018-2021 Vikunja and contributors. All rights reserved.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public Licensee as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Affero General Public Licensee for more details.
+//
+// You should have received a copy of the GNU Affero General Public Licensee
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+package models
+
+import (
+	"code.vikunja.io/api/pkg/db"
+	"code.vikunja.io/api/pkg/user"
+	"testing"
+)
+
+func TestFindMentionedUsersInText(t *testing.T) {
+	user1 := &user.User{
+		ID: 1,
+	}
+	user2 := &user.User{
+		ID: 2,
+	}
+
+	tests := []struct {
+		name      string
+		text      string
+		wantUsers []*user.User
+		wantErr   bool
+	}{
+		{
+			name: "no users mentioned",
+			text: "Lorem Ipsum dolor sit amet",
+		},
+		{
+			name:      "one user at the beginning",
+			text:      "@user1 Lorem Ipsum",
+			wantUsers: []*user.User{user1},
+		},
+		{
+			name:      "one user at the end",
+			text:      "Lorem Ipsum @user1",
+			wantUsers: []*user.User{user1},
+		},
+		{
+			name:      "one user in the middle",
+			text:      "Lorem @user1 Ipsum",
+			wantUsers: []*user.User{user1},
+		},
+		{
+			name:      "same user multiple times",
+			text:      "Lorem @user1 Ipsum @user1 @user1",
+			wantUsers: []*user.User{user1},
+		},
+		{
+			name:      "Multiple users",
+			text:      "Lorem @user1 Ipsum @user2",
+			wantUsers: []*user.User{user1, user2},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			db.LoadAndAssertFixtures(t)
+			s := db.NewSession()
+			defer s.Close()
+
+			gotUsers, err := FindMentionedUsersInText(s, tt.text)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("FindMentionedUsersInText() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			for i, u := range gotUsers {
+				if u.ID != tt.wantUsers[i].ID {
+					t.Errorf("wanted user %d, got %d at position %d", tt.wantUsers[i].ID, u.ID, i)
+				}
+			}
+		})
+	}
+}

pkg/user/user.go

@@ -197,6 +197,27 @@ func GetUserByUsername(s *xorm.Session, username string) (user *User, err error)
 	return getUser(s, &User{Username: username}, false)
 }
 
+// GetUsersByUsername returns a slice of users with the provided usernames
+func GetUsersByUsername(s *xorm.Session, usernames []string, withEmails bool) (users []*User, err error) {
+	if len(usernames) == 0 {
+		return
+	}
+
+	users = []*User{}
+	err = s.In("username", usernames).Find(&users)
+	if err != nil {
+		return
+	}
+
+	if !withEmails {
+		for _, u := range users {
+			u.Email = ""
+		}
+	}
+
+	return
+}
+
 // GetUserWithEmail returns a user object with email
 func GetUserWithEmail(s *xorm.Session, user *User) (userOut *User, err error) {
 	return getUser(s, user, true)